title: In vivo anti-osteoporotic activity of isotaxiresinol, a lignan from wood of Taxus yunnanensis.
abstract: Isotaxiresinol, the main lignan isolated from the water extract of wood of Taxus yunnanensis, was investigated for its effect on bone loss, on serum biochemical markers for bone remodeling and on uterine tissue, using ovariectomized (OVX) rats as the model of postmenopausal osteoporosis. After oral administration of isotaxiresinol (50 and 100mg/kg/d) for 6 weeks, bone mineral content (BMC) and bone mineral density (BMD) in total and cortical bones were increased as compared to those of OVX control rats, and decreases of three bone strength indexes induced by OVX surgery were prevented. Serum biochemical markers for bone remodeling revealed that isotaxiresinol slightly increased bone formation and significantly inhibited bone resorption without side effect on uterine tissue. These results suggest that isotaxiresinol may be useful for treatment of postmenopausal osteoporosis, especially for prevention of bone fracture induced by estrogen deficiency.
authors.affiliation: Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Yin
authors.forename: Y
authors.initials: Y
authors.lastname: Tezuka
authors.lastname: Subehan
authors.forename: L
authors.initials: L
authors.lastname: Shi
authors.forename: M
authors.initials: M
authors.lastname: Nobukawa
authors.forename: T
authors.initials: T
authors.lastname: Nobukawa
authors.forename: S
authors.initials: S
authors.lastname: Kadota
mesh_terms: D000818:Animals; D001835:Body Weight; D015519:Bone Density / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D017705:Lignans / Q000009:adverse effects / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use*; D015394:Molecular Structure; D010024:Osteoporosis / Q000188:drug therapy*; D010052:Ovariectomy; D051381:Rats; D017208:Rats, Wistar; D020946:Taxus / Q000737:chemistry*
chemical_list: D017705:Lignans; C508339:isotaxiresinol