title: Therapeutic reduction of ongoing carrageenin-induced inflammation by lipoxygenase, but not cyclooxygenase inhibitors.
abstract: A variety of steroidal and nonsteroidal antiinflammatory agents (NSAs) were compared for their effectiveness against a developing acute inflammatory reaction. Only BW 755C [3-amino-1-(m-trifluoromethyl)-phenyl-2-pyrazole] was immediately effective when administered 2 h after carrageenin, as the 3-h swelling was significantly reduced. Dexamethasone, a steroidal antiinflammatory agent, produced a delayed reduction. When administered at 2 h postcarrageenin, there was no effect at 3 h; but at 6 h, dexamethasone significantly reduced the swelling. In contrast, neither of the classic NSAs, aspirin or indomethacin, were effective when administered after the carrageenin. The results demonstrating a postcarrageenin effectiveness by BW 755C and dexamethasone are discussed as a possible reflection of an action on the lipoxygenase pathways of the arachidonic cascade that is not shared by the classic NSA.
mesh_terms: D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D000818:Animals; D001241:Aspirin / Q000627:therapeutic use; D002351:Carrageenan; D016861:Cyclooxygenase Inhibitors; D007213:Indomethacin / Q000627:therapeutic use; D007249:Inflammation / Q000139:chemically induced / Q000517:prevention & control*; D008084:Lipoxygenase / Q000627:therapeutic use*; D008297:Male; D011720:Pyrazoles / Q000627:therapeutic use; D051381:Rats; D013997:Time Factors
chemical_list: D016861:Cyclooxygenase Inhibitors; D011720:Pyrazoles; D015772:4,5-Dihydro-1-(3-(trifluoromethyl)phenyl)-1H-pyrazol-3-amine; D002351:Carrageenan; D008084:Lipoxygenase; D001241:Aspirin; D007213:Indomethacin