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Paraish S. Misra, MD PhD

@paraish.bsky.social
43 followers 49 following 17 posts

Transplant nephrologist Research: pluripotent stem cells • organoids • regenerative med Diabetes, transplantation & kidney disease he/him • Views mine • No medical advice

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Reposted by Paraish S. Misra, MD PhD
American Journal of Transplantation @amjtransplant.bsky.social · 12/08/2026
🔬 Featured in AJT’s August issue! “Donor-reactive clonotypes are overrepresented in the urinary T-cell repertoire during kidney transplant rejection and show distinct dynamics in the circulation,” by Aschauer et al. doi.org/10.1016/j.aj... #KidneyTransplantation #TransplantRejection #TCells
Figure 2 Clonotype counts in urine and circulation.
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Reposted by Paraish S. Misra, MD PhD
Joshua Frenster @joshifrenster.bsky.social · 01/04/2026
🥳 I am happy to share our latest manuscript published in @natcellbio.nature.com We use #Gastruloids to study #CellCompetition during early mammalian development and find not only that this is highly pronounced in our system but also tightly restricted in time. (1/12) www.nature.com/articles/s41...
nature.com
Mosaic gastruloids reveal a temporal restriction for developmental cell competition - Nature Cell Biology
Frenster et al. utilize mosaic mouse gastruloids as a model of cell fitness and competition, identifying a temporal window between primed pluripotency and early gastrulation during which cell competit...
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Reposted by Paraish S. Misra, MD PhD
Daniel Drucker @danieljdrucker.bsky.social · 22/03/2026
Insights from derivation of human IPS #stemcell derived islet-like or off-target enterochromaffin (EC)-like cells in the pancreas #diabetes www.nature.com/articles/s41...
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
Grateful for funding from #CIHR-IRSC #UHNfoundation #HowardWebsterFoundation #BreakthroughT1D #KFoC #KRESCENT #UofT_DOM #CSTP #CST_transplant @cirtn.bsky.social @bbdc-uoft.bsky.social @czechacademy.bsky.social #CzechScienceFoundation This work wouldn’t be possible without their support.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
14/14 This project was a long, shared labour of love. Huge gratitude to the brilliant team who carried it forward, and to our friends in the Pavlinkova lab, whose elegant in vivo ISL1-CKO experiments were key to revealing the pancreatic EC story.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
13/14 Overall, we find that 1) EC-like cells can arise from well specified pancreatic progenitors, and 2) Tuning progenitor state plus endocrine patterning can be used to build “designer” hPSC-islets with defined endocrine mixes. There’s more in the paper, and much more yet to be discovered…
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
12/14 To probe mechanism, we compared endocrine specification under beta vs EC patterning. Most markers behaved similarly, but NGN3 stood out: it was transient with beta and persisted with EC patterning. ISL1-KO murine pancreatic EC-like cells also showed sustained Neurog3 expression.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
11/14 High-NKX6-1 progenitors did what we expected: under beta patterning they formed beta enriched islet like clusters. Low-NKX6-1 progenitors made more alpha- and EC-like cells under those respective conditions. Surprisingly, with beta patterning, they generated the most delta-like cells.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
10/14 We then re-explored the importance of early progenitor patterning. We generated PDX1+ progenitors with different NKX6-1 expression levels (low, medium, or high NKX6-1), and exposed each to endocrine patterning protocols we designed to favour beta-, alpha-, or EC-like cells.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
9/14 Back in our stem cell–derived islets, we dissected endocrine‑stage media. MEK and BMP inhibitors strongly biased endocrine progenitors toward EC‑like cells, especially together. In contrast, FGF2, Betacellulin, or BMP4 reduced EC‑like cells and boosted islet markers.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
8/14 In the gut, EC fate is blocked by ISL1. We thus studied a mouse where ISL1 is deleted after pancreatic specification occurs. These islets also developed abundant EC-like cells, revealing that pancreatic progenitors have latent EC-forming potential even in vivo.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
7/14 But when we differentiated these progenitors into endocrine cells, EC-like cells still emerged at high frequency. Improving pancreatic identity alone was not enough to block the EC fate.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
6/14 Next, we thought that “better” pancreatic progenitors would suppress off-target fates. Refining early endoderm patterning gave us >90% PDX1+NKX6 1+ progenitors by day 13 - a seemingly pancreas-committed population.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
5/14 This boosted downstream pancreatic progenitors and beta-like cells. Similar findings were recently reported by the Millman lab, showing that LatA can also improve endoderm and reduce EC-like cells in hPSC-islet differentiation. Preprint 👉 doi.org/10.1101/2024...
