alexa High glucose induced VEGF expression via PKC and ERK in glomerular podocytes.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Hoshi S, Nomoto K, Kuromitsu J, Tomari S, Nagata M

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Abstract Podocytes are the major site of vascular endothelial growth factor (VEGF) production in the kidney, and up-regulation of VEGF plays a critical role in the progression of diabetic nephropathy. Using a differentiated mouse podocyte cell line, we investigated the roles of protein kinase C (PKC) and extracellular signal-regulated kinase (ERK) on the expression of VEGF under high glucose conditions. High glucose induced up-regulation of VEGF mRNA and protein expression in podocytes via activation of PKC (PKC-alpha and -betaII isoforms) and ERK. High glucose stimulated [(3)H]leucine incorporation in the podocytes. High glucose and the PKC stimulator, phorbol 12-myristate 13-acetate (PMA) induced activator protein-1 (AP-1)-dependent transcriptional activity and expression of VEGF. In addition, these phenomena were blocked by specific inhibitors of PKC (GF10902X) and ERK kinase (PD98059). These observations suggested that high glucose-induced VEGF expression in podocytes was largely mediated through PKC and ERK pathways that may be involved in diabetic nephropathy. (c)2002 Elsevier Science. This article was published in Biochem Biophys Res Commun and referenced in Journal of Diabetes & Metabolism

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