吉林大学学报(医学版) ›› 2021, Vol. 47 ›› Issue (4): 857-864.doi: 10.13481/j.1671-587X.20210406

• 基础研究 • 上一篇    下一篇

雌二醇联合1,25-二羟维生素D3对绝经后骨质疏松症大鼠的治疗作用

李希宁1,翁伟2,沈哲源2,豆晓杰2,闵继康2()   

  1. 1.湖州师范学院医学院病理学教研室,浙江 湖州 313000
    2.湖州师范学院附属第一医院骨科,浙江 湖州 313000
  • 收稿日期:2020-11-08 出版日期:2021-07-28 发布日期:2021-07-22
  • 通讯作者: 闵继康 E-mail:2504074093@qq.com
  • 作者简介:李希宁(1986-),男,山东省泰安市人,讲师,医学博士,主要从事代谢性骨病发病机制方面的研究。
  • 基金资助:
    国家自然科学基金项目(81602805);浙江省科技厅自然科学基金项目(GF19H060008)

Therapeutic effect of estradiol combined with 1,25-dihydroxyvitamin D3 on postmenopausal osteoporosis in rats

Xining LI1,Wei WENG2,Zheyuan SHEN2,Xiaojie DOU2,Jikang MIN2()   

  1. 1.Department of Pathology,School of Medical Sciences,Huzhou University,Huzhou 313000,China
    2.Department of Orthopedics,First Affiliated Hospital,Huzhou University,Huzhou 313000,China
  • Received:2020-11-08 Online:2021-07-28 Published:2021-07-22
  • Contact: Jikang MIN E-mail:2504074093@qq.com

摘要: 目的

探讨雌二醇联合1,25-二羟维生素D3[1,25(OH)2D3]对绝经后骨质疏松症(PMOP)大鼠的治疗作用,并阐明其作用机制。

方法

40只雌性SD大鼠随机分为对照组、骨质疏松症模型组(模型组)、卵巢去势后雌二醇干预组(雌二醇组)和卵巢去势后雌二醇联合1,25(OH)2D3组[雌二醇联合1,25(OH)2D3组],每组10只,连续喂养24周后取大鼠血清,采用酶联免疫吸附测定法(ELISA)检测各组大鼠血清中成骨标志物碱性磷酸酶(ALP)、骨钙素(OC)、骨保护素(OPG)、Ⅰ型前胶原氨基端原肽(PINP)、抗酒石酸酸性磷酸酶(TRACP)和骨吸收标志物核因子κB受体活化因子配体(RANKL)水平。取大鼠双侧股骨,采用HE和TRAP染色观察大鼠骨组织形态表现,采用骨密度仪和力学生物仪检测各组大鼠股骨骨密度(BMD)和骨组织弹性模量、刚度、最大应力及最大承受力。取大鼠双侧胫骨,采用逆转录PCR(RT-PCR)法和Western blotting法检测各组大鼠骨组织中ALP、OC、OPG及RANKL mRNA和蛋白表达水平。

结果

与对照组比较,模型组大鼠血清中ALP、OC、OPG、PINP、TRACP和RANKL水平明显升高(P<0.01);大鼠骨膜厚度明显增加,破骨细胞数量增多且骨外膜下可见少许点状虫蚀状缺损,呈现典型骨质疏松特点;大鼠股骨BMD和生物力学指标明显降低(P<0.01),骨组织中ALP、OC、OPG及RANKL mRNA和蛋白表达水平均明显升高(P<0.01)。与模型组比较,雌二醇联合1,25(OH)2D3组大鼠血清中ALP、PINP、TRACP和RANKL水平明显降低(P<0.01),OPG/RANKL比值明显升高(P<0.01);骨膜内成骨细胞增生活跃,且骨膜下无虫蚀状缺损;大鼠股骨BMD和生物力学指标明显升高(P<0.01),骨组织中ALP、OC及RANKL mRNA和蛋白表达水平明显降低(P<0.01)。与雌二醇组比较,雌二醇联合1,25(OH)2D3组大鼠血清中OC和OPG水平及OPG/RANKL比值明显升高(P<0.01),TRACP和RANKL水平明显降低(P<0.01),大鼠股骨BMD和生物力学指标中弹性模量及最大应力明显升高(P<0.01),骨组织中OPG mRNA和蛋白表达水平明显升高(P<0.01),RANKL mRNA和蛋白表达水平明显降低(P<0.01)。