doi.org
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
4/14 We first improved the earliest step: helping pluripotent stem cells cleanly exit pluripotency and become definitive endoderm. To counteract high-density effects, we used a short Latrunculin A (LatA) pulse, which made primitive streak and endoderm formation more uniform.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
3/14 These cells express SLC18A1, a marker normally found in EC cells of the gut, not in islet cells. First highlighted in hPSC-islets by Douglas Melton’s group, they may alter graft behavior and add uncertainty for therapies. Original report 👉 doi.org/10.1038/s415...
doi.org
Charting cellular identity during human in vitro β-cell differentiation - Nature
Single-cell transcriptional profiling of in vitro human pancreatic β-cell differentiation reveals progenitor and terminal fates, produces a detailed time course of endocrine induction and underpins a ...
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
2/14 For diabetes therapy, we want stem cell-derived islets packed with functional beta cells and predictable numbers of other endocrine cells, without off-target lineages. Yet many hPSC-islet protocols generate abundant EC-like cells for unclear reasons.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/03/2026
Excited to share our new paper in Nat Comms on how human stem cell-derived pancreatic progenitors choose between islet and enterochromaffin (EC)-like fates - and how we can steer that choice! A story in a few tweets… Full paper 👉 doi.org/10.1038/s414...
doi.org
Efficient control of enterochromaffin versus islet differentiation from human pluripotent stem cell-derived pancreatic progenitors - Nature Communications
How different islet lineages emerge within pancreatic islets remains largely unknown. Here, using hPSC and mouse models, the authors identify mechanisms that influence islet versus enterochromaffin li...
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Reposted by Paraish S. Misra, MD PhD
Amanda Oakie @aoakie.bsky.social · 18/03/2026
Hot off the press! This paper provides protocols for directed differentiation of hPSCs to different pancreatic islet-like endocrine cells as well as to enterochromaffin cells. Congratulations to the whole team! www.nature.com/articles/s41...
nature.com
Efficient control of enterochromaffin versus islet differentiation from human pluripotent stem cell-derived pancreatic progenitors - Nature Communications
How different islet lineages emerge within pancreatic islets remains largely unknown. Here, using hPSC and mouse models, the authors identify mechanisms that influence islet versus enterochromaffin li...
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Reposted by Paraish S. Misra, MD PhD
CIRTN-R2FIC @cirtn.bsky.social · 19/03/2026
(🧵10/18) Works from Feb+March 2026🍀. From Dr. M. Cristina Nostro: “Efficient control of enterochromaffin versus islet differentiation from human pluripotent stem cell-derived pancreatic progenitors” PMID 41851084 www.nature.com/articles/s41...
nature.com
Efficient control of enterochromaffin versus islet differentiation from human pluripotent stem cell-derived pancreatic progenitors - Nature Communications
How different islet lineages emerge within pancreatic islets remains largely unknown. Here, using hPSC and mouse models, the authors identify mechanisms that influence islet versus enterochromaffin li...
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Reposted by Paraish S. Misra, MD PhD
Dr Peter Senior @islettx.bsky.social · 05/06/2025
So excited to hear about Hypoimmune islet transplants from Sonja Schrepfer from Sana Biotechnology - without immunosuppression Is this the future for cell therapy in diabetes? @albertadiabetes.bsky.social celebrating the 25th anniversary of the Edmonton Protocol #25EP
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Reposted by Paraish S. Misra, MD PhD
Joel Topf @kidneyboy.bsky.social · 02/06/2025
Some chapters are harder to get out that others. This was like birthing an elephant. But it's great. Channel your enthusiasm: Chapter 19 part 1, Metabolic Acidosis www.rosebook.club/episodes/202...
