• Regulation of rat liver NADP+-isocitrate dehydrogenase during aging

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    • Keywords


      Isocitrate dehydrogenase; induction; purification; electrophoretic mobility; temperature sensitivity

    • Abstract


      In an attempt to understand the mechanism of aging in relation to the differences in enzyme regulation, the induction and kinetic properties of NADP+ -isocitrate dehydrogenase of the liver of immature (6 weeks), mature (13 weeks), adult (33 weeks) and old (85 weeks) female rats were studied. The specific activity of the cytoplasmic and mitochondrial NADP+ -isocitrate dehydrogenase increased up to the adult age (33 weeks) and decreased in the old rats (85 weeks). Overiectomy decreased and estradiol administration induced activity of both the mitochondrial and eytoplasmic enzyme in the liver ol immature, mature and adult rats but had no significant effect in old rats. However, the activity of mitochondrial NADP+ -isocitrate dehydrogenase decreased and eytoplasmic NADP+ -isocitrate dehydrogenase increased following ovariectomy in old rats (85 weeks). Hormone-mediated induction of enzyme activity was actinomycin D sensitive. The Km for isocitrate and NADP, Ki value for oxalomalate, heat stability and electrophoretic mobility of the purified enzyme from the cytosol fraction of the liver of immature and old rats were similar. It can he concluded that the enzyme does not change structurally with age.

    • Author Affiliations


      R N Singh Yadav1 S N Singh1

      1. Biochemistry Laboratory, Department of Zoology, Banaras Hindu University, Varanasi - 221005
    • Dates

  • Journal of Biosciences | News

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      Posted on July 25, 2019

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