姜黄素通过调节组织蛋白酶K改善高脂诱导C57BL/6J小鼠骨结构和骨质量的实验研究

摘要

Aim To investigate the effect of curcumin against high-fat-diet induced C57BL/6J mice bone changes and the correlation between the expression of cathepsin K and curcumin.Methods Curcumin treated C57BL/6J mice had been on high fat diet for 12 weeks.The HE, Alizarin red S staining and Safranin O/fast green staining of femur were employed to evaluate bone microstructure, bone metabolism and bone development.The expressions of cathepsin K were assessed by Western blot and immunohistochemical staining.Results Histopathological results showed that curcumin could improve the destruction of trabecular bone structure, cartilage development and bone calcification.Biomechanical results proved that curcumin could improve the bone strength of the type 2 diabetic mice induced by high fat.The results of immunohistochemistry and Western blot assay indicated that curcumin could significantly inhibit the expression of cathepsin K in bone tissues of mice.Conclusion Curcumin can increase bone strength, improve bone microstructure, and enhance the degree of bone calcification, which may be achieved by inhibiting the expression of cathepsin K.%目的 探讨姜黄素对高脂诱导的C57BL/6J小鼠骨结构和骨质量的影响及其与组织蛋白酶K(cathepsin K)表达的相关性.方法 用姜黄素(50 mg·kg-1)干预高脂饲料诱导的C57BL/6J小鼠骨质疏松模型12周后,取小鼠股骨和胫骨,分别用HE染色、茜素红染色和番红O /固绿染色观察骨组织微结构变化、骨代谢以及骨发育情况;用免疫组化法和Western blot法检测小鼠骨组织中组织蛋白酶K蛋白的表达.结果 病理形态学结果显示,姜黄素能明显改善高脂诱导的C57BL/6J小鼠的骨组织微结构,促进软骨发育和改善骨钙化程度;骨生物力学结果表明,姜黄素能明显提高高脂诱导C57BL/6J小鼠的骨强度;免疫组化和Western blot检测结果显示,姜黄素能够明显抑制小鼠骨组织中的组织蛋白酶K表达.结论 姜黄素能提高高脂诱导C57BL/6J小鼠的骨强度,改善骨微结构,其发挥骨保护作用机制之一可能与抑制组织蛋白酶K的表达相关.