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Osama Harraz

@osamaharraz.bsky.social
982 followers 956 following 80 posts

Assistant Professor, Bloomfield Professor in Cardiovascular Research - decoding the complexity of vascular physiology and blood flow control, one ion channel at a time. Univ. of Vermont www.HarrazLab.com

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Reposted by Osama Harraz
Denise J. Cai, Ph.D. @denisejcai.bsky.social · 30/09/2026
NEW: The anterior hypothalamic nucleus acts like a volume knob for stress, scaling the brain’s response to threatening events 🧠 Read the Cai Lab's latest paper, led by @zachtpennington.bsky.social, in @nature.com 🎉 www.nature.com/articles/s41... More: bsky.app/profile/did:...
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Osama Harraz @osamaharraz.bsky.social · 19/09/2026
Insanely amazing! Whole body calcium imaging ⚡️⚡️🐠
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Osama Harraz @osamaharraz.bsky.social · 19/09/2026
😅
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Reposted by Osama Harraz
Geoanna M. Bautista, M.D. @geoannabautista.bsky.social · 10/09/2026
Mechanosensation isn't just at the cell surface. In gut smooth muscle, we found that Piezo1 is mostly intracellular, <40 nm from RyR and BK channels. Activating it hyperpolarizes cells and weakens contraction- like a molecular brake. Stay tuned for more to come! J Physiol: doi.org/10.1113/JP29...
doi.org
Intracellular mechanosensation in intestinal smooth muscle: Piezo1 complexes amplify signalling beyond the surface
Abstract figure legend Mechanosensation is not confined to the cell surface. In intestinal smooth muscle Piezo1 is predominantly intracellular (86%), where it forms a nanoscale (<40 nm) complex at th...
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Osama Harraz @osamaharraz.bsky.social · 08/08/2026
Check out our latest article! Tau and ion channels (Piezo1 and Kir2.1) in brain capillaries.
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Reposted by Osama Harraz
Biophysical Journal @biophysj.bsky.social · 05/08/2026
#OPENACCESS: Tau protein differentially affects Piezo1 and Kir2.1 channels in brain capillary endothelial cells. Trevor Harriman and Osama F. Harraz. buff.ly/RZnqLJd
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Osama Harraz @osamaharraz.bsky.social · 04/07/2026
Don't miss this!
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Osama Harraz @osamaharraz.bsky.social · 04/07/2026
Don't miss this!
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Reposted by Osama Harraz
Jorge Castorena @jcastorena.bsky.social · 05/06/2026
Our newest study is now published. Here we show that GLP-1Rs are expressed in the lymphatic vasculature and enriched in LECs. And pharmacological activation by semaglutide enhances the pumping capacity of collectors. onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
GLP‐1 Receptors Are Enriched in the Lymphatic Endothelium and Their Pharmacological Activation With Semaglutide Improves the Pumping Capacity of Lymphatic Vessels
Objectives Recent clinical studies have suggested that glucagon-like peptide-1 receptor (GLP-1R) agonists may be effective therapies to treat or reduce the risk of developing secondary lymphedema. I.....
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Osama Harraz @osamaharraz.bsky.social · 25/04/2026
Pew Latin American Fellows Program: Remarkable opportunity for Latin America🌎researchers to pursue postdoctoral training in the US. ➡️ If you consider applying and your interests connect with ours (www.HarrazLab.com), I’d be glad to explore if I could serve as a sponsor. www.pew.org/en/projects/...
pew.org
Pew Latin American Fellows
The Pew Latin American Fellows Program in the Biomedical Sciences provides support for young scientists from Latin America to receive postdoctoral training in the United States. The program gives thes...
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Reposted by Osama Harraz
APS Publications @apspublications.bsky.social · 07/04/2026
Check out this great review by Osama Harraz et al., Brain Capillary Ion Channels: Physiology and Channelopathies ➡️ ow.ly/Jenc50YCOSA #BrainCapillaries #IonChannels
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Pablo J. Sáez @pjsaez.bsky.social · 27/01/2026
Very hot from the press ! Almost every topic we work in: #IonChannels #Leukocytes #CalciumSignaling T cell response depends on target-cell stifness to drive Piezo1- Orai1 membrane channels activation, softening of tumours prevents this response. Full www.science.org/doi/10.1126/... @science.org
science.org
T cell polarization and NFAT activation are stiffness dependent and differentially regulated by the channels PIEZO1 and ORAI1
Target stiffness influences T cell polarization and gene expression through distinct Ca2+ channels.
