Mitochondria-mediated hormetic response in life span extension of calorie-restricted Saccharomyces cerevisiae.
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.
Sharma
Praveen Kumar
PK
Department of Biotechnology, National Institute of Pharmaceutical Education and Research, Punjab, India.
Agrawal
Vineet
V
Roy
Nilanjan
N
D000220:Adaptation, Biological; D000255:Adenosine Triphosphate / Q000378:metabolism; D000975:Antioxidants / Q000378:metabolism; D031204:Caloric Restriction; D003470:Culture Media; D006861:Hydrogen Peroxide; D008136:Longevity; D008928:Mitochondria / Q000378:metabolism*; D009245:NADH Dehydrogenase / Q000378:metabolism; D010101:Oxygen Consumption; D017382:Reactive Oxygen Species / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism*
D000975:Antioxidants; D003470:Culture Media; D017382:Reactive Oxygen Species; D000255:Adenosine Triphosphate; D006861:Hydrogen Peroxide; D009245:NADH Dehydrogenase