What is it about?

Autoimmune neurological syndromes associated with antibodies against the enzyme GAD65 are rare disorders whose disease mechanisms are still poorly understood. In this study, we used single cell RNA sequencing, immune repertoire analysis, flow cytometry, and histology to analyze immune cells from cerebrospinal fluid, blood, and brain tissue of individuals with anti-GAD65-associated neurological syndromes. By comparing affected individuals with appropriate controls, we generated a high resolution map of the immune landscape across compartments and identified disease relevant immune cell populations.

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Why is it important?

We found a marked expansion of a specific type of long-lived memory T cells, known as stem cell-like memory T cells, in the cerebrospinal fluid of affected individuals. These cells showed features of activation, cytotoxicity, and pro-inflammatory gene expression, indicating a potential role in ongoing immune mediated damage within the central nervous system. Similar T cell populations were also detected in the peripheral blood and in brain tissue. In contrast, B cells in the cerebrospinal fluid showed limited clonal expansion. However, a subset of antibodies produced by these cells specifically recognized GAD65 and displayed signs of antigen driven maturation. Together, these findings support the concept of an antigen specific immune response within the central nervous system and identify stem cell-like memory T cells as a key cellular hallmark of anti-GAD65-associated neurological syndromes.

Perspectives

By analyzing immune cells at single cell resolution in blood and cerebrospinal fluid, and by histological examination of brain tissue, we were able to identify a specific population of clonally expanded T cells that appears to play a central role in anti-GAD65-associated neurological syndromes. These findings help refine our understanding of disease mechanisms and may inform future therapeutic strategies.

Saskia Räuber
Heinrich-Heine-Universitat Dusseldorf

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This page is a summary of: Immune cell profiling reveals expanded stem cell–like memory T cells in anti-GAD65-associated neurological syndromes, Proceedings of the National Academy of Sciences, March 2026, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.2514753123.
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