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Jonathan Kagan

@jkagan1.bsky.social
936 followers 30 following 216 posts

Scientist at Boston Children's Hospital, Professor at Harvard Medical School, Husband, Father

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Reposted by Jonathan Kagan
Daniel Fisch @danielhfisch.bsky.social · 02/10/2026
Yesterday was a special day in my career: I got to open the door to my own research group (and for the first time in my life to my own office 😂)! Thank you to @gimminstitute.bsky.social for giving me this opportunity, it's exciting to finally be here!
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Jonathan Kagan @jkagan1.bsky.social · 25/09/2026
Thank you to Boston Children’s Hospital for highlighting our recent publication, describing: Receptor Free Signal Transduction. www.childrenshospital.org/newsroom/med...
childrenshospital.org
Receptor-free signal transduction: Discovery of new method for inflammatory cell communication opens door for therapeutic opportunities in treating autoimmune diseases | Boston Children's Hospital
BOSTON, MA [Sept. 23, 2026] — Our understanding of how cells interact with each other has been driven for decades by the central concept of receptor-mediated
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Harmit Singh Malik @harmitmalik.bsky.social · 23/09/2026
Then and Now: The Rapid Evolution of Harmit Malik www.the-scientist.com/then-and-now...
the-scientist.com
Harmit Malik Dives Into Viral Evolution and Speciation | The Scientist
Fascinated by evolution and driven by curiosity, Malik studies everything from viruses to Drosophila and, like his research subjects, is constantly reinventing himself.
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Jonathan Kagan @jkagan1.bsky.social · 23/09/2026
Today, the Toll-like Receptors reveal a new mechanism of signal transduction: Receptor-Free Signal Transduction. www.nature.com/articles/s41...
nature.com
TRAM promotes Toll-like-receptor-free myddosome signal transduction - Nature
TRAM is a regulator of myddosome assembly through dissociating MyD88 from the TLR–TIRAP complex to enable myddosome maturation and durable downstream signal transduction.
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Jonathan Kagan @jkagan1.bsky.social · 23/09/2026
A metabolic regulator in neurons controls allergic inflammation. Fascinating and important study by Sokol and colleagues key insight to a growing health problem. Kudos to the authors. www.cell.com/immunity/ful... @carriesokol.bsky.social
cell.com
Sensory neuronal mTORC1 kinase signaling establishes neuroimmune memory that initiates allergic immunity
How cumulative environmental allergen exposures are encoded by peripheral sensory neurons to shape immune responsiveness is unclear. Zhu et al. show that protease allergens induce an mTORC1-dependent,...
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Jonathan Kagan @jkagan1.bsky.social · 22/09/2026
In 2024, we found small MyD88 clusters called proto-myddosomes forming around TLRs (link below). These clusters are released to build large signaling myddosomes. Is MyD88 release important for TLR signaling? To answer this question, we need to identify a regulator. Stay tuned...
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Jonathan Kagan @jkagan1.bsky.social · 22/09/2026
A hallmark of the TLR pathways is the expression of primary and secondary response genes, which are subject to distinct levels of regulation. But all instructive information in the nucleus emanates from the receptors. What happens at the receptor to control these events?
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Jonathan Kagan @jkagan1.bsky.social · 21/09/2026
The famous oscillations of NF-kB that govern TLR-induced gene expression are well-documented. What controls these oscillations and are they important for inflammatory cytokine production?
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Jonathan Kagan @jkagan1.bsky.social · 21/09/2026
For over 20 years, the Toll-like Receptor pathway has been divided into proteins that control MyD88 and TRIF signaling events. Are these pathways really separate entities, with the only common receptor-proximal node being the receptor itself?
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Jonathan Kagan @jkagan1.bsky.social · 02/09/2026
Change the textbooks. Trans-splicing as a means to diversify the proteome. Many congrats to Ruaidhri Jackson and Olivia Venezia on this remarkable discovery. www.nature.com/articles/s41...
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Nature Reviews Immunology @natrevimmunol.nature.com · 24/08/2026
Can immunology still surprise itself?
dlvr.it
Can immunology still surprise itself?