rosebook.club
Chapter Nineteen, Part 1: Metabolic Acidosis, The Show — Channel Your Enthusiasm
Chapter 19: Metabolic Acidosis. Part One, The Show
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Paraish S. Misra, MD PhD @paraish.bsky.social · 30/05/2025
Pretty exciting! I wonder how long the effect will last…
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Reposted by Paraish S. Misra, MD PhD
American Journal of Transplantation @amjtransplant.bsky.social · 30/05/2025
Article In Press! Can gene therapy help prevent rejection? AAV-mediated PD-L1 delivery during cold storage was associated with reduced acute rejection in a rat lung transplant model. www.amjtransplant.org/article/S160...
amjtransplant.org
Adeno-Associated Virus-Mediated Transduction of PD-L1 in a Rodent Lung Transplant Model
Acute cellular rejection (ACR) is a key contributor to chronic lung allograft dysfunction (CLAD) following transplantation; while treatable, traditional immunosuppressive (IS) therapies are associated...
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Reposted by Paraish S. Misra, MD PhD
Daniel Drucker @danieljdrucker.bsky.social · 27/05/2025
Well done! Congrats from the east 😎
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Reposted by Paraish S. Misra, MD PhD
Sarah Crome @sarahcrome.bsky.social · 26/05/2025
🧬 Excited to share our latest study now In Press: In this study led by rising star @sarahcolpitts.bsky.social, we show that IL-10⁺ #ILC2s prevent rejection and improve islet graft survival and function in humanized mouse models. Read more: doi.org/10.1016/j.aj... #Immunology #ImmunoSky #CellTherapy
doi.org
Redirecting
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Reposted by Paraish S. Misra, MD PhD
Swapnil Hiremath 🍁🇨🇦 @hswapnil.medsky.social · 25/05/2025
Interesting anecdote when a patient shows up with a ChatGPT differential diagnoses list 😏 www.ajkd.org/article/S027... @ajkd.bsky.social
ajkd.org
Adapting to Artificial Intelligence in Nephrology Practice
I am an academic nephrologist practicing for more than 10 years in a tertiary medical center. A 55-year-old man presented to my clinic with concerns about poor appetite and abnormal kidney function pe...
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Reposted by Paraish S. Misra, MD PhD
Daniel Drucker @danieljdrucker.bsky.social · 23/05/2025
A greater understanding of hypoxia’s impact on stem cell-derived #islets offering a potential intervention for clinical applications #T1D @natcomms.nature.com www.nature.com/articles/s41...
nature.com
Improving cellular fitness of human stem cell-derived islets under hypoxia - Nature Communications
Hypoxia impairs the efficacy of stem cell-derived islet cell therapy, making it a potential barrier for treatment of type 1 diabetes. Wang et al. identify EDN3 as a key factor that preserves β cell id...
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Reposted by Paraish S. Misra, MD PhD
Ajmera Transplant Centre UHN @transplant-uhn.bsky.social · 21/05/2025
📢 Register now! Annual Transplant Research and Education Conference 📅Thurs June 5, 2025 - Fri June 6, 2025 📍Toronto (Virtual option available) More details and to register: bit.ly/ATCEduResDay @uhn.ca @uhnresearch.ca @uoftmedicine.bsky.social #education #transplant #research
ATC Research and Education Conference asset featuring keynote speakers June 5 and June 6, 2025.
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Reposted by Paraish S. Misra, MD PhD
Swapnil Hiremath 🍁🇨🇦 @hswapnil.medsky.social · 23/05/2025
Recording up on our channel now youtu.be/e85gl9RydBM #NephGR #NephSky
youtu.be
Precision Diagnostics and Discovery for Diabetic Kidney Disease with Dr Justin Chun
YouTube video by Ottawa Nephrology
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Reposted by Paraish S. Misra, MD PhD
Dr Peter Senior @islettx.bsky.social · 15/05/2025
Excited to enroll our first participant for testing an agent (tolimidone) we hope will promote beta cell regeneration, building on preclinical work from Dr Jean Buteau at @albertadiabetes.bsky.social. Supported by Alberta Diabetes Foundation & biodexa pharmaceuticals www.ualberta.ca/en/folio/202...
ualberta.ca
Could a pill cure diabetes? A U of A researcher is working on it
A simple pill to treat or even cure diabetes could be possible, thanks to University of Alberta research — and funding that is laying vital groundwork.
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Paraish S. Misra, MD PhD @paraish.bsky.social · 20/05/2025
Although a lot of work still to do, a great step forward for pluripotent stem cell-based therapies for kidney disease!
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