title: Oral contraceptives, lanosterol, and platelet hyperactivity in rat.
abstract: Lanosterol, a cholesterol precursor that increases considerably in the platelets of rats treated with oral contraceptives, was incubated with either platelet-rich plasma or washed platelet suspension. After 2 minutes there was a remarkable dose-related increase in platelet activity. This platelet hyperactivity was measured by clotting time and platelet aggregation could not be reproduced by cholesterol or ethinylestradiol.
mesh_terms: D000818:Animals; D001777:Blood Coagulation / Q000187:drug effects*; D001792:Blood Platelets / Q000187:drug effects*; D003276:Contraceptives, Oral / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D007810:Lanosterol / Q000494:pharmacology*; D010974:Platelet Aggregation / Q000187:drug effects*; D051381:Rats
chemical_list: D003276:Contraceptives, Oral; D007810:Lanosterol