Platelet-activating factor in normal rat uterus

Platelet-activating factor (PAF) was found in normal rat uterus and identified as 1-0-hexadecyl/octadecenyl-2-acetyl-sn-glycero-3-phosphocholine. PAF was purified by several successive chromatographic procedures. It showed platelet aggregating activity, which was inhibited by CV 3988, and had no effect on platelets desensitized with 1-0-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine. The tert-butyldimethyl-silylderivative of 1-0-alkyl-2-acetyl-sn-glycerol, which was obtained by hydrolysis of uterine PAF with phospholipase C, was analyzed by gas chromatography-mass spectrometry. One rat uterus contained approximately 21.3 ng of 1-0-hexadecyl-2-acetyl-sn-glycero-3-phosphocholine. This is the first report of the occurrence of a significant amount of PAF in a normal animal tissue.