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In isolated hepatocytes from 24 h-starved rats, no glycogen synthesis was observed in the presence of glutamine. By contrast, glutamine was the best gluconeogenic substrate to induce glycogen synthesis in isolated hepatocytes from 72 h-starved rats. The effect of glutamine on glycogen synthesis was not accompanied by parallel changes in glucose or lactate production. Glutamine activated glycogen synthase independently of the starvation period; however, the extent of synthase activation was 2-fold higher in isolated hepatocytes from 72 h-starved rats than in hepatocytes from 24 h-starved rats. This increase in synthase activation was associated with increased cell swelling. The rate of glutamine transport was not significantly different in hepatocytes from 24 h- and 72 h-starved rats. By contrast, the intracellular glutamate concentration was 1.5-fold higher after 3 days of starvation in hepatocytes incubated with 5 mM-glutamine. We propose that glutamine may play a key role in the glycogen synthesis observed in vivo after 3 days of starvation.

Glutamine is a good substrate for glycogen synthesis in isolated hepatocytes from 72 h-starved rats, but not from 24 h- or 48 h-starved rats