辐射对体外培养MC3T3-E1成骨前体细胞增殖和分化的影响  

Effects of irradiation on proliferation and differentiation of MC3T3-E1 osteoblastic cells in vitro

作　　者：李玉梅[1] 赵铱民 查年保 舒震[3] 张松[4] 

机构地区：[1]襄阳市中心医院口腔科,襄阳441021 [2]第四军医大学口腔医院修复科 [3]第四军医大学药学系生物技术中心,西安710032 [4]第四军医大学唐都医院药剂科,西安710038

出　　处：《华西口腔医学杂志》2014年第4期341-344,共4页West China Journal of Stomatology

摘　　要：目的观察60Coγ射线对MC3T3-E1成骨前体细胞增殖和分化能力的影响。方法 MC3T3-E1细胞接种24 h后进行60Coγ射线照射,单次照射剂量分别为0、4、8 Gy。辐射后第1、3、5、7天,采用噻唑蓝比色法检测细胞的增殖能力;辐射后第12天,用黏胶纤维红染色法检测细胞的胶原分泌情况;第16天,用实时荧光定量聚合酶链反应检测细胞成骨相关基因mRNA的表达;第28天,采用茜素红染色及定量分析检测细胞基质的矿化能力。结果与对照组(0 Gy)相比,4、8 Gy剂量的射线可以明显降低MC3T3-E1细胞的增殖,并下调其Osterix和骨钙素基因的表达;8 Gy剂量的射线可以明显抑制细胞的胶原分泌和基质矿化能力。结论 60Coγ射线可以降低MC3T3-E1细胞的增殖、胶原分泌及基质矿化能力,并下调其成骨相关基因表达,且随辐射剂量增加,其作用增强。Objective The aim of this study is to investigate the effects of irradiation on the proliferation and differentiation of MC3T3-E1 osteoblastic cells. Methods MC3T3-E1 cells were irradiated 24 h after initial seeding. Gamma-radiation was administered at 0, 4, and 8 Gy as single doses by using a 60Co source. Cell proliferation was assessed at days 1, 3, 5, and 7 post-irradiation by using 3-（4,5-dimethylthiazol-2-yl）-2,5-diphenylte-trazolium bromide assay. The collagen secretion of the cells was measured through sirius red staining at day 12 post-irradiation. The expressions of osteogenesis-related genes were assessed through real time fluorescence quantitative polymerase chain reaction at day 16 post-irradiation. The matrix mineralization caused by cells was evaluated through alizarin red staining at day 28 post-irradiation. Results The cells exposed to 4 Gy or 8 Gy demonstrated significantly lower proliferation rates compared with the non-irradiated group. Doses of 4 Gy or more significantly inhibited the expressions of osteogenesis-related genes （Osterix and osteocalcin）. Collagen secretion and cell mineralization were significantly reduced by the 8 Gy dose. Conclusion 60Co γ-rays dose-dependently suppress the proliferation, collagen secretion, and mineralization of MC3T3-E1 cells. Furthermore, radiation seems to dose-dependently inhibit the expressions of osteogenesis-related genes of the cells.

关 键 词：成骨细胞 Γ辐射 细胞分化 基因表达 

分 类 号：R730.55[医药卫生—肿瘤]