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Reposted by Osama Harraz
Science X / Phys.org @sciencex.bsky.social · 06/02/2026
Activation of the Piezo1 ion channel in a mouse model of Alzheimer's disease restored brain blood flow and improved neurovascular function, suggesting potential for future therapeutic strategies. doi.org/hbnvgf
medicalxpress.com
Preclinical study successfully reverses loss of blood flow to brain, an early sign of Alzheimer's disease
Supriya Chakraborty might have been studying insects in a lab had it not been for an immunology college instructor in India who taught him about the superheroes inside him—immune cells that wage a battle against bacteria, parasites, and a host of other adversaries that invade our bodies.
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Eric Mulhall @ericmulhall.bsky.social · 05/03/2026
Very excited to share our new manuscript – published today! Why are PIEZO1 and PIEZO2 are tuned to transduce different types of mechanical force? I was lucky to work with some extraordinary colleagues to begin to figure out why. www.nature.com/articles/s41... An overview of the results below ⬇️ ⬇️
nature.com
The molecular basis of force selectivity by PIEZO2 - Nature
PIEZO2 is intrinsically more rigid than PIEZO1, and disparate mechanical stimuli paradoxically evoke opposite conformational and gating responses in each channel.
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Reposted by Osama Harraz
Ardem Patapoutian @ardemp.bskyverified.social · 04/03/2026
New paper from the lab led by @ericmulhall.bsky.social addresses how PIEZO1 and PIEZO2 are tuned to different types mechanical forces. From nanometer-scale super-resolution microscopy to in vivo experiments, links single-molecule observations to physiological function. www.nature.com/articles/s41...
nature.com
The molecular basis of force selectivity by PIEZO2
Nature - PIEZO2 is intrinsically more rigid than PIEZO1, and disparate mechanical stimuli paradoxically evoke opposite conformational and gating responses in each channel.
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Osama Harraz @osamaharraz.bsky.social · 09/04/2026
I am delighted to host Dr. Stephen Liberles @harvardmed.bsky.social @hhmi-science.bsky.social as he presents the Pharmacology Department Seminar today April 9th at the @uvmlarnermed.bsky.social @uvmvermont.bsky.social “Mechanisms of body-brain communication”
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Osama Harraz @osamaharraz.bsky.social · 19/03/2026
Mesmerizing 🧠!
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Reposted by Osama Harraz
The Journal of Physiology @jphysiol.bsky.social · 16/03/2026
This recent study by Bianca Barreira of @ucm.es et al. investigates functional expression of inwardly rectifying and ATP-sensitive #potassium channels in human #pulmonary artery smooth muscle and endothelial cells 🔬 🫀 📜 Read the #Research: physoc.onlinelibrary.wiley.com/doi/10.1113/...
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Osama Harraz @osamaharraz.bsky.social · 20/02/2026
Check out this review on brain 🧠capillary ion channels in health and disease… a topic that has evolved (and continues to grow) dramatically over the past decade.🗓️📅
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Reposted by Osama Harraz
Nimrat Chatterjee @nimratchatterjee.bsky.social · 19/02/2026
Please join us on February 24th for our next installment of the graduate students' CMB seminar! There will be excellent talks and discussions!! @devdoot.bsky.social @uvmcmb.bsky.social @msymeonides.bsky.social @karenglasslab.bsky.social @wargolab.bsky.social @osamaharraz.bsky.social
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Osama Harraz @osamaharraz.bsky.social · 14/02/2026
PIP2 corrects an endothelial Piezo1 channelopathy | PNAS www.pnas.org/doi/10.1073/...
pnas.org
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
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Reposted by Osama Harraz
APS Publications @apspublications.bsky.social · 09/02/2026
🧠🆕Review article: "Brain Capillary Ion Channels: Physiology and Channelopathies." Osama F. Harraz and Ahmed M. Hashad ow.ly/MUCH50YbM0p. #BrainCapillaries #CerebralBloodFlow
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Journal of General Physiology @jgp.org · 02/02/2026
📣 #CallForPapers 📣 on the topic of the inaugural in-person Electrophysiology & Ion Channel (EpIC) meeting, “Emerging Research on Ion Channels in Health & Disease” – w/ Guest Editors Jelena Baranovic, @osamaharraz.bsky.social, Conor McClenaghan, & Lejla Zubcevic 👉 rupress.org/JGP/pages/ca...
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Reposted by Osama Harraz
Journal of General Physiology @jgp.org · 08/08/2025
📣 #CallForPapers 📣 Submit your research on the topic of the inaugural in-person Electrophysiology & Ion Channel (EpIC) meeting, “Emerging Research on #IonChannels in Health & Disease” – w/ Guest Editors Jelena Baranovic, Osama Harraz, Conor McClenaghan & Lejla Zubcevic 👉 rupress.org/JGP/pages/ca...
