Haidong Liang1,2,
Fang Fu3,
Bo Yuan2,
Zheng Nan Zhao2,
Chang Gui Tong2,
Xue Hui Liu2,
ShuFang Wu1
1Center for Translational Medicine, The First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, 277 West Yanta Road, Xi'an, Shaanxi 710061;
2Hands and Feet Microsurgery, The Second Hospital of Dalian Medical University, Dalian 116023, People's Republic of China;
3The Second Hospital of Dalian Medical University, Dalian 116023, People's Republic of China.
For correspondence:- ShuFang Wu
Email: sfangwu@aliyun.com Tel:+862985324555
Accepted: 14 October 2017
Published: 31 January 2018
Citation:
Liang H, Fu F, Yuan B, Zhao ZN, Tong CG, Liu XH, et al.
Effect of dietary soy isoflavones on bone loss in ovariectomized rats. Trop J Pharm Res 2018; 17(1):91-96
doi:
10.4314/tjpr.v17i1.14
© 2018 The authors.
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Abstract
Purpose: To determine the effect of dietary soy isoflavone supplementation on bone loss in ovariectomized (OVX) rats.
Methods: Forty-eight rats were assigned randomly to groups of OVX rats receiving soy isoflavones (20, 30, or 40 mg/kg of body weight daily), untreated OVX rats, or untreated intact rats. After 8 weeks, bone mineral density (BMD), mineral (Ca, P, Mn, Mg, and Zn) concentrations, and the expression of osteoblast-related genes were measured in femur tissue samples.
Results: Eight weeks after OVX, there was a significant decrease in body weight, serum levels of osteocalcin, alkaline phosphatase, and oestradiol, BMD and mineral elements, as well as the expressions of Ctnnb1, Runx2, and Sp7 (all p < 0.05). These decreases were accompanied by reduced maximum load capacity of lumbar vertebrae. Daily supplementation with soy isoflavones dose-dependently ameliorated these effects (all p < 0.05). Western blotting revealed that these effects were likely due to the reversal of the OVX-induced decrease in Notch1 proteins in bone and muscle.
Conclusion: Soy isoflavone treatment represents a potential therapy for preventing postmenopausal bone loss by stimulating the Notch signalling
Keywords: Mineral elements, Alkaline phosphatase, Isoflavones, Bone loss, Notch pathway