Podcasts about vesicles

It's In the News! A look at the top diabetes stories and headlines happening now. Top stories this week: A weekly basal plus semaglutide is in the works, but not for the US right now, Tandem updates it's app recall, liver targeted insulin study, a weird walking story, and Lance Bass educates about LADA.  Find out more about Moms' Night Out  Please visit our Sponsors & Partners - they help make the show possible! Learn more about Gvoke Glucagon Gvoke HypoPen® (glucagon injection): Glucagon Injection For Very Low Blood Sugar (gvokeglucagon.com) Omnipod - Simplify Life Learn about Dexcom  Edgepark Medical Supplies Check out VIVI Cap to protect your insulin from extreme temperatures Learn more about AG1 from Athletic Greens  Drive research that matters through the T1D Exchange The best way to keep up with Stacey and the show is by signing up for our weekly newsletter: Sign up for our newsletter here Here's where to find us: Facebook (Group) Facebook (Page) Instagram Twitter Check out Stacey's books! Learn more about everything at our home page www.diabetes-connections.com  Reach out with questions or comments: info@diabetes-connections.com Episode transcription with links: Hello and welcome to Diabetes Connections In the News! I'm Stacey Simms and every other Friday I bring you a short episode with the top diabetes stories and headlines happening now. XX Novo Nordisk moves ahead with a new combination: once-weekly insulin icodec and semaglutide. Called IcoSema, Novo plans to submit for approval in Europe, Canada, Japan and Australia but NOT the US. As we told you earlier this summer, icodec – once weeky basal insulin – was not approved by the US FDA. Semaglutide is the molecule underpinning Novo's immensely popular GLP-1 drugs Ozempic and Wegovy. Icodec has been approved as Awiqli in places like Europe, Canada, Japan and Australia but was snubbed by the FDA last month. The FDA has left the door open for another application, but Novo says they don't expect to iron it out this year. In studies, the combination worked well to lower A1C for people with type 2 and they lost weight. They also had fewer lows. https://www.fiercepharma.com/pharma/corrected-after-icodec-rejection-novo-nordisk-wont-file-application-once-weekly-insulin-and   XX An update from Tandm on their app recall. Back in March they notified users of the recall because of an issue that can cause rapid depletion of a user's t:slim X2 insulin pump battery. This battery depletion can result in the pump shutting down sooner than expected, which some customers have continued to experience even after an updated version of the app was released. Notices were emailed to impacted customers on August 9, 2024 with updated information and recommendations for helping avoid pump battery depletion. Tandem plans to release a new version of the app to address the remaining issues and will notify all users by email and app push notifications following its release. Impacted customers in the U.S. with questions about this recall can contact the Tandem Diabetes Care Technical Support Team 24 hours a day, 7 days a week at techsupport@tandemdiabetes.com or (877) 801-6901. https://www.businesswire.com/news/home/20240812040222/en/Tandem-Diabetes-Care-Provides-Update-on-March-2024-Nationwide-Recall-of-tconnect-Mobile-App-for-iOS-Devices XX If you are an adult who has type 1 diabetes, you may be eligible to participate in a trial examining the impact of an investigational liver-targeted insulin on blood glucose control, A1C, and nighttime lows. This study is researching whether administering a liver-targeting insulin called HDV-L insulin (Hepatocyte-directed Vesicles-insulin lispro), will improve glycemic control. HDV-L insulin is designed to act on the liver to enhance glucose storage and decrease the frequency of severe hypoglycemia in individuals requiring insulin. It is not currently approved for use. For this trial, researchers are recruiting roughly 230 adults with type 1 diabetes aged 18-79 who are on multiple daily injections (MDI). This study is recruiting in California, Colorado, Florida, Georgia, Illinois, Indiana, New York, North Carolina, Ohio, and Texas. To enroll or learn more about this study, contact Todd Hobbs, MD at Diasome Pharmaceuticals at thobbs@diasome.com or call 216-780-9324. Clinical Trials Identifier: NCT06238778 https://diatribe.org/diabetes-research/new-study-tests-liver-targeted-insulin-type-1-diabetes XX Sanofi is investing heavily to boost insulin production. They opened a new facility in Germany for the basal insulin Lantus and they announced they will invest over one billion dollars to expand production capacity in France. Sanofi's considerable investment in insulin production is especially important given that other insulin companies appear to be focusing their efforts on production of GLP-1 medications like Mounjaro and Ozempic, rather than insulin. This has left some patients worried that Novo Nordisk and Lilly will leave them behind to pursue more lucrative products for weight loss, especially after Novo Nordisk decided to discontinue the basal insulin Levemir. https://diatribe.org/diabetes-medications/sanofi-build-new-state-art-insulin-plant   XX Hoping to talk to Abbott and Medtronic soon about their partnership announced earlier this month. The companies announced that Abbot will create an integrated continuous glucose monitor that works only with Medtronic's diabetes technology and be sold exclusively by Medtronic. Along with announcing the partnership, Medtronic said Wednesday it received FDA approval for its Simplera CGM, which does not require fingersticks or overtape, unlike the company's previous sensors. The Simplera Sync sensor, which is designed to work with Medtronic's automated insulin delivery algorithm, is under FDA review separately. https://www.medtechdive.com/news/abbott-medtronic-partnership-automated-insulin-delivery/723600/ XX Researchers have developed a novel computer algorithm that can predict various diseases like diabetes or stroke, just by analysing the colour of the human tongue with 98 per cent accuracy. The imaging system developed by Middle Technical University (MTU) and the University of South Australia (UniSA) in Australia can diagnose conditions such as diabetes, stroke, anaemia, asthma, liver and gallbladder issues, Covid-19, and other vascular and gastrointestinal diseases. "The colour, shape, and thickness of the tongue can reveal a litany of health conditions," said Ali Al-Naji, adjunct Associate Professor at MTU and UniSA. The paper published in Technologies describes how the system analyses tongue colour to provide real-time diagnoses, demonstrating that AI can advance medical practices significantly. The breakthrough was achieved through a series of experiments using 5,260 images to train machine-learning algorithms to detect tongue colour. Researchers received 60 tongue images from two teaching hospitals in the Middle East, representing patients with diverse health conditions. The AI model matched tongue colour with the correct disease in nearly all cases. https://www.ndtv.com/world-news/new-algorithm-analyses-tongue-to-predict-diabetes-stroke-with-98-accuracy-6327124 XX Big roundup article from the UK Guardian all about 6 projects all around smart insulin. Not a lot new here, but it caused a lot of chatter. I'll link it up – good summary of all of the research happening in the space right now. Glucose-responsive insulin is the idea that you could give one injection and the insulin would respond to the rise and fall of glucose levels without further action by the person.   https://www.theguardian.com/society/article/2024/aug/11/scientists-hail-smart-insulin-responds-changing-blood-sugar-levels-real-time-diabetes XX Edgepark Commercial XX Lance Bass (like glass) continues to keep the public posted on his recent LADA diagnosis. The boy band singer showing his IG audience more about what's also called diabetes 1.5 and explaining how he was first diagnosed with type 2. XX Ok, brace yourself – I promise this is a real story. The Fart Walk is actually good for you. Ok.. stay with me. This is really just a great silly reframing of something we all know, and I couldn't resist putting it in here. A wellness influencer put this out – you may have seen it – claiming the after dinner stroll can limit your risk of type 2 diabetes. A lot of studies confirm that – along with it having benefits if you already have diabetes. The flatulence part – or a release of gastric pressure – is also a known benefit of moving more after meals. So it's funny, farts are always funny, but if it gets more people to walk after they eat I'm all for it.   https://people.com/fart-walk-benefits-what-is-it-type-2-diabetes-8694630#:~:text=Wellness%20influencer%20Mairlyn%20Smith%20has,of%20day%20you%20do%20it XX Join us again soon!

In a groundbreaking study conducted by researchers in Austria, the focus was on understanding the role of extracellular microRNAs (miRNAs) in lipedema. The research paper titled “SVF-Derived Extracellular Vesicles Carry Characteristic miRNAs in Lipedema” was published in the peer-reviewed journal Scientific Reports in April 2020.