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Reposted by Osama Harraz
Hao Yin @haoyin.bsky.social · 13/01/2026
Leukocyte stalling in 🐭Retinal microvasculature 2PM In 20 s, "~7% tracked leukocytes stalled for at least one time along their path", up to 9 stalls 87% stalls occur at vessel junctions, where 71% occupied with #Pericyte ⏫RBC flow irregularity #JCBFM 2025 journals.sagepub.com/doi/10.1177/...
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Osama Harraz @osamaharraz.bsky.social · 12/01/2026
😖
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Dementia Researcher @dementiaresearcher.bsky.social · 12/01/2026
My Name is Doddie Foundation Catalyst Awards 2026 are now open. Funding bold early stage MND research ideas with up to £100k to generate data and open new treatment pathways. www.dementiaresearcher.nihr.ac.uk/funding/my-n...
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Osama Harraz @osamaharraz.bsky.social · 30/12/2025
🎉 New Publication in @pnas.org Excited to share our lab’s latest research article: PIP₂ Corrects an Endothelial Piezo1 Channelopathy pnas.org/doi/abs/10.1... (Open Access)
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Science X / Phys.org @sciencex.bsky.social · 22/12/2025
Restoring levels of the phospholipid PIP₂ may help normalize brain blood flow and reduce symptoms in vascular dementia by regulating the activity of the Piezo1 protein.
medicalxpress.com
Key phospholipid points to potential treatment for vascular dementia
A possible new treatment for impaired brain blood flow and related dementias is on the horizon. Research by scientists at the University of Vermont Robert Larner, M.D. College of Medicine provides novel insights into the mechanisms that regulate brain blood flow and highlights a potential therapeutic strategy to correct vascular dysfunction.
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Reposted by Osama Harraz
adamezracohen.bsky.social @adamezracohen.bsky.social · 14/11/2025
When a larval zebrafish twitches its tail, the vascular endothelium lights up with a calcium signal, mediated by Piezo1. We used to think mechanosensing in endothelial cells was about sensing blood flow, but at least in this case it's about sensing body motion.
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Reposted by Osama Harraz
John Tuthill @tuthill.bsky.social · 18/12/2025
Grateful to @pewtrusts.org for funding our snow fly work, in collaboration with Sebastian Brauchi at Universidad Austral de Chile. We are now looking for post-docs to work on the biophysical mechanisms that allow snow fly neurons and muscles to function below zero. newsroom.uw.edu/news-release...
newsroom.uw.edu
Most insects slow down in bitter cold. Not snow flies. - UW Medicine | Newsroom
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Osama Harraz @osamaharraz.bsky.social · 18/12/2025
🧵Excited to share our work with the Bracko @bloodflowlab.bsky.social lab published in Alzheimer's & Dementia @alzassociation.bsky.social : Systemic Piezo1 activation improves cerebrovascular function in Alzheimer’s disease 🔗https://alz-journals.onlinelibrary.wiley.com/doi/10.1002/alz.71016
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The Larner College of Medicine @uvmlarnermed.bsky.social · 19/11/2025
#UVMLarnerMed research publication alert! #Brainresearch by authors Osama Harraz, Ph.D., and Ahmed Hashad, Ph.D., Department of Pharmacology, Larner College of Medicine, Vermont Center for Cardiovascular and Brain Health. @uvmvermont.bsky.social @apspublications.bsky.social
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Osama Harraz @osamaharraz.bsky.social · 19/11/2025
Excited to share the latest from our lab (final version, open access): Brain Capillary Ion Channels: Physiology and Channelopathies Physiology | @apspublications.bsky.social journals.physiology.org/doi/full/10.... @uvmlarnermed.bsky.social
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Cordero-Vásquez Lab @cvlab.bsky.social · 06/11/2025
Our new Journal of Neuroscience paper "Cofilin Inhibition Ameliorates PIEZO2 and AMPA Dysfunction in a Mouse Model of Angelman Syndrome (AS)” is out: www.jneurosci.org/content/45/4... 1/6
jneurosci.org
Cofilin Inhibition Ameliorates PIEZO2 and AMPA Dysfunction in a Mouse Model of Angelman Syndrome
Angelman syndrome (AS) is a neurogenetic disorder characterized by motor coordination and cognitive deficits. In AS, hippocampal neurons show reduced filamentous (F-)actin, a decrease we also reported...
