表皮生长因子、碱性成纤维细胞生长因子对人视网膜色素上皮细胞DNA合成的影响

目的探索表皮生长因子（ｅｐｉｄｅｒｍａｌｇｒｏｗｔｈｆａｃｔｏｒ，ＥＧＦ）、碱性成纤维细胞生长因子（ｂａｓｉｃｆｉｂｒｏｂｌａｓｔｇｒｏｗｔｈｆａｃｔｏｒ，ｂＦＧＦ）对培养的人视网膜色素上皮（ｒｅｔｉｎａｌｐｉｇｍｅｎｔｅｐｉｔｈｅｌｉｕｍ，ＲＰＥ）细胞促进ＤＮＡ合成的最佳刺激浓度，并对两种因子的协同作用进行探讨。方法培养的人ＲＰＥ细胞第６代用于本实验。应用氚标胸腺嘧啶核苷（３Ｈ－ｔｈｙｍｉｄｉｎｅ，３Ｈ－ＴｄＲ）掺入试验及放射自显影检测ＥＧＦ、ｂＦＧＦ对ＲＰＥ细胞的促ＤＮＡ合成作用。结果ＥＧＦ、ｂＦＧＦ均可引起剂量依赖的促有丝分裂作用。在含２％血清的培养液中，ＥＧＦ、ｂＦＧＦ作用最佳浓度为１ｎｇ／ｍｌ，明显低于无血清培养液中ＥＧＦ、ｂＦＧＦ作用的最佳浓度（１０ｎｇ／ｍｌ）。联合应用１０ｎｇ／ｍｌＥＧＦ、１０ｎｇ／ｍｌｂＦＧＦ约提高ＲＰＥ细胞合成ＤＮＡ能力２．９６倍。结论ＥＧＦ、ｂＦＧＦ对培养的人ＲＰＥ细胞具有促进ＤＮＡ合成作用，且两者可产生协同效应。

EGF and bFGF effects on DNA synthesis in human retinal pigment epithelial cells

Purpose To investigate the optimal concentrations of epidermal growth factor(EGF)and basic fibroblast growth factor(bFGF)on DNA synthesis and their synergism in density arrested human retinal pigment epithelial(RPE)cells. Methods Growth factor effects in cultured human RPE of the 6th generation were assessed by thymidine incorporation and radioautography. Results EGF and bFGF were potent stimulators when used alone,and their optimal concentrations were 10ng/ml in DMEM and 1ng/ml in 2%serum DMEM.When used in combination(10ng/ml EGF and 10ng/ml bFGF),they caused a significant enhancement of thymidine incorporation about 2.96 times. Conclusion EGF and bFGF were potent stimulators in RPE cells,and demonstrated synergism in their action.