BUFFALO, NY- November 30, 2023 – A new #researchpaper was #published on the #cover of Aging (listed by MEDLINE/PubMed as "Aging (Albany NY)" and "Aging-US" by Web of Science) Volume 15, Issue 22, entitled, “Chronological aging impacts abundance, function and microRNA content of extracellular vesicles produced by human epidermal keratinocytes.” The disturbance of intercellular communication is one of the hallmarks of aging. In their new study, researchers Taku Nedachi, Christelle Bonod, Julie Rorteau, Wafae Chinoune, Yuri Ishiuchi, Sandrine Hughes, Benjamin Gillet, Nicolas Bechetoille, Dominique Sigaudo-Roussel, and Jérôme Lamartine from the University of Lyon, Toyo University and Gattefossé SAS aimed to clarify the impact of chronological aging on extracellular vesicles (EVs), a key mode of communication in mammalian tissues. “The present study was therefore conducted to elucidate whether the characteristics of EVs released from cultured human keratinocytes can be modulated during aging process.” The researchers focused on epidermal keratinocytes, the main cells of the outer protective layer of the skin which is strongly impaired in the skin of elderly. EVs were purified from conditioned medium of primary keratinocytes isolated from infant or aged adult skin. A significant increase of the relative number of EVs released from aged keratinocytes was observed whereas their size distribution was not modified. By small RNA sequencing, the researchers described a specific microRNA (miRNA) signature of aged EVs with an increase abundance of miR-30a, a key regulator of barrier function in human epidermis. EVs from aged keratinocytes were found to be able to reduce the proliferation of young keratinocytes, to impact their organogenesis properties in a reconstructed epidermis model and to slow down the early steps of skin wound healing in mice, three features observed in aged epidermis. This work reveals that intercellular communication mediated by EVs is modulated during aging process in keratinocytes and might be involved in the functional defects observed in aged skin. “To conclude, we have shown here that aging modulates EVs abundance, function and microRNA content in human keratinocytes.” DOI - https://doi.org/10.18632/aging.205245 Corresponding author - Jérôme Lamartine - jerome.lamartine@univ-lyon1.fr Sign up for free Altmetric alerts about this article - https://aging.altmetric.com/details/email_updates?id=10.18632%2Faging.205245 Subscribe for free publication alerts from Aging - https://www.aging-us.com/subscribe-to-toc-alerts Keywords - aging, keratinocytes, microRNA, senescence, exosomes About Aging-US Launched in 2009, Aging-US publishes papers of general interest and biological significance in all fields of aging research and age-related diseases, including cancer—and now, with a special focus on COVID-19 vulnerability as an age-dependent syndrome. Topics in Aging-US go beyond traditional gerontology, including, but not limited to, cellular and molecular biology, human age-related diseases, pathology in model organisms, signal transduction pathways (e.g., p53, sirtuins, and PI-3K/AKT/mTOR, among others), and approaches to modulating these signaling pathways. Please visit our website at https://www.Aging-US.com​​ and connect with us: SoundCloud - https://soundcloud.com/Aging-Us Facebook - https://www.facebook.com/AgingUS/ X - https://twitter.com/AgingJrnl Instagram - https://www.instagram.com/agingjrnl/ YouTube - https://www.youtube.com/@AgingJournal LinkedIn - https://www.linkedin.com/company/aging/ Pinterest - https://www.pinterest.com/AgingUS/ Media Contact 18009220957 MEDIA@IMPACTJOURNALS.COM

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.08.04.551608v1?rss=1 Authors: Gomez-Ferrer, M., Amaro-Prellezo, E., Albiach-Delgado, A., Ten-Domenech, I., Kuligowski, J., Sepulveda, P. Abstract: Premature infants (PIs) are at risk of suffering necrotizing enterocolitis (NEC), and infants consuming human milk (HM) show a lower incidence than infants receiving formula. The composition of HM has been studied in depth, but the lipid content of HM-derived small extracellular vesicles (HM sEVs) remains unexplored. We isolated HM sEVs from HM samples and analyzed their oxylipin content using liquid chromatography coupled to mass spectrometry, which revealed the presence of anti-inflammatory oxylipins. We then examined the efficacy of a mixture of these oxylipins in combating inflammation and fibrosis, in vitro and and in a murine model of inflammatory bowel disease (IBD). HM-related sEVs contained higher concentrations of oxylipins derived from docosahexaenoic acid, an omega-3 fatty acid. Three anti-inflammatory oxylipins, 14-HDHA, 17-HDHA, and 19,20-DiHDPA ({omega}3 OXLP), demonstrated similar efficacy to HM sEVs in preventing cell injury, inducing re-epithelialization, mitigating fibrosis, and modulating immune responses. Both {omega}3 OXLP and HM sEVs effectively reduced inflammation in IBD-model mice, preventing colon shortening, infiltration of inflammatory cells and tissue fibrosis. Incorporating this unique cocktail of oxylipins into fortified milk formulas might reduce the risk of NEC in PIs and also provide immunological and neurodevelopmental support. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.28.551012v1?rss=1 Authors: Santiago, J. V., Natu, A., Ramelow, C. C., Rayaprolu, S., Xiao, H., Kumar, V., Seyfried, N., Rangaraju, S. Abstract: Microglia are resident immune cells of the brain that play important roles in mediating inflammatory responses in several neurological diseases via direct and indirect mechanisms. One indirect mechanism may involve extracellular vesicle (EV) release, so that the molecular cargo transported by microglia-derived EVs can have functional effects by facilitating intercellular communication. The molecular composition of microglia-derived EVs, and how microglial activation states impacts EV composition and EV-mediated effects in neuroinflammation, remain poorly understood. We hypothesize that microglia-derived EVs have unique molecular profiles that are determined by microglial activation state. Using size-exclusion chromatography to purify EVs from BV2 microglia, combined with proteomic (label-free quantitative mass spectrometry or LFQ-MS) and transcriptomic (mRNA and non-coding RNA seq) methods, we obtained comprehensive molecular profiles of microglia-derived EVs. LFQ-MS identified several classic EV proteins (tetraspanins, ESCRT machinery, and heat shock proteins), in addition to over 200 proteins not previously reported in the literature. Unique mRNA and microRNA signatures of microglia-derived EVs were also identified. After treating BV2 microglia with lipopolysaccharide (LPS), interleukin-10, or transforming growth factor beta, to mimic pro-inflammatory, anti-inflammatory, or homeostatic states, respectively, LFQ-MS and RNA seq revealed novel state-specific proteomic and transcriptomic signatures of microglia-derived EVs. Particularly, LPS treatment had the most profound impact on proteomic and transcriptomic compositions of microglia-derived EVs. Furthermore, we found that EVs derived from LPS-activated microglia were able to induce pro-inflammatory transcriptomic changes in resting responder microglia, confirming the ability of microglia-derived EVs to relay functionally-relevant inflammatory signals. These comprehensive microglia-EV molecular datasets represent important resources for the neuroscience and glial communities, and provide novel insights into the role of microglia-derived EVs in neuroinflammation. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.23.550235v1?rss=1 Authors: Tsutsumi, R., Ueberheide, B., Liang, F.-X., Neel, B. G., Sakai, R., Saito, Y. Abstract: Glycolysis is a fundamental cellular process, yet its regulatory mechanisms remain incompletely understood. Here, we show that a subset of glucose transporter 1 (GLUT1/SLC2A1) co-endocytoses with platelet-derived growth factor (PDGF) receptor (PDGFR) upon PDGF-stimulation. Furthermore, multiple glycolytic enzymes localize to these endocytosed PDGFR/GLUT1-containing vesicles adjacent to mitochondria. Contrary to current models, which emphasize the importance of glucose transporters on the cell surface, we find that PDGF-stimulated glucose uptake depends on receptor/transporter endocytosis. Our results suggest that growth factors generate glucose-loaded endocytic vesicles that deliver glucose to the glycolytic machinery in proximity to mitochondria, and argue for a new layer of regulation for glycolytic control governed by cellular membrane dynamics. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.14.549082v1?rss=1 Authors: Brahmer, A., Geiss, C., Lygeraki, A., Neuberger, E., Tzaridis, T., Nguyen, T. T., Luessi, F., Regnier-Vigouroux, A., Hartmann, G., Simon, P., Endres, K., Bittner, S., Reiners, K. S., Kramer-Albers, E.-M. Abstract: Extracellular vesicles (EVs) derived from the CNS are potential liquid-biopsy markers for early detection and monitoring of neurodegenerative diseases and brain tumors. This study assessed the performance of a bead-based flow cytometry assay (EV Neuro) for multiparametric detection of CNS-derived EVs and identification of disease-specific markers. Different sample materials and EV isolation methods were compared. Glioblastoma- and primary human astrocyte-derived EVs exhibited distinct EV profiles, with signal intensities increasing with higher EV input. Analysis of serum or plasma from glioblastoma, multiple sclerosis, Alzheimers Disease patients and healthy controls showed varying marker signal intensities. Notably, data normalization improved marker identification. Specific EV populations, such as CD36+EVs in glioblastoma and GALC+EVs in multiple sclerosis, were significantly elevated in disease compared to controls. Clustering analysis techniques effectively differentiated glioblastoma patients from controls. A potential correlation between CD107a+EVs and neurofilament levels in the blood was identified in multiple sclerosis patients. Together, the semi-quantitative EV Neuro assay demonstrated its utility for EV profiling in complex samples. However, reliable statistical results in biomarker studies require large sample cohorts and high effect sizes. Nonetheless, this exploratory trial confirmed the feasibility of discovering EV-associated biomarkers and monitoring circulating EV profiles in CNS diseases using the EV Neuro assay. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.06.547909v1?rss=1 Authors: Salazar Lazaro, A., Trimbuch, T., Vardar, G., Rosenmund, C. Abstract: The SNARE proteins are central in membrane fusion and, at the synapse, neurotransmitter release. However, their involvement in the dual regulation of the synchronous release while maintaining a pool of readily releasable vesicles remains unclear. Using a chimeric approach, we performed a systematic analysis of the SNARE domain of STX1A by exchanging the whole SNARE domain or its N- or C-terminus subdomains with those of STX2. We expressed these chimeric constructs in STX1-null hippocampal mouse neurons. Exchanging the C-terminal half of STX1 SNARE domain with that of STX2 resulted in a reduced RRP accompanied by an increased release rate, while inserting the C-terminal half of STX1 SNARE domain into STX2 lead to an enhanced priming and decreased release rate. Additionally, we found that the mechanisms for clamping spontaneous, but not for Ca2+-evoked release, are particularly susceptible to changes in specific residues on the outer surface of the C-terminus of the SNARE domain of STX1A. Particularly, mutations of D231 and R232 affected the fusogenicity of the vesicles. We propose that the C-terminal half of the SNARE domain of STX1A plays a crucial role in the stabilization of the RRP as well as in the clamping of spontaneous synaptic vesicle fusion through the regulation of the energetic landscape for fusion. Additionally, although it may facilitate Ca2+-dependent release, its role in this process is less significant. