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Circulation Research. 2000;87:596-602

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(Circulation Research. 2000;87:596.)
© 2000 American Heart Association, Inc.


Molecular Medicine

Peroxisome Proliferator–Activated Receptor Activators Inhibit Lipopolysaccharide-Induced Tumor Necrosis Factor-{alpha} Expression in Neonatal Rat Cardiac Myocytes

Hiroyuki Takano, Toshio Nagai, Masayuki Asakawa, Tetsuya Toyozaki, Toru Oka, Issei Komuro, Toshihiro Saito, Yoshiaki Masuda

From the Third Department of Internal Medicine (H.T., T.N., M.A., T.T., T.S., Y.M.), Chiba University School of Medicine, and Department of Cardiovascular Medicine (T.O., I.K.), University of Tokyo Graduate School of Medicine, Japan.

Correspondence to Hiroyuki Takano, MD, PhD, Third Department of Internal Medicine, Chiba University School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. E-mail htakano-cib{at}umin.ac.jp

Abstract—Peroxisome proliferator–activated receptors (PPARs) are transcription factors belonging to the nuclear receptor superfamily. Recently, PPAR activators have been shown to inhibit the production of proinflammatory cytokines in macrophages or vascular smooth muscle cells. It has been reported that tumor necrosis factor-{alpha} (TNF-{alpha}) expression is elevated in the failing heart and that TNF-{alpha} has a negative inotropic effect on cardiac myocytes. Therefore, we examined the effects of PPAR{alpha} and PPAR{gamma} activators on expression of TNF-{alpha} in neonatal rat cardiac myocytes. Northern blot analysis revealed expression of PPAR{alpha} and PPAR{gamma} mRNA in cardiac myocytes. Immunofluorescent staining demonstrated that both PPAR{alpha} and PPAR{gamma} were expressed in the nuclei of cells. When cardiac myocytes were transfected with PPAR responsive element (PPRE)-luciferase reporter plasmid, both PPAR{alpha} and PPAR{gamma} activators increased the promoter activity. Cardiomyocytes were stimulated with lipopolysaccharide (LPS), and the levels of TNF-{alpha} in the medium were measured by ELISA. After exposure to LPS, the levels of TNF-{alpha} significantly increased. However, pretreatment of myocytes with PPAR{alpha} or PPAR{gamma} activators decreased LPS-induced expression of TNF-{alpha} in the medium. Both PPAR{alpha} and PPAR{gamma} activators also inhibited LPS-induced increase in TNF-{alpha} mRNA in myocytes. In addition, electrophoretic mobility shift assays demonstrated that PPAR activators reduced LPS-induced nuclear factor-{kappa}B activation. These results suggest that both PPAR{alpha} and PPAR{gamma} activators inhibit cardiac expression of TNF-{alpha} in part by antagonizing nuclear factor-{kappa}B activity and that treatment with PPAR activators may lead to improvement in congestive heart failure.


Key Words: peroxisome proliferator–activated receptor • tumor necrosis factor-{alpha} • nuclear factor-{kappa}B • cardiac myocyte




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