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J. Biol. Chem., Vol. 264, Issue 12, 6612-6614, Apr, 1989

Estrogen treatment increases phospholipid transfer activities in chicken liver

AE Rusinol and B Bloj
Departamento de Bioquimica de la Nutricion, Universidad Nacional de Tucuman-Consejo Nacional de Investigaciones Cientificas y Tenicas, Tucuman, Republica Argentina.

The effect of subcutaneous beta-estradiol injection on liver phosphatidylcholine, phosphatidylethanolamine and phosphatidylinositol transfer activity of immature chicken has been determined. The estrogen administration significantly enhanced the transfer activity of both phosphatidylcholine (100%), phosphatidylethanolamine (160%), and phosphatidylinositol (150%). In vivo experiments revealed that the hormone-induced changes in liver lipid transfer activity were sensitive to a protein synthesis inhibitor, cycloheximide. A partial characterization of liver protein transfer on Sephacryl S-200 showed that multiple transfer proteins are involved in the beta-estradiol effect. This is the first time that hormonal modulation of phospholipid transfer activities is described, and the results suggest that the hepatic phospholipid transfer activities might be involved in the biosynthesis of plasma lipoproteins in vivo.
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