Glucose-induced Akt1 activation mediates fibronectin synthesis in endothelial cells.

Abstract:

AIMS/HYPOTHESIS:Increased expression and decreased degradation of extracellular matrix (ECM) proteins are key features of chronic diabetic complications. Fibronectin, a predominant ECM protein, has been shown to be overexpressed in all target organs of diabetic complications and in endothelial cells cultured in high levels of glucose. The present study was designed to elucidate the role of protein kinase B (Akt/PKB) in glucose-induced fibronectin mRNA expression and protein production in vascular endothelial cells. METHODS:Human umbilical vein endothelial cells were cultured in the presence of high glucose to study Akt/PKB activation. The upstream and downstream mediators in the Akt/PKB pathway were also investigated using dominant negative transfections and specific inhibitors of signalling pathways. Cells were subjected to real time RT-PCR, western blotting, and confocal microscopy to assess Akt1/PKBalpha activation and fibronectin mRNA expression and protein production. To detect transcription factor activation, electrophoretic mobility shift assay was carried out. RESULTS:Our data demonstrate that fibronectin mRNA expression and protein production that are induced by high glucose are mediated via activation of Akt/PKB, which is modulated by mitogen-activated protein kinase, phosphatidylinositol 3-kinase, and protein kinase C. Glucose-induced fibronectin mRNA expression and protein production are also mediated by Akt1/PKBalpha-dependent activation of the transcription factors nuclear factor-kappaB and activating protein-1. CONCLUSIONS/INTERPRETATION:Our study provides insight into the mechanical basis of glucose-induced increases in fibronectin mRNA expression and protein production. High levels of glucose may increase fibronectin mRNA expression and protein production by activating Akt/PKB.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Xin X,Khan ZA,Chen S,Chakrabarti S

doi

10.1007/s00125-005-1939-4

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

2428-36

issue

11

eissn

0012-186X

issn

1432-0428

journal_volume

48

pub_type

杂志文章
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    authors: Phipps K,Barker DJ,Hales CN,Fall CH,Osmond C,Clark PM

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