Long-term melatonin administration protects brain mitochondria from aging
Article first published online: 1 JUL 2009
© 2009 The Authors. Journal compilation © 2009 John Wiley & Sons A/S
Journal of Pineal Research
Volume 47, Issue 2, pages 192–200, September 2009
How to Cite
Carretero, M., Escames, G., López, L. C., Venegas, C., Dayoub, J. C., García, L. and Acuña-Castroviejo, D. (2009), Long-term melatonin administration protects brain mitochondria from aging. Journal of Pineal Research, 47: 192–200. doi: 10.1111/j.1600-079X.2009.00700.x
- Issue published online: 2 AUG 2009
- Article first published online: 1 JUL 2009
- Received May 15, 2009; accepted June 4, 2009.
- oxidative phosphorylation;
- oxidative stress;
- respiratory chain
Abstract: We tested whether chronic melatonin administration in the drinking water would reduce the brain mitochondrial impairment that accompanies aging. Brain mitochondria from male and female senescent prone (SAMP8) mice at 5 and 10 months of age were studied. Mitochondrial oxidative stress was determined by measuring the levels of lipid peroxidation and nitrite, glutathione/glutathione disulfide ratio, and glutathione peroxidase and glutathione reductase activities. Electron transport chain activity and oxidative phosphorylation capability of mitochondria were also determined by measuring the activity of the respiratory chain complexes and the ATP content. The results support a significant age-dependent mitochondrial dysfunction with a diminished efficiency of the electron transport chain and reduced ATP production, accompanied by an increased oxidative/nitrosative stress. Melatonin administration between 1 and 10 months of age completely prevented the mitochondrial impairment, maintaining or even increasing ATP production. There were no major age-dependent differences between males in females, although female mice seemed to be somewhat more sensitive to melatonin treatment than males. Thus, melatonin administration as a single therapy maintained fully functioning brain mitochondria during aging, a finding with important consequences in the pathophysiology of brain aging.