[摘要] 目的：探讨敲降miR-135a 对人喉癌上皮Hep-2 细胞的恶性生物学行为和奥沙利铂敏感性的影响。方法：收集2018年1 月至2018 年6 月郑州大学附属南阳医院南阳市中心医院行喉癌切除术10 例患者的喉癌组织和癌旁组织标本。采用qPCR检测喉癌组织和Hep-2 细胞中miR-135a 的表达水平。miR-135 inhibitor 转染喉癌Hep-2 细胞后，采用CCK-8 检测Hep-2 细胞活性，集落形成实验检测Hep-2 细胞集落形成能力，Transwell 实验检测Hep-2 细胞的侵袭及迁移能力，WB实验检测Hep-2 细胞中SOX2蛋白的表达水平。0.5、1.0、1.5、2.0 μmol/L的奥沙利铂处理已转染miR-135 inhibitor 的Hep-2 细胞，CCK-8 实验检测Hep-2 细胞的增殖活性，Annexin-V-FITC/PI 染色流式细胞术检测Hep-2 细胞的凋亡率。采用miR-135a inhibitor 质粒、对照pcDNA 空载体（SOX2-Con）质粒、pcDNA-SOX2（SOX2-OE）质粒共转染Hep-2 细胞，构建miR-135a inhibitor+SOX2-Con 组和miR-135a inhibitor+SOX2-OE组，检测此2 组细胞的增殖活性、集落形成能力、侵袭及迁移能力。结果：与癌旁组织比较，喉癌组织中miR-135a表达水平显著升高（P<0.01）；与正常NHP细胞比较，miR-135a 在Hep-2 细胞中表达水平明显上调（P<0.01）；转染miR-135a inhibitor导致Hep-2 细胞中miR-135a 表达水平明显降低（P<0.01）。敲降miR-135a 明显降低Hep-2 细胞的增殖活性、细胞集落数、迁移、侵袭和SOX2 表达（均P<0.01）；明显增强细胞对奥沙利铂敏感性（P<0.01）；与miR-135a inhibitor+SOX2-Con 组比较，miR-135a inhibitor+SOX2-OE 组的Hep-2 细胞的增殖活性、细胞集落数、迁移与侵袭能力均明显增加（均P<0.01）；同时，用不同浓度的奥沙利铂处理此2 组细胞，相对于miR-135a inhibitor+SOX2-Con组，miR-135a inhibitor+SOX2-OE组的Hep-2 细胞存活率显著升高（P<0.01）。结论：敲降miR-135a 可能通过下调转录因子SOX2 的表达抑制Hep-2 细胞的恶性生物学行为，并增强其对奥沙利铂的敏感性。

[Abstract] Objective: To investigate the effect of miR-135a on the malignant biological behaviors of human laryngeal carcinoma epithelial Hep-2 cells and its sensitivity to oxaliplatin. Methods: Samples of laryngeal carcinoma tissues and para-cancerous tissues were collected from 10 patients who underwent laryngectomy in Nanyang Hospital Affiliated to Zhengzhou University-Nanyang City Center Hospital from January 2018 to June 2018. The expression of miR-135a in laryngeal carcinoma tissues and Hep-2 cells was detected by qPCR. After being transfected with miR-135 inhibitor, cell proliferation viability of Hep-2 cells was measured by CCK-8 assay, cell colony formation ability was detected by colony formation assay, and cell proliferation invasion and migration abilities were detected by Transwell analysis, and the expression of SOX2 protein in Hep-2 cells was detected by WB. Hep-2 cells transfected with miR-135 in-hibitor were further treated with various concentrations (0.5, 1.0, 1.5 and 2.0 μmol/L) of oxaliplatin, and the cell proliferation viability was detected by CCK-8 while cell apoptosis was detected by Annexin-V-FITC/PI double staining flow cytometry. miR-135a inhibitor plasmid, control pcDNA empty vector (SOX2-Con) plasmid, and pcDNA-SOX2 (SOX2-OE) plasmid were transfected into Hep-2 cells to construct the miR-135a inhibitor+SOX2-Con group and miR-135a inhibitor+SOX2-OE group, and the cell viability, cell colony formation ability, cell invasion and migration ability in two groups were detected. Results: Compared with para-cancerous tissues, miR-135a expression in laryngeal cancer tissues was significantly increased (P<0.01). Compared with normal NHP cells, miR-135a expression in Hep-2 cells was significantly increased (P<0.01). miR-135a inhibitor significantly reduced the expression level of miR-135a in Hep-2 cells (P<0.01). miR-135a knockdown significantly reduced the cell proliferation viability, cell colony number, migration, invasion and SOX2 expression in Hep-2 cells (all P <0.01), but significantly enhanced the sensitivity of Hep-2 cells to oxaliplatin (P<0.01).Compared with miR-135a inhibitor+SOX2-Con group, the cell proliferation viability, cell colony number, migration and invasion of Hep-2 cells in miR-135a inhibitor+SOX2-OE group were significantly increased (P<0.01); Meanwhile, the cells of the 2 groups were treated with different concentrations of oxaliplatin, and the results of CCK-8 assay showed that, compared with the miR-135a inhibitor+ SOX2-Con group, the cell proliferation viability of Hep-2 cells in miR-135a inhibitor+SOX2-OE group was significantly increased (P<0.01). Conclusion: miR-135a knockdown inhibits the malignant biological behaviors and promotes oxaliplatin-sensitivity of Hep-2 cells possibly by inhibiting the expression of the transcription factor SOX2.

中国抗癌协会-齐鲁肿瘤研究基金资助项目(No.Y-Q201802-048)