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The hepatotoxicity of orally administered secondary autoxidation products of linoleic acid was investigated, as compared with the administration of a saline solution and linoleic acid as controls. The de novo synthesis of fatty acids was strongly reduced in the secondary products group. The level of NADPH in the liver significantly decreased while that of NADH did not. The activities of glucose-6-phosphate dehydrogenase and phosphogluconate dehydrogenase apparently decreased. The activities of NAD+ kinase and NAD+ synthetase decreased and that of NAD+ nucleosidase increased in the secondary products group. Therefore, the depletion of NADPH can be attributed to the inhibition of two metabolic systems (an NADPH-supplemental system, and a synthetic system of NADP and NAD), and resulted in the reduction of lipogenesis in the liver.

Decrease of the NADPH level in rat liver on oral administration of secondary autoxidation products of linoleic acid.