Abstract
Reactive oxygen species (ROS) are considered a key factor in mitochondrial dysfunction associated with brain aging process. Mitochondrial respiration is an important source of ROS and hence a potential contributor to brain functional changes with aging. In this study, we examined the effect of aging on cytochrome c oxidase activity and other bioenergetic processes such as oxygen consumption, membrane potential and ROS production in rat brain mitochondria. We found a significant age-dependent decline in the cytochrome c oxidase activity which was associated with parallel changes in state 3 respiration, membrane potential and with an increase in H2O2 generation. The cytochrome aa3 content was practically unchanged in mitochondria from young and aged animals. The age-dependent decline of cytochrome c oxidase activity could be restored, in situ, to the level of young animals, by exogenously added cardiolipin. In addition, exposure of brain mitochondria to peroxidized cardiolipin resulted in an inactivation of this enzyme complex. It is suggested that oxidation/depletion of cardiolipin could be responsible, at least in part, for the decline of cytochrome c oxidase and mitochondrial dysfunction in brain aging. Melatonin treatment of old animals largely prevented the age-associated alterations of mitochondrial bioenergetic parameters. These results may prove useful in elucidating the molecular mechanisms underlying mitochondrial dysfunction associated with brain aging process, and may have implications in etiopathology of age-associated neurodegenerative disorders and in the development of potential treatment strategies.
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Petrosillo, G., De Benedictis, V., Ruggiero, F.M. et al. Decline in cytochrome c oxidase activity in rat-brain mitochondria with aging. Role of peroxidized cardiolipin and beneficial effect of melatonin. J Bioenerg Biomembr 45, 431–440 (2013). https://doi.org/10.1007/s10863-013-9505-0
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DOI: https://doi.org/10.1007/s10863-013-9505-0