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B细胞易位基因2(B-cell translocation gene 2,BTG2)是细胞增殖抑制蛋白TOB/BTG家族的成员之一,在细胞分化、发育、凋亡等细胞生物学功能的调节中发挥着重要的作用[1]。包括苏州大学医学部放射医学与防护学院肿瘤放射生物学实验室在内的国内外多项研究发现,BTG2的表达水平改变也会影响到肿瘤细胞的生长、凋亡、转移和放射敏感性[2-10]。在癌症患者的治疗过程中,约70%的患者需要接受放射治疗,放射治疗是恶性肿瘤患者不可缺少的重要治疗手段。肿瘤的放射治疗效果与肿瘤的敏感性有着密切的关系。本研究旨在了解电离辐射对肿瘤细胞中BTG2的表达水平以及蛋白稳定性的影响,从而确定BTG2作为一种新的辐射损伤诱导基因,为其作为一种临床肿瘤放射治疗疗效预测和预后评价新指标提供实验基础和理论依据。
BTG2作为一种新的电离辐射诱导基因的研究
Study on B-cell translocation gene 2 as a novel radiation-induced gene
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摘要:
目的 研究γ射线照射对肿瘤细胞的B细胞易位基因2(BTG2)表达水平的影响。 方法 应用RT-PCR方法研究电离辐射对肿瘤细胞BTG2 mRNA水平的影响;应用Western blot方法测定电离辐射对肿瘤细胞BTG2蛋白表达水平的影响。 结果 与未照射对照细胞相比,3 Gy γ射线单次剂量照射明显提高了人乳腺癌细胞系MCF-7、MDA-MB-231和人宫颈癌细胞系C33A、HeLa中的BTG2蛋白的表达水平。γ射线照射人乳腺癌细胞系MCF-7和MDA-MB-231导致了照射剂量和时间依赖性的BTG2表达水平的升高,而且这种改变既表现在BTG2 mRNA水平上,也反映在BTG2蛋白水平上。 结论 BTG2是一种新的辐射诱导DNA损伤的反应基因,进一步研究将为BTG2作为肿瘤放射治疗的疗效和预后评价指标提供实验基础和依据。 Abstract:Objective To investigate the effects of ionizing radiation on the expression of B-cell translocation gene 2(BTG2) in cancer cells. Methods RT-PCR was used to determine the level of BTG2 mRNA, while the expression of BTG2 protein was assayed by Western blot. Results Compared with the un-irradiated cells, a single dose of 3 Gy γ-rays caused a significant increase of BTG2 protein in breast cancer cell lines, MCF-7 and MDA-MB-231, and cervical cancer cell lines, C33A and HeLa. Furthermore, irradiation with γ-rays resulted in a dose and time dependent increase of BTG2 at both mRNA and protein levels. Conclusion The present study demonstrates, for the first time, that BTG2 is a value response gene to exposure of ionizing radiation, which may provide evidence for BTG2 as a novel marker for radiotherapy of cancer. -
Key words:
- Cancer /
- Radiation, ionizing /
- B-cell translocation gene 2
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