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- W2020488046 abstract "Lipopolysaccharide (LPS) treatment of resident liver macrophages resulted in a coordinated enhanced expression of cytosolic phospholipase A(2) (cPLA(2)), cyclooxygenase (COX)-2 and prostaglandin E(2)-synthase. LPS-pretreated liver macrophages showed a higher release of PGE(2) after zymosan, phorbol ester and A23187, of PGF(2alpha) after zymosan and A23187, whereas the release of thromboxane B(2) and PGD(2) was unchanged. Inhibition of COX-1 and -2 by specific inhibitors (SC560, SC236) inhibited the prostanoid release between 50-80% and 20-40%, respectively, indicating a predominant role for COX-1. In detail (1) the zymosan-induced release of all prostanoids was inhibited to a similar degree by the COX-1 inhibitor (about 70%) and the COX-2 inhibitor (20-30%), (2) PGE(2) release after all stimuli was inhibited to a greater extent by SC560 (70-90%) compared to SC236 (5-30%), (3) the phorbol ester- and A23187-induced release of PGF(2alpha) and PGD(2) was inhibited equally (40-50%) by both inhibitors, (3) TxB(2) release after phorbol ester and A23187 was inhibited by SC560 by 50 and 30%, and by SC236 by 50 and 70%, respectively. cPLA(2), COX-1 and -2, and the final prostanoid synthases were found in different subcellular fractions. These results indicate, that the functional coupling of COX-1 and -2 to final prostanoid synthases depends on the stimulation of the cells." @default.
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- W2020488046 date "2002-10-01" @default.
- W2020488046 modified "2023-09-25" @default.
- W2020488046 title "Diverse functional coupling of cyclooxygenase 1 and 2 with final prostanoid synthases in liver macrophages" @default.
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- W2020488046 doi "https://doi.org/10.1016/s0006-2952(02)01290-x" @default.
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