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The protective effect of dietary L-glutamine against the hepatotoxic action of D-galactosamine (GaIN) was investigated by model experiments with rats. Rats fed with 20% casein diets containing 10% free amino acids were injected with GaIN, and the serum aspartate aminotransferase, alanine aminotransferase and lactate dehydrogenase activities and the hepatic glycogen content were assayed 20 hours after the injection. These enzyme activities in the group fed with 10% L-glutamine diet for 8 days were lower than those in the groups fed with the control, 10% L-glutamic acid and 10% L-alanine diets for 8 days. The more prolonged the feeding period with the 10% L-glutamine diet was, the more the serum activity levels of such enzymes were decreased. Although neomycin also lowered these enzyme activities, its simultaneous ingestion with neomycin did not show any additive or synergistic effect. The hepatic glycogen content in the 10% glutamine group still remained high after the GaIN treatment. It is therefore assumed that the effectiveness of glutamine intake would have been mediated by glycogen metabolism rather than by uridine metabolism.

Effect of Dietaryl-Glutamine on the Hepatotoxic Action ofd-Galactosamine in Rats