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In adult male and female rat liver, the activity of NAD(+)-and NADP(+)-dependent glutamate dehydrogenase (GDH) was microquantitatively measured in tissue samples of 50-150 ng, microdissected continuously along the sinusoidal length. Total activity of GDH with NAD+ as co-factor was found to be higher by a ratio of about 1:2.3 than with NADP+. All intra-acinar enzyme profiles, irrespective of sex, showed an increasing gradient of GDH activity from the periportal beginning to the perivenous end. These findings are at variance with the immunohistochemical localization of GDH in rat liver. The microquantitative GDH profiles with higher perivenous values could indicate a more pronounced glutamine synthesis in Zone 3 of the liver acinus.

Microquantitative analysis of the intra-acinar profiles of glutamate dehydrogenase in rat liver.