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- W1485296430 abstract "When monocytes mature to macrophages, their ability to accumulate the pro-inflammatory lipid autacoid, platelet-activating factor (PAF), is markedly decreased (Elstad, M. R. Stafforini, D. M., McIntyre, T. M., Prescott, S. M., and Zimmerman, G. A. (1989) J. Biol. Chem. 264, 8467-8470) in conjunction with a 260-fold increase in the activity of intracellular PAF acetylhydrolase (PAF-AH). We now demonstrate that macrophages also secrete PAF-AH and that the secreted enzyme is biochemically and immunologically identical to the human plasma PAF-AH. It is sensitive to the same active-site-directed inhibitors, has the same electrophoretic mobility, is associated with lipoprotein particles, and transfers between low density lipoprotein and high density lipoprotein in a pH-dependent manner like the plasma PAF-AH. In addition, both activities hydrolyze oxidatively fragmented phospholipids and PAF. These data indicate that macrophages are a cellular source of the plasma PAF-AH. Thus, macrophages secrete an enzyme that inactivates lipid mediators at sites of inflammation and in plasma. These changes during the maturation of monocytes to macrophages may serve to limit the acute inflammatory response." @default.
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- W1485296430 date "1990-06-01" @default.
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- W1485296430 title "Human macrophages secret platelet-activating factor acetylhydrolase." @default.
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- W1485296430 doi "https://doi.org/10.1016/s0021-9258(19)38724-1" @default.
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