Cardiac-specific overexpression of catalase prolongs lifespan and attenuates ageing-induced cardiomyocyte contractile dysfunction and protein damage.

Abstract:

:1. Oxidative stress plays a role in senescence-associated organ deterioration. This is supported by the beneficial effects of anti-oxidants against ageing-related organ damage, although their role in cardiac ageing has not been elucidated. 2. The aim of the present study was to examine the impact of cardiac-specific overexpression of catalase, an enzyme for H(2)O(2) detoxification, on cardiac contractile function and protein damage in young (3-4 months) and old (26-28 months) male mice. Lifespan was analysed using the Kaplan-Meier survival curve. Cardiomyocyte contractile indices at various stimulus frequencies (0.1-5.0 Hz) were analysed, including peak shortening (PS), time to 90% PS, time to 90% relengthening (TR(90)) and maximal velocity of shortening/relengthening (+/-dL/dt). Protein damage was assessed using protein carbonyl formation. Catalase transgenic mice showed longer lifespan than wild-type FVB mice. The catalase transgene itself did not alter bodyweight or organ weight, or myocyte function. Ageing depressed +/-dL/dt and prolonged TR(90), but had no effect on other indices in FVB mice. Increased frequency triggered decreases in PS amplitude were exaggerated in aged FVB myocytes. Interestingly, ageing-induced mechanical defects were significantly attenuated in myocytes from catalase mice. Protein carbonyl formation was elevated in aged FVB compared with young FVB mice, which was significantly diminished in catalase mice. The proteomes of the myocardium of young or old FVB and catalase mice were compared using two-dimensional gel electrophoresis and mass spectrometry. Six proteins with differential expression between young and old FVB groups were tentatively identified, some of which were reversed by catalase. 3. In summary, the present data suggest that catalase protects cardiomyocytes from ageing-induced contractile defects and protein damage.

authors

Wu S,Li Q,Du M,Li SY,Ren J

doi

10.1111/j.1440-1681.2007.04540.x

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

81-7

issue

1-2

eissn

0305-1870

issn

1440-1681

pii

CEP4540

journal_volume

34

pub_type

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