FRZB基因在胃癌组织中的表达和胃癌细胞内定位及其意义

目的研究FRZB基因在胃癌中的表达和在细胞内的定位及其意义。方法通过免疫组织化学（免疫组化）链霉菌抗生物素蛋白．过氧化酶连接法（SP法）对90例胃癌组织及正常胃黏膜组织FRZB基因的表达进行分析。通过定量PCR和Western印迹检测胃癌细胞株和胃上皮细胞株GES-1的FRZB表达，并用免疫荧光技术对FRZB的细胞内定位进行研究。结果FRZB在胃癌中的表达高于正常胃黏膜，在胃癌组织中，FRZB表达阳性率为92．2％，而正常胃黏膜中除了1例（10．0％）为弱阳性表达外，其余均为阴性。FRZB在胃癌组织中的表达与分化程度（P=0．220）和Lauren分型（P〈0．01）相关，与其他的临床病理参数不相关。免疫荧光和Western印迹结果显示，FRZB在细胞核和细胞质中均有表达。定量PER结果显示，在胃癌细胞株中FRZB表达高于GES-1。结论FRZB与胃癌的分化和肠型及弥漫型的发生相关，FRZB在细胞核的定位可能与其在胃癌中的作用相关。

Expression and intracellular localization of FRZB gene in gastric cancer and its significance

OBJECTIVE: To study the expression and intracellular localization of FRZB gene in gastric cancer tissue, and to explore its significance in gastric cancer. METHODS: The expression of FRZB in tumor tissues from 90 patients with gastric cancer and in normal gastric mucous as control were analyzed by immunohistochemistry in tissue array. FRZB expression in gastric cancer cell lines and immortalized gastric epithelial cell line GES-1 were detected by quantitative real-time PCR(Q-PCR) and Western blot. The intracellular localization of FRZB was observed by immunofluorescence staining. RESULTS: The positive expression rate of FRZB in gastric cancer was 92.2%. FRZB expressed in gastric cancer with well differentiation was higher than that with poor differentiation.The positive rate in normal gastric mucous was 10.0% (one out of ten). By confocal microscope, FRZB localized both in cytoplasma and nucleus, especially on the nuclear membrane. The Q-PCR and Western blot results also showed that the expression of FRZB in gastric cancer cell lines was higher than that in GES-1. CONCLUSIONS: The expression of FRZB in gastric cancer is correlated with tumor cell differentiation and tumor Lauren classification. The nuclear localization of FRZB may contribute to its function in gastric cancer formation and progression.