title: Inhibitory effects of compounds from Zingiberaceae species on platelet activating factor receptor binding.
abstract: Ten compounds isolated from Alpinia mutica Roxb., Curcuma xanthorrhiza Roxb. and Kaempferia rotunda Linn. (Family: Zingiberaceae) were investigated for their platelet-activating factor (PAF) antagonistic activities on rabbit platelets using 3H-PAF as a ligand. Among them, four compounds showed significant inhibitory effects. Alpinetin and 5,6-dehydrokawain isolated from A. mutica exhibited IC50 values of 41.6 and 59.3 microM, respectively. The IC50 values of 3-deacetylcrotepoxide and 2-hydroxy-4,4',6'-trimethoxychalcone from K. rotunda were 45.6 and 57.4 microM, respectively. 1-Methoxy-2-methyl-5-(1',5'-dimethylhex-4'-enyl)-benzene, synthesized by methylation of xanthorrhizol which was obtained from C. xanthorrhiza, showed an IC50 value of 40.9 microM. The results indicated that these compounds were relatively strong PAF receptor binding inhibitors.
authors.affiliation: Department of Pharmacy, Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia. ibj@medic.ukm.my
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Jantan
authors.forename: Mazura
authors.initials: M
authors.lastname: Pisar
authors.forename: Hasnah Mohd
authors.initials: HM
authors.lastname: Sirat
authors.forename: Norazah
authors.initials: N
authors.lastname: Basar
authors.forename: Shajarahtunnur
authors.initials: S
authors.lastname: Jamil
authors.forename: Rasadah Mat
authors.initials: RM
authors.lastname: Ali
authors.forename: Juriyati
authors.initials: J
authors.lastname: Jalil
mesh_terms: D032429:Alpinia; D000818:Animals; D001792:Blood Platelets / Q000187:drug effects* / Q000502:physiology; D030024:Curcuma; D005638:Fruit; D020128:Inhibitory Concentration 50; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D010972:Platelet Activating Factor / Q000037:antagonists & inhibitors*; D010975:Platelet Aggregation Inhibitors / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D011817:Rabbits; D027343:Rhizome; D030521:Zingiberaceae
chemical_list: D010936:Plant Extracts; D010972:Platelet Activating Factor; D010975:Platelet Aggregation Inhibitors