口腔黏膜下纤维性变癌变的危险因素及以Survivin为靶向的致病机制研究
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摘要
背景与目的
     口腔黏膜下纤维性变(oral submucous fibrosis,OSF)是一种具有癌变倾向的口腔黏膜疾病。印度、孟加拉国、巴基斯坦等南亚、东南亚地区及我国湖南、台湾、海南等地为OSF高发区,这与当地居民喜好咀嚼槟榔有关。OSF的癌变率可高达7~13%,且近年来有逐渐上升的趋势。OSF癌变是多因素综合作用的结果,其发病机制目前尚无明确定论。鉴于此,有必要对OSF癌变发病机制作进一步研究。
     我们首先从流行病学的角度,采用Logistic回归分析探讨OSF癌变的危险因素,为预防和治疗提供依据。接着,选择Survivin及其相关分子为代表,从分子生物学的角度,以细胞凋亡受阻、细胞周期紊乱为切入点来探讨OSF癌变的发病机制,为早期诊断与治疗提供理论依据。
     方法
     首先,对病例组42例OSF癌变患者和对照组40例OSF未癌变者进行多因素Logistic回归分析,研究OSF癌变与年龄等13个相关因素之间的数量关系。接着,在10例正常口腔黏膜上皮组织、40例OSF上皮组织(早期10例、中期15例、晚期15例)以及42例OSF癌变组织中,采用免疫组化、RT-PCR及Western blotting先分别检测Survivin的表达,再应用免疫组化及Western blotting检测p-Survivin的表达,然后应用Western blotting分别检测Cyclin B1、p34~(cdc2)和p-p34~(cdc2)的表达。最后,利用免疫共沉淀分析p34~(cdc2)激酶与Survivin的相关性。
     结果
     1.Logistic回归结果提示,引入回归方程的4个因素为:年龄、嚼槟榔持续时间、吸烟持续时间、是否合并白斑(oral leukoplakia,OLK)或扁平苔藓(oral lichen planus,OLP)。
     2.免疫组化及RT-PCR结果表明:正常口腔黏膜上皮中无Survivin阳性表达;OSF组Survivin阳性表达率为47.5%(19/40),其中早期为30.0%(3/10),中期为46.7%(7/15),晚期为60.0%(9/15);OSF癌变组阳性率高达95.2%(40/42)。Survivin在OSF癌变组中阳性率高于OSF组,差异有统计学意义(P<0.01);而OSF早、中、晚期三组间Survivin阳性表达率虽逐渐增高,但其差异并无统计学意义(P>0.05)。Western blotting证实了上述结果。Survivin mRNA的表达与OSF癌变患者的年龄、肿瘤大小、肿瘤部位及临床TNM分期均无明显相关。
     3.免疫组化结果提示:p-Survivin在正常口腔黏膜上皮中无阳性表达;OSF组p-Survivin阳性表达率为50.0%(20/40),其中早期为30.0%(3/10),中期为46.7%(7/15),晚期为66.7%(10/15);OSF癌变组阳性率高达97.6%(41/42)。OSF癌变组中p-Survivin阳性表达率高于OSF组,差异有统计学意义(P<0.01);p-Survivin的表达率在OSF早、中、晚期三组之间相比差异无统计学意义(P>0.05)。Western blotting结果与免疫组化检测的结果基本吻合。
     4.Western blotting分析表明:正常口腔黏膜上皮中Cyclin B1表达极弱,未检测到p34~(cdc2)和p-p34~(cdc2)的阳性表达;Cyclin B1、p34~(cdc2)和p-p34~(cdc2)的表达在OSF早、中和晚期组织中表达逐渐增强;OSF癌变组织中Cyclin B1、p34~(cdc2)和p-p34~(cdc2)的表达最强。Cyclin B1、p34~(cdc2)和p-p34~(cdc2)在OSF组中阳性表达高于正常口腔黏膜组,差异有统计学意义(P<0.05);而这些G_2/M期分子在OSF癌变组中的阳性表达高于OSF组,差异有统计学意义(P<0.05);但在OSF早、中、晚期三组之间相比则差异无统计学意义(P>0.05)。
     5.免疫共沉淀实验证实了p34~(cdc2)与Survivin的结合。
     结论
     1.年龄、嚼槟榔持续时间、吸烟持续时间、是否合并OLK或OLP与OSF癌变密切相关,可能是OSF癌变的危险因素。
     2.Survivin在OSF及其癌变组织中的过度表达与OSF癌变密切相关。Survivin在其中参与了细胞凋亡的抑制和有丝分裂的干扰,对癌变具有促进作用,这可能是OSF癌变过程中的一个重要分子机制。Survivin对OSF及其癌变的早期诊断和治疗具有重要的临床意义,有望成为诊断标志物及治疗靶。
     3.细胞周期G_2/M期重要激酶p34~(cdc2)-Cyclin B1复合物促进Survivin Thr34位的磷酸化,进一步说明Survivin在OSF癌变中具有功能活性。
     4.从细胞周期的角度证实了Cyclin B1、p34~(cdc2)在OSF及其癌变组织中的过表达引起的细胞周期G_2/M检测点紊乱可能是OSF癌变过程中另一重要的分子机制。
Background and Objectives
     Oral submucous fibrosis(OSF),a kind of oral mucosa diseases,is regarded as the precancerous condition of oral squamous cell carcinoma (OSCC).It is predominantly seen in South and Southeast Asia,including India,Bangladesh,Pakistan and Taiwan.On the Chinese mainland,OSF is common in Hunan Province and Hainan Province.Its distribution is associated with chewing betel quid(BQ).The malignant transformation rate of OSF is 7~13%depending on the different study population mainly in India and Taiwan,and it is expected to rise in recent years.As far as we know,the carcinogenesis of OSF is a complex and multi-step process that results from multiple environmental factors and genetic susceptibility. However,its pathogenesis remains unclear.In view of this,the exact mechanisms of the malignant transformation of OSF needs to be investigated further.
