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Despite the high expression of 5 AMP activated protein kinase (AMPK) in heart, the activity and function of this enzyme in heart muscle has not been characterized. We demonstrate that rat hearts have a high AMPK activity, comparable to that found in liver, which could be stimulated up to 3-fold by 5 AMP. Cardiac AMPK is also under phosphorylation control, since in vitro incubation of cardiac AMPK...
We have previously shown that incubation of isolated hepatocytes with fructose leads to elevation of AMP and activation of the AMP-activated protein kinase. We now show that this treatment causes marked inactivation of HMG-CoA reductase. Using immunoprecipitation from the microsomal fraction of 32 P-labelled cells, we also show that this treatment leads to a 2.6-fold increase in the phosphorylation...
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