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The activities of NAD-specific and NADP-specific isocitrate dehydrogenases were measured in early and term human placenta. In both tissues the activity of NADP-specific isocitrate dehydrogenase was severalfold higher than that of the NAD-dependent enzyme. Subcellular distribution of these two enzymes in the placental tissue was estimated. About 60% of the total NADP-specific isocitrate dehydrogenase activity was found in the mitochondrial fraction and about 40% in the cytosol fraction. Insignificant amounts of the total activity were bound to the microsomal fraction. The whole of the NAD-specific isocitrate dehydrogenase activity was localized in the mitochondrial fraction. The total mitochondrial NADP-specific isocitrate dehydrogenase activity in both early and term placenta was also estimated from the mitochondrial specific activity of this enzyme and the amount of mitochondrial protein in wet tissue, calculated from the activities of citrate synthase or cytochrome c oxidase assayed in the isolated mitochondrial fraction and in the tissue of early and term human placenta.

Subcellular distribution of isocitrate dehydrogenase in early and term human placenta