کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2197882 1550992 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Egr-1 binds the GnRH promoter to mediate the increase in gene expression by insulin
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیولوژی سلول
پیش نمایش صفحه اول مقاله
Egr-1 binds the GnRH promoter to mediate the increase in gene expression by insulin
چکیده انگلیسی

Insulin increases gonadotropin-releasing hormone (GnRH) gene expression in in vitro models of GnRH neurons. Early growth response-1 (Egr-1) is a transcription factor that mediates the effect of insulin on target genes. In the GN11 cell line – an immortalized GnRH-secreting neuronal cell line – insulin maximally increases Egr-1 mRNA after 30 min of treatment and Egr-1 protein and GnRH mRNA after 60 min of treatment. Egr-1 small interfering RNA blocks the insulin-induced increase in GnRH promoter activity, measured as luciferase expression. Chromatin immunoprecipitation using Egr-1 antibody precipitates DNA in a proximal region of the GnRH promoter but not DNA in a distal region. Mutagenesis of a putative Egr-1 binding site within the proximal region blocks the insulin-induced increase in GnRH promoter activity. Thus, Egr-1 binds the GnRH promoter at a site between −67 and −76 bp from the transcriptional start site to mediate the insulin-induced increase in GnRH gene transcription.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular and Cellular Endocrinology - Volume 270, Issues 1–2, 30 May 2007, Pages 64–72
نویسندگان
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