马淑梅,吴丽珉,刘扬,等.P53在电离辐射诱导的细胞周期解耦联中的作用[J].中华放射医学与防护杂志,2008,28(6):597-600.MA Shu-mei,WU Li-min,LIU Yang,et al.Roles of p53 in ionizing radiation-induced cell cycle uncoupling[J].Chin J Radiol Med Prot,2008,28(6):597-600 |
P53在电离辐射诱导的细胞周期解耦联中的作用 |
Roles of p53 in ionizing radiation-induced cell cycle uncoupling |
投稿时间:2007-11-15 |
DOI: |
中文关键词: p53基因 细胞周期解耦联 RNA干扰 电离辐射 |
英文关键词:p53 gene Cell cycle uncoupling RNAi Ionizing radiation |
基金项目:国家自然科学基金资助项目(30500142、30770649);吉林省科技发展计划资助项目(2005136);教育部留学回国人员科研启动资助项目(2005) |
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中文摘要: |
目的 探讨p53基因在电离辐射(IR)诱导的MCF-7细胞周期解耦联中的作用。 方法 构建RNAi表达载体,经磷酸钙共沉淀法转染293T细胞形成病毒包装颗粒,感染MCF-7后采用Western blot检测P53蛋白的表达,建立p53基因沉默模型。将p53野生型(+ +)和沉默模型(- -)经电离辐射处理后,采用流式细胞术分别测定细胞周期并分析细胞多倍体的变化。结果 与p53+ +组比较,p53- -模型组G0 G1期细胞百分数减少,S期、G2期增加(P<0.01),倍体分析表明二倍体数减少,四倍体、八倍体均增加(P<0.01)。在p53+ +和p53- -细胞中,与假照射组比较,4 Gy照射后G0 G1期、S期细胞百分数减少,而G2期增多(P<0.01);倍体分析表明,照射后二倍体数减少,四倍体、八倍体均增加(P<0.01)。与p53+ ++IR组比较,p53- -+IR 组发生G0 G1期、S期细胞百分数减少,G2+M期增多(P<0.01),二倍体数减少,四倍体增多(P<0.01),八倍体无明显差别。结论 电离辐射可以诱导细胞发生G2期阻滞和细胞周期解耦联;P53在电离辐射诱导的MCF-7细胞G2期阻滞中发挥作用,而在细胞周期解耦联中可能不发挥作用。 |
英文摘要: |
Objective To explore the roles of p53 in ionizing radiation induced MCF-7 cell cycle uncoupling.Methods The p53 knock-down models was established in MCF-7 with retrovirus packaged particles from 293T cells through calcium acid phosphate co-precipitation, then Western blot was used to detect the protein expression. Flow cytometry(FCM) was used to analyze the cell cycle uncoupling and polyploid after irradiation.Results Compared with p53+ + group, the percentages of G0 G1 cells in p53- - group decreased, while those of S and G2+M increased (P<0.01). In polyploidy analysis 2N cells decreased, whereas both 4N and 8N cells increased (P<0.01). Compared with sham-irradiation, 4 Gy X-ray led to the decrease of G0 G1, S cells, and the increase of G2+M cells. The increase of 2N cells and decrease of 4N and 8N cells were observed in both p53+ + and p53- - cells. Compared with p53+ ++IR group, the decrease of G0 G1 and S cells and the increase of G2+M cells were significant (P<0.01) in p53- -+IR groups. 2N cells decreased, 4N cells increased, but no changes in 8 N cells occurred. Conclusion Radiation might induce G2 arrest and cycle uncoupling. p53 plays a role in the regulation of G2 arrest, but no role in cycle uncoupling. |
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