Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Effect of Dietary Vitamin $K_2$ Supplementation on Bone Mineral Density in Ovariectomized Rats

비타민 $K_2$ 첨가 식이가 난소절제쥐의 골밀도에 미치는 영향

  • Choi, Mi-Ja (Department of Food and Nutrition, Keimyung University) ;
  • Kim, Mi-Seong (Department of Food and Nutrition, Keimyung University)
  • 최미자 (계명대학교 식품영양학과) ;
  • 김미성 (계명대학교 식품영양학과)
  • Received : 2011.05.11
  • Accepted : 2011.06.12
  • Published : 2011.06.30
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Abstract

Vitamin K has been suggested to plays a role in bone metabolism. The objective of this study was to determine whether vitamin K2 supplementation is related to bone mineral density, bone formation markers, and bone resorption in ovariectomized (OVX) rats. Forty Sprague-Dawley female rats (body weight, $200{\pm}10$ g) were divided into four groups: a sham group fed a control diet, a sham group fed a vitamin K2 supplemented diet, OVX fed a control diet, and OVX fed a vitamin $K_2$ supplemented diet (3.5 mg vitamin $K_2$/kg diet). All rats were fed the experimental diets for 6 weeks, and deionized water was provided ad libitum. Serum alkaline phosphatase activity (ALP), osteocalcin, and urinary deoxypyridinoline crosslink values were measured as markers of bone formation and resorption. Bone mineral density (BMD) and bone mineral content were measured in the spine and femur using PIXImus (GE Lunar Co., Madison, WI, USA). No significant differences in body weight gain, food intake, or food efficiency ratio were observed between the control and experimental groups. Serum ALP, osteocalcin, and urinary crosslink values were not significantly different between the vitamin $K_2$ supplemented groups. No significant differences were observed for any of the variables in the sham group. Spine BMD values were significantly lower in the OVX than those in the sham groups. Spine and femur BMD per weight of vitamin $K_2$ tended to be higher than the control diet group within the OVX group, but no significant differences were observed. In conclusion, dietary vitamin $K_2$ supplementation may have a beneficial effect on spine and femur BMD in OVX rats. Further research is needed to understand the potential benefits of vitamin $K_2$ on bone loss in OVX rats.

Keywords

References

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