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中国癌症防治杂志 ›› 2016, Vol. 8 ›› Issue (1): 1-6.doi: 10.3969/j.issn.1674-5671.2016.01.01

• 基础研究 •    下一篇

乙型肝炎病毒及黄曲霉毒素双暴露下肝细胞癌中p53基因突变及蛋白表达的意义

  

  1. 广西医科大学附属肿瘤医院肝胆外科;广西肿瘤防治研究所;区域性高发肿瘤早期防治研究教育部重点实验室;广西医科大学第一附属医院肝胆外科
  • 出版日期:2016-02-25 发布日期:2016-03-11
  • 通讯作者: 黎乐群 li_lequn@263.net
  • 基金资助:

    国家自然科学基金资助项目(81160262);广西卫计委科研课题(Z2015710)

Significance of p53 gene mutation and expression in human primary hepatocellular carcinoma in the presence of hepatitis B virus and aflatoxin B1

  • Online:2016-02-25 Published:2016-03-11

摘要:

目的  探讨在乙型肝炎病毒(hepatitis B virus,HBV)和黄曲霉毒素B1(aflatoxin B1,AFB1)双暴露下肝细胞癌(hepatocelluar carcinoma,HCC)中p53基因突变及其蛋白的表达,并分析其意义。方法 根据HBV与AFB1的暴露情况,将广西地区HCC 82例患者分为HBV(+)/AFB1(+)(实验组A组)44例;HBV(+)/AFB1(-)(对照组B组)15例;HBV(-)/AFB1(+)(对照组C组)15例;HBV(-)/AFB1(-)(对照组D组)8例,另收集肝外伤、肝血管瘤等20例肝切除组织作为正常对照组。用PCR技术及免疫组化法对p53基因11对外显子的突变及蛋白的表达进行检测。结果 82例HCC患者p53exon7-249阳性突变率为40.2%,正常对照组的阳性突变率为0,实验组A组、对照组B组、对照组C组和对照组D组的阳性突变率分别为50.0%、13.3%、46.7%和25.0%,其中实验组A组比对照组B组有更高的突变率(P<0.05),其余各组比较差异均无统计学意义 (P>0.05)。82例HCC患者中p53蛋白的阳性表达率为74.4%,正常对照组p53蛋白表达的阳性率为0,实验组A组、对照组B组、对照组C组和对照组D组的阳性表达率分别为90.9%、46.7%、73.3%和37.5%,其中实验组A组分别比对照组B组、对照组D组有更高的阳性表达率 (P<0.05),其余各组比较差异均无统计学意义 (P>0.05)。p53exon7-249突变与p53蛋白的表达呈正相关(P<0.05)。 结论 在广西地区HBV和AFB1双暴露因素下的HCC发生过程中,p53基因有更高的突变率及蛋白表达,尤以p53exon7-249突变为其特征性改变,为该地区HCC发生常见的一种分子生物学事件;p53基因的高突变率及其蛋白高表达率可能为HBV和AFB1协同作用的结果。

关键词: 肝肿瘤, 乙型肝炎病毒, 黄曲霉毒素B1, p53, 突变

Abstract:

Objective To explore p53 gene mutation and expression in hepatocellular carcinoma (HCC) in the presence of both hepatitis B virus (HBV) and aflatoxin B1 (AFB1). Methods A total of 82 patients from Guangxi province with HCC were divided into four groups based on their HBV and AFB1 status:HBV(+)/AFB1(+) (n=44),HBV(+)/AFB1(-)(n=15), HBV(-)/AFB1(+) (n=15),and HBV(-)/AFBB1(-)(n=8). As an additional control group,hepatic tissues from 20 patients with liver trauma or hepatic hemangioma were analyzed. PCR and immunohistochemistry were used to examine 11-pairs exons of p53 mutations and expression of p53 protein. Results The rate of patients showing mutations in p53 exon7-249 among all 82 study participants with HCC was 40.2%;the rates in each HCC group were as follows:HBV(+)/AFB1(+),50.0%;HBV(+)/AFB1(-),13.3%; HBV(-)/AFB1(+),46.7%;and HBV(-)/AFB1(-),25.0%. None of the non-HCC controls showed mutations in this exon. The mutation rate was significantly higher in the HBV(+)/AFB1(+) group than in the HBV(++)/AFB1(-) group (P<0.05);differences among the rest of the HCC groups were not significant(P>0.05). Rate of tissue positivity for p53 protein was 74.4% among all 82 patients with HCC;the rates in individual groups were as follows:HBV(+)/AFB1(+),90.9%; HBV(+)/AFB1(-),46.7%;HBV(-)/AFB1(+),73.3%;and HBV(-)/AFB1(-), 37.5%. The rate of protein positivity was 0 among non-HCC controls. Rate of p53 positivity was significantly higher in the HBV(+)/AFBB1(+) group than in the HBV(+)/AFB1(-) and HBV(-)/AFB1(-) groups (P<0.05). No significant differences were observed among the rest of the HCC groups(P>0.05). Generally,mutation in p53exon7-249 positively correlated with p53 protein expression(P<0.05).Conclusions Among patients with HCC from Guangxi province,p53 mutation and expression are prevalent, and p53 exon7-249 appears to be a mutational hot spot in this part of China. The high rate of p53 mutation and high p53 expression may be related to the synergy of HBV and AFB1 exposure in this region.

Key words: Liver neoplasm, Hepatitis B virus, Aflatoxin B1, p53, Mutation