BAMBI在非小细胞肺癌中的分布和mRNA表达

Distribution and mRNA Expression of BAMBI in Non-small-cell Lung Cancer

背景与目的BAMBI(BMP and activin membrane-bound inhibitor)与TGF-βⅠ型受体具有相似的结构,从而广泛参与TGF-β信号的调控。通过检测BAMBI在非小细胞肺癌(non-small cell lung cancer,NSCLC)组织中的表达分布情况,探讨其与NSCLC临床病理因素之间的关系。方法63例NSCLC及癌旁正常组织标本用于免疫组织化学检测。其中31例新鲜肺癌组织及癌旁正常肺组织标本,术后立即投入液氮速冻之后,于-70℃保存,用于RT-PCR检测。结果BAMBI mRNA在癌旁组织中有较弱的表达,其在癌组织中的表达高于相应的癌旁组织(0.358±0.135 vs 0.249±0.129),差异具有统计学意义(P=0.003)。BAMBI蛋白主要表达在胞膜和靠近胞膜的胞浆,其在癌组织中的表达高于癌旁组织,两者差异具有统计学意义(P<0.01)。其蛋白和mRNA在NSCLC癌组织中的表达显著高于癌旁组织,其在肺鳞癌中的表达低于肺腺癌。结论BAMBI在非小细胞肺癌中表达明显增加,BAMBI的过表达与非小细胞肺癌的发生有关。

Background and objective BAMBI structure is similar with that of the receptor Ⅰ of TGF- β, it broadly participates in the control of TGF- β signaling. The aim of this study is to investigate the expression and its significance of BAMBI in non-small cell lung cancer （NSCLC） and explore the relation between BAMBI and clinical and pathological factors of NSCLC. Methods Sixty-three cases with NSCLC and adjacent normal tissue specimens were used for immunohistochemical assay. Thirty-one fresh lung cancer tissue specimens and surrounding normal lung tissue specimens was preserved for RT-PCR in -70 ℃ after quick-frozen in liquid nitrogen immediately. Results The level of BAMBI mRNA in cancer tissues was higher than that in the corresponding adjacent tissues （0.358±0.135 vs 0.249±0.129）, with the difference being statistically significant （P=0.003）. BAMBI protein expressed mainly in the membrane and the cytoplasm close to the membrane, its expression in the cancer tissue was higher than that in the adjacent tissues, the difference was significant （P〈0.01）. Expression of BAMBI in the cancer tissue was higher than that in the adjacent tissues, and the expression of BAMBI in adenocarcinoma of lung is higher than that in squamous carcinoma. Conclusion The expressions of BAMBI significantly increase in NSCLC. It might be a common affair in carcinogenesis of NSCLC.