Inhibitory Effect of Vitamin K2 (Menatetrenone) on Bone Resorption in Ovariectomized Rats: A Histomorphometric and Dual Energy X-Ray Absorptiometric Study

The Japanese Journal of Pharmacology

Kuniko Hara²  Masatoshi Kobayashi²  Takashi Tomiuga²  Yasuhiro Akiyama²  Tetsuya Nakamura¹ 

[1] Vitamin E Information and Technology Section, Eisai Co., Ltd.;Department of Applied Drug Research, Eisai Co., Ltd.

关键词: Vitamin K2;    Ovariectomy;    Bone mineral density;    Histomorphometry;    Osteoclast number;   

DOI  :  10.1254/jjp.80.67

学科分类：药理学

来源: Nihon Yakuri Gakkai Henshuubu / Japanese Pharmacological Society

【 摘 要 】

References(25)Cited-By(31)To clarify how vitamin K2 prevents bone loss in vivo, it was given to ovariectomized 20-week-old rats for 2 weeks. Bone mineral density (BMD) in the whole femur and in 7 specific portions (F1 to F7 from the proximal to the distal end) was determined by dual-energy X-ray absorptiometry, and histomorphometry was also performed in proximal tibial metaphysis. Ovariectomy (OVX) resulted in significant decreases in the BMD in the whole femur and the F1, F2, F6 and F7 portions. Histomorphometrical analysis of the tibia showed that the bone volume / tissue volume (BV/TV), trabecular thickness (Tb.Th) and trabecular number (Tb.N) were decreased, while trabecular separation (Tb.Sp) and osteoclast number / bone surface (Oc.N/BS) were increased by OVX. The parameters for bone formation were not changed by OVX. These data indicate that the bone loss within 2 weeks is due to the enhancement of bone resorption. Vitamin K2 at 50 mg/kg inhibited the decrease in the BMD of the whole femur together with the F6 and F7 portions. Vitamin K2 also inhibited the decrease in Tb.N and the increases in Tb.Sp, Oc.N/BS and osteoclast surface / bone surface (Oc.S/BS) caused by OVX. These results suggest that vitamin K2 prevents bone loss through the inhibition of bone resorption and osteoclast formation in vivo.

【 授权许可】

Unknown