This Article Full Text Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Copyright Permission Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Zhang, S.-L. Articles by Chan, J. S. D. Search for Related Content PubMed PubMed Citation Articles by Zhang, S.-L. Articles by Chan, J. S. D.

Insulin Inhibits Angiotensinogen Gene Expression via the Mitogen-Activated Protein Kinase Pathway in Rat Kidney Proximal Tubular Cells¹

University of Montréal (S.-L.Z., X.C., J.G.F., J.S.D.C.), Maisonneuve-Rosemont Hospital, Research Center, Montréal, Québec, Canada H1T 2M4; Harvard Medical School (S.-S.T., J.R.I.), Massachusetts General Hospital, Pediatric Nephrology Unit, WAC 709, Boston, Massachusetts 02114-3117

Address all correspondence and requests for reprints to: Dr. John S. D. Chan, University of Montréal, Maisonneuve-Rosemmont Hospital, Research Center, 5415 boulevard de l’Assomption, Montréal, Québec, Canada, H1T 2M4.

The present study aimed to investigate the molecular mechanism(s) of insulin action on angiotensinogen (ANG) secretion and gene expression in kidney proximal tubular cells exposed to high levels of glucose. Immortalized rat proximal tubular cells (IRPTC) were cultured in monolayer. The levels of rat ANG and ANG messenger RNA in the IRPTC were quantified by a specific RIA for rat ANG (RIA-rANG) and by an RT-PCR assay. Insulin inhibited the stimulatory effect of a high level of glucose (25 mM) and phorbol 12-myristate 13-acetate, an activator of protein kinase C) on the secretion of ANG and the expression of the ANG messenger RNA in IRPTC. This inhibitory action of insulin on the ANG secretion and gene expression was blocked by PD98059 (an inhibitor of mitogen-activated protein kinase kinase) but not by Wortmannin (an inhibitor of phosphatidylinositol-3-kinase). PD98059 was effective in inhibiting the phosphorylation of MEK 1/2 and p44/42 MAP kinase in IRPTC stimulated by insulin. These studies demonstrate that insulin prevents the stimulatory effect of high levels of glucose on the expression of the renal ANG gene in IRPTC, at least in part, via the MAPK kinase signal transduction pathway, subsequently inhibiting the activation of the local renal renin-angiotensin system.

This article has been cited by other articles:

				H. Kobori, M. Nangaku, L. G. Navar, and A. Nishiyama The Intrarenal Renin-Angiotensin System: From Physiology to the Pathobiology of Hypertension and Kidney Disease Pharmacol. Rev., September 1, 2007; 59(3): 251 - 287. [Abstract] [Full Text] [PDF]

				C.-C. Wei, S.-L. Zhang, Y.-W. Chen, D.-F. Guo, J. R. Ingelfinger, K. Bomsztyk, and J. S. D. Chan Heterogeneous Nuclear Ribonucleoprotein K Modulates Angiotensinogen Gene Expression in Kidney Cells J. Biol. Chem., September 1, 2006; 281(35): 25344 - 25355. [Abstract] [Full Text] [PDF]

				C.-C. Wei, D.-F. Guo, S.-L. Zhang, J. R. Ingelfinger, and J. S.D. Chan Heterogenous Nuclear Ribonucleoprotein F Modulates Angiotensinogen Gene Expression in Rat Kidney Proximal Tubular Cells J. Am. Soc. Nephrol., March 1, 2005; 16(3): 616 - 628. [Abstract] [Full Text] [PDF]

				T.-J. Hsieh, P. Fustier, C.-C. Wei, S.-L. Zhang, J. G Filep, S.-S. Tang, J. R Ingelfinger, I G. Fantus, P. Hamet, and J. S D Chan Reactive oxygen species blockade and action of insulin on expression of angiotensinogen gene in proximal tubular cells J. Endocrinol., December 1, 2004; 183(3): 535 - 550. [Abstract] [Full Text] [PDF]

				T.-J. Hsieh, P. Fustier, S.-L. Zhang, J. G. Filep, S.-S. Tang, J. R. Ingelfinger, I. G. Fantus, P. Hamet, and J. S. D. Chan High Glucose Stimulates Angiotensinogen Gene Expression and Cell Hypertrophy via Activation of the Hexosamine Biosynthesis Pathway in Rat Kidney Proximal Tubular Cells Endocrinology, October 1, 2003; 144(10): 4338 - 4349. [Abstract] [Full Text] [PDF]

				A. A. Banday, M. Asghar, T. Hussain, and M. F. Lokhandwala Dopamine-Mediated Inhibition of Renal Na,K-ATPase Is Reduced by Insulin Hypertension, June 1, 2003; 41(6): 1353 - 1358. [Abstract] [Full Text] [PDF]

				S.-L. Zhang, X. Chen, C.-C. Wei, J. G. Filep, S.-S. Tang, J. R. Ingelfinger, and J. S. D. Chan Insulin Inhibits Dexamethasone Effect on Angiotensinogen Gene Expression and Induction of Hypertrophy in Rat Kidney Proximal Tubular Cells in High Glucose Endocrinology, December 1, 2002; 143(12): 4627 - 4635. [Abstract] [Full Text] [PDF]

				X. Chen, S.-L. Zhang, L. Pang, J. G. Filep, S.-S. Tang, J. R. Ingelfinger, and J. S. D. Chan Characterization of a Putative Insulin-Responsive Element and Its Binding Protein(s) in Rat Angiotensinogen Gene Promoter: Regulation by Glucose and Insulin Endocrinology, June 1, 2001; 142(6): 2577 - 2585. [Abstract] [Full Text] [PDF]

				S.-L. Zhang, S.-S. Tang, X. Chen, J. G. Filep, J. R. Ingelfinger, and J. S. D. Chan High Levels of Glucose Stimulate Angiotensinogen Gene Expression Via the P38 Mitogen-Activated Protein Kinase Pathway in Rat Kidney Proximal Tubular Cells Endocrinology, December 1, 2000; 141(12): 4637 - 4646. [Abstract] [Full Text] [PDF]