氟对小鼠成纤维细胞和成骨细胞c-fos表达的影响

目的 观察氟对小鼠成纤维细胞(FB)和成骨细胞(OB)c-fos mRNA和蛋白表达的影响,探讨c-fos表达改变在FB成骨功能方面的作用.方法 将小鼠FB和OB分为对照组和6个染氟组,染氟(F-)质量浓度分别为0、0.0001、0.0010、0.1000、1.0000、10.0000、20.0000 mg/L,培养时间为2、4、24、48、72 h.应用酶联免疫吸附法(ELISA)和RT-PCR法分别检测各时间段培养细胞上清液c-fos蛋白和染氟48 h细胞中c-fos mRNA的表达.结果 ELISA结果表明,各染氟组FB在各时间段c-fos蛋白水平均较相应对照组明显升高(P<0.01);OB c-fos蛋白水平在氟作用48 h的0.0001、0.0010 mg/L组(0.73±0.04、0.64±0.14)、氟作用72 h的0.0001mg/L组(0.70±0.17)较对照组(0.32±0.04、0.27±0.05)明显升高(P<0.01).RT-PCR结果表明,染氟48 h各剂量组FB c-fos mRNA表达(1.06±0.16、1.06±0.12、1.12±0.16、1.04±0.15、1.04±0.10、1.15±0.29)呈上升趋势,但与对照组(0.95±0.11)比较,差异无统计学意义(P>0.05);OB在染氟20.0000 mg/L组c-fos mRNA表达(1.40±0.17)较对照组(1.06±0.06)明显升高(P<0.01).结论 氟对FB和OB c-fos mRNA和蛋白表达具有明显的刺激增强作用,可能在促进FB成骨表型表达和成骨活动增强方面发挥重要作用.

Effects of fluoride on the expression of c-fos in mouse fibroblast and osteoblast

Objective To observe the expression of c-fos mRNA and protein in fluoride treated mouse fibroblast (FB) and osteoblast (OB) and to further explore the effects of c-fos in the osteogenic action of FB. Methods Mouse FB and OB were divided into control group and six fluoride groups (0, 0.0001, 0.0010, 0.1000, 1.0000, 10.0000,20.0000 mg/L F-), and the levels of c-fos protein at 2,4,24,48,72 h and c-fos mRNA at 48 h were measured by using ELISA and RT-PCR methods. Results Compared with the control group, fluoride increased the content of c-fos protein obviously in all FB group(P<0.01); and it is increased in 0.0001,0.0010 mg/L groups at 48 h (0.73±0.04, 0.64±0.14) and 0.0001 mg/L group at 72 h(0.70±0.17) in OB compared with the control group (0.32±0.04,0.27±0.05, P<0.01). Compared with the control group (0.95±0.11), RT-PCR revealed an increasing tendency of the expression of c-fos mRNA at 48 h in FB (1.06±0.16, 1.06±0.12,1.12±0.16,1.04±0.15,1.04±0.10,1.15±0.29), but the difference was not statistically significant(P>0.05); however, a statistically significant difference(P<0.01) of c-fos mRNA in 20.0000 mg/L group(1.40±0.17) in O B was found compared with the control group (1.06±0.06). Conclusion The higher expression of c-fos mRNA and protein in FB induced by fluoride may play an important role in the transformation of osteoblastic phenotype as well as increase the osteogenesis ability in FB.