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- W4313333758 abstract "Abstract Glucocorticoid hormones modulate T cell maturation in vivo. While low levels of hormones are required for appropriate T cell development, high levels of glucocorticoid hormones target immature developing thymocytes for cell death during systemic stress. In this report, we propose a molecular mechanism for the induction of apoptosis in CD4+CD8+ double-positive thymocytes by dexamethasone in vivo. Dexamethasone injection induced the expression of IκBα and IκBβ in thymocytes and down-regulated NF-κB DNA binding activated by intrathymic signals. Down-regulation of NF-κB DNA binding preceded cell death, suggesting that NF-κB may be important for the survival of immature thymocytes. In addition, ex vivo treatment of thymocyte single-cell suspension with dexamethasone accelerated p65/RelA down-regulation and cell death. Conversely, NF-κB induction diminished dexamethasone-induced death. Expression of the c-myc proto-oncogene, a NF-κB target, was also reduced in thymocytes of dexamethasone-treated animals, and ectopic transgenic expression of c-myc in mice provided partial rescue of double-positive thymocytes from dexamethasone mediated cell death. These observations suggest that viability of CD4+CD8+ thymocytes may be maintained by an NF-κB/c-myc-dependent pathway in vivo." @default.
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- W4313333758 date "1999-01-01" @default.
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- W4313333758 title "A NF-κB/c-<i>myc</i>-Dependent Survival Pathway Is Targeted by Corticosteroids in Immature Thymocytes" @default.
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- W4313333758 doi "https://doi.org/10.4049/jimmunol.162.1.314" @default.
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