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An expanded parenchymal CD8+ T cell clone in GABAA receptor encephalitis.

Ann Clin Transl Neurol. 2020 Jan 14. doi: 10.1002/acn3.50974. [Epub ahead of print]

Authors/Editors: Bracher A, Alcalá C, Ferrer J, Melzer N, Hohlfeld R, Casanova B, Beltrán E, Dornmair K.
Publication Date: 2020

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Abstract

The role of T cells in autoimmune encephalitis syndromes with autoantibodies against cell surface antigens is still enigmatic. Here we analyzed the T cell receptor repertoires of CD8+ and CD4+ T cells in a patient with "idiopathic" gamma-aminobutyric-acid-A receptor (GABAA -R) encephalitis by next-generation sequencing and single-cell analyses. We identified a CD8+ T cell clone that was strongly expanded in the cerebrospinal fluid and in the hippocampus but not in the operculo-insular cortex. By contrast, CD4+ T cells were polyclonal in these tissues. Such a strong clonal expansion suggests that CD8+ T cells may play a significant role in the pathogenesis.

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