کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10904699 | 1086674 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Age-related synthesis of glucocorticoids in thymocytes
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موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
تحقیقات سرطان
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چکیده انگلیسی
Glucocorticoids (GCs) are primarily synthesized in the adrenal glands but an ectopic production has also been reported in the brain, the gastrointestinal tract and in thymic epithelial cells (TEC). Here we show that thymocytes express genes encoding for all enzymes required for de novo GC synthesis and produce the hormone as demonstrated by both a GC specific reporter assay and a corticosterone specific ELISA assay. Interestingly, GC synthesis is detectable in cells from young mice (4Â weeks) and thereafter increases during aging (14-22Â weeks) together with an increased gene expression of the rate-limiting enzymes StAR and CYP11A1. Hormone production occurred at a thymocyte differentiation stage characterized by being double positive for the CD4 and CD8 surface markers but was found to be unrelated to CD69 expression, a marker for thymocytes undergoing positive selection. No GC synthesis was found in resting or anti-CD3 activated CD4 and CD8 positive T cells isolated from the spleen. Thymocyte-derived GC had an anti-proliferative effect on a GR-transfected cell line and induced apoptosis in thymocytes. The age- and differentiation stage-related GC synthesis in thymocytes may play a role in the involution process that the thymus gland undergoes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Cell Research - Volume 314, Issue 16, 1 October 2008, Pages 3027-3035
Journal: Experimental Cell Research - Volume 314, Issue 16, 1 October 2008, Pages 3027-3035
نویسندگان
Shengjun Qiao, Liying Chen, Sam Okret, Mikael Jondal,