BCL11B is required for positive selection and survival of double-positive thymocytes

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BCL11B is required for positive selection and survival of double-positive thymocytes

Transcriptional control of gene expression in double-positive (DP) thymocytes remains poorly understood. We show that the transcription factor BCL11B plays a critical role in DP thymocytes by controlling positive selection of both CD4 and CD8 lineages. BCL11B-deficient DP thymocytes rearrange T cell receptor (TCR) alpha; however, they display impaired proximal TCR signaling and attenuated extra...

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Cytokine signal transduction is suppressed in preselection double-positive thymocytes and restored by positive selection

Death by neglect requires that CD4+8+ double-positive (DP) thymocytes avoid cytokine-mediated survival signals, which is presumably why DP thymocytes normally extinguish IL-7R gene expression. We report that DP thymocytes before positive selection (preselection DP thymocytes) fail to transduce IL-7 signals even when they express high levels of transgenic IL-7R on their surface, because IL-7R si...

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Ubc9 Is Required for Positive Selection and Late-Stage Maturation of Thymocytes.

SUMOylation is an important posttranslational modification that regulates protein function in diverse biological processes. However, its role in early T cell development has not been genetically studied. UBC9 is the only E2 enzyme for all SUMOylation. In this study, by selectively deleting Ubc9 gene in T cells, we have investigated the functional roles of SUMOylation in T cell development. Loss...

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Transcription factor Bcl11b controls selection of invariant natural killer T-cells by regulating glycolipid presentation in double-positive thymocytes.

Invariant natural killer T cells (iNKT cells) are innate-like T cells important in immune regulation, antimicrobial protection, and anti-tumor responses. They express semi-invariant T cell receptors, which recognize glycolipid antigens. Their positive selection is mediated by double-positive (DP) thymocytes, which present glycolipid self-antigens through the noncanonical MHC class I-like molecu...

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NF-kB Is Required for the Positive Selection of CD8 Thymocytes

To examine the role of NF-kB in T cell development, we analyzed thymocyte ontogeny in transgenic (mutant I-kBa (mI-kBa)) mice that express a superinhibitory form of the NF-kB inhibitory protein, I-kBa (I-kBaA32/36), under the control of the T cell-specific CD2 promoter and enhancer. Thymi from mI-kBa mice contained increased numbers of double-positive (DP) and decreased numbers of both CD4 and ...

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ژورنال

عنوان ژورنال: Journal of Experimental Medicine

سال: 2007

ISSN: 1540-9538,0022-1007

DOI: 10.1084/jem.20070863