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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1992 Oct 1;89(19):9112–9116. doi: 10.1073/pnas.89.19.9112

Protein oxidation associated with aging is reduced by dietary restriction of protein or calories.

L D Youngman 1, J Y Park 1, B N Ames 1
PMCID: PMC50075  PMID: 1409611

Abstract

The accumulation of unrepaired oxidative damage products may be a major factor in cellular aging. Both oxidative lesions in DNA and oxidatively damaged proteins have been shown to accumulate during aging. The accumulation of oxidized proteins in Fischer 344 rats was compared for animals consuming protein-restricted and calorically restricted diets--both of which have been shown to extend lifespan. Rats were fed diets restricted in either protein (5% or 10% of the diet as compared with the normal 20% casein), or calories (25% or 40% less than normal), or total diet (40% less than normal). In addition, some of the rats fed a diet providing 5% or 20% protein were irradiated twice weekly (125 rads per exposure; 1 rad = 0.01 Gy). The level of oxidative damage to proteins (protein carbonyls) was determined in rats sacrificed at various times. The oxidative damage to proteins increased with aging and with radiation. Either protein or calorie restriction markedly inhibited the accumulation of oxidatively damaged proteins. Protein restriction reduced the accumulation of oxidatively damaged proteins during the oxidative stress of chronic irradiation.

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Selected References

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