Nature Reviews Immunology, Published online: 24 August 2026; doi:10.1038/s41577-026-01351-wThe discoveries that have transformed immunology often seem obvious in retrospect. Yet none began as an inevitable destination. They began with observations that did not fit, assumptions that somebody challenged, or questions that nobody yet realized were important. Discovery was the outcome. Surprise was the process.
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Caetano Reis e Sousa @reisesousalab.bsky.social · 19/08/2026
Hope you enjoy this short piece, which came out yesterday. Some thoughts I’ve been musing on for a while about why adaptive immunity evolved. Read it for free at rdcu.be/fAO5P
rdcu.be
Why adaptive immunity?
Nature Reviews Immunology - Adaptive immunity is indispensable to vertebrates, yet most living organisms defend themselves perfectly well without it. Here, I ask why somatically diversified antigen...
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Ivan Zanoni @lozanzi.bsky.social · 14/08/2026
#DAMPsPower!! Excited to share the 💥new 💥 review @ Science Immunology that @marcodigioia & I wrote about the immunological activities played by host-derived oxidized lipids in controlling infections & tumorigenesis! doi.org/10.1126/scii...
doi.org
Regulation of inflammation by oxidized lipids
Lipids generated by oxidative stress and their effects on immunity and cancer are reviewed.
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Kranzusch Lab @kranzuschlab.bsky.social · 12/08/2026
The shared principles of human and bacterial antiviral immunity An honor to highlight remarkable discoveries from many labs over the past 12 years that unite previously disparate fields of how animal cells and prokaryotes defend against viruses. www.nature.com/articles/s41... rdcu.be/fzwyB
nature.com
Shared principles of human and bacterial antiviral immunity - Nature
The Review describes shared ancient, conserved mechanisms between human antiviral immunity and bacterial anti-phage systems, outlining universal principles of pathogen sensing, signalling and effector...
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Caetano Reis e Sousa @reisesousalab.bsky.social · 06/08/2026
Delighted that our work led by @marianapdc.bsky.social has just been published in @cp-cellreports.bsky.social. Read it for free at www.cell.com/cell-reports...
cell.com
CXCR4 marks homeostatically activated dendritic cells in the steady state and in cancer
Pereira da Costa et al. define CXCR4 as a marker of dendritic cell activation in the steady state and in cancer, which is absent in activation elicited by Toll-like receptors or type I interferon rece...
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Jonathan Kagan @jkagan1.bsky.social · 05/08/2026
Evidence continues to accumulate that dendritic cell activation state is as important as antigens in anti-tumor immunity. A new study confirms CCR7 DCs as key drivers of defense. www.cell.com/immunity/ful...
cell.com
CCR7+ activated dendritic cells are essential for spontaneous and immunotherapy-driven anti-tumor immunity
Dendritic cells (DCs) can acquire distinct functional states. To examine how different DC states orchestrate anti-tumor immunity, Koufaki et al. develop mouse models to label and ablate CCR7+ DCs and ...
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Jonathan Kagan @jkagan1.bsky.social · 04/08/2026
Highly recommend!
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Kat Barnett @katbarnett.bsky.social · 27/07/2026
Had so much fun writing this commentary for #msphere! Grateful for the opportunity to write about work that’s shaped my perspective on innate immunity and RNA virus infection journals.asm.org/doi/10.1128/...
journals.asm.org
mSphere of Influence: Damage in RNA virus infection—a feature or a bug? | mSphere
How does the body recognize viral infection? How do viruses engage the immune system during replication? These seemingly simple questions led me to study pattern recognition, a concept first proposed ...
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Jonathan Kagan @jkagan1.bsky.social · 17/07/2026
A new PAMP, a new innate immunity principle and a new preclinical application. I am so pleased to share our study on STING activation mechanisms in health and disease. Led by the fantastic Stephanie Ragland, follow the link below for a summary of all we learned. www.cell.com/immunity/ful...
cell.com
Purine and pyrimidine-based bacterial cyclic dinucleotides egress the phagosome and activate the innate immune sensor STING
Innate immune recognition of bacteria is thought to center on cell-surface or endosomal pattern recognition receptors such as TLRs. Ragland et al. identify an intraphagosomal cyclic dinucleotide (CDN)...
