Upregulation of osteopontin gene expression in diabetic rat proximal tubular cells revealed by microarray profiling

Kidney International
T-J HsiehJ S D Chan

Abstract

Progression of diabetic nephropathy appears directly related to renal tubulointerstitial injury, but the involved genes are incompletely delineated. To identify such genes, DNA microarray analysis was performed with RNA from renal proximal tubules (RPTs) of streptozotocin-induced diabetic Wistar rats, spontaneously diabetic BioBreeding rats, and rat immortalized renal proximal tubular cells (IRPTCs) exposed to high glucose (25 mM) medium for 2 weeks. Osteopontin (OPN) mRNA expression was quantified by real time-quantitative polymerase chain reaction (RT-qPCR) or conventional reverse transcriptase-polymerase chain reaction (RT-PCR). OPN mRNA expression was upregulated (5-70-fold increase) in diabetic rat RPTs and in IRPTCs chronically exposed to high glucose compared to control RPTs and IRPTCs. High glucose, angiotensin II, phorbol 12-myristate 13-acetate and transforming growth factor-beta 1 (TGF-beta1) stimulated OPN mRNA expression in IRPTCs in a dose- and time-dependent manner. This effect was inhibited by tiron, taurine, diphenylene iodinium, losartan, perindopril, calphostin C, or LY 379196 but not PD123319. IRPTCs overexpressing dominant-negative protein kinase C-beta 1 (PKC-beta1) cDNA or antisense TGF-beta1 cDNA prevent...Continue Reading

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Citations

Apr 29, 2009·Expert Reviews in Molecular Medicine·Amber Paratore Sanchez, Kumar Sharma
Aug 24, 2012·Toxicological Sciences : an Official Journal of the Society of Toxicology·Tusty-Jiuan HsiehMing-Tsang Wu
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May 29, 2021·Archives of Physiology and Biochemistry·Chang GuoGuoyue Yuan

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