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- W2096475468 abstract "Follicular helper T cells (TFH cells) constitute the CD4+ T cell subset that is specialized to provide help to germinal center (GC) B cells and, consequently, mediate the development of long-lived humoral immunity. TFH cell differentiation is driven by the transcription factor Bcl6, and recent studies have identified cytokine and cell–cell signals that drive Bcl6 expression. However, although TFH dysregulation is associated with several major autoimmune diseases, the mechanisms underlying the negative regulation of TFH cell differentiation are poorly understood. In this study, we show that STAT5 inhibits TFH cell differentiation and function. Constitutive STAT5 signaling in activated CD4+ T cells selectively blocked TFH cell differentiation and GCs, and IL-2 signaling was a primary inducer of this pathway. Conversely, STAT5-deficient CD4+ T cells (mature STAT5fl/fl CD4+ T cells transduced with a Cre-expressing vector) rapidly up-regulated Bcl6 expression and preferentially differentiated into TFH cells during T cell priming in vivo. STAT5 signaling failed to inhibit TFH cell differentiation in the absence of the transcription factor Blimp-1, a direct repressor of Bcl6 expression and TFH cell differentiation. These results demonstrate that IL-2, STAT5, and Blimp-1 collaborate to negatively regulate TFH cell differentiation." @default.
- W2096475468 created "2016-06-24" @default.
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- W2096475468 date "2012-01-23" @default.
- W2096475468 modified "2023-10-12" @default.
- W2096475468 title "STAT5 is a potent negative regulator of TFH cell differentiation" @default.
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- W2096475468 doi "https://doi.org/10.1084/jem.20111174" @default.
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