Summary
Intraacinar distribution of succinate dehydrogenase (SDH), malate dehydrogenase (MDH), NADP-dependent isocitrate dehydrogenase (IDH), glutamate dehydrogenase (GluDH), lactate dehydrogenase (LDH) and NADH-tetrazolium dehydrogenase (TR) was studied in rat liver cryostat sections by multipositional microphotometric activity determinations. By statistical evaluation, activity of individual enzymes could be related to the acinar topography. Activity was evaluated with regard to distance of measuring position either from afferent (portal) or efferent (hepatic) vessels. Two independent distribution curves were obtained for each enzyme. Acinar distribution of all the enzymes studied followed sigmoid courses with maximal activity of SDH, MDH and LDH in zone 1 (“periportal”) and GluDH, IDH, TR in zone 3 (“pericentral”). For all enzymes, maximum activity gradients were confined to zone 2 of the acinus. Data were also evaluated as ratios of activities in zone 1 and zone 3. The following ratios zone 1/zone 3 were obtained: SDH=1.9, MDH=1.7, IDH=0.5, GluDH=0.5, LDH=1.3 and TR=0.6.
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Wimmer, M., Pette, D. Microphotometric studies on intraacinar enzyme distribution in rat liver. Histochemistry 64, 23–33 (1979). https://doi.org/10.1007/BF00493352
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DOI: https://doi.org/10.1007/BF00493352