[Effect of ethinyl-estradiol on the biosynthesis and esterification of fatty acids in the rat liver].

Ethynyl-estradiol was shown to decrease the rate of biosynthesis of saturated, mono-, di-, tri- and tetraenic fatty acids in liver tissue and to increase the esterification of the newly synthesized fatty acids into triglycerides and phospholipids. The most distinct activation of esterification was found, if newly synthesized saturated fatty acids changed to triglycerides and tetraenic acids--into phospholipids. Ethynyl-estradiol stimulated also in liver tissue the esterification of exogenous saturated and unsaturated fatty acids into triglycerides and phospholipids, while relative esterification of unsaturated fatty acids into phospholipids tended to increase.