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 p47(phox). 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.
journal_name
J Am Coll Cardioljournal_title
Journal of the American College of Cardiologyauthors
Zhou G,Li X,Hein DW,Xiang X,Marshall JP,Prabhu SD,Cai Ldoi
10.1016/j.jacc.2008.05.019subject
Has Abstractpub_date
2008-08-19 00:00:00pages
655-66issue
8eissn
0735-1097issn
1558-3597pii
S0735-1097(08)01932-3journal_volume
52pub_type
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