摘要
多环芳烃(polycyclic aromatic hydrocarbons,PAHs)是广泛存在于水、沉积物、土壤、植物和空气环境中的污染物,主要来源于工业废气、汽车尾气、油烟、吸烟、熏制食品等。PAHs是极其稳定的,所以造成环境的持续污染。苯并芘(Benzo[a]pyrene,BaP)是典型的强致癌性的多环芳烃类化合物,对其已有许多深入的研究报道。BaP通过机体代谢产生的BPDE(benzo[a]pyrene-7,8-diol-9,10-epoxide)是目前已知的最强的致癌物之一。BaP可阻断细胞生长分化调节的信号转导,与DNA形成加合物,导致DNA的断裂,诱导p53基因突变等等。但是就BaP可否诱导细胞产生DNA双链断裂(double strandbreaks,DSBs)的标记γH2AX(磷酸化的组蛋白H2AX),报道不一。而且关于BaP诱导γH2AX产生的周期依赖性及参与形成γH2AX的激酶的研究也未见报道。
此外,以往的研究结果仅在单方面揭示BaP可能的遗传毒性或致癌的机理。然而BaP诱导的遗传毒性与细胞应答,可能的致癌机理并不是由单一或几个基因造成的,癌变是多因素、多阶段的过程。单纯针对某一个基因开展工作,很难发现与癌症相关明确的机理。以基因组学和蛋白质组学为主的高通量扫描技术的出现为此研究提供了一种新的研究思路。通过分析一个生物过程中基因组或蛋白组的变化,可以全面地了解参与生物过程的相关基因,构建细胞应答网络,解析关键细胞信号转导通路,从而更深入地探讨其潜在的分子机制。应用此类技术,已对BaP所诱导的细胞应激反应进行了分析,并鉴定了一批应答基因和蛋白。但是作为一种主要以DNA为靶点的化合物,BaP诱导的DNA损伤,势必引起DNA修复应答,从而影响正常的基因表达,造成细胞内蛋白表达差异。因为参与DNA损伤应答的蛋白理论上都应在细胞核内,所以研究BaP对细胞核蛋白表达的影响可能会对理解其遗传毒性及癌变的机制提供更有效的信息。
鉴于以上原因,本研究首先系统地探讨了BaP处理细胞后对细胞生存率和细胞周期的影响,及其造成的DNA损伤是否可诱导γH2AX的产生。本论文的第一部分中,通过应用HeLa细胞我们首先验证BaP是否可诱导H2AX的磷酸化。采用MTT法,检测BaP对HeLa细胞生存率的影响;流式细胞技术分析了BaP对细胞周期的影响。采用了免疫荧光染色及Western-blot方法,研究了BaP诱导γH2AX的时间及浓度效应及γH2AX产生与细胞周期的关系。在此基础上,进一步使用基因缺失的细胞系及激酶抑制剂,研究了参与BaP诱H2AX磷酸化的激酶。
通过以上的研究发现,BaP只有在较高剂量和长时间处理情况下对细胞活力有影响;对细胞周期影响较明显,可使细胞滞留于S期。BaP在HeLa细胞中诱导γH2AX的产生,并具有显著的时间及浓度效应,且具有S期或G2/M期的依赖性。通过不同基因缺失细胞的研究发现,BaP同样也可诱导γH2AX的产生,而且PIKKs(phosphatidylinositol 3-kinase-like protein kinases)家族的主要成员,包括ATM(ataxia telangiectasia mutated kinase)、ATR(ATM and Rad3-related kinase)和DNA-PK(DNA-dependent protein kinase),在功能上互补或重叠参与了这一过程。
本论文的第二部分主要应用蛋白组学的方法系统分析了BaP对HeLa细胞核蛋白表达的影响。研究中我们使用10μmol.L~(-1)的BaP处理HeLa细胞6 h、12 h、24 h后,提取核蛋白,进行Bradford定量。样本进行双向电泳分析,使用GS-800扫描仪获取图像。运用PDQuest 7.1软件分析数字化图像文件,发现差异表达的蛋白点;胶内酶解后使用液相色谱-串联质谱(LC-MS/MS)分析差异点。
结果发现,与对照组相比,BaP处理引起128个蛋白点表达发生了显著性的改变,对其中易切取的差异点进行了质谱分析,最终鉴定了24种理论上符合的蛋白。进一步对其中鉴定的Lamin A和Bub3蛋白进行了Western-blot,共聚焦显微镜(Confocal microscopy)验证,结果与双向电泳结果一致。在鉴定的蛋白中,发现了数种与RNA剪接相关的蛋白,提示BaP处理可能诱导变异剪接的产生。因此,进一步以Fas与CD44为靶基因,采用RT-PCR方法,检测其变异剪接体的变化,发现BaP引起Fas可溶性受体变异剪接体的表达改变。
以上研究为进一步了解BaP的遗传毒性及致癌机理提供了有益的信息,其中发现的DNA损伤应激反应中变异剪接现象值得更深入的研究。
Polycyclic aromatic hydrocarbons (PAHs) are wide-spread environmentalpollutants which have been detected in surface waters, sediments, soil, plants, and bothrural and urban air. Automobile exhaust, domestic wood burning and industrial wastebyproducts are all sources of PAHs. Without an external stimulus, PAHs are extremelystable, making them a persistent environmental problem. Benzo[a]pyrene (BaP) is arepresentative of carcinogenic PAHs, and has been under intensive studies. BaP ismetabolized into BPDE, one of the strongest carcinogens. BaP can block signaltransductions、cell growth and differentiation, form adducts with DNA, induce DNAbreaks, as well as cause mutation in p53 gene. However, there were conflicting reportsabout the ability of BaP to induceγH2AX (the phospohorylated form of histoneH2AX), a marker for DNA double strand breaks (DSBs). In addition, it is not clearBaP-inducedγH2AX is cell cycle dependent, and the kinases involved inγH2AXformation are not known.
