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• W2011309962 abstract "Abstract Thymocytes from adult mice synthesize glucocorticoids (GCs), and some data indicate a role for this hormone production in thymic homeostasis. Here we present further support for this view by showing that the dramatic increase in thymocyte number seen after adrenalectomy (ADX) does not correlate with the decrease in systemic GCs but rather with an ACTH-mediated down-regulation of GC synthesis in thymocytes. High ACTH concentrations caused by ADX in wild-type mice down-regulated CYP11B1 mRNA expression, encoding the last enzyme required for corticosterone synthesis and as a consequence reduced GC synthesis in thymocytes. This was not seen in IL-1β/IL-18 double-knockout mice unable to respond to ADX with high ACTH levels. However, if ADX IL-1β/IL-18 double-knockout mice were treated with ACTH, this led to a down-regulation of CYP11B1 and GC synthesis in thymocytes. In addition, in vivo treatment of mice with the CYP11B1 antagonist metyrapone, without affecting the systemic corticosterone level, increased thymocyte numbers and in vitro treatment of isolated thymocytes prevented thymocyte loss. Furthermore, in vitro experiments showed that both ACTH and its receptor-induced second-messenger molecule cAMP down-regulated mRNA expression of critical enzymes in GC steroidogenesis and GC synthesis in thymocytes. We conclude that thymocyte-produced GCs are important for the homeostasis of adult mouse thymocytes and that high ACTH level, in contrast to stimulating GC synthesis in the adrenal glands, has the opposite effect in thymocytes." @default.
• W2011309962 created "2016-06-24" @default.
• W2011309962 creator A5021443948 @default.
• W2011309962 creator A5049241081 @default.
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• W2011309962 date "2009-04-30" @default.
• W2011309962 modified "2023-10-15" @default.
• W2011309962 title "Thymocyte-Synthesized Glucocorticoids Play a Role in Thymocyte Homeostasis and Are Down-Regulated by Adrenocorticotropic Hormone" @default.
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• W2011309962 doi "https://doi.org/10.1210/en.2009-0195" @default.
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