原发性肝细胞癌p53基因突变检测

为了解在黄曲霉毒素Ｂ１（ＡＦＢ１）低含量区以ＨＢＶ为主要危险因素的ＨＣＣｐ５３基因突变情况，并分析它与ＨＢＶ及其它因素的关系，作者筛检了成都地区３２例原发性肝癌（ＨＣＣ），分别应用ＰＣＲ－ＲＦＬＰＳｏｕｔｈｅｒｎ吸印杂交及免疫组化染色法检测了３２例ＨＣＣ及２７份癌旁肝组织中ｐ５３基因突变、ＨＢＶＤＮＡ整合及ＨＢｓＡｇ表达。结果：所有ＨＣＣ病例均感染过ＨＢＶ，肝癌细胞中ＨＢＶＤＮＡ整合率７１．９％，癌旁组织均有肝硬化或／和慢活肝病变，且ＨＢｓＡｇ表达率９６．３％。３２例ＨＣＣ中检出８例Ｐ５３蛋白阳性（２５％），这种改变与ＨＢＶＤＮＡ整合及ＨＢｓＡｇ表达无明显关系，而与ＨＣＣ发生年龄有关；３２例ＨＣＣ组织中有２例ｐ５３基因第２４９号编码子突变（６．２５％），明显低于ＡＦＢ１高含量区ＨＣＣ，而与台湾、日本等ＡＦＢ１低含量区报道一致，提示：成都地区ＨＣＣ与ＨＢＶ感染确有密切关系；ｐ５３改变在ＨＣＣ发生上有一定作用，但是多数ＨＣＣ并无ｐ５３基因突变又提示ＨＣＣ发生尚涉及其它复杂机制；ＨＢＶ在ＨＣＣｐ５３基因改变中的作用机制值得进一步探索。

Detection of p53 Gene Mutations in Hepatocellular Carcinoma

This study screened 32 cases of hepatocellular carcinoma (HCC) from Chengdu detecting HBV DNA. HBsAg and p53 mutations by using Southern blot hybridization, immunohistochemistry and polymerase chain reaction/restriction enzyme digest methods, respectively. The results revealed all the cases had been infected by HBV; the freqency of HBV DNA integration into HCC cell was 72%, and the positive staining for HBsAg 96.3%(26/27). Of the 32 cases, 8 showed nuclear staining of p53 protein (25%), no mutation of p53 gene at all in 27 nontumorours liver tissues was identified. The resluts suggest the inactivation of p53 function may play a significant role in the genesis of HBV associated HCC; however, the largely negative p53 mutation rsults in the current study conversely indicate that hepatocarcinogenesis may even involve other comprehensive mechanisms. Further studies are worth doing to evaluate the possible contribution of HBV to the p53 mutation in HCC.