Abstract
In hepatocytes isolated from meal-fed rats, phorbol 12-myristate 13-acetate as well as phorbol 12,13-didecanoate stimulated de novo fatty acid synthesis in a dose-dependent manner. Moreover, phorbol 12-myristate 13-acetate inhibited ketogenesis from exogenous oleate, but slightly enhanced oleate esterification. The stimulation of esterification was more pronounced with endogenously synthesized fatty acids. In hepatocytes from 24h-starved rats a moderate stimulation of gluconeogenesis and ureogenesis was observed with glutamine as substrate. It is concluded that tumor-promoting phorbol esters mimick the short-term effects of insulin on hepatic fatty acid metabolism.
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