17β-雌二醇长时程作用促进成骨细胞HOS TE85 45Ca摄取及间质矿化

目的研究17β-雌二醇(17β-estradiol,E₂)对HOS TE85细胞骨形成的长时程效应。方法³H-胸腺嘧啶参入法(³H-TdR)测细胞增殖;⁴⁵Ca沉积法测细胞钙摄取;茜素红染色法测间质矿化。结果E₂(0.1～10 nmol·L^-1)作用14 d剂量依赖地刺激细胞³H-TdR参入、增加⁴⁵Ca摄取并增加茜素红染色面积。ICI182,780(1.0 nmol·L^-1)能部分抑制E₂作用,使其³H-TdR参入分别减少了36.56%,19.6%和15.4%,⁴⁵Ca的摄入则分别减少了22.27%,37.28%和40.1%,茜素红染色面积减少。结论E₂通过增加细胞数量、增加钙摄入而促进骨间质生成和矿化。

Long-term effects of 17 beta-estradiol in promoting 45Ca uptake and mineralized bone-like tissue formation in human osteoblast-like cell lines TE85]

AIM: To study the long-term effects of 17 beta-estradiol (E2) on cell proliferation, 45Ca up-take, and mineralized bone-like tissue formation in human osteoblast-like cell line TE85. METHODS: Human osteoblast-like cell line TE85 was used as osteoblast cell model. Using methods of 3H-thymidine incorporation for cell proliferation and 45Ca deposit for calcium uptake, and Alizarin red S dye for mineralized bone-like tissue. RESULTS: Compared with the cells of control group, 3H-thymidine incorporation into TE85 cells was significantly increased (85.65%, 93.42% and 106.58%, respectively) and 45Ca uptake was increased (101.35%, 130.9% and 169.5% respectively), after treated with E2 (0.1, 1.0, 10 nmol.L-1) for 14 days. The stained area of Alizarin red S in E2 treated cells was also increased obviously. ICI182,780, a specific antagonist of estrogen receptor, was shown to partly inhibit E2 induced actions with the inhibition ratio of 19.6% or 37.28% in both experiments of 3H-TdR and 45Ca uptake on the condition of E2 (1.0 nmol.L-1). CONCLUSION: E2 was found to increase the mineralized bone-like tissue by enhancement of cell proliferation and promotion of calcium uptake, which were in favor of bone formation. These actions may be partly mediated by estrogen receptor.