新的红细胞分化相关基因EDRF1增强HEL细胞的珠蛋白表达
A novel erythroid differentiation related gene EDRF1 upregulating globin gene expression in HEL cells
目的观察EDRF1基因在HEL细胞中对红细胞终末分化和珠蛋白表达的扮演的角色.方法构建EDRF1真核正义和反义表达载体,转染HEL细胞并筛选稳定表达细胞克隆.然后利用Northern blot和反转录PCR (reverse transcription-polymerase chain reaction, RT-PCR)的方法观察红系标志基因的表达水平改变.凝胶阻滞电泳(electrophoresis mobility shift assay, EMSA)的方法观察红系转录因子的DNA结合活性的改变.结果与对照相比,EDRF1过表达的HEL细胞中α-珠蛋白合成明显增加,EDRF1反义表达载体转染的HEL细胞中的α、γ-珠蛋白合成下调,而红细胞生成素受体(erythropoietin receptor, ER)表达水平没有明显改变,这提示EDRF1并非通过调控ER信号通路而影响HEL细胞的红细胞分化.红细胞特异的转录因子GATA-1和NF-E2 mRNA的表达在转染前后没有明显改变.另外,GATA-1转录因子的DNA结合活性在反义表达载体转染的HEL细胞中受到明显的抑制,而NF-E2的转录活性则没有明显的改变.结论 EDRF1下调珠蛋白的合成是通过抑制红系特异的转录因子GATA-1的DNA结合活性实现的.
更多Objective To further characterize the differentiation inducing properties of EDRF1 and demonstrate its functional pathway involved in regulation of globin gene expression. Methods By transfecting EDRF1 sense and antisense constructs into HEL cells, we identified the expression of globin and erythropoietin receptor genes by Northern blot analysis. RT-PCR and EMSA (electrophoresis mobility shift assay) were performed to monitor the expression and DNA-binding activity of erythroid specific transcription factors GATA-1 and NF-E2. Results It was shown that when EDRF1 was overexpressed, production of α-globin increased. In antisense EDRF1, overexpression of HEL cells, significant loss of α-, γ-globin mRNA synthesis was observed. The transcription of endogenous GATA-1 and NF-E2 mRNA expression were maintained at the same levels compared with control experiments. However, the transcription activity of GATA-1 was severely impaired. Expression of erythropoietin receptor gene was not influenced by EDRF1 gene overexpression. Conclusion The results suggested that EDRF1 regulated α- and γ-globin gene synthesis by modulating DNA-binding activity of GATA-1 transcription factor.
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