title: Inhibition of cardiac remodeling by pravastatin is associated with amelioration of endoplasmic reticulum stress.
abstract: The aim of this study is to investigate whether pravastatin can inhibit cardiac remodeling and ameliorate endoplasmic reticulum (ER) stress caused by pressure overload or tumor necrosis factor alpha (TNFalpha). Either pravastatin (5 mg/kg/d) or vehicle alone was orally administered to male C57BL/6J mice from day 2 after a transverse aortic constriction (TAC) was performed. The ER stress signaling pathway was also studied in pressure-overloaded hearts and in cultured cardiomyocytes treated with TNFalpha. Four weeks after TAC, pravastatin treatment significantly reduced heart/body weight and lung/body weight ratios and increased left ventricular (LV) fractional shortening compared with the TAC alone. Markers of ER stress, such as increases in ER chaperone and C/EBP homologous protein (CHOP) expression and enhanced phosphorylation of anti-phospho-eukaryotic initiation factor 2alpha (eIF2alpha), were observed in the hearts of TAC mice, while pravastatin treatment significantly blunted these changes. Pravastatin-treated TAC mice also showed less cardiac apoptosis. Cardiac expression of TNFalpha was increased in TAC mice, and TNFalpha induced ER stress in cultured neonatal rat cardiomyocytes, either of which was significantly inhibited by pravastatin. These findings indicate that pravastatin inhibits cardiac remodeling in mice subjected to pressure overload, and that this action is associated with inhibition of the ER stress signaling pathway.
authors.affiliation: Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Suita, Japan.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.forename: Yulin
authors.initials: Y
authors.lastname: Liao
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Minamino
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Asano
authors.forename: Masanori
authors.initials: M
authors.lastname: Asakura
authors.forename: Jiyoong
authors.initials: J
authors.lastname: Kim
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Asanuma
authors.forename: Seiji
authors.initials: S
authors.lastname: Takashima
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Hori
authors.forename: Masafumi
authors.initials: M
authors.lastname: Kitakaze
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D006332:Cardiomegaly / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D004721:Endoplasmic Reticulum / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D005355:Fibrosis; D006333:Heart Failure / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018832:Molecular Chaperones / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism / Q000473:pathology; D032383:Myocytes, Cardiac / Q000378:metabolism / Q000473:pathology; D017035:Pravastatin / Q000494:pharmacology*; D015398:Signal Transduction / Q000187:drug effects; D013312:Stress, Physiological / Q000187:drug effects*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism; D017725:Ventricular Pressure; D020257:Ventricular Remodeling / Q000187:drug effects*
chemical_list: D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors; D008070:Lipopolysaccharides; D018832:Molecular Chaperones; D014409:Tumor Necrosis Factor-alpha; D017035:Pravastatin