Retinoic acid attenuates inducible nitric oxide synthase (NOS2) activation in cultured rat cardiac myocytes and microvascular endothelial cells

Journal of Molecular and Cellular Cardiology
S GrosjeanD Ungureanu-Longrois

Abstract

S. Grosjean, Y. Devaux, C. Seguin, C. Meistelman, F. Zannad, P.-M. Mertes, R. A. Kelly and D. Ungureanu-Longrois. Retinoic Acid Attenuates Inducible Nitric Oxide Synthase (NOS2) Activation in Cultured Rat Cardiac Myocytes and Microvascular Endothelial Cells. Journal of Molecular and Cellular Cardiology (2001) 33, 933-945. The inducible NO synthase (NOS2) in cardiac tissue contributes to myocardial and coronary inflammation and dysfunction. Several natural (endogenous) hormones such as retinoic acid, the active metabolite of vitamin A, have the ability to attenuate NOS2 activation in inflammatory cells. The aim of this study was to investigate the effect of RA on NOS2 activation in cultured cardiac microvascular endothelial cells (CMEC) and adult rat ventricular myocytes (ARVM). CMEC were stimulated either with a combination of 10 microg/ml lipopolysaccharide (LPS) and 50 IU/ml interferon- gamma (IFN- gamma) or with a combination of 1 ng/ml interleukin-1 beta (IL-1 beta)+IFN- gamma whereas ARVM were stimulated with 1 ng/ml IL-1 beta and 50 IU/ml IFN- gamma in the absence or presence of all-trans retinoic acid (atRA). Activation of the NOS2 pathway was estimated by measurement of mRNA (Northern blot) and protein (Western blot) ex...Continue Reading

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