Leon Smyth

Leon Smyth

@leonsmyth.bsky.social

CNS immunology, stroma, and barriers | Lab head @Monash | former postdoc in @kipnislab @WUSTL | Kiwi 🥝 🇳🇿

1,089 Followers 327 Following 51 Posts Joined Nov 2024
2 days ago
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Integrative CSF profiling identifies disease-specific immune responses in leptomeningeal disease
@cp-cellrepmed.bsky.social
www.cell.com/cell-reports...

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4 days ago

Its definitely a cool story and has come a long way since the CSHL meeting. Decided against GRC in the end, would have loved to go, but with new students and postdocs starting wanted to make sure I was on hand for them. Major FOMO but hopefully will be back in a couple of years with an entourage 😁

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4 days ago

Congrats Julie and Sophia! Looks great and the TNF data are particularly interesting! 🤩

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4 days ago
graphical schematic of the meninges on top depicting the three layers [dura, arachnoid and pia] and other immune and vascular cell types. Inset shows Claudin-11 junction proteins connecting two sides of arachnoid barrier cells

bottom schematic is the same but in inflammation with bacteria, junctions breakdown, depiction of cytokine release by vascular, meningeal and immune cells - at side of graphic is summary of defects we observe in infection: 'increased barrier permeability' 'mislocalization of Cldn11+ tight junction' 'BAM activation' and "increased inflammatory response'

🚨 New preprint from our lab led by Sophia Kim w/ @kellydoran.bsky.social group @cuanschutz.bsky.social -- using neonatal 🐭 model of bacterial meningitis ➡️ arachnoid barrier is leaky, Cldn11 junctions are disrupted & cytokines are part of the problem. Lots of 🤩🧠🦠🔬 & compelling data, check it out! 1/5

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6 days ago
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Amyloidosis of bridging veins is a pathologic feature of #Alzheimers disease, from @leonsmyth.bsky.social, Rupal Mehta, @jonykipnis.bsky.social et al. rupress.org/jem/article/...

📘 In our #Lymphatics collection: rupress.org/jem/collecti...

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3 weeks ago
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Autoimmune neuroinflammation leads to neuronal death via MIF nuclease-mediated parthanatos Nature Neuroscience - Neuroinflammation triggers DNA damage and subsequent parthanatos-mediated neuron death. Inhibiting parthanatos in a mouse model of autoimmune inflammation is neuroprotective...

How does inflammation kill neurons, and what can we do about it? Check out our latest paper where we consider this question: rdcu.be/e4nfP.

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3 weeks ago

The Da Mesquita lab at Mayo Clinic (www.mayo.edu/research/lab...) is looking for a postdoctoral researcher to work on projects investigating the role(s) of the meningeal lymphatic vasculature in models of neurodegenerative diseases. Please spread the word and contact me in case you are interested! 😃

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3 weeks ago
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Base barrier cells provide compartmentalization of choroid plexus, brain and CSF - Nature Neuroscience Verhaege et al. identify a conserved fibroblast barrier population at the base of the choroid plexus that compartmentalizes brain–CSF interfaces and is disrupted by inflammation, revealing a new site ...

Base barrier cells provide compartmentalization of choroid plexus, brain and CSF | Nature Neuroscience

www.nature.com/articles/s41...

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3 weeks ago
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Review @natrevdrugdiscov.nature.com
Therapeutic targeting of neuroimmune mechanisms in neurodegeneration
www.nature.com/articles/s41...

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1 month ago
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First proof-of-concept for engineered T cells as a potential treatment for Alzheimer's disease
pnas.org/doi/10.1073/...

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1 month ago

Yeah the morphology surely governing a lot of this, and perhaps the more limited set of junctional proteins that they express. Would be super cool to know more about the function!

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1 month ago

Very interesting, the junction structure looks different too - lots of buttons… 🤔

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1 month ago

ZO1 in the pia? 😮

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1 month ago
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1 month ago
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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...

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

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1 month ago

🙏🙏 to entire team esp co-lead Tim Bartels. So proud of @seppedeschepper.bsky.social brilliant first postdoc who now leads his own at VIB. 🙏🙏🙏to @chanzuckerberg.bsky.social for supporting the project from early pilot phase. Contact us if u want to explore next steps in PD gut/brain neuroimmunology!

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1 month ago
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Clonal CD8+ T cells populate the leptomeninges and coordinate with immune cells in human degenerative brain diseases
www.nature.com/articles/s41...

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1 month ago

Congrats Ben and team! Beautiful work 🤩

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1 month ago
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Convergent evolution of scavenger cell development at brain borders - Nature Transcription factor osr2 is identified as a specific marker and regulator of mural lymphatic endothelial cell (muLEC) differentiation and maintenance, and muLECs and border-associated macrophages sha...

We’re delighted to see this out today! Latest work from the lab reveals insights into the evolution of brain immunity and the developmental and evolutionary plasticity of lymphatic endothelial cells.
www.nature.com/articles/s41...

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1 month ago
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Fibroblastic reticular cells direct the initiation of T cell responses via CD44 @nature.com @the-de-lab.bsky.social
www.nature.com/articles/s41...

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1 month ago
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Diversity and immune dynamics of choroid plexus macrophages are shaped by distinct developmental origins @natneuro.nature.com Brioschi & Colonna
www.nature.com/articles/s41...

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1 month ago
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Preprint: Type I IFN activates border-associated macrophages to drive MHC-I–dependent immune surveillance after stroke
www.researchsquare.com/article/rs-8...

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1 month ago

Macrophage immunosenescence prolongs intraocular inflammation in aged mice via impaired induction of regulatory T cells https://www.biorxiv.org/content/10.64898/2026.01.15.697975v1

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1 month ago
Black text on grey background. Screenshot of direct message from a researcher in Australia describing how the immigration time-scales for a postdoc coming to Australia are now so long that they undo the much better efficiency of other countries’ grant systems.

Very common story from a follower👇

Even if you can avoid ARC’s ludicrously long time-scales & recruit via another country’s much more efficient system, you hit Australia’s immigration system.

Barrier after barrier. It’s YEARS between idea & starting the research in Australia.

The slooow country.

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1 month ago

Congrats Caroline and all the authors! 🤩🤩🤩

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1 month ago
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3 papers in Cell @cellpress.bsky.social today exploring the mechanistic connection between Epstein-Barr virus and multiple sclerosis #MultipleSclerosis
cell.com/cell/fulltex...
cell.com/cell/fulltex...
www.cell.com/cell/fulltex...

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2 months ago

A genetically encoded reporter reveals interferon responses in multiple cell lineages https://www.biorxiv.org/content/10.64898/2026.01.08.698513v1

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2 months ago
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Review @cp-trendsimmuno.bsky.social
Decoding brain border immunity to enable future therapeutic avenues
www.cell.com/trends/immun...

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2 months ago
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Multi-modal choroid plexus pathology in aging and Alzheimer’s disease Brain barriers, cerebrospinal fluid (CSF) dynamics, and peripheral factors are implicated as significant contributors to Alzheimer’s disease (AD). The choroid plexus (ChP) is a blood-brain interface t...

Beautiful preprint by Maria Lehtinen's group on the impact of aging and Alzheimer's disease on the choroid plexus.

www.biorxiv.org/content/10.6...

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2 months ago

Thrilled to share our new paper on reactive microglial plasticity! Using long-term fate mapping and epigenetic profiling, we uncover the remarkable plasticity of reactive microglia across the lifespan and the enhancers and associated TFs that govern state transitions.

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