中文摘要：

目的 研究DNA结合蛋白A（dbpA）基因在结直肠癌组织和细胞中的表达及其临床意义.方法 采用免疫组织化学方法检测60例结直肠癌患者癌组织及癌旁正常结直肠黏膜组织中dbpA蛋白的表达,采用免疫荧光及反转录PCR法检测结直肠黏膜上皮细胞系FHC、人结直肠腺癌细胞系SW480、RKO、SW620、DLD-1、HT-29、SW1463及患者癌组织、癌旁组织中dbpA mRNA表达,Western blot法检测结直肠癌组织及细胞中蛋白的表达变化.结果 在正常结直肠组织中dbpA蛋白和mRNA无表达或低表达,在结直肠癌组织中dbpA表达明显增高.结直肠癌中dbpA mRNA阳性表达率升高,分别为80.0％（48/60）、10.0％（6/60）,dbpA蛋白阳性表达率升高,分别为83.3％（50/60）、10.0％（6/60）,差异均有统计学意义（P＜0.01）.在FHC细胞中dbpA无表达,在6株结直肠癌细胞中,dbpA不同程度高表达（P＜0.05）.dbpA高表达与结直肠癌浸润深度、淋巴结转移、组织学分型及脉管侵犯相关（P＜0.05）,dbpA高表达组预后较差（P＜0.05）.结论 dbpA的升高可能在结直肠癌的发生发展中起重要作用,可能是结直肠癌的一个预后指标。

英文摘要：

Objective To investigate the expression of DNA binding protein A （dbpA） in patients with colorectal carcinoma of different stages and its significance.Methods Expression of dbpA protein and mRNA in specimens of normal tissues and colorectal cancer were detected by immunohistochemistry,expression of dbpA mRNA and protein of colorectal cancer cell lines SW480,RKO,SW620,DLD-1,HT-29,SW1463 and tissues were detected by immunohistochemistry,RT-PCR and Western blot.Results There was no positive staining dbpA protein and mRNA in normal colorectal tissues.However,dbpA was expressed in epithelial cells of colorectal mucosa [dbpA mRNA：80.0 % （48/60）,10.0 % （6/60）;dbpA protein：83.3 % （50/60）,10.0 % （6/60）,P 〈 0.01].And there was no expression in normal colorectal cell,but its expression was high in 6 colorectal cancer cells （P 〈 0.05）.The high expression of dbpA was correlation with the infiltration depth,lymph node metastasis and type of histology （P 〈 0.05）,and had effect in prognosis of colorectal cancer （P 〈 0.05）.Conclusion Elevated dbpA may be related to the pathogenesis and development of colorectal carcinoma,and dbpA may be a prognostic factor of colorectal carcinoma.