Heme oxygenase-1 inhibits angiotensin II-induced cardiac hypertrophy in vitro and in vivo
- PMID: 15226216
- DOI: 10.1161/01.CIR.0000135475.35758.23
Heme oxygenase-1 inhibits angiotensin II-induced cardiac hypertrophy in vitro and in vivo
Abstract
Background: Heme oxygenase-1 (HO-1) is a stress-response enzyme implicated in cardioprotection. To explore whether HO-1 has a role in cardiac remodeling response, the effect of its overexpression on angiotensin II (Ang II)-induced cardiac hypertrophy was examined.
Methods and results: HO-1 was induced in cultured rat neonatal cardiomyocytes by treatment with cobalt protoporphyrin IX (CoPPIX) or a recombinant adenovirus carrying the human HO-1 gene. Ang II-induced myocyte hypertrophy assessed by increments in cell size, [3H]leucine uptake, and protein content was suppressed by HO-1 overexpression. Cotreatment of cells with tin protoporphyrin IX, a HO inhibitor, significantly reversed the suppressive effect of HO-1. Bilirubin, one of the byproducts of heme degradation by HO-1, mediated the suppressive effect through the inhibition of Ang II-induced production of reactive oxygen species, as detected by a 2',7'-dichlorofluorescein probe. The antihypertrophic effect of HO-1 was also demonstrated in rats receiving chronic Ang II infusions. Cotreatment of animals with CoPPIX significantly attenuated Ang II-induced left ventricular hypertrophy and hyperdynamic contractions, whereas concomitant treatment with tin protoporphyrin IX abolished CoPPIX-mediated cardioprotection in vivo.
Conclusions: HO-1 attenuates Ang II-induced cardiac hypertrophy both in vitro and in vivo, and bilirubin mediates, at least in part, the antihypertrophic effect of HO-1 via inhibition of reactive oxygen species production after Ang II stimulation.
Comment in
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Letter regarding article by Hu et al, "heme oxygenase-1 inhibits angiotensin II-induced cardiac hypertrophy in vitro and in vivo".Circulation. 2005 Feb 15;111(6):e100; author reply e100. doi: 10.1161/01.CIR.0000155250.27345.02. Circulation. 2005. PMID: 15710770 No abstract available.
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