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Evidence for a reciprocal relationship between lipogenesis and ketogenesis in hepatocytes from fed virgin and lactating rats.

Lipogenesis is increased in hepatocytes from fed lactating rats compared with virgin rats. Inhibition of lipogenesis with 5-(tetradecyloxy)-2-furoic acid resulted in increased ketogenesis from endogenous substrate, but not from oleate. Dihydroxyacetone increased ketogenesis from endogenous substrate, but not from oleate. Dihydroxyacetone increased lipogenesis and esterification of [1--14C]oleate and decreased ketogenesis; these changes were reversed by the inhibitor. The reciprocal relationship between lipogenesis and ketogenesis in hepatocytes from fed rats may be due to alterations in [malonyl-CoA] [McGarry, Mannaerts & Foster (1977) J. Clin. Invest. 60, 265--270; Cook, King & Veech (1978) J. Biol. Chem. 253, 2529--2531], but this mechanism is not considered to be sufficient to explain the increased ketogenesis in starvation completely.