In addition, previous studies usually only address one aspect of the possiblemechanisms for the carcinogenicity of BaP. However, it is clear that cancer is not theresult of a single or several genes, and carcinogenesis is a multi-factor, multi-stageprocess. Focusing on only a single gene is very difficult to elucidate the mechanismsfor cancer. The advent of high-throughput technologies, such as genomics andproteomics, provides a new angle for cancer study. By globally analyzing the changes of genes and proteins in a biological process, those involved can be identified,cellular response network can be constructed, key signal transduction pathway can beanalyzed, all of which could help understand the underlying molecular mechanism.Using such techniques, the cellular response to BaP treatment has been analyzed, and agroup of responsive genes/proteins has been identified. Nonetheless, as the maintarget for BaP is DNA, BaP-induced DNA damage would lead to DNA repair response,thus changes in gene expression, and eventually result in changes in protein expression.Since most of the DNA damage responsive proteins should reside in the nucleus, tostudy the effects of BaP on nuclear protein expression would provide betterinformation for the understanding of BaP-induced carcinogenesis.
Therefore, in this study, we first investigated the effects of BaP treatment on cellsurvival and cell cycle, and whether BaP-induced DNA damage can lead to thephosphorylation of H2AX. In the first part of this dissertation, by using HeLa cells,we examined the ability of BaP to induce H2AX phosphorylation. The effects of BaPon HeLa cell survival was measured by MTT assay; cell cycle was analyzed by flowcytometry. The time- and dose-response of BaP to induceγH2AX, as well as thecorrelation betweenγH2AX and cell cycle was evaluated by Western-blot andimmunofluorescent microscopy. Furthermore, using specific gene-deficient cells andkinase inhibitors, we analyzed the kinases involved in BaP-induced H2AXphosphorylation.
Our results showed that only at higher concentrations or longer incubation timesdid BaP affect cell survival. In contrast, BaP significantly affected cell cycle, causingarrest in the S and G2/M phase. BaP inducedγH2AX in a time- and dose-dependentmanner in HeLa cells, which also showed a cell cycle-dependent manner. BaP alsoinducedγH2AX in the different gene-deficient cell lines, and members of the PIKKsfamily, including ATM, ATR, and DNA-PK were involved in this process.
In the second part of this dissertation, we used proteomic method analyzed the effects of BaP on nuclear protein expression in HeLa cells. HeLa cells were treatedwith 10μmol.L~(-1) BaP for 6, 12, and 24 h. Nuclear protein was then extracted andprotein concentration was determined by Bradford method. After 2-dimensionalelectrophoresis, gel images were captured using a GS-800 scanner and analyzed byPDQuest 7.1 for differentially expressed protein spots. After in-gel digestion, proteinswere identified by liquid chromatography-tandem mass spectrometry.
It was found that compared to control, BaP treatment induced expression changesin over 128 proteins, and 24 were successfully identified by mass spectrometry. Twoof them, Lamin A and Bub 3, were further examined by Western blot and Confocalmicroscopy, and thus validated the 2-dimensional electrophoresis results. Among theidentified proteins, several are involved in alternative splicing, suggesting that BaPtreatment could induce alternative splicing. Therefore, we further examined changesin the splicing variants of two genes, Fas and CD44, using RT-PCR, and the resultsshowed that indeed BaP caused changes in the soluble splicing variant of Fas.
Taken together, results obtained from above study provided useful information forthe better understanding of the mechanisms for BaP-induced carcinogenesis, and thephenomenon of alternative splicing during DNA damage response is worth furtherstudy.
引文
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