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.03.547488v1?rss=1 Authors: Romenskaja, D., Jonavice, U., Pivoriunas, A. Abstract: Autophagy dysfunction has been closely related with pathogenesis of many neurodegenerative diseases and therefore represents a potential therapeutic target. Extracellular vesicles (EVs) may act as a potent anti-inflammatory agents and also modulators of autophagy in target cells. However, the molecular mechanisms by which EVs modulate autophagy flux in human microglia remain largely unexplored. In the present study we investigated the effects of EVs derived from human oral mucosa stem cells on the autophagy in human microglia. We demonstrate that EVs promoted autophagy and autophagic flux in human microglia and that this process was dependent on the integrity of lipid rafts. LPS also activated autophagy, but combined treatment with EVs and LPS suppressed autophagy response indicating interference between these signalling pathways. Blockage of Toll-like receptor 4 (TLR4) with anti-TLR4 antibody suppressed EV-induced autophagy. Furthermore, blockage of EV- asscoiated HSP70 chaperone which is one of the endogenous ligands of the TLR4 also suppressed EV- induced lipid raft formation and autophagy. Pre-treatment of microglia with selective inhibitor of v{beta}3/v{beta}5 integrins cilengitide inhibited EV-induced autophagy. Finally, blockage of purinergic P2X4 receptor (P2X4R) with selective inhibitor 5-BDBD also suppressed of EV-induced autophagy. In conclusion, we demonstrate that EVs activate autophagy in human microglia through interaction with HSP70/TLR4, V{beta}3/V{beta}5, and P2X4R signalling pathways and that these effects depend on the integrity of lipid rafts. Our findings could be used for development of new therapeutic strategies targeting disease-associated microglia. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.06.30.547240v1?rss=1 Authors: Vasudevan, A., Ratnakaran, N., Murthy, K., Ahlawat, S., Koushika, S. P. Abstract: Asymmetric transport of cargo across axonal branches is a field of active research. Mechanisms contributing to preferential cargo transport along specific branches in vivo in wild type neurons are poorly understood. We find that anterograde synaptic vesicles preferentially enter the synaptic branch or pause at the branch point in C. elegans PLM neurons. The anterograde motor UNC-104/KIF1A regulates this vesicle behaviour at the branch point. Reduced levels of functional UNC-104 cause vesicles to predominantly pause at the branch point and lose their preference for turning into the synaptic branch. SAM-4/Myrlysin, which aids in recruitment/activation of UNC-104 on synaptic vesicles, regulates vesicle behaviour at the branch point similar to UNC-104. Increasing the levels of UNC-104 increases the preference of vesicles to go straight towards the asynaptic end. This suggests that the neuron optimises UNC-104 levels on the cargo surface to maximise the fraction of vesicles entering the branch and minimise the fraction going to the asynaptic end. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.30.537820v1?rss=1 Authors: Fowler, S. L., Behr, T. S., Turkes, E., Maglio-Cauhy, P., Foiani, M. S., Schaler, A., Crowley, G., Bez, S., Ficulle, E., Tsefou, E., O'Brien, D. P., Fischer, R., Geary, B., Gaur, P., Miller, C., D'Acunzo, P., Levy, E., Duff, K. E., Ryskeldi-Falcon, B. Abstract: The abnormal assembly of tau protein in neurons is the pathological hallmark of multiple neurodegenerative diseases, including Alzheimer's disease (AD). Assembled tau also associates with extracellular vesicles (EVs) in the central nervous system of patients with AD, which has been linked to its clearance and prion-like propagation between neurons. However, the identities of the assembled tau species and the EVs, as well as how they associate, are not known. Here, we combined quantitative mass spectrometry, in situ cryo-electron tomography (cryo-ET) and single-particle cryo-electron microscopy (cryo-EM) to study brain EVs isolated from AD patients. We found filaments formed of truncated tau species enclosed within the lumen of EVs enriched in endo-lysosomal proteins. We observed multiple filament interactions, including with tethering molecules that linked filaments to the luminal EV limiting membrane, suggesting selective packaging. Our findings will guide studies into the molecular mechanisms of EV-mediated secretion of assembled tau and inform the targeting of EV-associated tau as potential therapeutic and biomarker strategies for AD. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.28.538787v1?rss=1 Authors: Raju, S., Botts, S. R., Blaser, M. C., Prajapati, K., Ho, T. W. W., Ching, C., Galant, N. J., Fiddes, L., Wu, R., Clift, C. L., Pham, T., Lee, W. L., Singh, S. A., Aikawa, E., Fish, J. E., Howe, K. L. Abstract: Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.27.538533v1?rss=1 Authors: Ehmke, L., Hause, G., Klosgen, R. B., Bennewitz, B. Abstract: For many metabolites, the major barrier between cytosol and mitochondrial matrix is the inner envelope membrane of mitochondria, the site of the respiratory electron transport chain. In consequence, it houses numerous transporters which facilitate the controlled exchange of metabolites, ions, and even proteins between these cellular compartments. While their import into the organelle can be studied with isolated mitochondria or mitoplasts, the analysis of their export from the matrix into the intermembrane space or even the cytosol demands for more sophisticated approaches. Among those, inside-out inner membrane vesicles are particularly useful, since they allow the direct presentation of the potential export substrates to the membrane without prior import into the organelle. Here we present a protocol for the isolation of such inside-out vesicles of the inner envelope membrane of plant mitochondria based on repeated freeze/thaw-cycles of freshly prepared mitoplasts. Electron microscopy and Western analysis could show that the majority of the vesicles have single envelope membranes in an inside-out topology. The vesicles are furthermore physiologically active, as demonstrated by assays measuring the enzymatic activities of Complex I (NADH dehydrogenase), Complex V (ATP synthase) and the mitochondrial processing peptidase (MPP) associated with Complex III. Hence, the method presented here provides a good basis for further studies of the inner mitochondrial envelope membrane and mitochondrial export processes. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.11.536379v1?rss=1 Authors: Oberholster, L., Mathias, A., Perriot, S., Blaser, E., Canales, M., Jones, S., Culebras, L., Gimenez, M., Kaynor, G. C., Sapozhnik, A., Richetin, K., Goelz, S., Du Pasquier, R. Abstract: JC polyomavirus (JCPyV) is the causative agent of progressive multifocal leukoencephalopathy (PML), a severe, and often fatal, demyelinating disease of the central nervous system. While PML has traditionally been characterized as a lytic infection of oligodendrocytes, more recent findings suggest an important role for astrocytes during the initial stages of disease. Here, using human induced pluripotent stem cell-derived astrocytes coupled with a multiparametric approach, we show that astrocytes are readily infected with JCPyV that strongly impacts their biology, inducing a unique proteomic signature. Furthermore, the changes observed mirror elements of ex vivo findings in PML brain lesions, including dysregulation of the cell cycle and activation of the DNA damage response. We also demonstrate that this signature is extended to extracellular vesicles (EVs) while being strikingly different from that of inflammatory conditions. Thus, our results support the relevance of using brain-derived EVs as a means to gain mechanistic insights into JCPyV pathophysiology in the brain and pave the way towards the identification of new biomarkers for the early stratification of patients at risk of developing PML. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.11.535831v1?rss=1 Authors: Weichard, I., Taschenberger, H., Gsell, F., Bornschein, G., Ritzau-Jost, A., Schmidt, H., Kittel, R. J., Eilers, J., Neher, E., Hallermann, S., Nerlich, J. Abstract: Pre- and postsynaptic forms of long-term potentiation (LTP) are candidate synaptic mechanisms underlying learning and memory. At layer 5 pyramidal neurons LTP increases the initial synaptic strength but also short-term depression during high-frequency transmission. This classical form of presynaptic LTP has been referred to as redistribution of synaptic efficacy. However, the underlying mechanisms remain unclear. We therefore performed whole-cell recordings from layer 5 pyramidal neurons in acute cortical slices of rats and analyzed presynaptic function before and after LTP induction by paired pre- and postsynaptic neuronal activity. LTP was successfully induced in about half of the synaptic connections tested and resulted in increased synaptic depression during high-frequency transmission and a decelerated recovery from depression due to an increased occurrence of a slow recovery component. Analysis with a recently established sequential two-step vesicle priming model indicates an increase in the abundance of fully-primed and slowly-recovering vesicles. A systematic analysis of short-term plasticity and synapse-to-synapse variability of synaptic strength at various types of synapses revealed that stronger synapses generally recover more slowly from synaptic depression. Finally, pharmacological stimulation of the cyclic adenosine monophosphate (cAMP) and diacylglycerol (DAG) signaling pathways, which are both known to promote synaptic vesicle priming mimicked electrically-induced LTP and slowed the recovery from depression. Our data thus demonstrate that LTP at layer 5 pyramidal neurons increases synaptic strength primarily by enlarging a subpool of fully-primed slowly-recovering vesicles. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.04.535547v1?rss=1 Authors: Adamo, G., Santonicola, P., Picciotto, S., Gargano, P., Nicosia, A., Longo, V., Aloi, N., Romancino, D. P., Paterna, A., Rao, E., Raccosta, S., Noto, R., Salamone, M., Costa, S., Alfano, C., Zampi, G., Colombo, P., Wei, M., Touzet, N., Manno, M., Di Schiavi, E., Bongiovanni, A. Abstract: Nanoalgosomes are extracellular vesicles (EVs) released by microalgal cells that can mediate intercellular and cross-kingdom communication. In the present study, the optimization of high quality nanoalgosome manufacturing from cultures of the marine microalgae Tetraselmis chuii has been enhanced by quality control procedures, applying robust biophysical and biochemical characterizations. Then, we evaluated the biological properties of nanoalgosomes in pre-clinical models. Our investigation of nanoalgosome biocompatibility included toxicological and genetic analyses, starting from studies on the invertebrate model organism Caenorhabditis elegans and proceeding to hematological and immunological evaluations in mice and human cells. Nanoalgosome biodistribution was evaluated in mice with accurate space-time resolution, and in C. elegans at cellular and subcellular levels. Further examination highlighted the antioxidant and anti-inflammatory bioactivities of nanoalgosomes. This holistic approach to nanoalgosome characterization showcases that nanoalgosomes are innate effectors for novel cosmetic formulations and EV-based therapies. