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• W2081619552 endingPage "344" @default.
• W2081619552 startingPage "332" @default.
• W2081619552 abstract "The activities of hepatic acetyl-CoA carboxylase and fatty acid synthetase undergo two distinct types of development in the perinatal chick. The first increase begins prior to hatching, continues after hatching in the starved chick, and is independent of feeding. The second increase is caused by feeding and is reversed by starvation (A. G. Goodridge (1973) J. Biol. Chem.248, 1932–1938). We have purified these enzymes to homogeneity and raised antibodies to them in rabbits. Using immunochemical techniques we have established that the activity changes in both types of development were a function of changes in the concentrations of enzyme proteins. All activity changes were accompanied by similar changes in the relative rates of synthesis of the two enzymes. Regulation of the activities of acetyl-CoA carboxylase and fatty acid synthetase was further characterized in liver cells from 19-day-old embryos maintained in culture in a chemically defined medium. After 3 days in culture in the absence of hormones, the activities of the enzymes increased significantly with respect to the activities of the freshly prepared cells. Addition of either insulin or triiodothyronine alone caused additional small increases. Insulin plus triiodothyronine caused 8- and 15-fold increases in acetyl-CoA carboxylase and fatty acid synthetase, respectively, relative to cells incubated without hormones. In the presence of insulin alone glucagon had no effect on the activity of either enzyme. In the presence of insulin plus triiodothyronine, glucagon inhibited the increase in enzyme activities by about 75%. The results of quantitative immunoprecipitin tests indicated that activity changes caused by the various hormones were functions of changes in the concentrations of the enzyme proteins. The effects of the hormones on enzyme activities were accompanied by comparable or larger changes in the relative rates of synthesis of the enzymes. Under a wide variety of experimental conditions, both in vivo and in culture, the relative rates of synthesis of acetyl-CoA carboxylase and fatty acid synthetase are regulated coordinately. Under some of these conditions, synthesis of malic enzyme also is regulated coordinately with the syntheses of acetyl-CoA carboxylase and fatty acid synthetase. The common intracellular mechanisms underlying the coordinate control remain to be elucidated." @default.
• W2081619552 created "2016-06-24" @default.
• W2081619552 creator A5034723452 @default.
• W2081619552 creator A5066103796 @default.
• W2081619552 date "1978-09-01" @default.
• W2081619552 modified "2023-10-15" @default.
• W2081619552 title "Coordinate regulation of acetyl coenzyme A carboxylase and fatty acid synthetase in liver cells of the developing chick in vivo and in culture" @default.
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• W2081619552 doi "https://doi.org/10.1016/0003-9861(78)90283-7" @default.
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