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Dr. Sunny Shin @sunnyshinlab.bsky.social · 17/07/2026
Amazing week of science & camaraderie at GRC Microbial Toxins & Pathogenicity! Many thanks to chair @torreslab.bsky.social & the discussion leaders, speakers, poster presenters, attendees, & staff for an awesome meeting! Excited to organize the next one with new vice-chair @sauerlab.bsky.social!
Photo of Sunny Shin & Victor TorresPhoto of Waterville Valley
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Jonathan Kagan @jkagan1.bsky.social · 16/07/2026
A query: cGAS, STING, AIM2, NODs, NLRs, RLRs: All these PRRs are categorized as pathogen sensors, because they reside in the cytoplasm. In contrast, TLRs sense non-pathogens and pathogens. How confirmed is this dogma, beyond the usual (small) set of pathogens that we all study?
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Jonathan Kagan @jkagan1.bsky.social · 16/07/2026
Cyclic dinucleotide (CDN) transporters have been studied primarily with pure STING ligands. Yet, most CDNs are not floating around in the extracellular space; they are hidden inside bacteria. I wonder what CDN transporters do in the context of infection.
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Jonathan Kagan @jkagan1.bsky.social · 15/07/2026
Has anyone studied the role of STING in genetically engineered mouse models (GEMM) of cancer, or are we still only using implantable tumors?
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Jonathan Kagan @jkagan1.bsky.social · 14/07/2026
A query for the immunologists: Are there any PAMPs left to discover?
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Reposted by Jonathan Kagan
Ivan Zanoni @lozanzi.bsky.social · 22/05/2026
#InterferonPower #InflammasomePower! Thrilled for our 💥#NewPaper💥 @natimmunol.nature.com spearheaded by Kautilya Jena showing that our #fungal adjuvant #Mannadjuvant prolongs & potentiates protection of mRNA vaccines via #IL1b & #IFNs, broadening it to new variants & overcoming antigenic imprinting!
rdcu.be
A glycan-based adjuvant expands the breadth and duration of protection of mRNA-based vaccines
Nature Immunology - Jena, Qu et al. show that mannadjuvant, a formulation of fungal mannan and aluminum hydroxide, increases the magnitude, durability and breadth of the response elicited by...
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Waggoner Lab @labwaggoner.bsky.social · 24/05/2026
A glycan-based adjuvant expands the breadth and duration of protection of mRNA-based vaccines www.nature.com/articles/s41... @lozanzi.bsky.social @harvardmed.bsky.social @natimmunol.nature.com
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Ivan Zanoni @lozanzi.bsky.social · 27/04/2026
More than thrilled to share that I’ve been promoted to full (tenured) Professor @harvardmed.bsky.social @harvard.edu! This only happened because of the hard work of many people, but I want to dedicate this promotion to my grandmas, Nonna Maria & Nonna Vevè. A #FirstGen thread 🧵 1/x
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Kuchroo Lab @kuchroolab.bsky.social · 25/04/2026
An adaptive source of IL-17A/F is indispensable for EAE induction! And B cell-derived IL-17 induces IL-23 signaling required to convert stem-like Th17 cells to encephalitogenic Th17 cells. www.science.org/doi/10.1126/...
science.org
An adaptive cellular source of IL-17A and IL-17F is critical for the induction of experimental autoimmune encephalomyelitis
B cells are a critical adaptive immune cell type in the development of TH17 cell–mediated experimental autoimmune encephalomyelitis.
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Harmit Singh Malik @harmitmalik.bsky.social · 13/04/2026
I was interviewed by @katiepickup.bsky.social recently for @dmmjournal.bsky.social. This has a little bit of my background, a little bit on science and mentoring, and a little bit (ok, more than a little bit) on funding in science. Check it out at: journals.biologists.com/dmm/article/...


How important do you feel discovery research and ‘basic’ science is for understanding disease?