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.04.01.535193v1?rss=1 Authors: Huang, Y., Abdelgawad, A. G. A., Turchinovich, A., Queen, S., Abreu, C. M., Zhu, X., Batish, M., Zheng, L., Witwer, K. W. Abstract: Introduction: Antiretroviral treatment regimens can effectively control HIV replication and some aspects of disease progression. However, molecular events in end-organ diseases such as central nervous system (CNS) disease are not yet fully understood, and routine eradication of latent reservoirs is not yet in reach. Extracellular vesicle (EV) RNAs have emerged as important participants in HIV disease pathogenesis. Brain tissue-derived EVs (bdEVs) act locally in the source tissue and may indicate molecular mechanisms in HIV CNS pathology. Using brain tissue and bdEVs from the simian immunodeficiency virus (SIV) model of HIV disease, we profiled messenger RNAs (mRNAs), microRNAs (miRNAs), and circular RNAs (circRNAs), seeking to identify possible networks of RNA interaction in SIV infection and neuroinflammation. Methods: Postmortem occipital cortex tissues were obtained from pigtailed macaques either not infected or dual-inoculated with SIV swarm B670 and clone SIV/17E-Fr. SIV-inoculated groups included samples collected at different time points during acute infection or chronic infection without or with CNS pathology (CP- or CP+). bdEVs were separated and characterized in accordance with international consensus standards. RNAs from bdEVs and source tissue were used for sequencing and qPCR to detect mRNA, miRNA, and circRNA levels. Results: Multiple dysregulated bdEV RNAs, including mRNAs, miRNAs, and circRNAs, were identified in acute and CP+. Most dysregulated mRNAs in bdEVs reflected dysregulation in their source tissues. These mRNAs are disproportionately involved in inflammation and immune responses, especially interferon pathways. For miRNAs, qPCR assays confirmed the differential abundance of miR-19a-3p, let-7a-5p, and miR-29a-3p (acute phase), and miR-146a-5p and miR-449a-5p (CP+) in bdEVs. In addition, target prediction suggested that several circRNAs that were differentially abundant in source tissue might be responsible for specific differences in small RNA levels in bdEVs during SIV infection. Conclusions: RNA profiling of bdEVs and source tissues reveals potential regulatory networks in SIV infection and SIV-related CNS pathology. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

A new editorial paper was published in Aging (Aging-US) Volume 15, Issue 5, entitled, “Senescence and extracellular vesicles: novel partners in vascular amyloidosis.” In their editorial, researchers Meredith Whitehead, Marco Antonazzi and Catherine M. Shanahan from King's College London discussed amyloidosis—a prevalent age-associated pathology caused by the accumulation of fibrous, insoluble protein fibrils in tissues. The most common human amyloid is aortic medial amyloid (AMA), caused by aggregation of a 50-amino acid peptide called medin, which is cleaved by an unknown mechanism from its parent protein, milk fat globulin EGF-factor 8 (MFGE8). Medin is present in the vessel wall of 97% of Caucasians aged over 50- years ,yet despite its prevalence in the ageing population there is a very limited understanding of the mechanisms driving AMA. “Despite several forms of amyloidosis, including AMA and Alzheimer's disease (AD), being frequently associated with ageing, there has been limited research to date on the effect of cellular ‘ageing', termed senescence, on amyloidosis.” The novel data presented in the paper by Whitehead et al. provides evidence that vascular smooth muscle cell (VSMC)-derived small extracellular vesicles (sEVs) are key mediators of medin accumulation in the vessel wall. In addition, the authors identify, for the first time, a role for cellular senescence in triggering amyloidosis via changes in sEVs and extracellular matrix (ECM) composition. Thus, this study not only advances our understanding of how AMA is formed but uncovers potential therapeutic targets for mitigating the detrimental effects of amyloidosis on tissue function. “Further work is now required to understand the relationships between cellular ageing pathways, different forms of amyloidosis and potentially other ageing pathologies with shared mechanisms, such as vascular calcification, that often occur concomitantly within the aged ECM.” Full Editorial: DOI: https://doi.org/10.18632/aging.204571 Corresponding Author: Catherine M. Shanahan -cathy.shanahan@kcl.ac.uk Keywords: amyloid, smooth muscle cells, senescence, extracellular vesicles, medin Sign up for free Altmetric alerts about this article: https://aging.altmetric.com/details/email_updates?id=10.18632%2Faging.204571 About Aging-US Launched in 2009, Aging-US publishes papers of general interest and biological significance in all fields of aging research and age-related diseases, including cancer—and now, with a special focus on COVID-19 vulnerability as an age-dependent syndrome. Topics in Aging-US go beyond traditional gerontology, including, but not limited to, cellular and molecular biology, human age-related diseases, pathology in model organisms, signal transduction pathways (e.g., p53, sirtuins, and PI-3K/AKT/mTOR, among others), and approaches to modulating these signaling pathways. Please visit our website at https://www.Aging-US.com​​ and connect with us: SoundCloud - https://soundcloud.com/Aging-Us Facebook - https://www.facebook.com/AgingUS/ Twitter - https://twitter.com/AgingJrnl Instagram - https://www.instagram.com/agingjrnl/ YouTube - https://www.youtube.com/@AgingJournal LinkedIn - https://www.linkedin.com/company/aging/ Pinterest - https://www.pinterest.com/AgingUS/ Media Contact 18009220957 MEDIA@IMPACTJOURNALS.COM

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.03.24.534147v1?rss=1 Authors: Boutry, M., DiGiovanni, L. F., Demers, N., Fountain, A., Mamand, S., Botelho, R., Kim, P. K. Abstract: Formation and fission of tubules from lysosomal organelles, such as autolysosomes, endolysosomes or phagolysosomes, are required for lysosome reformation. However, the mechanisms governing these processes in the different forms of lysosomal organelles are poorly understood. For instance, the role of phosphatidylinositol-4-phosphate (PI(4)P) is unclear as it was shown to promote the formation of tubules from phagolysosomes but was proposed to inhibit tubule formation on autolysosomes because the loss of PI4KIII{beta} causes extensive lysosomal tubulations. Using super-resolution live-cell imaging, we show that Arf1-PI4KIII{beta} positive vesicles are recruited to tubule fission sites from autolysosomes, endolysosomes and phagolysosomes. Moreover, we show that PI(4)P is required to form autolysosomal tubules and that increased lysosomal tubulation caused by loss of PI4KIII{beta} represents impaired tubule fission. At the site of fission, we propose that Arf1-PI4KIII{beta} positive vesicles mediate a PI(3)P signal on lysosomes in a process requiring the lipid transfer protein SEC14L2. Our findings indicate that Arf1-PI4KIII{beta} positive vesicles and their regulation of PI(3)P are critical components of the lysosomal tubule fission machinery. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.03.16.532966v1?rss=1 Authors: Liu, L. L., Shannahan, J., Zheng, W. Abstract: The choroid plexus (CP) in brain ventricles secrete cerebrospinal fluid (CSF) that bathes the adjacent subventricular zone (SVZ); the latter is the largest neurogenic region in adult brain harboring neural stem/progenitor cells (NSPCs) and supplies newborn neurons to the olfactory bulb (OB) for normal olfaction. We discovered the presence of a CP-SVZ regulatory (CSR) axis in which the CP, by secreting small extracellular vesicles (sEVs), regulated adult neurogenesis in the SVZ and maintained olfaction. The proposed CSR axis was supported by 1) differential neurogenesis outcomes in the OB when animals treated with intracerebroventricular (ICV) infusion of sEVs collected from the CP of normal or manganese (Mn)-poisoned mice, 2) progressively diminished SVZ adult neurogenesis in mice following CP-targeted knockdown of SMPD3 to suppress CP sEV secretion, and 3) compromised olfactory performance in these CP-SMPD3-knockdown mice. Collectively, our findings demonstrate the biological and physiological presence of this sEV-dependent CSR axis in adult brains. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

 1:19 Labiotech.eu news2:32 Biomedical Research & Bio-Products12:15 Model N21:39 Institute of Clinical MedicineThis week our guests are Marit Inngjerdingen from the Institute of Clinical Medicine in Norway; Kyle Forcier, senior director of life sciences product marketing at Model N; and Dr. Andreas Roetzer, head of R&D for vaccines at Biomedical Research & Bio-Products.The next breakthrough in cancer treatment?In our body, we have an innate immune system and an immune system that is developed throughout life. Part of the innate immune system consists of so-called NK (natural killer) cells. This is a type of immune cell that specializes in killing cancer cells. These cells may be of great importance for cancer treatment in the future. NK cells kill cancer cells with the help of small “killer torpedoes,” or vesicles, that the NK cells secrete. Vesicles are small bubbles with a fatty wall of lipids and a space filled with toxic proteins. Researchers at the Institute of Clinical Medicine in Norway have recently discovered new things about these killer vesicles.“We have discovered that we can separate the killer torpedoes from other types of vesicles so that they form a kind of arsenal of weapons. Our research also shows that this type of vesicle is probably stored in a separate room inside the NK cell,” Miriam Aarsund Larsen said.Model N publishes revenue reportModel N, Inc. recently announced the results of its fifth annual State of Revenue Report. The report captures detailed data intended to help life sciences and high-tech industry executives grappling with how to grow company revenue and market share. Most executives named inflation as a significant headwind, with 84% calling it the single biggest impact on innovation.“Our findings show three main themes: Innovation collides with current market realities, innovation directly impacts revenue management, and the use of technology for revenue management is expanding,” said Suresh Kannan, chief product officer, Model N. “As organizations continue to navigate the current economic climate, the quality and reliability of technology solutions are more important than ever. These insights help us understand how to empower our customers to create and bring life-changing products to market.”Phase 2 study of breakthrough vaccine against toxic shock syndrome successfully completedThe first vaccine to potentially prevent Staphylococcal-induced toxic shock syndrome (TSS) has successfully completed a phase 2 study. TSS is a life-threatening condition caused by toxins that can lead to multiple organ failure and death.Nosocomial pathogen Methicillin-resistant Staphylococcus aureus (MRSA) bacteria are resistant to widely used antibiotics. Infections with MRSA are harder to treat and therapies are more expensive as the length of hospital stays is significantly prolonged. If the treatment does not lead to rapid clearance of the bacterial pathogen, dangerous symptoms such as septic or toxic shock can occur – a potentially life-threatening condition.Researchers at Biomedical Research & Bio-Products AG, under the direction of Martha Eibl, in cooperation with MedUni Vienna's Department of Clinical Pharmacology, conducted the study. The promising results showed the TSST-1 vaccine is safe and effective, with immunization lasting for at least two years. 

