Dependence of H2O2 Formation by Rat Heart Mitochondria on Substrate Availability and Donor Age

Journal of bioenergetics - Tập 29 - Trang 89-95 - 1997
Richard G. Hansford1, Barbara A. Hogue1, Vida Mildaziene2
1National Institute on Aging, Baltimore
2Institute for Biomedical Research, Kaunas Medical Academy, Kaunas, Lithuania

Tóm tắt

We have examined the substrate specificity and inhibitor sensitivity of H2O2 formation by rat heart mitochondria. Active H2O2 production requires both a high fractional reduction of Complex I (indexed by NADH/NAD+ + NADH ratio) and a high membrane potential, ΔΨ. These conditions are achieved with supraphysiological concentrations of succinate. With physiological concentrations of NAD-linked substrates, rates of H2O2 formation are much lower (less than 0.1% of respiratory chain electron flux) but may be stimulated by the Complex III inhibitor antimycin A, but not by myxothiazol. Addition of Mn2+ to give 10 nmol/mg of mitochondrial protein enhances H2O2 production with all substrate combinations, possibly by repleting mitochondrial superoxide dismutase with this cation. Contrary to previously published work, no increased activity of H2O2 production was found with heart mitochondria from senescent (24 month) rats, relative to young adults (6 month).

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Journal of bioenergetics

Tập 29

89-95

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