Galectin-1在大肠癌组织中的表达及其临床意义

目的 检测Galectin-1在大肠癌组织、癌旁正常组织及淋巴结转移癌中的表达情况,初步探讨其与大肠癌发生发展,侵袭转移的关系.方法 (1)用SP免疫组化法检测158例临床石蜡组织标本(癌旁正常组织30例,腺瘤组织25例.大肠癌组织65例,淋巴结转移癌38例)中的Galectin-1蛋白的表达.(2)用实时RT PCR法分析Galectin-1mRNA在32对新鲜大肠癌组织及相应癌旁正常组织中的表达情况.结果 (1)Galectin-1蛋白在癌旁正常组织、腺瘤及大肠癌组织中的表达具有明显差异,其强阳性率逐渐增加;正常粘膜中的强阳性率为0,在腺瘤中的强阳性率为8%,两者之间有显著性差异(P=0.000);在大肠癌组织中的强阳性率为66%,明显高于腺瘤组织,两者之间有显著性差异(P=0.000);淋巴结转移癌中Galectin-1的强阳性率为86%,明显高于大肠癌组织,两者之间有显著性差异(P=0.022);在浸润程度深、分化程度低及发生淋巴结转移的大肠癌组织中的表达明显高于浸润程度浅、分化程度高及未发生淋巴结转移的大肠癌组织(P＜0.05).(2)在32对大肠癌组织中浸润程度深、分化程度低及发生淋巴结转移的组织中的Galectin-1mRNA表达明显高于浸润程度浅、分化程度高及未发生淋巴结转移的组织.其表达量的平均倍比关系分别为1.98、2.27、1.42倍.结论 Galectin-1参与了大肠癌的发生发展过程,可能与大肠癌的浸润、分化及淋巴结转移有一定的相关性.

Galectin-1 expression in human colorectal carcinoma and its clinical significance

Objective To investigate the correlation between galectin-1 expression and the biological behaviors of human colorectal carcinoma. Methods SP immunohistochemistry was used to detect the expression of galectin-1 in 158 paraffin-embedded specimens including 30 normal mucosa, 25 adenoma, 65 colorectal carcinoma and 38 metastatic tumor specimens. Real-time RT-PCR was used to detect galectin-1 mRNA expression in 32 fresh specimens of colorectal carcinoma and normal mucosa. Results The positive expression level of galectin-1 was significantly different between normal mucosa, adenoma, colorectal carcinomas and metastatic tumors, with positiveity rate of 0, 8%, 66% and 86%, respectively (P<0.05). Galectin-1 expression in moderately or well differentiated colorectal carcinomas was significantly lower than that in poorly differentiated ones (P=0.031), and its expression in invasive carcinomas was significantly higher than that in non-invasive carcinomas (P=0.000). Galectin-1 expression in colorectal carcinomas was significantly related with lymph node metastasis (P=0.004). In poorly differentiated colorectal carcinomas, the expression of galectin-1 mRNA was about 2.27 times that in moderately or well differentiated colorectal carcinomas (P=0.00); galectin-1 mRNA expression in invasive carcinoma was 1.98 times that in non-invasive carcinoma (P=0.002). In tumors with lymph node metastasis, galectin-1 mRNA expression was 1.42 times that in tumors without metastasis (P=0.018). Conclusion Galectin-1 can be involved in the development and progression of colorectal carcinoma, and may relate to the infiltration, differentiation and lymph node metastasis of colorectal carcinoma.