Abstract
Calorie restriction (CR) is the only proven regimen, which confers lifespan extension benefits across the various phyla right from unicellular organisms like yeast to primates. In a bid to elucidate the mechanism of calorie-restriction-mediated life span extension, the role of mitochondria in the process was investigated. In this study, we found that the mitochondrial content in CR cells remains unaltered as compared to cells grown on nonrestricted media. However, mitochondria isolated from CR cells showed increased respiration and elevated reactive oxygen species levels without augmenting adenosine triphosphate (ATP) generation. The antioxidant defense system was amplified in CR mitochondria, and in CR cells a cross protection to hydrogen-peroxide-induced stress was also observed. Moreover, we also documented that a functional electron transport chain was vital for the life span extension benefits of calorie restriction. Altogether, our results indicate that calorie restriction elicits mitohormetic effect, which ultimately leads to longevity benefit.
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Acknowledgements
The authors thank Westermann B at the Institut für Physiologische Chemie, Germany, for providing pVT100UmtGFP. We acknowledge Dr Girish Varshney and Sukhwinder Kaur at the Institute of Microbial Technology, Sector 39, Chandigarh, India, for their assistance in the flow cytometry experiments. Senior research fellowship from the Indian Council of Medical Research to Praveen Kumar Sharma is also acknowledged. We thank our lab members KD Prajapati and Nitish Mittal for reading the manuscript.
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Sharma, P.K., Agrawal, V. & Roy, N. Mitochondria-mediated hormetic response in life span extension of calorie-restricted Saccharomyces cerevisiae . AGE 33, 143–154 (2011). https://doi.org/10.1007/s11357-010-9169-1
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DOI: https://doi.org/10.1007/s11357-010-9169-1