Abstract
Dietary restriction (DR) influences several physiological processes, retards the incidences and severity of various age-related diseases and extends lifespan of various animal species. The effect of DR on the activities of malate–aspartate shuttle enzymes, viz. cytosolic and mitochondrial aspartate aminotransferase (c- and m-AsAT) and malate dehydrogenase (c- and m-MDH) was investigated in the liver and kidney of adult (5-months) and old (21-months) male mice. The results show that the activity (U/mg protein) of both c- and m-MDH and AsAT is decreased significantly in the liver and kidney of old mice compared to adult ones. However, DR in old mice reverses significantly the enzyme activities to a level closer to adult animals. Polyacrylamide gel electrophoresis (PAGE) and specific staining of c-AsAT, one of the selected isoenzymes of the shuttle, showed a similar pattern of activity expression as observed by activity measurements in both the tissues studied. Slot blot analysis of c-AsAT confirmed the lower protein content of this isoenzyme in old mice compared to adult ones and a higher level in old-dietary restricted mice. Thus, our results suggest that the late onset of DR in older mice reverses decline in malate–aspartate shuttle enzymes and that it may allow a better metabolic regulation in older animals.
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We are grateful to the North Eastern Hill University, Shillong for providing research facilities.
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Goyary, D., Sharma, R. Late onset of dietary restriction reverses age-related decline of malate–aspartate shuttle enzymes in the liver and kidney of mice. Biogerontology 9, 11–18 (2008). https://doi.org/10.1007/s10522-007-9112-8
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DOI: https://doi.org/10.1007/s10522-007-9112-8