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- W2335557617 abstract "Hepatocytes were isolated by collagenase perfusion of livers from rats that had been allowed access to a carbohydrate-rich diet or laboratory chow or had been deprived of food 48h before use. By incubation with l-[4,5-3H]leucine and precipitation with anti-(L-type pyruvate kinase) sera the rates of synthesis and degradation of L-type pyruvate kinase were measured in freshly prepared cells and hepatocytes maintained in monolayer culture for up to 5 days. Hepatocytes from carbohydrate-rich-diet-fed rats synthesized more L-type pyruvate kinase than did cells from chow-fed animals, which in turn synthesized more than cells from 48h-starved rats. Hepatocytes maintained in culture for up to 5 days synthesized L-type pyruvate kinase at similar rates to freshly prepared cells. The degradation of [3H]leucine-labelled L-type pyruvate kinase was shown to be biphasic. A phase with t½ (half-time) 4.9h and a duration of 8–10h was followed by a phase with t½ 79.2h. Cells from chow-fed and carbohydrate-rich-diet-fed rats showed similar patterns of degradation of L-type pyruvate kinase. The addition of 2mm-fructose and 0.1μm-insulin to the culture medium increased the t½ of the rapid phase to 12h in cells isolated from carbohydrate-rich-diet-fed rats, but not in cells from chow-fed rats. The secondary, slower, phase of degradation remained unaffected. The degradation of fructose 1,6-bisphosphatase and total cell protein followed first-order kinetics. The half-life of fructose 1,6-bisphosphatase was 41.0h in cells from chow-fed animals and 48.5h in cells from carbohydrate-rich-diet-fed donors. Fructose and insulin did not affect the rate of enzyme degradation. We propose that there is a role for protein catabolism in the short-term and long-term control of L-type pyruvate kinase concentration." @default.
- W2335557617 created "2016-06-24" @default.
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- W2335557617 date "1982-04-15" @default.
- W2335557617 modified "2023-09-23" @default.
- W2335557617 title "The turnover of L-type pyruvate kinase in cultured rat hepatocytes" @default.
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- W2335557617 doi "https://doi.org/10.1042/bj2040089" @default.
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