کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1931311 1050548 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Depletion of the cellular levels of Bag-1 proteins attenuates phorbol ester-induced downregulation of IκBα and nuclear accumulation of NF-κB
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Depletion of the cellular levels of Bag-1 proteins attenuates phorbol ester-induced downregulation of IκBα and nuclear accumulation of NF-κB
چکیده انگلیسی

Bag-1 consists in humans of four isoforms generated from the same RNA by alternative translation. Overexpression of single Bag-1 isoforms has identified Bag-1 as a negative regulator of action of many proteins including the glucocorticoid receptor (GR). Here we have analysed the ability of Bag-1 to regulate the transrepression function of the GR. Silencing Bag-1 expression only marginally affects the transrepression action of the GR but decreased the action of the transcription factor NF-κB. Furthermore phosphorylation and degradation of the inhibitor protein IκBα and nuclear accumulation of p65 and p50 NF-κB proteins in response to phorbol ester was attenuated following Bag-1 depletion in HeLa cells. Reconstitution of Bag-1 in depleted cells partially restored IκBα and NF-κB activation. Knock-down of Bag-1 expression also did not significantly alter GR-mediated transactivation but affected the basal transcription of some of the target genes. Thus Bag-1 proteins function as regulators of the action of selective transcription factors.

Research highlights
► Bag-1 depletion only marginally affects the action of the glucocorticoid receptor but strongly regulates the activity of NF-κB.
► Bag-1 depletion attenuates phosphorylation and degradation of IκBα and nuclear accumulation of NF-κB p65 and p50.
► Bag-1 interacts with IκBα and partially restores IκBα and NF-κB activation in Bag-1 depleted cells.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 401, Issue 3, 22 October 2010, Pages 406–411
نویسندگان
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