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Am J Physiol Cell Physiol 279: C248-C256, 2000;
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Vol. 279, Issue 1, C248-C256, July 2000

IL-4 and IL-13 upregulate arginase I expression by cAMP and JAK/STAT6 pathways in vascular smooth muscle cells

Liu Hua Wei1, Aaron T. Jacobs1, Sidney M. Morris Jr.2, and Louis J. Ignarro1

1 Department of Molecular and Medical Pharmacology, UCLA School of Medicine, Los Angeles, California 90095; and 2 Department of Biochemistry and Molecular Genetics, University of Pittsburgh, Pittsburgh, Pennsylvania 15261

The objectives of this study were to determine whether rat aortic smooth muscle cells (RASMC) express arginase and to elucidate the possible mechanisms involved in the regulation of arginase expression. The results show that RASMC contain basal arginase I (AI) activity, which is significantly enhanced by stimulating the cells with either interleukin (IL)-4 or IL-13, but arginase II (AII) expression was not detected under any condition studied here. We further investigated the signal transduction pathways responsible for AI induction. AI mRNA and protein levels were enhanced by addition of forskolin (1 µM) and inhibited by H-89 (30 µM), suggesting positive regulation of AI by a protein kinase A pathway. Genistein (10 µg/ml) and sodium orthovanadate (Na3VO4; 10 µM) were used to investigate the role of tyrosine phosphorylation in the control of AI expression. Genistein inhibited, whereas Na3VO4 enhanced the induction of AI by IL-4 or IL-13. Along with immunoprecipitation and immunoblot analyses, these data implicate the JAK/STAT6 pathway in AI regulation. Dexamethasone (Dex) and interferon (IFN)-gamma were investigated for their effects on AI induction. Dex (1 µM) and IFN-gamma (100 U/ml) alone had no effect on basal AI expression in RASMC, but both reduced AI induction by IL-4 and IL-13. In combination, Dex and IFN-gamma abolished AI induction by IL-4 and IL-13. Finally, both IL-4 and IL-13 significantly increased RASMC DNA synthesis as monitored by [3H]thymidine incorporation, demonstrating that upregulation of AI is correlated with an increase in cell proliferation. Blockade of AI induction by IFN-gamma , H-89, or genistein also blocked the increase in cell proliferation. These observations are consistent with the possibility that upregulation of AI might play an important role in the pathophysiology of vascular disorders characterized by excessive smooth muscle growth.

interleukin; rat aortic smooth muscle cells; cell proliferation; cytokines


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