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- W2118071127 abstract "Abstract Two kinds of phospholipids in normal rat uterus were found to inhibit the aggregation of washed rabbit platelets induced by 1-alkyl-2-acetyl-sn-glycero-3-phosphocholine (alkylacetyl-GPC) and were named Inhibitor I and Inhibitor II and identified by mass spectrometry. Inhibitor I was a mixture of 1-acyl (16:0, 18:0, 18:1, 18:2, and 20:4)-2-lyso-sn-glycero-3-phosphocholine (acyllyso-GPC) and 1-alkyl (16:0, 18:0, and 18:1)-2-lyso-sn-glycero-3-phosphocholine (alkyllyso-GPC). 16:0 acyllyso-GPC was the most inhibitory, followed by 18:1, 18:2, 20:4, and 18:0 acyllyso-GPCs and 16:0 alkyllyso-GPC. Their IC50 values were in the range of 1-4 X 10(-5) M against the platelet aggregation induced by 1 X 10(-10) M 16:0 alkylacetyl-GPC, indicating that they were about 100 times weaker inhibitors than CV-3988. Inhibitor II was a mixture of N-acyl sphing-4-enyl phosphocholine (18:1/18:0, 18:1/20:0, 18:1/24:0, and 18:1/24:2). The most inhibitory of these components were 18:1/20:0 and 18:1/24:0, followed by 18:1/24:2 and 18:1/18:0, and their IC50 values were in the range of 4-5 X 10(-5) M against platelet aggregation induced by the alkylacetyl-GPC. Quantitatively, about 10(5) times higher concentrations of these inhibitors should be necessary to inhibit platelet aggregation induced by 1 X 10(-10) M 16:0 alkylacetyl-GPC. In fact, the contents of Inhibitors I and II, respectively, were approximately 10(5) times (4.7 X 10(-2) and 7.1 X 10(-2) mol/mol lipid-phosphorus of the original uterine phospholipids) than that of 16:0 alkylacetyl-GPC (1.4 X 10(-6) mol/mol lipid-phosphorus). The role of alkylacetyl-GPC in normal rat uterus is uncertain, but it coexists in situ with two kinds of endogenous inhibitors, choline containing lysoglycerophospholipids and sphingophospholipids." @default.
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- W2118071127 date "1987-09-01" @default.
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- W2118071127 title "Existence of endogenous inhibitors of platelet-activating factor (PAF) with PAF in rat uterus." @default.
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- W2118071127 doi "https://doi.org/10.1016/s0021-9258(18)45184-8" @default.
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