What does this research mean for the field?

Anti-Yo paraneoplastic cerebellar degeneration is driven by compartmentalized immune responses, specifically characterized by impaired immune tolerance and the selective clonal expansion of cytotoxic CD4+ T cells in the cerebrospinal fluid. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To define the immune landscape across the blood and central nervous system and determine the cellular mechanisms driving neuronal damage in anti-Yo paraneoplastic cerebellar degeneration.

September 3, 2026Communications MedicineOpen Access

Compartmentalized cytotoxic CD4+ T cell responses in anti-Yo paraneoplastic cerebellar degeneration

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Authors

CPCharles PetitpréKarolinska Institutet ATAnna TranUniversité Claude Bernard Lyon 1 VWValentin WucherUniversité Claude Bernard Lyon 1

Discussion

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Implication

Comparative study reveals compartmentalized cytotoxic CD4+ T-cell expansion in anti-Yo paraneoplastic cerebellar degeneration, indicating localized functional reprogramming.

Key Points

To define the immune landscape across the blood and central nervous system and determine the cellular mechanisms driving neuronal damage in anti-Yo paraneoplastic cerebellar degeneration.
Conducted single-cell RNA sequencing with paired T-cell receptor sequencing on blood and cerebrospinal fluid immune cells from six patients with anti-Yo paraneoplastic cerebellar degeneration (N=6).
Compared transcriptional profiles and clonal dynamics against control cohorts with multiple sclerosis, idiopathic intracranial hypertension, and ovarian cancer lacking neurological disease.
Identified impaired immune tolerance programs in myeloid and regulatory T cells from affected patients, marked by decreased transforming growth factor-β pathway expression.
Demonstrated compartment-specific myeloid activation programs, with major histocompatibility complex class I enriched in blood and class II enriched in cerebrospinal fluid.
Detected selective clonal expansion and progressive differentiation of cytotoxic CD4-positive T cells sharing receptor clonotypes in cerebrospinal fluid, indicating localized functional reprogramming.

Cite This Study

Petitpré et al. (2026) studied this question.

synapsesocial.com/papers/6a9935e5636c6408cfa7e77d https://doi.org/10.1038/s43856-026-01841-x

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Implication

Comparative study reveals compartmentalized cytotoxic CD4+ T-cell expansion in anti-Yo paraneoplastic cerebellar degeneration, indicating localized functional reprogramming.

Compartmentalized cytotoxic CD4+ T cell responses in anti-Yo paraneoplastic cerebellar degeneration

Discussion

Member takes

Implication

Key Points

Cite This Study

Compartmentalized cytotoxic CD4+ T cell responses in anti-Yo paraneoplastic cerebellar degeneration

Discussion

Member takes

Implication

Key Points

Cite This Study

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