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Hepatocytes were preincubated with 10mM-glucagon and 100 microM-corticosterone to increase phosphatidate phosphohydrolase activity. Addition of 10 nM-glucagon or 100 microM-8-bromo cyclic GMP to a second incubation mixture that contained cycloheximide increased the half-life of the phosphohydrolase activity. Dexamethasone (100 nM) had no significant effect, but insulin (500 pM) or spermine (1 mM) decreased the half-life. None of these compounds altered the general rate of degradation of proteins labelled with [3H]leucine. There appears to be a specific control of the half-life of phosphatidate phosphohydrolase activity, which could contribute to its long-term regulation in the liver.

biochemical journal

Effects of insulin, glucagon, dexamethasone, cyclic GMP and spermine on the stability of phosphatidate phosphohydrolase activity in cultured rat hepatocytes