claudin-23在结直肠癌组织中的表达及其对人结直肠癌细胞生物学行为的影响

目的 了解claudin-23在结直肠癌中的表达及其对人结直肠癌细胞株生长、增殖及迁移能力的影响。方法 自四川大学华西医院疾病组织标本库选取6对结直肠癌组织及相应癌旁正常组织标本，采用实时荧光定量PCR检测组织标本中claudin-23基因的表达量。构建稳定过表达claudin-23的结直肠癌细胞株，用实时荧光定量PCR及蛋白质印迹验证后，采用CCK-8、Transwell细胞迁移实验检测过表达claudin-23对人结直肠癌细胞生长、增殖以及迁移能力的影响。结果 在结直肠癌组织中claudin-23的表达量较癌旁正常组织中减少（P<0.05），过表达claudin-23后HCT15细胞间的黏附性降低，细胞呈离散型生长，并且可促进HCT15细胞的生长增殖，此外，过表达claudin-23可使RKO细胞及HCT15细胞的迁移能力明显增强。结论 claudin-23可显著提高人结直肠癌细胞的迁移能力，提示claudin-23可能与结直肠癌的转移相关。

The Expression and Biological Function of claudin-23 in Colorectal Cancer

Objective To determine the expression of claudin-23 in colorectal cancer and paracarcinoma tissues, and its effects on the proliferation and migration of colorectal cancer cells. Methods Six pairs of samples of colorectal cancer and corresponding paracarcinoma tissues were collected from the West China Hospital of Sichuan University. Quantitative real time PCR was performed to determine the expression of claudin-23 in the tissue samples. Colorectal cancer cell lines with stable overexpression of claduin-23 were constructed using lentivirus. CCK-8 and migration assays were conducted to identify the effects of claudin-23 on cell proliferation and migration. Results The expression of claudin-23 in colorectal cancer tissues decreased compared with their adjacent normal tissues (P<0.05). claudin-23 decreased cell adhesion and increased cell proliferation in HCT15 cells. RKO and HCT15 cells with over expressed claudin-23 had increased ability of migration. Conclusion claudin-23 facilitates the migration ability of colorectal cancer cells and may participate in the metastasis of colorectal cancer.