Well, I have a little bit of a biased view on the topic, since I'm a basic scientist myself. The lab has made more and more discoveries with very strong therapeutic implications, and often people ask me why we are not pursuing these further ourselves. Part of it is that I think about this very much as an ecosystem. People have different skills – I have colleagues who are very good at the application side of things and I have other colleagues, including people in my lab, who are very good at the basic science. There are a lot of very smart people at every stage in the ecosystem and, sometimes, we have to acknowledge that we can't all be experts in every step. A lot of basic science discoveries will end up having profound implications in the clinic – if you don't have the full imagination about how to get it there, that's okay, because you're still a very important piece of the jigsaw puzzle and other people can help. If the basic science discoveries didn't exist, then it's quite possible that the well would run dry. We cannot simply rely on the idea that the therapies currently in clinical trials are going to be enough because we already know that – for diseases, such as cancer, and with rapidly evolving viruses – there needs to be a constant influx of new ideas to stay ahead of the arms race. I'd also make a plug for the fact that, ultimately, we are all interested in human disease, but disease research in humans is not ethical or possible. This is why creating and studying model organisms in a high-throughput, low-investment context is incredibly important. We cannot just say ‘okay, we're going to stop work on anything that is not related to human research’, because – actually – it's all relevant to humans.


Do you think basic science is particularly threatened by cuts to funding?

Science itself is quite uncertain. We do experiments wondering if they will even work. It's discovery, and you don't know where it's going to lead. It could lead to a billion-dollar company, something like mRNA vaccines or CRISPR-Cas9 gene editing, or it could simply be something that interests you. Sometimes it might appear esoteric from the outside, but there are very smart people dedicated to this work. We shouldn't lose sight of the fact that most of this work is paid for by taxpayers, but funding uncertainty creates a very unstable foundation. If the foundations are weak, people are going to get much more conservative about the science that they're doing and worry that ‘blue-skies research’ is not worth pursuing because it won't get funded. And that would be a mistake because all innovation in science really originates from blue-skies, basic research. The second thing that uncertainty does is send a message to our young trainees – who are our future – that this is not a career option that will provide professional and personal stability. I worry that this kind of uncertainty will mean we lose an entire generation of people, and that would be a loss we might not be able to overcome.
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Kat Barnett @katbarnett.bsky.social · 08/04/2026
I've gotten lots of questions about our co-culture systems to study epithelial-immune interactions in viral infections, so wrote a step-by-step guide! I hope this will help anyone looking to adapt these protocols for their research. currentprotocols.onlinelibrary.wiley.com/doi/abs/10.1...
currentprotocols.onlinelibrary.wiley.com
Co‐Culture Systems to Study Epithelial‐Immune Interactions During SARS‐CoV‐2 Infection
Robust inflammatory responses to viral infection are mediated by immune cell populations, including monocytes and dendritic cells. However, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2...
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Jonathan Kagan @jkagan1.bsky.social · 12/03/2026
Want to know how cancer vaccines can keep you alive? Very pleased to join several luminaries in the field to offer a comprehensive review on this important topic. @harvardmed.bsky.social @bostonchildrens.bsky.social #cancer #vaccine www.nature.com/articles/s41...
nature.com
Clinical development of cancer vaccines - Nature Medicine
This Review highlights insights from recent clinical trials and discusses critical factors for optimizing cancer vaccines, with a focus on proxies for vaccine efficacy, neoantigen selection, modular p...
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Dr. Sunny Shin @sunnyshinlab.bsky.social · 28/02/2026
Please join us for the Cold Spring Harbor Asia @cshlnews.bsky.social meeting on Bacterial Infection & Host Defense this May 11-15 in Suzhou, China! We have a fantastic lineup of speakers. Abstract deadline is March 6. Hope to see you there!
Poster of the 2026 CSHA meeting on Bacterial Infection & Host Defense.
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Jonathan Kagan @jkagan1.bsky.social · 28/02/2026
Increasing evidence that STING has functions beyond DNA viruses. A new study reports that STING restricts influenza infection, independently of IFN. This work complements prior studies that STING prevents infection with diverse RNA viruses. www.science.org/doi/10.1126/...
science.org
STING–NF-κB signaling builds an influenza spillover barrier
Influenza pandemics are often traced back to the spillover of avian influenza A viruses (IAVs) to humans. However, barriers against IAV transmission remain elusive. We demonstrated human stimulator of...
