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, 329 (1), 275-80

Glucose-induced Serum- And Glucocorticoid-Regulated Kinase Activation in Oncofetal Fibronectin Expression

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Glucose-induced Serum- And Glucocorticoid-Regulated Kinase Activation in Oncofetal Fibronectin Expression

Zia A Khan et al. Biochem Biophys Res Commun.

Abstract

Preferential expression of oncofetal extra domain-B fibronectin (EDB(+) FN), a proposed angiogenic marker, has been shown in proliferative diabetic retinopathy. High levels of glucose also increase EDB(+) FN expression in endothelial cells (ECs) via transforming growth factor-beta1 (TGF-beta1) and endothelin-1 (ET-1). The present study was aimed at elucidating the role of serum- and glucocorticoid-regulated kinase (SGK-1) in glucose-induced EDB(+) FN expression. Using human macro- and microvascular ECs, we show that high levels of glucose, TGF-beta1, and ET-1 increase the EDB(+) FN expression via SGK-1 alteration at the mRNA, protein, and activity levels. Inhibition of TGF-beta1 and ET-1 prevented glucose-induced SGK-1 activation and the EDB(+) FN expression. Furthermore, using siRNA-mediated SGK-1 gene silencing, we show that glucose-induced EDB(+) FN expression can be completely prevented. These findings provide first evidence of glucose-induced SGK-1 activation in altered EDB(+) FN expression and provide novel avenues for therapeutic modalities.

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