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.03.01.530593v1?rss=1 Authors: Soukup, J., Mosko, T., Kereïche, S., Holada, K. Abstract: Prions are responsible for a number of lethal neurodegenerative and transmissible diseases in humans and animals. Extracellular vesicles, especially small exosomes, have been extensively studied in connection with various diseases. In contrast, larger microvesicles are often overlooked. In this work, we compared the ability of large extracellular vesicles (lEVs) and small extracellular vesicles (sEVs) to spread prions in cell culture. We utilized two cell culture models of prion infection and isolated lEVs by 20,000 x g force and sEVs by 110,000 x g force. The lEV fraction was enriched in {beta}-1 integrin with a vesicle size starting at 150 nm. The fraction of sEVs was depleted of {beta}-1 integrin with a mean size of 79 nm. Both fractions were enriched in prion protein, but the lEVs contained a higher prion-converting activity. In addition, lEV infection led to stronger prion signals in both cell cultures, as detected by cell and western blotting. Our data suggest the importance of lEVs in the trafficking and spread of prions over extensively studied small EVs. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.03.02.530906v1?rss=1 Authors: Wang, H., Tao, Z., Zhao, X., Wang, G., Chen, Y., Zhang, J., Zhang, X., Liu, M., Jiang, G., He, L. Abstract: Advanced intracellular delivery of proteins has profound applications in both scientific investigations and therapies. However, existing strategies relying on various chemical and physical methods, have drawbacks such as the requirement of high concentration in vitro prepared target proteins and difficulty in labeling target proteins. Developing new delivery systems integrating the enveloping and labeling of target proteins would bring great advantages for efficient protein transfections. Here, we enriched a high concentration (62 mg/ml) of several target proteins into outer membrane vesicles (OMVs) of E. coli to employ the native property of OMVs to deliver proteins into the cytosol of eukaryotic cells. The results revealed a high protein transfection efficiency arranging from 90-97% for different cell lines. Moreover, the free penetration of molecules less than 600 Dalton across the membrane of OMVs allows direct labeling of target proteins within OMVs, facilitating the visualization of target proteins. Importantly, the nanobody delivered intracellularly by OMVs retains the biological activity of binding with its target, highlighting the advantages of OMVs as an emerging tool for efficient intracellular delivery of proteins. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.03.01.530627v1?rss=1 Authors: Urzi, O., Moschetti, M., Lasser, C., Johansson, J., D'Arrigo, D., Olofsson Bagge, R., Crescitelli, R. Abstract: Both the release of extracellular vesicles (EVs) in cell cultures and the cargo that these EVs carry can be influenced by cell culture conditions such as the presence of foetal bovine serum (FBS). Although several studies have evaluated the effect of removing FBS-derived EVs by ultracentrifugation (UC), less is known about the influence of FBS heat inactivation on the cell-derived EVs. To assess this, three protocols based on different combinations of EV depletion by UC and heat inactivation were evaluated, including FBS that was ultracentrifuged but not heat-inactivated, FBS that was heat inactivated before EV depletion, and FBS that was heat inactivated after EV depletion. The FBS samples were then added to the culture media of three melanoma cell lines, and after 72 h both large and small EVs were isolated by differential UC. We demonstrated by transmission electron microscopy, protein measurement, and quantification of the number of particles that heat inactivation performed after EV depletion reduced the purity of small EVs but had no effect on large EV purity. Quantitative mass spectrometry analysis of FBS-derived small EVs showed that the EV protein content was different when FBS was heat inactivated after EV depletion compared to EVs isolated from FBS that was not heat inactivated or that was heat inactivated prior to EV depletion. Moreover, several of the quantified proteins were wrongly attributed to be of human origin because the EVs were of obvious bovine origin. Our results demonstrated that proteins of bovine origin coming from FBS-derived EVs could mistakenly be attributed to human cell-derived EVs in EV proteomic studies. Moreover, we concluded that heat inactivation performed after EV depletion induced the release of proteins that might contaminate EV samples, and the recommendation is therefore to always perform heat inactivation prior to EV depletion. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.02.15.528649v1?rss=1 Authors: Wang, B., Liang, Z., Tan, T., Zhang, M., Jiang, Y., Shang, Y., Gao, X., Song, S., Wang, R., Chen, H., Liu, J., Li, J., Ren, Y., Liu, P. Abstract: The primary cilium plays important roles in regulating cell differentiation, signal transduction, and tissue organization. Dysfunction of the primary cilium can lead to ciliopathies and cancer. The formation and organization of the primary cilium are highly associated with cell polarity proteins, such as the apical polarity protein CRB3. However, the molecular mechanisms by which CRB3 regulates ciliogenesis and CRB3 location remain unknown. Here, we show that CRB3, as a navigator, regulates vesicle trafficking in {gamma}-TuRC assembly during ciliogenesis and cilium-related Hh and Wnt signaling pathways in tumorigenesis. Crb3 knockout mice display severe defects of the primary cilium in the mammary ductal lumen and renal tubule. CRB3 is essential for lumen formation and ciliary assembly in the mammary epithelium. We demonstrate that CRB3 localizes to the basal body and that CRB3 trafficking is mediated by Rab11-positive endosomes. Significantly, CRB3 directly interacts with Rab11 to navigate GCP6/Rab11 trafficking vesicles to CEP290, resulting in intact {gamma}-TuRC assembly. In addition, CRB3-depleted cells cannot respond to the activation of the Hh signaling pathway, while CRB3 regulates the Wnt signaling pathway. Therefore, our studies reveal the molecular mechanisms by which CRB3 recognizes Rab11-positive endosomes to navigate apical vesicle trafficking in effective ciliogenesis, maintaining cellular homeostasis and tumorigenesis. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.02.15.527595v1?rss=1 Authors: Perbet, R., Zufferey, V., Leroux, E., Parietti, E., Espourteille, J., Culebras, L., Perriot, S., Du Pasquier, R., Begard, S., Deramecou, V., Deglon, N., Toni, N., Buee, L., Colin, M., Richetin, K. Abstract: Tauopathies are neurodegenerative disorders involving the accumulation of tau isoforms in cell subpopulations such as astrocytes. The origins of the 3R and 4R isoforms of tau that accumulate in astrocytes remain unclear. Extracellular vesicles (EVs) were isolated from primary neurons overexpressing 1N3R or 1N4R tau or from human brain extracts (progressive supranuclear palsy or Pick disease patients or controls) and characterized (electron microscopy, nanoparticle tracking analysis (NTA), proteomics). After the isolated EVs were added to primary astrocytes or human iPSC-derived astrocytes, tau transfer and mitochondrial system function were evaluated (ELISA, immunofluorescence, MitoTracker staining). We demonstrated that neurons in which 3R or 4R tau accumulated had the capacity to transfer tau to astrocytes and that EVs were essential for the propagation of both isoforms of tau. Treatment with tau-containing EVs disrupted the astrocytic mitochondrial system, altering mitochondrial morphology, dynamics and redox state. Although similar levels of 3R and 4R tau were transferred, 3R tau-containing EVs were significantly more damaging to astrocytes than 4R tau-containing EVs. Moreover, EVs isolated from the brain fluid of patients with different tauopathies affected mitochondrial function in astrocytes derived from human iPSCs. Our data highlight that tau pathology spreads to surrounding astrocytes via EVs-mediated transfer and modify their function. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.02.09.527811v1?rss=1 Authors: Novick, P. J., Li, X., Liu, D., Griffis, E. Abstract: Bidirectional vesicular traffic links compartments along the exocytic and endocytic pathways. Rab GTPases have been implicated in specifying the direction of vesicular transport because anterograde vesicles are marked with a different Rab than retrograde vesicles. To explore this proposal we sought to redirect an exocytic Rab, Sec4, onto endocytic vesicles by fusing the catalytic domain of the Sec4 GEF, Sec2, onto the CUE localization domain of Vps9, a GEF for the endocytic Rab Ypt51. The Sec2GEF-GFP-CUE construct was found to localize to bright puncta predominantly near sites of polarized growth and this localization was dependent upon the ability of the CUE domain to bind to the ubiquitin moieties added to the cytoplasmic tails of proteins destined for endocytic internalization. Sec4 and Sec4 effectors were recruited to these puncta with varying efficiency. Nonetheless the Sec2GEF-GFP-CUE puncta were largely static and did not appear to fuse with the plasma membrane, suggesting that recruitment of an exocytic Rab is not sufficient to reverse the direction of an endocytic compartment. Cells expressing Sec2GEF-GFP-CUE grew surprisingly well and secreted protein at near normal efficiency, implying that Golgi derived secretory vesicles were delivered to polarized sites of cell growth, where they tethered and fused with the plasma membrane despite the misdirection of Sec4 and its effectors. A low efficiency mechanism for localization of Sec2 to secretory vesicles that is independent of known cues might be responsible. In total, the results suggest that while Rabs may play a critical role in specifying the direction of vesicular transport they cannot act alone in this regard. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