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Inflammasome Lab @inflammasomelab.bsky.social · 19/02/2026
Poster deadline is approaching for @keystoneSymposia.bsky.social #InnateImmunity: Diversity in #HostDefense & Disease, this March in Banff! See scholarship, abstract and registration: keysym.us/KSInnateImmune26 #KSInnateImmune26 @jkagan1.bsky.social @brozlab.bsky.social
keysym.us
Innate Immunity: Diversity in Host Defense and Disease | Keystone Symposia
Join us at the Keystone Symposia on Innate Immunity: Diversity in Host Defense and Disease, March 2026, in Banff, with field leaders!
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Jakub Began @jakubegan.bsky.social · 16/02/2026
PAPER ALERT! I am excited to share that our study describing the molecular mechanism of caspase-4 activation has just been published in Immunity. www.cell.com/immunity/ful... I would like to thank all the co-authors for their valuable contributions. Well done guys! Link for short summary below👇
cell.com
Caspase-4 binds to LPS membranes with positive curvature for non-canonical inflammasome activation
The cytosolic LPS sensor caspase-4 controls antibacterial immunity by inducing pyroptosis and cytokine secretion. Began et al. show how remodeling of LPS membranes by interferon-induced GTPase GBP1 pr...
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Jonathan Kagan @jkagan1.bsky.social · 06/02/2026
Too much data, too little thinking. A important essay from Ruslan Medzhitov on the importance of understanding data, not just generating it. A must read. @Yale www.nature.com/articles/s41...
nature.com
On the balance of knowledge - Nature Reviews Immunology
Ruslan Medzhitov shares his thoughts on the balance between generating data and developing theories in immunology, with a focus on exploring the rules that govern complex systems.
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The American Association of Immunologists @aai.org · 05/02/2026
🌟 Congratulations to the 2026 Class of Distinguished Fellows of AAI (DFAAI)! From groundbreaking research to dedicated service, these members represent the pinnacle of the immunology field. Check out this year’s honorees: bit.ly/DFAAI2026. #DFAAI #Immunology #ScienceExcellence
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Jonathan Kagan @jkagan1.bsky.social · 05/02/2026
A fantastic innate immunity conference coming soon. Join us! youtu.be/xmQv36uYm7s?...
youtu.be
Innate Immunity Meeting Promo
YouTube video by KeystoneSymposia
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Sri Narasimhan @snarasimhan.bsky.social · 03/02/2026
Cell is hiring! Do you have a background in #neuroscience or #immunology? Better still, #neuroimmunology? Cell has an opening for a full-time scientific editor. Role will be based out of any one of our offices in Medford, MA, UK, Spain, Netherlands, China tinyurl.com/4ma236xn @cp-cell.bsky.social
nam11.safelinks.protection.outlook.com
Scientific Editor, Cell
Cell has an opening for a full-time scientific editor. If you are a passionate, mission-driven team player who loves thinking broadly about science and wants to have a positive impact, we invite you t...
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Sri Narasimhan @snarasimhan.bsky.social · 29/01/2026
Today at Cell: A new #HallmarksofCancer review by Doug Hanahan: www.cell.com/cell/fulltex... This review marks 25 years since the original seminal Cell review by Hanahan & Robert Weinberg and its impactful follow up in 2011. @cp-cell.bsky.social @cellpress.bsky.social
cell.com
Hallmarks of cancer—Then and now, and beyond
Hanahan revisits the evolving framework of cancer hallmarks, synthesizing 25 years of conceptual refinement into a multidimensional view of tumor biology. This review highlights how aberrant capabilit...
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Keystone Symposia @keystonesymposia.bsky.social · 20/01/2026
🎓 Early-career scientists - don’t miss out! Register by Jan 21 (11:59 PM MST) for the joint Keystone Symposia on Innate Immunity & Aging. Save $250 and attend two meetings for the price of one. 🔗 keysym.us/KSInnateImmu... 🔗 keysym.us/KSAging26 @jkagan1.bsky.social #KSInnateImmune26 #KSAging26
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Kevin Bonham @kevinbonham.com · 17/01/2026
Been hearing some horrifying chatter about dealing with the new #NIH common form and #ScienCV system, so I put together a short video with some tricks for mitigating some of those pain points. Hope it helps? 🧪 open.substack.com/pub/emptymod...
