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W2098491388 abstract "This paper describes the effect of the organophosphorus compound, the oxygen analogue of ronnel (OAR), on the activity of some membrane-bound enzyme systems in the brain mitochondria of developing, young-adult, and old rats. Age-related changes were noted in the cholesterol-to-protein ratio, whereas the phospholipid content in mitochondria showed little change during development as well as aging. The results obtained suggest that development of brain succinate dehydrogenase may consist in a decrease of Km and increase of Vmax values. In aged rats an altered, perhaps inhibited form of the enzyme is produced. The oxygen analogue of ronnel caused a mixed-type inhibition of the succinate dehydrogenase derived from brains of 4-day-old, 16-day-old and 2-month-old animals. In the case of enzyme from the brain of 18-month-old rats, a typical competitive-type inhibition was observed. Mechanisms responsible for inhibition of the succinate: cytochrome c reductase from brains of developing animals are similar to those for succinate dehydrogenase. In aged rats (18 months old), however, a noncompetitive mechanism of inhibition of succinate: cytochrome c reductase was revealed. The experiments reported here provide evidence that lipid-soluble molecules of OAR may interact with membrane phospholipids and lead to modification of membrane architecture and also of enzyme kinetic behaviour. It may be also concluded, that the sensitivity of the enzyme systems studied to inhibition by OAR is an age-dependent phenomenon. Modification of membrane by development or aging alters the kinetics as well as the sensitivity of enzymes to inhibitors." @default.
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W2098491388 date "1982-11-01" @default.
W2098491388 modified "2023-09-27" @default.
W2098491388 title "Modification of Brain Mitochondrial Enzymes by the Oxygen Analogue of Ronnel at Various Stages of Development and Aging" @default.
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W2098491388 doi "https://doi.org/10.1111/j.1471-4159.1982.tb12571.x" @default.
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