Metallothionein Suppresses Angiotensin II-Induced Nicotinamide Adenine Dinucleotide Phosphate Oxidase Activation, Nitrosative Stress, Apoptosis, and Pathological Remodeling in the Diabetic Heart

Guihua Zhou, Xiaokun Li, David W. Hein, Xilin Xiang, James P. Marshall, Sumanth D. Prabhu, Lu Cai

Research output: Contribution to journalArticlepeer-review

110 Scopus citations

Abstract

Objectives: We evaluated metallothionein (MT)-mediated cardioprotection from angiotensin II (Ang II)-induced pathologic remodeling with and without underlying diabetes. Background: Cardiac-specific metallothionein-overexpressing transgenic (MT-TG) mice are resistant to diabetic cardiomyopathy largely because of the antiapoptotic and antioxidant effects of MT. Methods: The acute and chronic cardiac effects of Ang II were examined in MT-TG and wild-type (WT) mice, and the signaling pathways of Ang II-induced cardiac cell death were examined in neonatal mouse cardiomyocytes. Results: Acute Ang II administration to WT mice or neonatal cardiomyocytes increased cardiac apoptosis, nitrosative damage, and membrane translocation of the nicotinamide adenine dinucleotide phosphate oxidase (NOX) isoform p47phox. These effects were abrogated in MT-TG mice, MT-TG cardiomyocytes, and WT cardiomyocytes pre-incubated with peroxynitrite or superoxide scavengers and NOX inhibitors, suggesting a critical role for NOX activation in Ang II-mediated apoptosis. Prolonged administration of subpressor doses of Ang II (0.5 mg/kg every other day for 2 weeks) also induced apoptosis and nitrosative damage in both diabetic and nondiabetic WT hearts, but not in diabetic and nondiabetic MT-TG hearts. Long-term follow-up (1 to 6 months) of both WT and MT-TG mice after discontinuing Ang II administration revealed progressive myocardial fibrosis, hypertrophy, and dysfunction in WT mice but not in MT-TG mice. Conclusions: Metallothionein suppresses Ang II-induced NOX-dependent nitrosative damage and cell death in both nondiabetic and diabetic hearts early in the time course of injury and prevents the late development of Ang II-induced cardiomyopathy.

Original languageEnglish
Pages (from-to)655-666
Number of pages12
JournalJournal of the American College of Cardiology
Volume52
Issue number8
DOIs
StatePublished - Aug 19 2008

Keywords

  • NADPH oxidase
  • angiotensin II
  • cardiomyocyte apoptosis
  • diabetic cardiomyopathy
  • metallothionein
  • nitrosative damage

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