淫羊藿苷与金雀异黄酮骨保护作用的比较研究

Effect of icariin and genistein on bone protection

目的通过淫羊藿苷(icariin,ICA)和金雀异黄酮(genistein,GEN)对幼龄大鼠和切除卵巢大鼠的药物干预,比较其抗骨质疏松的药理活性。方法 1月龄♀SD大鼠灌服25 mg·kg-1·d-1淫羊藿苷和10 mg·kg-1·d-1金雀异黄酮3个月,6月龄SD切除卵巢大鼠灌服同样的剂量3个月,检测骨密度、股骨生物力学、血清骨钙素与抗酒石酸性磷酸酶5b和骨组织形态。结果与对照组相比较,1月龄大鼠口服淫羊藿苷后,骨密度、股骨生物力学和骨质量均增加,而金雀异黄酮效果甚微。然而,切除卵巢大鼠在口服金雀异黄酮后,比淫羊藿苷更有效的抑制了骨量丢失和骨组织微结构的退化。结论相比较金雀异黄酮,淫羊藿苷有更强的成骨活性,但雌激素活性较弱,能更强地提高幼鼠峰值骨量。切除卵巢大鼠内环境由雌激素主导,因此,金雀异黄酮比淫羊藿苷能更强地减缓骨量丢失。

Aim To compare the pharmacological ac-tivity of icariin（ ICA） and genistien （ GEN） against os-teoporosis after oral administration with them to growing rats and ovariectomized rats. Methods 25 mg·kg-1 icariin and 10 mg · kg-1 genistein （ equal in molar concentration） were administered to one-month-old fe-male SD rats every day for three months. Treatments at the same dosage were administered to the 6-month-old ovariectomized SD rats every day for three months. Their effects were compared on bone mineral density and biomechanical properties of femurs and vertebrae, serum levels of osteocalcin and tartaric acid phospha-tase 5b （ TRACP 5b） and histomorphometry. Results The results showed that, in young rats, icariin treat-ment significantly increased bone mineral density, the maximum mechanical loads of femurs and vertebrae as well as the bone qualities （ serum markers and microar-chitecture ） , whereas genistein treatment had little effects compared with the non-treatment control. How-ever, genistein treatment was more efficacious than icariin in preventing bone loss and deterioration of bone microarchitecture in ovariectomized rats. Conclusion Our data suggest that, since icariin has a higher os-teogenic activity but lower estrogenic activity, it has been found to be more efficacious than genistein in peak bone mass accrual only in young rats. In the ovariectimized rats, however, as the main force to pre-vent bone loss is the estrogenic activity, genistein has been found to be more efficacious than icariin in reduc-ing bone loss.