International Journal of Industrial Entomology and Biomaterials

Korean Society of Sericultural Science (한국잠사학회)
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Effects of silk fibroin hydrolysate on bone metabolism in ovariectomized rats

  • Kweon, HaeYong (Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, RDA) ;
  • Shin, Sun Hee (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Chon, Jeong-Woo (Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, RDA) ;
  • Lee, Kwang-Gill (Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, RDA) ;
  • Jo, You-Young (Sericultural and Apicultural Materials Division, National Academy of Agricultural Science, RDA) ;
  • Yoon, Ji Young (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Park, Yoo-Kyoung (Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University) ;
  • Jeon, Jong-Young (School of Textile Engineering and Fashion Design, Kyungpook National University) ;
  • Kim, Jong-Ho (School of Textile Engineering and Fashion Design, Kyungpook National University) ;
  • Shin, Bong-Seob (School of Textile Engineering and Fashion Design, Kyungpook National University)
  • Received : 2015.02.05
  • Accepted : 2015.03.24
  • Published : 2015.03.31
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Abstract

This study aimed to investigate the effects of silk fibroin on bone metabolism in ovariectomized rats. A total of 30 Sprague-Dawley rats were randomized into sham-operated (SHAM), ovariectomized control (OVX), alendronate (OVX+ALEN, 10 mg/kg body weight/d), low silk fibroin (OVX+SF100, 100 mg/kg body weight/d), and high silk fibroin (OVX+SF300, 300 mg/kg body weight/d) groups. All the rats were fed by gavage for 12 wk. At the end of 12 wk, blood and urine were collected for analysis of bone turnover markers, and bone mineral density (BMD) was measured by micro-computed tomography. The results show that the OVX group (p < 0.05) displayed the highest mean body weight gain. Among the five groups, serum levels of bone alkaline phosphatase (ALP) and urine levels of deoxypyridinoline (DPD) were highest in the OVX group (p < 0.05). Bone ALP levels in the ALEN group were significantly lower than that of the silk-treated groups. On the other hand, DPD levels were not significantly different between the ALEN and silk-fibroin-treated groups (p < 0.05). The trabecular BMD was significantly higher in the ALEN and silk-treated groups compared to the OVX group (p < 0.05). In conclusion, this study showed that silk fibroin has similar effects as alendronate, which is used in osteoporosis medication. Therefore silk fibroin might be a new candidate for the prevention and treatment of osteoporosis in patients.

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References

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