例如:"lncRNA", "apoptosis", "WRKY"

Sublytic C5b-9 triggers glomerular mesangial cell apoptosis in rat Thy-1 nephritis via Gadd45 activation mediated by Egr-1 and p300-dependent ATF3 acetylation.

J Mol Cell Biol. 2016 Dec;8(6):477-491. Epub 2016 May 04
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摘要


The apoptosis of glomerular mesangial cells (GMCs) is considered to be an important contributor to the initiation and development of rat Thy-1 nephritis (Thy-1N) and is accompanied by sublytic C5b-9 deposition. However, the mechanism by which sublytic C5b-9 triggers GMC apoptosis has not been elucidated. In this study, functional and histological examinations were performed on GMCs treated with sublytic C5b-9 (in vitro) and renal tissues of Thy-1N rats (in vivo). The in vitro studies found that sublytic C5b-9 could trigger GMC apoptosis through upregulating Egr-1, ATF3, and Gadd45 expression. Egr-1-mediated post-transcriptional modulation of ATF3, Egr-1/ATF3-enhanced Gadd45 promoter activity, and p300-mediated ATF3 acetylation were all involved in GMC apoptosis. More importantly, the effective binding elements for Egr-1 and ATF3 to Gadd45β/γ promoters and the ATF3 acetylation site were identified. In vivo, silencing renal p300, Egr-1, ATF3, and Gadd45β/γ significantly decreased GMC apoptosis, secondary GMC proliferation, and urinary protein secretion in Thy-1N rats. Together, these findings implicate that sublytic C5b-9-induced activation of Egr-1/p300-ATF3/Gadd45 axis plays a critical role in GMC apoptosis in Thy-1N rats.

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