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[Acyl and plasmalogen analogs of platelet activating factor--new lipid cellular bioregulators].

Recent data concerning two structural platelet-activating factor (PAF) analogs-1-O-acyl-2-acetyl-sn-glycero-3-phosphocholine (acyl-PAF) and 1-O-alk-1'-enyl-2-acetyl-sn-glycero-3-phosphocholine (vinyl-PAF) identified in some cells and tissues are reviewed. Isolation, identification, biosynthesis, and metabolism of acyl-PAF and vinyl-PAF are considered. The activity of acyl-PAF and vinyl-PAF towards platelets, leukocytes, isolated myocardium, and ileum as well as its in vivo activity are discussed. The influence of acyl-PAF and vinyl-PAF on PAF platelet interaction, Ca2+ mobilization, and platelet adenylate cyclase activity is considered. It is concluded that similar to PAF, acyl-PAF and vinyl-PAF should be regarded as a family of PAF lipid bioregulators.

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