title: Prenylated flavonoids of the leaves of Macaranga conifera with inhibitory activity against cyclooxygenase-2.
abstract: Two prenylated flavonoid derivatives, 5-hydroxy-4'-methoxy-2",2"-dimethylpyrano-(7,8:6",5")flavanone (1) and 5,4'-dihydroxy-[2"-(1-hydroxy-1-methylethyl)dihydrofurano]-(7,8:5",4")flavanone (2), were isolated from an ethyl acetate-soluble extract of the leaves of Macaranga conifera using an in vitro activity-guided fractionation procedure based on the inhibition of cyclooxygenase-2. Also obtained were eight known compounds, 5,7-dihydroxy-4'-methoxy-8-(3-methylbut-2-enyl)flavanone (3), lonchocarpol A (4), sophoraflavanone B (5), 5,7-dihydroxy-4'-methoxy-8-(2-hydroxy-3-methylbut-3-enyl)flavanone (6), tomentosanol D (7), lupinifolinol (8), isolicoflavonol (9), and 20-epibryonolic acid (10). The structures of compounds 1 and 2 were determined using spectroscopic methods. All isolates were tested for their inhibitory effects against both cyclooxygenases-1 and -2, and selected compounds were evaluated in a mouse mammary organ culture assay.
authors.affiliation: Program for Collaborative Research in the Pharmaceutical Sciences and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, 833 South Wood Street, Chicago, IL 60612, USA.
authors.forename: Dae Sik
authors.initials: DS
authors.lastname: Jang
authors.forename: Muriel
authors.initials: M
authors.lastname: Cuendet
authors.forename: Michael E
authors.initials: ME
authors.lastname: Hawthorne
authors.forename: Leonardus B S
authors.initials: LB
authors.lastname: Kardono
authors.forename: Kazuko
authors.initials: K
authors.lastname: Kawanishi
authors.forename: Harry H S
authors.initials: HH
authors.lastname: Fong
authors.forename: Rajendra G
authors.initials: RG
authors.lastname: Mehta
authors.forename: John M
authors.initials: JM
authors.lastname: Pezzuto
authors.forename: A Douglas
authors.initials: AD
authors.lastname: Kinghorn
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D005591:Chemical Fractionation / Q000379:methods; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D019665:Euphorbiaceae / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D007527:Isoenzymes / Q000037:antagonists & inhibitors*; D008325:Mammary Neoplasms, Experimental / Q000188:drug therapy / Q000201:enzymology; D008565:Membrane Proteins; D051379:Mice; D008807:Mice, Inbred BALB C; D019906:Nuclear Magnetic Resonance, Biomolecular; D009924:Organ Culture Techniques; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D011451:Prostaglandin-Endoperoxide Synthases; D017368:Protein Prenylation
chemical_list: D000970:Antineoplastic Agents; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D005419:Flavonoids; D007527:Isoenzymes; D008565:Membrane Proteins; D010936:Plant Extracts; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases; C496512:Ptgs1 protein, mouse