open.substack.com
Dealing with ScienCV formatting
Some tips for composing and making your new NIH biosketch not look like garbage
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The American Association of Immunologists @aai.org · 15/01/2026
What goes into planning the world's largest all-immunology event? Join AAI President Dr. Uli von Andrian and Program Chair Dr. Shekhar Pasare for a preview of #IMMUNOLOGY2026™! 🧬 Presidential Symposium 🔬 Special Sessions 🎓 Trainee Programs 🔗 immunology2026.aai.org
immunology2026.aai.org
Home - IMMUNOLOGY2026™
IMMUNOLOGY2026™ is the 109th annual meeting of the American Association of Immunologists, April 15-19, 2026 in Boston, MA.
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Ivan Zanoni @lozanzi.bsky.social · 07/01/2026
#CyclopsPower👁️ Lu, Choi, Huh &co describe @cp-cell.bsky.social a new reporter system to detect cells that respond to a cytokine & utilize it to identify ileal epithelial cells that respond to IL17 or IFNg responsive CD8 T cell within tumors which are hypofunctional!
sciencedirect.com
In vivo detection of immune responses via cytokine activity labeling
While much is known about the identity and regulation of cytokine-producing cells, the cell types that respond to cytokines remain largely uncharacter…
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Ivan Zanoni @lozanzi.bsky.social · 05/01/2026
💥New paper alert!💥 What’s better than starting 2026 with an @annualreviews.bsky.social #Immunology, often a once-in-a-life honor ❤️?! Check it out if you want to know everything about type III interferons #IFN! Thanks to my wonderful team for their amazing work 🤗 doi.org/10.1146/annu...
doi.org
Molecular, Cellular, Tissue, and Organismal Functions of Type III Interferons
Type III interferons are essential immune mediators playing pleiotropic roles during health and disease. In this review, we highlight the molecular and cellular pathways that lead to the production of...
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Inflammasome Lab @inflammasomelab.bsky.social · 01/01/2026
Working with a great team to organize @keystoneSymposia.bsky.social #InnateImmunity : Diversity in #HostDefense & Disease, this March! Join us to explore emerging research in Banff! keysym.us/KSInnateImmune26 #KSInnateImmune26
keysym.us
Innate Immunity: Diversity in Host Defense and Disease | Keystone Symposia
Join us at the Keystone Symposia on Innate Immunity: Diversity in Host Defense and Disease, March 2026, in Banff, with field leaders!
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Jonathan Kagan @jkagan1.bsky.social · 28/12/2025
Harvard profiles the discovery of how inflammatory caspases detect bacterial infection. And how our own lipids bind caspases in the same manner. Kudos to Anh Cao, who made these discoveries. @harvardmed.bsky.social @harvard.edu gsas.harvard.edu/news/crackin...
gsas.harvard.edu
Cracking the Code of Immunity
Immunologists have long studied how our body fights pathogens, but the precise patterns of molecules required to trigger an immune response weren’t fully understood. As a PhD student, Anh Cao took the...
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Jonathan Kagan @jkagan1.bsky.social · 24/12/2025
www.forbes.com/sites/johnwe...
forbes.com
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Daniel Fisch @danielhfisch.bsky.social · 23/12/2025
1/2: YouTube knows what I was up to last summer: www.youtube.com/watch?v=UV7r... Many thanks again to @hfspo.bsky.social for inviting me to the Awardees Meeting in Melbourne this July 😁
youtube.com
MOLECULAR DEFINITION OF THE ENDOGENOUS TOLL-LIKE RECEPTOR SIGNALING PATHWAY
YouTube video by HFSP
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Jonathan Kagan @jkagan1.bsky.social · 20/12/2025
Evidence continues to accumulate that CD4 T cells are important for vaccine induced anti-tumor immunity. A new study links CD27 to the generation of long-lived protective CD4 T cells. Kudos to the authors on this exciting finding. www.science.org/doi/10.1126/...
science.org
CD27 agonism enhances long-lived CD4 T cell vaccine responses critical for antitumor immunity
CD27 agonism enhances vaccine-induced CD4 T cell responses, enabling durable antitumor immunity not entirely dependent on CD8 T cells.
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