期刊
JOURNAL OF CELLULAR BIOCHEMISTRY
卷 117, 期 1, 页码 74-83出版社
WILEY
DOI: 10.1002/jcb.25249
关键词
EXTRACELLULAR MATRIX; FORKHEAD TRANSCRIPTION FACTOR O1; GLOMERULAR MESANGIAL CELL; LENTIVIRAL VECTORS; OXIDATIVE STRESS; TRANSFORMING GROWTH FACTOR-B PATHWAY
资金
- Young Foundation of the First Affiliated Hospital of Zhengzhou University
Diabetic nephropathy is characterized by inordinate secretion of extracellular matrix (ECM) proteins from mesangial cells (MCs), which is tightly associated with excessive activation of TGF-beta signaling. The forkhead transcription factor O1 (FoxO1) protects mesangial cells from hyperglycemia-induced oxidative stress, which may be involved in ameliorating the redundant secretion of ECM proteins under high glucose conditions. Here, we reported that high glucose elevated the level of p-Akt to attenuate endogenous FoxO1 bioactivities in MCs, accompanied with decreases in the mRNA expressions of catalase (CAT) and superoxide dismutase 2 (SOD2). Meanwhile, the expressions of major ECM proteins-FN and Col I-increased under high glucose conditions, in consistent with the activation of TGF-beta/Smad signaling. By contrast, overexpression of nucleus-localized FoxO1 (insensitive to Akt phosphorylation) directly up-regulated the expressions of anti-oxidative enzymes, accompanied with inactivation of TGF-beta/Smad3 pathway, as well as decreases of extracellular matrix proteins. Moreover, similar to those MCs overexpressed of nucleus-localized FoxO1 in high glucose conditions, MCs with down-regulation of FoxO1 by small interference-RNA under normal glucose conditions showed increased FN level and activated TGF-beta/Smad3 pathway. Our findings link the anti-oxidative activity of FoxO1 and the TGF-beta-induced secretion of ECM proteins, indicating the novel role of FoxO1 in protecting MCs under high glucose conditions. (C) 2015 Wiley Periodicals, Inc.
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