title: Hepatoprotective, superoxide scavenging, and antioxidative activities of aromatic constituents from the bark of Betula platyphylla var. japonica.
abstract: The 50% aqueous methanolic extract from the bark of Betula platyphylla SUKATCHEV var. japonica (MIQ). HARA was found to show potent inhibitory activity on the liver-injury induced by CCl4 or D-galactosamine (D-GalN)/lipopolysaccharide as well as O2- scavenging and antioxidative activities. From the 50% aqueous methanolic extract, two new diarylheptanoids named betulaplatosides Ia (1) and Ib (2) and a new arylbutanoid named betulaplatoside II (3) were isolated together with seventeen known aromatic constituents. 1, 2, and two known diarylheptanoids [(5S)-5-hydroxy-1,7-bis-(4-hydroxyphenyl)-3-heptanone 5-O-beta-D-apiofurano-syl-(1-->6)-beta-D-glucopyranoside (6) and aceroside VIII (7)] showed protective activity against D-GalN-induced cytotoxicity in primary cultured rat hepatocytes. Furthermore, several aromatic constituents exhibited potent O2- scavenging and antioxidative activities.
authors.affiliation: Kyoto Pharmaceutical University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Matsuda
authors.forename: A
authors.initials: A
authors.lastname: Ishikado
authors.forename: N
authors.initials: N
authors.lastname: Nishida
authors.forename: K
authors.initials: K
authors.lastname: Ninomiya
authors.forename: H
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Y
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000302:isolation & purification / Q000494:pharmacology*; D036381:Diarylheptanoids / Q000302:isolation & purification / Q000494:pharmacology*; D004187:Disaccharides / Q000302:isolation & purification / Q000494:pharmacology*; D016166:Free Radical Scavengers / Q000302:isolation & purification / Q000494:pharmacology*; D008099:Liver / Q000187:drug effects*; D051379:Mice; D010936:Plant Extracts / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D051381:Rats; D013481:Superoxides / Q000378:metabolism*
chemical_list: D000975:Antioxidants; D036381:Diarylheptanoids; D004187:Disaccharides; D016166:Free Radical Scavengers; D010936:Plant Extracts; C000602437:aceroside VIII; D013481:Superoxides