کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1936024 1050681 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heat shock protein 90β: A novel mediator of vitamin D action
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Heat shock protein 90β: A novel mediator of vitamin D action
چکیده انگلیسی

We investigated the role of Heat shock protein 90 (Hsp90) in vitamin D action in Caco-2 cells using geldanamycin (GA) to block Hsp90 function and RNA interference to reduce Hsp90β expression. When cells were exposed to GA, vitamin D-mediated gene expression and transcriptional activity were inhibited by 69% and 54%, respectively. Gel shift analysis indicated that GA reduced vitamin D-mediated DNA binding activity of the vitamin D receptor (VDR). We tested the specific role of Hsp90β by knocking down its expression with stably expressed short hairpin RNA. Vitamin D-induced gene expression and transcriptional activity were reduced by 90% and 80%, respectively, in Hsp90β-deficient cells. Nuclear protein for VDR and RXRα, its heterodimer partner, were not reduced in Hsp90β-deficient cells. These findings indicate that Hsp90β is needed for optimal vitamin D responsiveness in the enterocyte and demonstrate a specific role for Hsp90β in VDR signaling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 367, Issue 3, 14 March 2008, Pages 578–583
نویسندگان
, , , , ,