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Cordero-Vásquez Lab @cvlab.bsky.social · 21/10/2025
The Department of Biochemistry and Molecular Biology at UTHealth Houston has an open search for a tenure-track faculty position. If you are ready (or know someone that is) to start looking for positions, this will be a great opportunity to join the Texas Medical Center. See flyer below. 1/2
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The Friedman Brain Institute @sinaibrain.bsky.social · 05/11/2025
NEW STUDY! Building on pioneering work by Dr. Alison Goate, an international team of researchers, led by #IcahnMountSinai's Anne Schaefer, ID'd distinct population of neuroprotective #Microglia that may point to new therapeutic approach for #Alzheimers. @nature.com 👉 www.nature.com/articles/s41...
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Osama Harraz @osamaharraz.bsky.social · 22/10/2025
This is sad, to say the least...
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Ishmail Abdus-Saboor @ishmailsaboor.bsky.social · 08/10/2025
I’m extremely honored to be a recipient of the NIH Director’s Pioneer Award!
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Ishmail Abdus-Saboor @ishmailsaboor.bsky.social · 08/10/2025
Congrats to the winners! Its notable that Omar Yaghi was a refugee. Refugees and immigrants once again making American science great!
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The Larner College of Medicine @uvmlarnermed.bsky.social · 29/09/2025
Last week at the Dean’s Celebration of Excellence in Research, the annual #UVMLarnerMed Research Rally showcased inspiring research by faculty scientists. Learn more about #larnerresearch at go.uvm.edu/lcomresearch #medicalresearch #research @uvmvermont.bsky.social @osamaharraz.bsky.social
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Jeremy Barry PhD @jeremybarry.bsky.social · 26/09/2025
Received a Dean’s excellence in research award and I’m pretty chuffed about it. Thanks to friends, family and colleagues who keep me going.
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The Larner College of Medicine @uvmlarnermed.bsky.social · 12/09/2025
Today, UVM President Marlene Tromp announced that the University of Vermont has named Richard L. Page, M.D., Dean of the Larner College of Medicine, as its inaugural Chief Medical Affairs Officer. Read more: go.uvm.edu/medaffairs @uvmvermont.bsky.social photo: Andy Duback
go.uvm.edu
University of Vermont Names Dr. Richard L. Page as Chief Medical Affairs Officer | Office of Medical Communications | The University of Vermont
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The Friedman Brain Institute @sinaibrain.bsky.social · 11/09/2025
✨VERY EXCITED to share groundbreaking research by Luyue Zhang, Ana M. Franceschi, John Crary, Frank Provenzano✨Here, they suggest a previously unrecognized biomechanical contribution to initiation of tau pathology in aging & sporadic AD. @biorxivpreprint.bsky.social www.biorxiv.org/content/10.1...
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Osama Harraz @osamaharraz.bsky.social · 09/09/2025
We are delighted to welcome Caroline Kehlet to our lab. Caroline is an undergraduate student at UVM double majoring in Anthropology and Neuroscience. Welcome Caroline!
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eLife @elife.bsky.social · 23/08/2025
Membrane Biology: Nothing can replace polyunsaturated lipids Genetic studies reveal that polyunsaturated lipids do more than simply increase the fluidity of the cell membrane. buff.ly/qcLJNUN
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Osama Harraz @osamaharraz.bsky.social · 20/08/2025
The lab crew!
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Schallek Lab @schalleklab.bsky.social · 14/08/2025
#FluorescenceFriday NEUTROPHILS are rare immune cells flowing within trillions of blood cells of the body. Using #AdaptiveOptics cameras, we directly image fluorescent neutrophils in the vessels of the eye doi.org/10.7554/eLif... @flaumeye.bsky.social @cvsuor.bsky.social @urneuroscience.bsky.social
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catie profaci, phd @cprofaci.bsky.social · 08/08/2025
Thrilled to share this amazing work from Marie Blanchette & team in the Daneman Lab!!! We found that differences in the BBB across brain regions help regulate local brain function 🧠 Honored to have contributed to the study & to have had Marie as a mentor during my PhD💕 www.nature.com/articles/s41...
nature.com
Regional heterogeneity of the blood-brain barrier - Nature Communications
The blood-brain barrier (BBB) regulates the extracellular composition of the central nervous system (CNS), but it is not known whether its properties differ across CNS regions. Here, the authors show ...
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Alt NIH Bluesky 🧪 @altnih4science.bsky.social · 06/08/2025
This is amazing. And it's not just math talent: she is a mature communicator now. She blossomed when moving from homeschooling to math communities in Chicago and at Berkeley. This is a story that should inspire us. 🧪
quantamagazine.org
At 17, Hannah Cairo Solved a Major Math Mystery | Quanta Magazine
After finding the homeschooling life confining, the teen petitioned her way into a graduate class at Berkeley, where she ended up disproving a 40-year-old conjecture.
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