title: Prolonged intake of fermented soybean (natto) diets containing vitamin K2 (menaquinone-7) prevents bone loss in ovariectomized rats.
abstract: The effect of the prolonged intake of dietary vitamin K2 (menaquinone-7, MK-7) on bone loss in ovariectomized (OVX) rats was investigated. OVX rats were freely given experimental diets containing the fermented soybean (natto; including 9.4 micrograms MK-7/100 g diet) without or with supplemental MK-7 (containing 14.1 or 18.8 micrograms of MK-7 as total per 100 g diet) for 150 days. Feeding produced a significant elevation of MK-7 concentration in the serum of OVX rats. In this case, the femoral MK-4 content was significantly increased, but MK-7 was not detected in the femoral tissues, indicating degradation of MK-7. Serum gamma-carboxylated osteocalcin concentration was significantly decreased by OVX. This decrease was significantly prevented by the feeding of the natto diets with supplemental MK-7 (18.8 micrograms/100 g diets). OVX caused a significant decrease in femoral dry weight, femoral calcium content, and mineral density. These decreases were significantly prevented by feeding with diets containing natto with MK-7 (total, 18.8 micrograms/100 g diets). This study demonstrates that the prolonged intake of natto dietary including MK-7 has a preventive effect on bone loss induced by OVX. Dietary MK-7 may be useful in the prevention of osteoporosis.
authors.affiliation: Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: H
authors.initials: H
authors.lastname: Kakuda
authors.forename: Y H
authors.initials: YH
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Tsukamoto
mesh_terms: D000821:Animal Feed; D000818:Animals; D015519:Bone Density / Q000187:drug effects*; D002118:Calcium / Q000378:metabolism; D004032:Diet; D005260:Female; D005269:Femur / Q000187:drug effects / Q000473:pathology; D005285:Fermentation; D006801:Humans; D009929:Organ Size / Q000187:drug effects; D015675:Osteocalcin / Q000097:blood; D015663:Osteoporosis, Postmenopausal / Q000178:diet therapy / Q000517:prevention & control*; D010052:Ovariectomy; D051381:Rats; D017208:Rats, Wistar; D013025:Glycine max; D014812:Vitamin K / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D024482:Vitamin K 2 / Q000031:analogs & derivatives
chemical_list: D015675:Osteocalcin; D024482:Vitamin K 2; D014812:Vitamin K; C030814:menatetrenone; C062629:menaquinone 7; D002118:Calcium