结论

雌二醇联合1,25(OH)2D3能更有效地促进大鼠成骨细胞的增殖和分化,二者联合应用可在治疗PMOP的同时降低过量激素替代导致的不良反应发生率。

关键词: 绝经后骨质疏松症, 成骨细胞, 雌二醇, 1,25-二羟维生素D3, 骨密度

Abstract: Objective

To investigate the effect of estradiol combined with 1, 25-dihydroxyvitamin D3[1,25(OH)2D3] in the postmenopausal osteoporosis (PMOP) rats, and to clarify its mechanism.

Methods

Forty female SD rats were randomly divided into control group, osteoporosis model group (model group),ovarian castratiom and estradiol intervention group (estradiol group),ovarian castration and estradiol combined with 1, 25-(OH)2D3 group (estradiol combined with 1, 25 (OH)2D3 group);there were 10 rats in each group.The serum of rats were collected after 24 weeks of feeding, and the levels of alkaline phosphatase (ALP), osteocalcin (OC),osteoprotectin (OPG),amino-end peptide of type Ⅰ procollagen (PINP),tartrate-resistant acid phosphatase (TRACP) and nuclear factor kappa B receptor activator ligand (RANKL) were detected by ELISA method.Bilateral femurs were taken and the changes of bone tissue were observed by HE and TRAP staining. The elastic modulus, stiffness, maximum stress, maximum lord and bone mineral density (BMD) of bone tissue of the rats in each group were detected by biomechanics and BMD. The mRNA and protein expression levels of ALP, OC, OPG and RANKL in bone tissue of the rats in various groups were detected by RT-PCR and Western blotting methods.

Results

Compared with control group,the levels of serum ALP,OC,OPG,PINP,TRACP and RANKL were significantly increased(P<0.01),the periosteum thickness was increased,the number of osteoclasts was increased,and a little of punctate inset-etched defect was found under periosteum,presenting the typical features of osteoporosis; the biomechanical index and BDM of femurs were decreased(P<0.01),the expression levels of ALP,OC,OPG,and RANKL mRNA and proteins in bone tissue were significantly increased(P<0.01).Compared with model group,the levels of serum ALP,PINP,TRACP,and RANKL of the rats in estradiol combined with 1,25(OH)2D3 group were significantly decreased(P<0.01),the ratio of OPG/RANKL was increased(P<0.01),the osteoclasts in periosteum were proliferated actively,and there was no punctate inset-etched defect;the BMD of femurs of the rats and the biomechrical indexes were significantly increased(P<0.01),and the expression levels of ALP,OC and RANKL mRNA and proteins in bone tissue of the rats were decreased(P<0.01).Compared with estradiol group,the levels of serum OC and OPG of the rats in estradiol combined with 1,25(OH)2D3 group and the ratio of OPG/RANK were increased(P<0.01),the levels of TRACP and RNAKL were significantly decreased(P<0.01),the BMD of femurs and the biomechical indexes elastic modulus and maximum stress were significantly increased(P<0.01),the expression levels of OPG mRNA and protein in bone tissue were increased(P<0.01),and the expression levels of RANKL mRNA and protein were significantly decreased(P<0.01).

Conclusion

Estradiol combined with 1,25(OH)2D3 is more effective in promoting the proliferation and differentiation of osteoblasts, and the combination can reduce the adverse reactions caused by excessive hormone replacement while treating PMOP.

Key words: postmenopausal osteoporosis, osteoblast, estradiol, 1,25-dihydroxyvitamin D3, bone mineral density

中图分类号: 

  • R592