On today's ID the Future distinguished nanoscientist James Tour explains to host Eric Metaxas why the origin-of-life community is further than ever from solving the mystery of life's origin, and how the public has gotten the false impression that scientists can synthesize life in the lab. Tour explains that origin-of-life scientists aren't even close to intelligently synthesizing life from non-life in the lab. The problem, Tour says, is that some leading origin-of-life researchers give the impression they are right on the cusp of solving the problem. Not so, Tour says. He offers the analogy of someone claiming, in the year 1500, that he has the know-how to build a ship to travel to the moon, when no one yet knows Read More › Source

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.01.27.525863v1?rss=1 Authors: Cocozza, F., martin jaular, l., lippens, l., di cicco, a., arribas, y. a., dingli, f., richard, m., merle, l., Poullet, P., loew, d., Hendrix, A., Kassiotis, G., joliot, a., tkach, m., Thery, C. Abstract: Cells secrete membrane-enclosed extracellular vesicles (EVs) and non-vesicular nanoparticles (ENPs) that may play a role in intercellular communication. Tumor-derived EVs have been proposed either to induce immune priming of antigen presenting cells, or to be immuno-suppressive agents promoting tumor immune escape. We suspect that such disparate functions are due to variable composition in EV subtypes and ENPs of the analyzed EV preparations. We aimed to exhaustively characterize the array of secreted EVs and ENPs of murine tumor cell lines. Unexpectedly, we identified virus-like particles (VLPs) from endogenous murine leukemia virus in preparations of EVs produced by tumor cells. We established a robust protocol to separate small (s)EVs from VLPs and ENPs. We compared their protein composition and analyzed their functional interaction with target dendritic cells (DCs). ENPs were poorly captured and did not affect DCs. sEVs specifically induced DC death. A mixed EV/VLP preparation was the most efficient to induce DC maturation and antigen presentation. Our results call for systematic re-evaluation of the respective proportions and functions of non-viral EVs and VLPs produced by tumors and their contribution to anti-tumor immune responses and to tumor progression. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.01.11.523595v1?rss=1 Authors: Carrera-Bravo, C., Zhou, T., Hang, J. W., Modh, H., Huang, F., Malleret, B., Wacker, M. G., Wang, J.-W., Renia, L., Tan, K. S. Abstract: Malaria is a vector-borne parasitic disease that affects millions worldwide. In order to reach the objective, set by the World Health Organization to decrease the cases by 2030, antimalarial drugs with novel modes of action are required. Previously, a novel mechanism of action of chloroquine (CQ) was reported involving features of programmed cell death in the parasite, mainly characterized by calcium efflux from the digestive vacuole (DV) permeabilization. Increased intracellular calcium induces the suicidal death of erythrocytes also known as eryptosis. This study aimed to identify the hallmarks of eryptosis due to calcium redistribution and the downstream cellular effects during CQ treatment in iRBCs. Plasmodium falciparum 3D7 at mid-late trophozoites were used for the antimalarial drug treatment. Our results revealed increased phosphatidylserine (PS) exposure, cell shrinkage and membrane blebbing, delineating an eryptotic phenotype in the host RBC. Interestingly, the blebs on the surface of the iRBCs released to the extracellular milieu become extracellular vesicles (EVs) which are essential for intercellular communication due to their cargo of proteins, nucleic acids, lipids and metabolites. The proteomic characterization displayed 2 highly enriched protein clusters in EVs from CQ-treated iRBCs, the proteasome and ribosome. We demonstrated that this unique protein cargo is not associated with the parasite growth rate. Additionally, we found that these particular EVs might activate IFN signaling pathways mediated by IL-6 in THP-1-derived macrophages. Our findings shed new insights into a novel drug-induced cell death mechanism that targets the parasite and specific components of the infected host RBC. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.01.12.523768v1?rss=1 Authors: Park, J., Miller, K. G., De Camilli, P., Yogev, S. Abstract: Axonal transport is key to neuronal function. Efficient transport requires specific motor-cargo association in the soma, yet the mechanisms regulating this early step remain poorly understood. We found that EBP-1, the C. elegans ortholog of the canonical microtubule end binding protein EB1, promotes the specific association between kinesin-3/KIF1A/UNC-104 and Dense Core Vesicles (DCVs) prior to their axonal delivery. Using single-neuron, in vivo labelling of endogenous cargo and EBs, we observed reduced axonal abundance and reduced secretion of DCV cargo, but not other KIF1A/UNC-104 cargo, in ebp-1 mutants. This reduction could be traced back to fewer exit events from the cell body, where EBP-1 colocalized with the DCV sorting machinery at the trans Golgi, suggesting that this is the site of EBP-1 function. In addition to its microtubule binding CH domain, mammalian EB1 interacted with mammalian KIF1A in an EBH domain dependent manner, and expression of mammalian EB1 or the EBH domain was sufficient to rescue DCV transport in ebp-1 mutants. Our results suggest a model in which kinesin-3 binding and microtubule binding by EBP-1 cooperate to transiently enrich the motor near sites of DCV biogenesis to promote motor-cargo association. In support of this model, tethering either EBP-1 or a kinesin-3 KIF1A/UNC-104 interacting domain from an unrelated protein to the Golgi restored the axonal abundance of DCV proteins in ebp-1 mutants. These results uncover an unexpected role for a microtubule associated protein and provide insight into how specific kinesin-3 cargo are delivered to the axon. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.01.04.522609v1?rss=1 Authors: Loconte, L., Arguedas, D., Chipont, A., El, R., Guyonnet, L., Guerin, C., Piovesana, E., Vazquez-Ibar, J. L., Joliot, A., Thery, C., Martin Jaular, L. Abstract: Cell-cell communication within the complex tumor microenvironment is critical to cancer progression. Tumor-derived extracellular vesicles (TD-EVs) are key players in this process. They can interact with immune cells and modulate their activity, either suppressing or activating the immune system. Understanding the interactions between TD-EVs and immune cells is essential for understanding immune modulation by cancer cells. Fluorescent labelling of TD-EVs is a method of choice to study such interaction. This work aims to determine the impact of EV labelling methods on the detection of EV interaction and capture by the different immune cell types within human Peripheral Blood Mononuclear Cells (PBMCs), analyzed by imaging flow cytometry and multicolor spectral flow cytometry. EVs released by the triple-negative breast carcinoma cell line MDA-MB-231 were labeled either with the lipophilic dye MemGlow-488 (MG-488), with Carboxyfluorescein diacetate, succinimidyl ester (CFDA-SE), or through expression of a MyrPalm-superFolder GFP (sfGFP) that incorporates into EVs during their biogenesis using a genetically engineered cell line. Our results showed that these different labeling strategies, although analyzed with the same techniques, led to diverging results. While MG-488-labelled EVs incorporate in all cell types, CFSE-labelled EVs are restricted to a minor subset of cells and sfGFP-labelled EVs are mainly detected in CD14+ monocytes which are the main uptakers of EVs and other particles, regardless of the labeling method. Moreover, MG-488-labeled liposomes behaved similarly to MG-488 EVs, highlighting the predominant role of the labelling strategy on the visualization and analysis of TD-EVs uptake by immune cell types. Consequently, the use of different EV labeling methods has to be considered as they can provide complementary information on various types of EV-cell interaction and EV fate. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.01.01.521342v1?rss=1 Authors: Devarakonda, P. M., Sarmiento, V., Heaslip, A. T. Abstract: Toxoplasma gondii contains an essential single plastid organelle known as the apicoplast that is necessary for fatty acid, isoprenoid, and heme synthesis. Perturbations affecting apicoplast function leads to parasite death. To maintain a functional apicoplast, the parasite must execute two important cellular processes: accurate division of this single copy organelle into daughter parasites during cell division and trafficking of nuclear encoded apicoplast proteins (NEAT). In this study we demonstrate that F-actin and an unconventional myosin motor, TgMyoF, are important for both processes. Live cell imaging demonstrates that during division the apicoplast is highly dynamic, exhibiting branched, U-shaped and linear morphologies that are dependent on TgMyoF and actin. These dynamics appear to control apicoplast association with the centrosome and positioning of the centrosome at the apicoplast tips. Loss of apicoplast dynamics correlated with reduced apicoplast-centrosome association and ultimately apicoplast inheritance defects. In addition, we uncovered the role of TgMyoF and actin in NEAT protein trafficking. Vesicles containing the apicoplast protein APT1 were only observed during apicoplast division in control parasites, however loss of TgMyoF and actin lead to accumulation of vesicles in the cytosol, with only a small impact on vesicle movement suggesting that this actomyosin system is important for vesicle fusion with the apicoplast. Consequently, loss of TgMyoF resulted in reduced apicoplast length. This study has provided crucial new insight into mechanisms and timing of protein trafficking to the apicoplast and demonstrated how apicoplast-centrosome association, a key step in the apicoplast division cycle, is control by the actomyosin cytoskeleton. