Linked Life Data

16585059

Source:http://linkedlifedata.com/resource/pubmed/id/16585059

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pubmed-article:16585059pubmed:abstractTextSenescence is accompanied by oxidative stress and cardiac dysfunction, although the link between the two remains unclear. This study examined the role of antioxidant metallothionein on cardiomyocyte function, superoxide generation, the oxidative stress biomarker aconitase activity, cytochrome c release, and expression of oxidative stress-related proteins, such as the GTPase RhoA and NADPH oxidase protein p47phox in young (5-6 mo) and aged (26-28 mo) FVB wild-type (WT) and cardiac-specific metallothionein transgenic mice. Metallothionein mice showed a longer life span (by approximately 4 mo) than FVB mice evaluated by the Kaplan-Meier survival curve. Compared with young cardiomyocytes, aged myocytes displayed prolonged TR(90), reduced tolerance to high stimulus frequency, and slowed intracellular Ca2+ decay, all of which were nullified by metallothionein. Aging increased superoxide generation, active RhoA abundance, cytochrome c release, and p47phox expression and suppressed aconitase activity without affecting protein nitrotyrosine formation in the hearts. These aging-induced changes in oxidative stress and related protein biomarkers were attenuated by metallothionein. Aged metallothionein mouse myocytes were more resistant to the superoxide donor pyrogallol-induced superoxide generation and apoptosis. In addition, aging-associated prolongation in TR90 was blunted by the Rho kinase inhibitor Y-27632. Collectively, our data demonstrated that metallothionein may alleviate aging-induced cardiac contractile defects and oxidative stress, which may contribute to prolonged life span in metallothionein transgenic mice.lld:pubmed
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pubmed-article:16585059pubmed:articleTitleMetallothionein prolongs survival and antagonizes senescence-associated cardiomyocyte diastolic dysfunction: role of oxidative stress.lld:pubmed
pubmed-article:16585059pubmed:affiliationDivision of Pharmaceutical Sciences and Center for Cardiovascular Research and Alternative Medicine, University of Wyoming, Laramie, Wyoming 82071-3375, USA.lld:pubmed
pubmed-article:16585059pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16585059pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:16585059pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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