Journal
CLINICAL AND EXPERIMENTAL PHARMACOLOGY AND PHYSIOLOGY
Volume 34, Issue 1-2, Pages 81-87Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1440-1681.2007.04540.x
Keywords
ageing; catalase; myocytes; protein carbonyl; proteomics; shortening/relengthening
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Funding
- NIAAA NIH HHS [1R15 AA13575-01] Funding Source: Medline
- NIA NIH HHS [1R03 AG21324-01] Funding Source: Medline
- NATIONAL INSTITUTE ON AGING [R03AG021324] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON ALCOHOL ABUSE AND ALCOHOLISM [R15AA013575] Funding Source: NIH RePORTER
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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 H2O2 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 (TR90) 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 TR90, 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 yound 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.
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