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DNA损伤应答:杂种细胞染色体不稳定及miR-214调控RNF8的研究
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摘要
在大量的种间杂种细胞中,来自一个物种的染色体易发生丢失,而另一个物种的染色体则通常保持完整;例如,在人和小鼠的杂种细胞中,大量的人源染色体会被丢失。关于单一物种染色体丢失的机制目前仍知之甚少。在人工诱导或者有性杂交形成的杂种细胞研究中,对于染色体的丢失,前人曾提出一些假设,如物种间染色体分离不同步、核蛋白复制不同步及染色体空间隔离等;然而这些假设均源于对少量的固定细胞观察所得。活细胞实时摄影技术可追踪观察染色体在细胞周期进程中的行为,可准确确定染色体丢失的途径。本研究利用活细胞实时摄影和荧光原位杂交等技术,发现人鼠杂种细胞中人源染色体的丢失是渐进性的,以染色体断片的形式丢失。这种丢失与人源染色体上存在未修复的DNA损伤而细胞持续分裂有关。人源染色体上未修复的DNA损伤,可能是由于细胞发生融合后DNA损伤修复机制发生改变所致。此外,通过辐照增加人源染色体上的DNA损伤会加速杂种细胞中人源染色体的丢失,进一步表明,在人鼠杂种细胞中,人源染色体的丢失是因为人源染色体存在未修复的DNA损伤所致。综上,通过研究人鼠杂种细胞中染色体不稳定性,发现了一条新的引起染色体不稳定性的机制;该研究可为了解肿瘤发生提供参考。另外,本研究也提示:杂种细胞可作为深入研究DNA损伤应答分子机制的细胞模型。
     在多类肿瘤中,肿瘤的发生与DNA损伤应答的异常密切相关。DNA损伤应答信号通路包括感应DNA损伤、信号传递和促进DNA损伤修复等,其缺陷将导致肿瘤中普遍的特征之一染色体不稳定的发生。然而,目前对于这条信号通路仍不甚了解。泛素化连接酶RNF8介导着H2AX的泛素化,从而促进53BP1和BRCA1被募集到DNA损伤部位,进而促进DNA损伤修复,防止染色体不稳定。虽然RNF8是DNA损伤应答通路中的关键蛋白,但是对其表达的调控目前尚不清楚。本研究发现,在人卵巢癌细胞株中,miR-214可以通过结合3’UTR来抑制RNF8的表达,从而对DNA损伤应答造成干扰。同时,抑制miR-214的功能则可增加RNF8的表达,增强细胞的DNA损伤修复能力。另外,高表达不带有3’UTR的RNF8可以拯救miR-214过表达的效应。综上,这些结果表明,miR-214介导的RNF8的下调将干扰对DNA损伤的应答,进而导致卵巢癌染色体不稳定;该研究将有助于认识染色体不稳定性发生机制。
In many interspecific hybrid cells, the chromosomes from one parental set preferentially lose, while those from the other parent are retained. In human-mouse hybrid cells, the extensive chromosomal elimination of human genome often occurs. Several hypotheses were proposed to explain the mechanisms underlying the elimination of uniparental chromosomes in the interspecific hybrid cells formed by sexual hybridization or artificial cell fusion, such as asynchronous chromosome segregation, asynchronous nucleoprotein synthesis or spatial separation of parental genomes, etc. However, these hypotheses were derived from the observations on small numbers of fixed cells, and the underlying mechanisms are still elusive. Live cell imaging can be used to observe the dynamics of chromosomes during progression of cell cycle, to determine the way of chromosome loss. Here, we for the first time found that the elimination of human chromosomes is progressive through the loss of fragmented chromosomes. The results showed that the elimination of human chromosomes in human-mouse hybrid cells is accompanied by continued cell division at the presence of DNA damage on human chromosomes. Deficiency in DNA damage repair on human chromosomes occurs after cell fusion. Furthermore, increasing the level of DNA damage on human chromosomes by irradiation accelerates human chromosome loss in hybrid cells. Our results indicate that the elimination of human chromosomes in human-mouse hybrid cells results from unrepaired DNA damage on human chromosomes. Altogether, we study CIN in human-mouse hybrid cells formed by cell fusion and provide direct evidence for a novel mechanism underlying CIN, which may facilitate the understanding of carcinogenesis. Furthermore, our results show that human-mouse hybrid cells may be as a good model to facilitate the research on the mechanisms of DNA damage response.
     A defective DNA damage response in tumours is frequently associated with carcinogenesis. The DNA damage response includes sensing DNA lesions, signal transduction and promoting damage repair. Abrogation of this response can cause chromosome instability, which is a common characteristic of most tumours. However, the underlying molecular mechanisms on the regulation of this network are still elusive. The ubiquitin ligase RNF8mediates the ubiquitination of H2AX to recruit53BP1and BRCAl at DNA damage sites, further promoting DNA damage response and inhibiting chromosomal instability. Though RNF8is a key protein involved in the DNA damage response, regulation of its expression is poorly understood. Here, we show that miR-214represses RNF8expression in ovarian cancer cell lines, by binding to its3'-untranslated region and so impairs the DNA damage response, while antagonizing miR-214increases RNF8expression and thus improves the level of DNA damage repair. Consistent with the role of miR-214in regulating RNF8level, the impaired DNA repair induced by miR-214over-expression can be rescued by over-expressing RNF8without3'-untranslated region. Together, these results suggest that miR-214-mediated down-regulation of RNF8impedes DNA damage response to induce chromosome instability in ovarian cancers, which may facilitates the understanding of mechanisms of chromosome instability.
引文
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