     First of all,from the epidemiological point of view we used logistic regression analysis to investigate the risk factors for carcinogenesis of OSF so as to provide the evidence for treatment and self-prevention. Secondly,we chose Survivin and its related molecules as the delegates in our study.From the perspective of molecular biology,we explored the pathogenesis of the carcinogenesis of OSF reined to two aspects of blocked apoptosis and cell cycle disorders,which could provide a theoretical basis for early diagnosis and treatment.
     Methods
     Firstly,a case-control study was performed between 42 patients with OSCC originating from OSF and 40 patients with OSF.The numeral relationship between the 13 interrelated factors and malignant transformation of oral submucous fibrosis was studied by the multivariate logistic regression analysis.Secondly,the expression of Survivin was analyzed by immunohistochemical SP method,reverse transcription polymerase chain reaction(RT-PCR) and Western blotting assay in 10 cases of normal oral mucosal epithelium,40 cases of OSF epithelium(10 cases of early stage,15 cases of moderately advanced stage,and 15 cases of advanced stage) and 42 cases of OSCC originating from OSF, respectively.Thirdly,we used immunohistochemical SP method and Western blotting assay to detect the expression of p-Survivin in those tissues,respectively.Fourthly,Western blotting assay was used to examine the expressions of Cyclin B1、p34~(cdc2)and p-p34~(cdc2) in the tissues, respectively.Finally,Co-immunoprecipitation was used to confirm the relationship between the p34~(cdc2) and Survivin.
     Results
     1.Logistic regression analysis indicated that the four factors including age,duration of BQ chewing,duration of cigarette smoking, and OSF accompanied by oral leukoplakia(OLK) or oral lichen planus(OLP) entered the logistic regression equation.
     2.The results of immunohistochemical SP method and RT-PCR showed that Survivin was not detected in normal oral mucosal epithelium; the rate of Survivin detection in OSCC originating from OSF(95.2%, 40/42) was significantly higher than that in OSF(47.5%,19/40)(P<0.01); no statistically significant difference was found in the rates of Survivin expression among the early stage(30%,3/10),the moderately advanced stage(46.7%,7/15)and the advanced stage(60.0%,9/15) of OSF(P>0.05).Western blotting analysis further confirmed the phase expression of Survivn protein in carcinogenesis of OSF.For patients with OSCC originating from OSF,Survivin mRNA expression was not correlated to age,tumor size,tumor location or TNM stage.
     3.The results of immunohistochemical SP method showed that the expression of p-Survivin was negative in normal oral mucosal epithelium; the positive staining rate of p-Survivin in OSCC originating from OSF (97.6%,41/42) was significantly higher than that in OSF(50.0%,20/40) (P<0.01);however,the rate of p-Survivin detection showed no significant difference among the early stage(30.0%,3/10),the moderately advanced stage(46.7%,7/15) and the advanced stage(66.7%,10/15)of OSF(P>0.05).Western blotting analysis showed gradually increasing expression of p-Survivin protein as the stage of OSF increased,which was consistent with the results of immunohistochemical SP method.
     4.Western blotting analysis indicated that p34~(cdc2) and p-p34~(cdc2) were not detected in normal oral mucosal epithelium;the expression of Cyclin B1 was very weak in normal oral mucosal epithelium;there were gradually increasing expressions of Cyclin B1,p34~(cdc2) and p-p34~(cdc2) as the stage of OSF increased;the expressions of Cyclin B1,p34~(cdc2) and p-p34~(cdc2) in OSF group were significantly higher than those in normal group(P<0.05);the expressions of these molecules showed significant diferent(P<0.05) between the OSF and the OSCC originating from OSF, but there was no significant difference among the early stage,the moderately advanced stage and the advanced stage of OSF(P>0.05).
     5.Co-immunoprecipitation assay confirmed the combination of p34~(cdc2) and Survivin.
     Conclusions
     1.This study identified that age,duration of BQ chewing,duration of cigarette smoking,and presence of OLK or OLP may be the risk factors in carcinogenesis of OSF.
     2.The over-expression of Survivin in OSF and OSCC originating from OSF is closely associated with malignant transformation of OSF. Survivin,as a promoting factor in carcinogenesis of OSF,takes part in the inhibition of apoptosis and mitotic interference in the course,which may be an important molecular mechanism in the carcinogenesis process of OSF.Survivin may be helpful in early diagnosis and therapy of carcinogenesis of OSF and may provide an index for diagnosis as well as a target for treatment.
     3.P34~(cdc2)-Cyclin B1 complexes,the important kinase of G_2/M phase transition in cell cycle,could promote Survivin Thr34 phosphorylation.It further validates that Survivin has functional activity in malignant transformation of OSF.
     4.From the perspective of the cell cycle,it was confirmed that cell cycle G_2/M checkpoint disorder resulted from the over-expression of Cyclin B1 and p34~(cdc2) in OSF and OSCC originating from OSF,which may be another important molecular mechanism in the carcinogenesis process of OSF.
引文
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