title: Effects of a thio analog of platelet-activating factor on platelet aggregation and adenosine 3',5'-monophosphate concentration in hepatocyte suspensions and in platelets. A comparison with the naturally occurring compound.
abstract: 2-Acetyl-S-octadecyl-rac-1-thioglycero-3-phosphocholine, the thio analog of platelet-activating factor, in concentrations of 10(-6) M to 10(-12) M in the medium, lowers cAMP-concentrations in rat hepatocytes. In a concentration of 10(-4) M, the thio analog aggregates human platelets irreversibly, above 10(-5) M aggregation shows a reversible course. Compared with the saturated or unsaturated ether analogs, the thio compound shows less platelet-aggregating potency. We have correlated this difference in platelet aggregation with reduced cAMP-depressing activity of the thio analog (compared with saturated and unsaturated 2-acetyl-1-O-alkyl-sn-glycero-3-phosphocholines).
mesh_terms: D000527:Alprostadil; D000818:Animals; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism*; D000242:Cyclic AMP / Q000097:blood / Q000378:metabolism*; D006801:Humans; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007770:L-Lactate Dehydrogenase / Q000097:blood; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D010972:Platelet Activating Factor / Q000031:analogs & derivatives* / Q000494:pharmacology*; D010974:Platelet Aggregation / Q000187:drug effects*; D011458:Prostaglandins E / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
chemical_list: D010972:Platelet Activating Factor; D011458:Prostaglandins E; C041228:2-acetyl-S-octadecyl-1-thioglycero-3-phosphocholine; D000242:Cyclic AMP; D007770:L-Lactate Dehydrogenase; D000527:Alprostadil; D007213:Indomethacin