| 孙世龙,董娟聪,金顺子.miR-503对辐射诱导U937细胞CD40表达的调控作用[J].中华放射医学与防护杂志,2011,31(6):636-639 |
| miR-503对辐射诱导U937细胞CD40表达的调控作用 |
| Regulation of miR-503 on the expression of CD40 induced by irradiation in U937 cells |
| 投稿时间：2011-04-23 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.06.004 |
| 中文关键词: miR-503 CD40 电离辐射 肿瘤 调控 |
| 英文关键词:miR-503 CD40 Irradiation Tumor Regulation |
| 基金项目:国家自然科学基金面上项目(30870584);国家教育部留学回国人员启动基金项目(20101201) |
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| 中文摘要: |
| 目的 探讨miR-503在U937细胞中与CD40的靶向关系,并观察其对辐射诱导U937细胞CD40表达的调控作用。方法 将miR-503序列插入载体pcDNA-DEST-47中构建真核表达质粒;同时构建CD40基因3’-UTR-荧光素酶报告质粒,与pcDNA-DEST-miR-503质粒共转染至U937细胞,分析miR-503对其调控作用;同时用miR-203和miR-29b作为对照,观察miR-503对CD40的靶向作用。采用Western blot方法,证实miR-503对CD40蛋白表达的抑制作用及照射后U937细胞CD40蛋白表达变化;采用Real-Time PCR方法检测 5 Gy电离辐射照射后U937细胞miR-503表达量。结果 psiCHECK2-CD40和pcDNA-DEST-miR-503两种质粒共转染组的荧光素酶表达明显低于单独转染的空载体和靶基因CD40组(t=3.16,P<0.05),miR-203和miR-29b不能抑制CD40荧光素酶活性,而miR-503明显抑制CD40荧光素酶活性(t=5.25,P<0.01);转染pcDNA-DEST-miR-503质粒后在U937细胞中,靶基因CD40蛋白的表达受抑制。5 Gy电离辐射照射后,U937细胞中miR-503表达量上调(t=3.63~17.00,P<0.01),而CD40蛋白表达下降。结论 miR-503与CD40可能是靶向关系,并参与其调控作用。辐射上调人急性白血病细胞株U937细胞的miR-503的表达量,而且抑制CD40蛋白表达,说明miR-503可能参与辐射对肿瘤细胞CD40蛋白表达的调控作用。 |
| 英文摘要: |
| Objective To study whether or not CD40 gene is a target of miR-503 in U937 cells, and to observe the regulatory effects of miR-503 on expression of CD40 induced by irradiation in U937cells. Methods The miR-503 sequence was inserted into pcDNA-DEST-47 plasmid to construct the eukaryotic expression vector (pcDNA-DEST-miR-503) and to construct the CD40 gene 3'-UTR luciferase reporter plasmid (psiCHECK2-CD40) at the same time. They were used to transfect U937 cells together for analysis of the regulatory effects of miR-503 on the expression of CD40. Meanwhile the miR-203 and miR-29b were used as controls to observe whether or not CD40 gene was a target of miR-503. The expression change of CD40 after irradiation, and the inhibitory effect of miR-503 on the expression of CD40 was confirmed by Western blot assay. The expression of miR-503 was detected by real-time RT-PCR (qPCR) after irradiation with doses of 5.0 Gy. Results The expression of luciferase in the group of transfected with pcDNA-DEST-miR-503 and psiCHECK2-CD40 plasmids was significantly lower than that in the group transfected with empty plasmid and CD40 gene (t=3.16, P<0.05). And the miR-203 and miR-29b could not inhibit the activity of CD40 luciferase, but the miR-503 could significantly inhibit the activity of it (t=5.25, P<0.01). The expression of CD40 protein in U937 cells was decreased after the cells were transfected with pcDNA-DEST-miR-503. After irradiation with dose of 5.0 Gy, the expression of miR-503 were increased (t=3.63-17.00, P<0.01) and the expression of CD40 protein decreased. Conclusions The CD40 gene might be the target of miR-503, and miR-503 could regulate the expression of CD40 gene.Irradiation could up-regulate the expression of miR-503 and inhibit the expression of CD40 protein in U937 cells. miR-503 might play a role in the process of regulation of irradiation on expression of CD40 protein in tumor cells. |
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