Inactivation of platelet-activating factor in plasma.
نویسندگان
چکیده
منابع مشابه
Human plasma platelet-activating factor acetylhydrolase.
Platelet-activating factor (PAF, 1-0-alkyl-2-acetylsn-glycero-3-phosphocholine) is a biologically active phospholipid synthesized by a variety of cell types upon appropriate stimulation. PAF is a potent hypotensive factor and it activates platelets and inflammatory cells at concentrations as low as 10”’ M. Removal of the acetyl moiety at the sn-2 position abolishes the biological activity and t...
متن کاملHuman Plasma Platelet-activating Factor Acetylhydrolase
Human plasma platelet-activating factor (PAF) acetylhydrolase hydrolyzes the sn-2 acetyl residue of PAF, but not phospholipids with long chain sn-2 residues. It is associated with low density lipoprotein (LDL) particles, and is the LDL-associated phospholipase A, activity that specifically degrades oxidatively damaged phospholipids (Stremler, K. E., Stafforini, D. M., Prescott, S. M., Zimmerman...
متن کاملMolecular basis for susceptibility of plasma platelet-activating factor acetylhydrolase to oxidative inactivation.
Platelet-activating factor acetylhydrolase (PAF-AH) is a phospholipase A2 that inactivates potent lipid messengers, such as PAF and modified phospholipids generated in settings of oxidant stress. The catalytic activity of PAF-AH is sensitive to oxidants, a feature that may have pathological consequences. We report that peroxynitrite, an oxidant species generated after cellular activation, media...
متن کاملPlatelet-activating factor inactivation by local expression of platelet-activating factor acetyl-hydrolase modifies tumor vascularization and growth.
PURPOSE Platelet-activating factor (PAF), a phospholipid mediator of inflammation, has been recently detected on tumor cells but its effect in tumor development is largely undefined. EXPERIMENTAL DESIGN To address its potential role in tumor biology, we inhibited intratumor PAF activity by engineering tumor cell lines to express plasma PAF-acetylhydrolase (PAF-AH), the major PAF-inactivating ...
متن کاملHuman plasma platelet-activating factor acetylhydrolase. Association with lipoprotein particles and role in the degradation of platelet-activating factor.
Platelet-activating factor (PAF) is a bioactive phospholipid (1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine) synthesized by a variety of mammalian cell types. PAF induces hypotension, and activates neutrophils and platelets, among other actions. Removal of the acetyl moiety abolishes biological activity, so this reaction may regulate the concentration of PAF and its physiological effects. We h...
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ژورنال
عنوان ژورنال: Blood & Vessel
سال: 1986
ISSN: 0386-9717,1884-2372
DOI: 10.2491/jjsth1970.17.158