Effect of every other day feeding on mitochondrial free radical production and oxidative stress in mouse liver.

Abstract:

:It is known that dietary restriction (DR) increases maximum longevity in rodents, but the mechanisms involved remain unknown. Among the possible mechanisms, several lines of evidence support the idea that decreases in mitochondrial oxidative stress and in insulin signaling are involved but it is not known if they are interconnected. It has been reported that when C57BL/6 mice are maintained on an every other day (EOD) feeding their overall food intake is only slightly decreased and plasma insulin-like growth factor (IGF)-1 is even somewhat increased. In spite of this, their maximum longevity is increased, analogously to what occurs in classic DR. Thus, this model dissociates the increase in longevity from the decrease in IGF-1 observed in classic DR. Based on these facts, we have studied the effect of EOD DR on the rate of mitochondrial reactive oxygen species (ROS) production, oxygen consumption, and the percent free radical leak (FRL) of well-coupled liver mitochondria, the marker of mtDNA oxidative damage 8-oxo-7,8-dihydro-2'deoxyguanosine (8-oxodG), the content of complexes I to IV of the respiratory chain, the apoptosis inducing factor (AIF), PGC1-alpha, UCP2, five different markers of oxidative damage to proteins and the full fatty acid composition on C57BL/6 mice liver. It was found that EOD DR decreased ROS production in complex I but not in complex III without changes in oxygen consumption. As a result, FRL was decreased in complex I. Oxidative damage to mtDNA (8-oxodG) and protein oxidation, glycoxidation and lipoxidation were also lower in the EOD restricted group in comparison with the control one while the degree of fatty acid unsaturation was held constant. The EOD group also showed decreases in AIF, PGC1-alpha, and UCP2. These results support the possibility that EOD DR increases maximum life span at least in part through decreases in mitochondrial oxidative stress which are independent from insulin/IGF-1-like signaling.

journal_name

Rejuvenation Res

journal_title

Rejuvenation research

authors

Caro P,Gómez J,López-Torres M,Sánchez I,Naudi A,Portero-Otín M,Pamplona R,Barja G

doi

10.1089/rej.2008.0704

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

621-9

issue

3

eissn

1549-1684

issn

1557-8577

journal_volume

11

pub_type

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