抑癌候选基因Ndrg2在结直肠癌组织中的表达特点及意义

目的 探讨抑癌候选基因Ndrg2在不同分化级别结直肠癌组织中的表达特点,分析其调控结直肠癌细胞分化的意义.方法 收集50例不同分化级别结直肠癌组织标本,分别通过免疫组织化学染色及蛋白印迹分析检测Ndrg2的表达;以150点结直肠癌组织芯片大样本分析Ndrg2的表达特点.结合组织芯片相关病例信息进行统计学分析.结果 32例结直肠癌组织Ndrg2表达显著低于其自身癌旁组织及正常组织,癌旁组织中的表达也显著低于正常组织中的表达.组织芯片统计分析显示,不同分化程度结直肠癌组织Ndrg2的表达差异有统计学意义(P=0.005);而Ndrg2表达与患者的年龄、性别、肿瘤部位、结直肠癌浸润深度、淋巴转移及UICC分期无关.结论 Ndrg2可能参与调控结直肠癌细胞的分化过程.

Expression and significance of new candidate tumor suppressor gene N-Myc downstream-regulated gene 2 in colorectal cancer

Objective To determine the expression of new candidate tumor suppressor gene N-Myc downstream-regulated gene 2(Ndrg2) in colorectal cancer with different differentiation, and analyze its clinical significance. Methods Specimens of 50 colorectal cancer patients with different differentiation were collected, Immunohistochemistry and Western blot were used to examine the expression of Ndrg2. Colorectal cancer tissue array in large scale was applied to analyze the expression of Ndrg2 and the statistics analysis was performed referring to the patients information of the array. Results Among 50 cases, Ndrg2 expression level of colorectal cancer was significantly lower in 32 cases as compared to adjacent and normal tissue of the same individual, while Ndrg2 expression of adjacent tissue was significantly lower than that of normal tissue. Ndrg2 protein levels increased from poor-differentiated to well-differentiated carcinomas (P=0.005). Conclusions The expression of Ndrg2 in different differentiated colorectal cancer tissues show a significant distinction. Ndrg2 may be involved in the regulation of differentiation in colorectal cancer.