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.22.521565v1?rss=1 Authors: Bian, X., Zhu, J., Jia, X., Liang, W., Li, Z., Yu, S., Rao, Y. Abstract: It has never been easy to discover a new neurotransmitter, especially one in the central nervous system (CNS). We have been searching for new neurotransmitters for 12 years. We detected creatine (Cr) in synaptic vesicles (SVs), at a level lower than glutamate (Glu) and gamma-aminobutyric acid (GABA) but higher than acetylcholine (ACh) and 5-hydroxytryptamine (5-HT). SV Cr was reduced in mice lacking either arginine:glycine amidinotransferase (AGAT, a Cr synthetase) or SLC6A8, a Cr transporter with mutations among the most common causes of intellectual disability (ID) in men. Calcium-dependent release of Cr was detected after stimulation in brain slices. Cr release was reduced in SLC6A8 and AGAT mutants. Cr inhibited neocortical pyramidal neurons. SLC6A8 was necessary for Cr uptake into synaptosomes. Cr was found by us to be taken up into SVs in an ATP dependent manner. Thus, our biochemical, chemical, genetic and electrophysiological results suggest Cr as a neurotransmitter, illustrate a novel approach to discover neurotransmitters and provide a new basis for ID pathogenesis. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.22.521499v1?rss=1 Authors: Burgy, O., Mayr, C. H., Ballester Llobell, B., Sengupta, A., Schenesse, D., Coughlan, C., Parimon, T., Chen, P., Lindner, M., Hilgendorff, A., Mann, M., Yildirim, A. O., Eickelberg, O., Lehmann, M., Schiller, H. B., Burgstaller, G., Königshoff, M. Abstract: Idiopathic pulmonary fibrosis (IPF) is a lethal and chronic lung disease characterized by aberrant intercellular communication, increased extracellular matrix (ECM) deposition, and destruction of functional lung tissue. Extracellular vesicles (EVs) accumulate within the lung in IPF, but their cargo and biological effects remain unclear. Here, we provide the entire the proteome of EV and non-EV fraction during pulmonary fibrosis, and functionally characterize their contribution to fibrosis. EVs were isolated by differential ultracentrifugation of broncho-alveolar lavage fluid (BALF) collected from mice challenged with bleomycin (or PBS as control) or culture supernatants from primary mouse lung fibroblasts. EVs were characterized by nanoparticle tracking analysis, Western Blotting, and quantitative mass spectrometry to define their proteome. EVs accumulation peaked at 14 days post-bleomycin instillation and correlated with decreased lung function. Label-free proteomics identified 107 proteins specific to fibrotic BALF-EVs. This signature was associated with wound healing, extracellular matrix organization, and cell motility. BALF-EVs from fibrotic lungs promoted fibrogenesis, including induction of ECM proteins in precision cut lung slices ex vivo and impaired alveolar epithelial cell stem cell function. Deconvolution using single cell RNA sequencing datasets revealed that fibroblasts are the major cellular source of BALF-EVs. EVs from fibroblasts were significantly enriched in Secreted Frizzled Related Protein 1 (SFRP1). In the lungs of patients with IPF, SFRP1 was significantly increased in mesenchymal cells. Sfrp1 deficiency reduced the ability of fibroblast-derived EVs to potentiate bleomycin-induced lung fibrosis in vivo and led to a reduction in fibrosis marker gene expression. In sum, EVs carry specific protein cargos, such as SFRP1, to contribute to organ remodeling during fibrosis. Our data identified EVs transporting SFRP1 as a potential therapeutic target for IPF. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.21.521536v1?rss=1 Authors: Vale-Costa, S., Etibor, T. A., Bras, D., Sousa, A. L., Amorim, M. J. Abstract: Many viruses that threaten public health establish condensates via phase transitions to complete their lifecycles, and knowledge on such processes is key for the design of new antivirals. In the case of influenza A virus, liquid condensates known as viral inclusions are sites dedicated to the assembly of its 8-partite RNA genome. Liquid viral inclusions emerge near the endoplasmic reticulum (ER) exit sites, but we lack the molecular understanding on how the ER contributes to their biogenesis. We show here that viral inclusions develop at remodeled ER sites and display dynamic interactions using the ER, including fusion and fission events and sliding movements. We also uncover a novel role for the host factor, ATG9A, in mediating the exchange of viral inclusions between the ER and microtubules. Depletion of ATG9A arrests viral inclusions at microtubules and prevents their accumulation at the ER, leading to a significantly reduced production of viral genome complexes and infectious virions. In light of our recent findings, we propose that a remodeled ER supports the dynamics of liquid IAV inclusions, with ATG9A acting locally to facilitate their formation. This work advances our current knowledge regarding influenza genome assembly, but also reveals new roles for ATG9A beyond its classical involvement in autophagy. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.19.521008v1?rss=1 Authors: Mary, B., Asokan, N., jerabkova-Roda, K., Larnicol, A., Busnelli, I., Stemmelen, T., Pichot, A., Molitor, A., Carapito, R., Lefebvre, O., GOETZ, J. G., Hyenne, V. Abstract: Extracellular vesicles released by tumors (tEVs) disseminate via circulatory networks and promote microenvironmental changes in distant organs favoring metastatic seeding. Despite their abundance in the bloodstream, how hemodynamics affect the function of circulating tEVs remains unsolved. We experimentally tuned flow profiles in vitro (microfluidics) and in vivo (zebrafish) and demonstrated that efficient uptake of tEVs occurs in endothelial cells subjected to capillary-like hemodynamics. Such flow profiles partially reroute internalized tEVs towards non-acidic and non-degradative Rab14-positive endosomes, at the expense of lysosomes, suggesting that endothelial mechanosensing diverts tEVs from degradation. Subsequently, tEVs promote the expression of pro-angiogenic transcription factors in flow-stimulated endothelial cells and favor vessel sprouting in zebrafish. Altogether, we demonstrate that capillary-like flow profiles potentiate the pro-tumoral function of circulating tEVs by promoting their uptake and rerouting their trafficking. We propose that tEVs contribute to pre-metastatic niche formation by exploiting endothelial mechanosensing in specific vascular regions with permissive hemodynamics. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.16.520798v1?rss=1 Authors: Belliveau, J., PAPOUTSAKIS, E. T. Abstract: A new area of focus in Chinese Hamster Ovary (CHO) biotechnology is the role of small (exosomes) and large (microvesicles or microparticles) extracellular vesicles (EVs). CHO cells in culture exchange large quantities of proteins and RNA through these EVs, yet the content and role of these EVs remain elusive. MicroRNAs (miRs) are central to adaptive responses to stress and more broadly to changes in culture conditions. Given that EVs are highly enriched in miRs, and that EVs release large quantities of miRs both in vivo and in vitro, EVs and their miR content likely play an important role in adaptive responses. Here we report the miRNA landscape of CHO cells and their EVs under normal culture conditions and under ammonia and osmotic stress. We show that both cells and EVs are highly enriched in five miRs (among over 600 miRs) that make up about half of their total miR content, and that these highly enriched miRs differ significantly between normal and stress culture conditions. Notable is the high enrichment in mir-92a and miR-23a under normal culture conditions, in contrast to the high enrichment in let-7 family miRs (let-7c, let-7b and let-7a) under both stress conditions. The latter suggests a preserved stress-responsive function of the let-7 miR family, one of the most highly preserved miR families across species, where among other functions, let-7 miRs regulate core oncogenes, which, depending on the biological context, may tip the balance between cell cycle arrest and apoptosis. While the expected, based on their profound enrichment, important role of these highly enriched miRs remains to be dissected, our data and analysis constitute an important resource for exploring the role of miRs in cell adaptation as well as for synthetic applications. