Abstract
1. The degradation rates and half-lives of hexokinase, 6-phosphogluconate dehydrogenase, lactate dehydrogenase, pyruvate kinase, glucose 6-phosphate dehydrogenase, phosphoglycerate kinase and aldolase were calculated from measurements of the decline in activities of these enzymes in rat small intestine during starvation. 2. The half-lives of the enzymes are: hexokinase, 5.7h; 6-phosphogluconate dehydrogenase, 7.6h; glucose 6-phosphate dehydrogenase, 6.0h; pyruvate kinase, 8.9h; lactate dehydrogenase, 8.7h; phosphoglycerate kinase, 8.7h; aldolase, 5.1h. 3. The significance of the results is discussed with respect to the regulation of enzyme concentrations in response to changes in diet.
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- Anderson J. W., Zakim D. The influence of alloxan-diabetes and fasting on glycolytic and gluconeogenic enzyme activities of rat intestinal mucosa and liver. Biochim Biophys Acta. 1970 Feb 24;201(2):236–241. doi: 10.1016/0304-4165(70)90297-7. [DOI] [PubMed] [Google Scholar]
- BERTALANFFY F. D. Mitotic rates and renewal times of the digestive tract epithelia in the rat. Acta Anat (Basel) 1960;40:130–148. doi: 10.1159/000141580. [DOI] [PubMed] [Google Scholar]
- Creamer B. The turnover of the epithelium of the small intestine. Br Med Bull. 1967 Sep;23(3):226–230. doi: 10.1093/oxfordjournals.bmb.a070561. [DOI] [PubMed] [Google Scholar]
- Fritz P. J., Vesell E. S., White E. L., Pruitt K. M. The roles of synthesis and degradation in determining tissue concentrations of lactate dehydrogenase-5. Proc Natl Acad Sci U S A. 1969 Feb;62(2):558–565. doi: 10.1073/pnas.62.2.558. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Haining J. L. On the kinetics of liver enzyme regression following induction. Arch Biochem Biophys. 1971 May;144(1):204–208. doi: 10.1016/0003-9861(71)90469-3. [DOI] [PubMed] [Google Scholar]
- Hübscher G., West G. R., Brindley D. N. Studies on the fractionation of mucosal homogenates from the small intestine. Biochem J. 1965 Dec;97(3):629–642. doi: 10.1042/bj0970629. [DOI] [PMC free article] [PubMed] [Google Scholar]
- James W. P., Alpers D. H., Gerber J. E., Isselbacher K. J. The turnover of disaccharidases and brush border proteins in rat intestine. Biochim Biophys Acta. 1971 Feb 23;230(2):194–203. doi: 10.1016/0304-4165(71)90204-2. [DOI] [PubMed] [Google Scholar]
- Kuehl L., Sumsion E. N. Turnover of several glycolytic enzymes in rat liver. J Biol Chem. 1970 Dec 25;245(24):6616–6623. [PubMed] [Google Scholar]
- Rudack D., Chisholm E. M., Holten D. Rat liver glucose 6-phosphate dehydrogenase. Regulation by carbohydrate diet and insulin. J Biol Chem. 1971 Mar 10;246(5):1249–1254. [PubMed] [Google Scholar]
- Rudack D., Gozukara E. M., Chisholm E. M., Holten D. The effect of dietary carbohydrate and fat on the synthesis of rat liver 6-phosphogluconate dehydrogenase. Biochim Biophys Acta. 1971 Nov 12;252(2):305–313. doi: 10.1016/0304-4165(71)90011-0. [DOI] [PubMed] [Google Scholar]
- Srivastava L. M., Hübscher G. Glucose metabolism in the mucosa of the small intestine. Enzymes of the pentose phosphate pathway. Biochem J. 1966 Oct;101(1):48–55. doi: 10.1042/bj1010048. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Srivastava L. M., Shakespeare P., Hübscher G. Glucose metabolism in the mucosa of the small intestine. A study of hexokinase activity. Biochem J. 1968 Aug;109(1):35–42. doi: 10.1042/bj1090035. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Szepesi B., Freedland R. A. Time course of enzyme adaptation. 3. Periodic and nonperiodic responses of rat liver enzyme activities to diets in meal-fed rats. Can J Biochem. 1971 Jan;49(1):108–118. doi: 10.1139/o71-016. [DOI] [PubMed] [Google Scholar]