应用组织芯片技术检测KAI1、MRP-1、FAK蛋白在肺癌组织中的表达

背景与目的:肿瘤的发生发展、浸润转移与多基因改变密切相关。目前Kang-ai-1(KAI1)、移动相关蛋白(motility-relatedprotein-1,MRP-1)和局部粘着斑激酶(focaladhesionkinase,FAK)3种基因在肺癌中的共同作用研究较少。本研究旨在探讨这3种基因的蛋白产物在肺癌发生发展中的作用及其在肿瘤诊断和预后判断中的价值。方法:应用免疫组化SP方法检测包含240个点的肺癌组织芯片中KAI1、MRP-1和FAK蛋白的表达。结果:KAI1在肺癌原发灶中阳性率为25.9%,MRP-1为42.6%,与正常肺组织(100%)相比均显著下调;FAK蛋白在肺癌组织中阳性率为44.4%,与正常肺组织相比显著增高;KAI1、FAK两种蛋白在肺癌组织中的表达与患者的年龄、性别、肿瘤的大体类型及组织类型无关,而与肿瘤的分化程度、临床分期及是否伴有淋巴结转移密切相关,两种蛋白的表达呈显著负相关。MRP-1蛋白在肺癌组织中的表达与组织类型有关,小细胞肺癌与非小细胞肺癌相比差异显著,MRP-1与KAI1呈显著正相关,与FAK呈显著负相关。结论:KAI1、MRP-1和FAK的异常表达与肺癌的浸润转移有关,联合检测这3项指标对肺癌的发生发展有重要的预测作用。

Expression of KAI1, MRP-1, and FAK proteins in lung cancer detected by high-density tissue microarray

BACKGROUND & OBJECTIVE: The genesis, development, invasion, and metastasis of tumor are closely correlate with alterations of multi-genes. At present, the roles of Kang-ai-1 (KAI1), motility-related protein-1 (MRP-1), and focal adhesion kinase (FAK) in lung cancer have seldom been reported. This study was designed to investigate the roles of KAI1, MRP-1, and FAK in tumorigenesis and development of lung cancer, and their values in diagnosis and predicting the prognosis of lung cancer. METHODS: The expression of KAI1, MRP-1, and FAK proteins in a high-density tissue microarray containing 240 spots were detected by SP immunohistochemistry. RESULTS: The positive rates of KAI1 and MRP-1 were significantly lower in primary lung cancer than in normal lung tissue (25.9% vs. 100%, 42.6% vs. 100%, P<0.05). The positive rate of FAK was significantly higher in primary lung cancer than in normal lung tissue (44.4% vs. 10.0%, P<0.05). The expression of KAI1, FAK, and MRP-1 in primary lung cancer had no correlation with age and gender of the patients, and macroscopic and histological type of tumor, but had correlations with tumor differentiation, clinical stage, and lymph node metastasis. In addition, the expression of MRP-1 had correlation with histological type of tumor; the positive rate of MRP-1 was significantly lower in small cell lung cancer than in non-small cell lung cancer (0 vs. 50.0%, P<0.05). KAI1 expression was negatively correlated to FAK expression (rs=-0.458, P<0.05); MRP-1 expression was positively correlated with KAI1 expression (rs=0.535, P<0.05), and negatively correlated with FAK expression (rs=-0.438, P<0.05). CONCLUSIONS: The abnormal expression of KAI1, MRP-1, and FAK proteins are related to invasion and metastasis of lung cancer. Combined detection of the 3 proteins may be useful in predicting the development and prognosis of lung cancer.