[摘要] 目的：探讨肾癌组织高表达的miR-19a-3p 靶向调控细胞黏附分子2（cell adhesion molecule 2，CADM2）并通过AKT信号通路影响肾癌细胞增殖和迁移的机制。方法：收集2012 年4 月至2017 年11 月苏州大学附属第一医院肾内科收治的42 例资料完整的肾癌患者手术切除的肾癌组织和癌旁组织标本。采用qPCR检测肾癌组织和786-O等4 种肾癌细胞系中miR-19a-3p 的表达水平，CCK-8、Transwell 和免疫荧光法检测miR-19a-3p 敲减对肾癌786-O 细胞增殖、侵袭和上皮间质转化的影响，双荧光素酶报告基因验证miR-19a-3p 与CADM2 的靶向关系。采用Wb 检测miR-19a-3p 通过CADM2 对AKT信号通路的调控作用。结果：miR-19a-3p 在肾癌组织及细胞系中均高表达（均P<0.01）。敲减miR-19a-3p 可显著抑制786-O 细胞增殖、迁移和上皮间质转化，且miR-19a-3p 靶向作用CADM2 并下调其表达水平（P<0.05 或P<0.01）。敲减miR-19a-3p 通过靶向上调CADM2 并阻断AKT信号通路进而显著抑制786-O细胞增殖、迁移和上皮间质转化（均P<0.05 或P<0.01），从而缓解肾癌发生发展。结论：肾癌组织中miR-19a-3p 高表达，敲减miR-19a-3p 可显著抑制肾癌细胞的增殖、迁移和上皮间质转化，其机制可能是通过miR-19a-3p/CADM2/AKT分子轴起作用。

[Abstract] Objective: To explore the mechanism of miR-19a-3p regulating cell adhesion molecule 2 (CADM2) to inhibit the proliferation and metastasis of renal carcinoma cells via the AKT signaling pathway. Methods: A total of 42 patients with renal cancer admitted to Department of Nephrology, the First Affiliated Hospital of Suzhou University from April 2012 to November 2017 were enrolled to collect samples of surgically resected renal carcinoma tissues and paracancerous tissues. Expression of miR-19a-3p was detected in renal carcinoma tissues and 4 types of renal carcinoma cell lines such as 786-O by quantitative Real-time polymerase chain reaction (qPCR).The effects of miR-19a-3p knockdown on proliferation, invasion and epithelial mesenchymal transition (EMT) of renal carcinoma 786-O cells were evaluated by CCK-8 assay, Transwell assay and immunofluorescence, respectively. Subsequently, dual luciferase reporter assay was used to verify whether CADM2 was a target gene of miR-19a-3p. Furthermore, Wb was applied to detect the regulatory effect of miR-19a-3p on AKT signaling pathway through CADM2. Results: miR-19a-3p expression was significantly up-regulated in renal carcinoma tissues and cell lines (all P<0.01). Knockdown of miR-19a-3p could inhibit proliferation, invasion and EMT process of 786-O cells; furthermore, the results indicated that CADM2 was a direct target of miR-19a-3p and its expression was down-regulated (P<0.05 or P<0.01). Additionally, knockdown of miR-19a-3p obviously suppressed proliferation, migration and EMT process of 786-O cells via up-regulating CADM2 and blocking AKT pathway (all P<0.05 or P<0.01), thus alleviating the occurrence and development of renal carcinoma. Conclusion: The study demonstrates that miR-19a-3p has a high expression level in renal carcinoma tissues; knockdown of miR-19a-3p could significantly inhibit the proliferation, migration and EMT process of renal carcinoma tissues, and its mecha-nism may be associated with miR-19a-3p/CADM2/AKT axis.

苏州市科技发展计划资助项目（No. YSD2018149）