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• W1932187564 abstract "Abstract Ataxia-telangiectasia (A-T) is a rare neurodegenerative immunodeficiency disorder caused by mutations in the ataxia telangiectasia mutated gene. Patients commonly have lymphopenia and Ig-production abnormalities. We used multicolor flow cytometry and IL-7 ELISA to investigate the effect of A-T and age on the proportions of major lymphocyte subsets and their pattern of CD95 expression in relation to IL-7 levels in 15 classical A-T patients. We also analyzed the sensitivity of T cells from four classical A-T patients to CD95-mediated apoptosis using TUNEL and caspase-activation assays. Our results confirmed lymphopenia and a deficiency in naive T and B cells in A-T patients. In contrast to controls, the proportions of naive and memory T and B cell subsets in A-T patients did not vary in relation to age. There was no evidence of a deficiency in plasma IL-7 or IL-7R expression, and IL-7 concentration correlated positively with CD95 expression on CD4+ T cells. CD95 expression on unstimulated A-T lymphocytes was high, and the apoptotic sensitivity of activated naive and central memory T cells was increased. These findings show that the immunodeficiency in A-T patients may be described as congenitally aged and is not progressive. The naive cell deficiency is not related to a deficiency in IL-7 or its receptor. However, IL-7 may upregulate CD95 on A-T lymphocytes. High CD95 expression and increased apoptotic sensitivity of activated naive and central memory T cells may result in an increased level of CD95-mediated apoptosis, which could contribute to the congenital lymphopenia in A-T." @default.
• W1932187564 created "2016-06-24" @default.
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• W1932187564 date "2012-07-01" @default.
• W1932187564 modified "2023-10-10" @default.
• W1932187564 title "Classical Ataxia Telangiectasia Patients Have a Congenitally Aged Immune System with High Expression of CD95" @default.
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• W1932187564 doi "https://doi.org/10.4049/jimmunol.1101909" @default.
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