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.18.520919v1?rss=1 Authors: Beatriz, M., Rodrigues, R., Vilaca, R., Egas, C., Pinheiro, P., Daley, G. Q., Schlaeger, T. M., Rego, A. C., Lopes, C. Abstract: Extracellular vesicles (EVs) carry bioactive molecules associated with various biological processes, including miRNAs. In both Huntingtons disease (HD) models and human samples, altered expression of miRNAs involved in synapse regulation were reported. Recently, the use of EV cargo to reverse phenotypic alterations in disease models with synaptopathy as the end-result of the pathophysiological cascade has become an interesting possibility. Here, we assessed the contribution of EVs to GABAergic synaptic alterations using a human HD model and studied the miRNA content of isolated EVs. After differentiating HD human induced-pluripotent stem cells into electrophysiologically active striatal-like GABAergic neurons, we found that HD-derived neurons displayed reduced density of inhibitory synapse markers and of GABA receptor-mediated ionotropic signaling. Treatment with EVs secreted by control (CTR) fibroblasts reversed the deficits in GABAergic synaptic transmission and increased the density of inhibitory synapses on HD-neuron cultures, while EVs from HD-derived fibroblasts had the opposite effects on CTR-neurons. Moreover, analysis of miRNAs from purified EVs identified a set of differentially expressed miRNAs between manifest HD, premanifest and CTR lines with predicted synaptic targets. The EVs-mediated reversal of the abnormal GABAergic phenotype in HD-derived neurons reinforces the potential role of EVs-miRNAs on synapse regulation. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.18.520919v1?rss=1 Authors: Beatriz, M., Rodrigues, R., Vilaca, R., Egas, C., Pinheiro, P., Daley, G. Q., Schlaeger, T. M., Rego, A. C., Lopes, C. Abstract: Extracellular vesicles (EVs) carry bioactive molecules associated with various biological processes, including miRNAs. In both Huntington's disease (HD) models and human samples, altered expression of miRNAs involved in synapse regulation were reported. Recently, the use of EV cargo to reverse phenotypic alterations in disease models with synaptopathy as the end-result of the pathophysiological cascade has become an interesting possibility. Here, we assessed the contribution of EVs to GABAergic synaptic alterations using a human HD model and studied the miRNA content of isolated EVs. After differentiating HD human induced-pluripotent stem cells into electrophysiologically active striatal-like GABAergic neurons, we found that HD-derived neurons displayed reduced density of inhibitory synapse markers and of GABA receptor-mediated ionotropic signaling. Treatment with EVs secreted by control (CTR) fibroblasts reversed the deficits in GABAergic synaptic transmission and increased the density of inhibitory synapses in HD-neuron cultures, while EVs from HD-derived fibroblasts had the opposite effects on CTR-neurons. Moreover, analysis of miRNAs from purified EVs identified a set of differentially expressed miRNAs between manifest HD, premanifest and CTR lines with predicted synaptic targets. The EVs-mediated reversal of the abnormal GABAergic phenotype in HD-derived neurons reinforces the potential role of EVs-miRNAs on synapse regulation. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.12.12.520075v1?rss=1 Authors: Small, C., Harper, C., Jiang, A., Kontaxi, C., Yak, N., Malapaka, A., Davenport, E., Wallis, T., Gormal, R., Joensuu, M., Martinez-Marmol, R., Cousin, M. A., Meunier, F. A. Abstract: Following exocytosis, the recapture of plasma membrane-stranded vesicular proteins into recycling synaptic vesicles (SVs) is essential for sustaining neurotransmission. Surface clustering of vesicular proteins has been postulated as a 'pre-assembly' mechanism for endocytosis - ensuring high-fidelity retrieval. Here, we used single-molecule imaging to examine the nanoclustering of synaptotagmin-1 (Syt1) and synaptic vesicle protein 2A (SV2A) in hippocampal neurons. Syt1 forms surface nanoclusters through interaction of its C2B domain with SV2A, that are sensitive to mutations in this domain (Syt1K326A/K328A) and knocking down SV2A. SV2A co-cluster with Syt1 and blocking SV2A's cognate interaction with Syt1 (SV2AT84A) also decreased SV2A clustering. Surprisingly, impairing SV2A-Syt1 nanoclustering enhanced plasma membrane recruitment of key endocytic protein dynamin-1, leading to accelerated Syt1 endocytosis, altered intracellular sorting and decreased trafficking of Syt1 to Rab5-positive endocytic compartments. SV2A-Syt1 surface nanoclusters therefore negatively regulate the rate of their own re-entry into recycling SVs by controlling the recruitment of the endocytic machinery. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Listen to Kasra Khalaj gave his presentation of "MicroRNAs in amniotic fluid stem cellextracellular vesicles modulate lung development in experimental congenital diaphragmatic hernia" at the first ever Best of the Best in Pediatric Surgery event.

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.10.31.514442v1?rss=1 Authors: Lazaris, A., Metrakos, P., Petrillo, S. Abstract: There are a number of methods for the isolation of extracellular vesicles (EV) which include the traditional ultracentrifugation to column-based kits available from different companies. Isolation of EVs from complex fluids, such as blood, has several challenges as the detection of low abundance molecules can easily be masked by more abundant proteins, when performing mass spectrometry. For this reason, several commercially available kits contain Thromboplastin D (TP-D) to promote clotting, thus removing clotting factors and abundant proteins resulting in increased detection of proteins. Our study demonstrates that plasma pretreated with Rabbit brain derived TP-D (the most common additive), generated a dynamic range of proteins compared to plasma alone, however, most of these proteins were contaminants introduced from the TP-D (99.1% purity). As an alternative, we tested recombinant TP and demonstrated that although it did not introduce any significant contaminants, we did not see any difference in the detection of proteins. Thus TP-D is not required, and any protein additives must be carefully screened. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2022.10.31.514487v1?rss=1 Authors: Nedachi, T., Bonod, C., Rorteau, J., Chinoune, W., Ischiuchi, Y., Hugues, S., Gillet, B., Sigaudo-Roussel, D., Lamartine, J. Abstract: The disturbance of intercellular communication is one of the hallmarks of aging. The goal of this study is to clarify the impact of chronological aging on extracellular vesicles (EVs), a key mode of communication in mammalian tissues. We focused on epidermal keratinocytes, the main cells of the outer protective layer of the skin which is strongly impaired in the skin of elderly. EVs were purified from conditioned medium of primary keratinocytes isolated from infant or aged adult skin. A significant increase of the relative number of EVs released from aged keratinocytes was observed whereas their size distribution was not modified. By small RNA sequencing, we described a specific microRNA (miRNA) signature of aged EVs with an increase abundance of miR-30a, a key regulator of barrier function in human epidermis. EVs from aged keratinocytes were found to be able to reduce the proliferation of young keratinocytes, to impact their organogenesis properties in a reconstructed epidermis model and to slow down the early steps of skin wound healing in mice, three features observed in aged epidermis. This work reveals that intercellular communication mediated by EVs is modulated during aging process in keratinocytes and might be involved in the functional defects observed in aged skin. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

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On Thursdays with Sharon, Sharon Even welcomes back Refael Elbaz CEO of Unicargo International Logistics to give us an update on the current Shipping & Logistics situation. We go over: * USTR Exclusion of 352 products from Trump tariffs - Can you get refunds on the tariffs paid, if so how and what you need to know. * Update on current Shipping Rates * Port Congestion Update - How many Vesicles at anchor, time it takes to pass customs currently, and our prediction of what is to come * China Lockdowns and how they have and are impacting shipping and logistics * Labor Union Negotiations - How this may impact the LA ports * Bidon ban on Russian oil and how this is impacting trucking and more. Seller Sessions is now sold out! 19 tickets left for Branded By Women.Grab tickets for Branded By Women Live brought to you by Branded. Use Discount code: 10BBW Grab Tickets Now: https://brandedbywomen.com/ Hosted by: Sharon Even and Izabela Hamilton Featuring Yael Cabilly, Melanie Shabangu, Olivia Jones, Amy Wees, Cassandra Craven, Jana Krekic, Michele Venton, Cara Sayer and Kata Phipps and many more Grab Tickets Now: https://brandedbywomen.com/ Ticket includes the full day conference and the Cocktail party brought to you by Helium 10 Big Thank you to our sponsors: Branded, AVASK, Helium 10 and Multiplymii, Carbon6

On this episode, I talk to Luisa Weiss who is a PhD student in Dublin, Ireland. Luisa's has recently published a very interesting paper in the Journal of Thrombosis and Haemostasis entitled: "Nonvalvular atrial fibrillation patients anticoagulated with rivaroxaban compared with warfarin exhibit reduced circulating extracellular vesicles with attenuated pro-inflammatory protein signatures" Here, we talk about the paper, further questions, and the clinical implications of her findings. The paper is available as an open access publication at https://onlinelibrary.wiley.com/doi/10.1111/jth.15434?af=R

Dillon, Robert, and Sam talk about men's bodies and death. --- This episode is sponsored by · Anchor: The easiest way to make a podcast. https://anchor.fm/app