title: Inhibitory activity of Juniperus communis on 12(S)-HETE production in human platelets.
abstract: Extracts of Juniperus communis L. (Cupressaceae) have been evaluated for their inhibitory activity on human platelet-type 12(S)-lipoxygenase [12(S)-LOX]. The methylene chloride extracts of Juniperi lignum, Juniperi pseudo-fructus and the ethyl acetate extract of Juniperi pseudo-fructus showed a significant inhibition on the production of 12(S)-HETE [12(S)-hydroxy-5,8,10,14-eicosatetraenoic acid] at 100 microg/mL (54.0 +/- 6.73, 66.2 +/- 4.03 and 76.2 +/- 3.36%, respectively). From the methylene chloride extract of the wood, cryptojaponol and beta-sitosterol were isolated as compounds with inhibitory activity (inhibition at 100 microg/mL = 55.4 +/- 2.80% [IC50 = 257.5 microM] and 25.0 +/- 2.15%, respectively). In addition, a lipid fraction containing unsaturated fatty acids contributed to the in vitro activity of the crude extract.
authors.affiliation: Institute of Pharmacognosy, Karl-Franzens-University, Graz, Austria.
authors.forename: Isabella
authors.initials: I
authors.lastname: Schneider
authors.forename: Simon
authors.initials: S
authors.lastname: Gibbons
authors.forename: Franz
authors.initials: F
authors.lastname: Bucar
mesh_terms: D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid / Q000378:metabolism*; D000818:Animals; D001156:Artemia / Q000187:drug effects; D001792:Blood Platelets / Q000187:drug effects* / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005638:Fruit; D006367:HeLa Cells / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D018653:Juniperus; D008084:Lipoxygenase / Q000187:drug effects*; D016859:Lipoxygenase Inhibitors / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D014934:Wood
chemical_list: D016859:Lipoxygenase Inhibitors; D010936:Plant Extracts; D019377:12-Hydroxy-5,8,10,14-eicosatetraenoic Acid; D008084:Lipoxygenase