title: Anti-inflammatory effect of magnolol, isolated from Magnolia officinalis, on A23187-induced pleurisy in mice.
abstract: In the present study, A23187-induced pleurisy in mice was used to investigate the anti-inflammatory effect of magnolol, a phenolic compound isolated from Chinese medicine Hou p'u (cortex of Magnolia officinalis). A23187-induced protein leakage was reduced by magnolol (10 mg kg-1, i.p.), indomethacin (10 mg kg-1, i.p.) and BW755C (30 mg kg-1, i.p.). A23187-induced polymorphonuclear (PMN) leucocyte infiltration in the pleural cavity was suppressed by magnolol and BW755C, while enhanced by indomethacin. Like BW755C, magnolol reduced both prostaglandin E2 (PGE2) and leukotriene B4 (LTB4) levels in the pleural fluid of A23187-induced pleurisy, while indomethacin reduced PGE2 but increased LTB4 formation. In the rat isolated peripheral neutrophil suspension, magnolol (3.7 microM) and BW755C (10 microM) also suppressed the A23187-induced thromboxane B2 (TXB2) and LTB4 formation. These results suggest that magnolol, like BW755C, might be a dual cyclo-oxygenase and lipoxygenase inhibitor. The inhibitory effect of magnolol on the A23187-induced pleurisy is proposed to be, at least partly, dependent on the reduction of the formation of eicosanoids mediators in the inflammatory site.
authors.affiliation: Department of Medical Research, Taichung Veterans General Hospital, Taiwan, Republic of China.
authors.forename: J P
authors.initials: JP
authors.lastname: Wang
authors.forename: T F
authors.initials: TF
authors.lastname: Ho
authors.forename: L C
authors.initials: LC
authors.lastname: Chang
authors.forename: C C
authors.initials: CC
authors.lastname: Chen
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D016718:Arachidonic Acid / Q000378:metabolism; D001713:Biphenyl Compounds / Q000494:pharmacology*; D001826:Body Fluids / Q000378:metabolism; D000001:Calcimycin / Q000633:toxicity; D015232:Dinoprostone / Q000378:metabolism; D004195:Disease Models, Animal; D007975:Leukotriene B4 / Q000378:metabolism; D017705:Lignans; D051379:Mice; D008813:Mice, Inbred ICR; D010936:Plant Extracts / Q000494:pharmacology; D010994:Pleura / Q000378:metabolism; D010998:Pleurisy / Q000139:chemically induced / Q000188:drug therapy* / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D001713:Biphenyl Compounds; D017705:Lignans; D010936:Plant Extracts; D011506:Proteins; C005498:magnolol; D007975:Leukotriene B4; D016718:Arachidonic Acid; D000001:Calcimycin; D015232:Dinoprostone