目的：探讨Ig 样结构域 2 黏附分子（adhesion molecule with Ig like domain 2，AMIGO2）在鼻咽癌（nasopharyngeal carcinoma，NPC）细胞增殖中的作用及其机制。方法: 选用2017年9月至11月福建省肿瘤医院收集的10例NPC组织和10例正常鼻 咽黏膜上皮组织标本，以及NPC细胞系CNE-1、CNE-2、SUNE-1、 6-10B、 C666-1和人永生化鼻咽黏膜上皮细胞株NP69， 用qPCR法 检测NPC组织和细胞中AMIGO2 mRNA的表达。构建慢病毒载体干扰AMIGO2表达， 用qPCR法验证其干扰效率； 用CCK-8 法、克隆形成及流式细胞术检测干扰AMIGO2表达对NPC细胞增殖、克隆形成和凋亡的影响， 用 Western blotting 检测干扰 AMIGO2 表达对 NPC 细胞增殖及 PI3K/AKT/mTOR 信号通路相关标志蛋白表达的影响。结果: AMIGO2在NPC组织和 CNE-2和SUNE-1细胞中高表达（均P<0.01）。慢病毒AMIGO2感染后，CNE-2和SUNE-1细胞的AMIGO2干扰效率均达50%以 上。干扰AMIGO2表达，显著降低CNE-2和SUNE-1细胞增殖及克隆形成能力（均P<0.01）、明显提高细胞的凋亡率（均P<0.01）； 降低 SUNE-1 细胞中PI3K、AKT和mTOR磷酸化蛋白的表达水平 （均P<0.01）、下调survivin 和 PCNA 蛋白的表达水平（均P<0.01）。 结论：AMIGO2通过激活PI3K/AKT/mTOR信号通路促进NPC细胞增殖并抑制其凋亡，提示AMIGO2可能是NPC治疗的潜 在靶点。

Objective: To explore the role of adhesion molecule with Ig like domain 2 (AMIGO2) in the proliferation of nasopharyngeal carcinoma (NPC) cells and its mechanisms. Methods: A total of 10 NPC tissue samples and 10 normal nasopharyngeal epithelial tissue samples collected at Fujian Cancer Hospital during September 2017 and November 2017 were used for this study; in addition, NPC cell lines (CNE-1, CNE-2, SUNE-1, 6-10B, C666-1) and human immobilized nasopharyngeal epithelial cell line NP69 were also collected. The relative expressionofAMIGO2mRNAinabovementionedtissuesandcelllineswasdetectedby qPCR. Lentivirus vectors were constructed to interfere AMIGO2 mRNA expression, and qPCR was used to verify its interference efficiency. CCK-8 method, Clonal formation and Flow cytometry were performed to evaluate the effect of AMIGO2 interference on proliferation, clone formation and apoptosis of NPC cells. The influence ofAMIGO2 interference on PI3K/AKT/mTOR signaling pathway and proliferation related molecular markers in NPC cells was assessed by Western blotting. Results: The results of qPCR showed that AMIGO2 was highly expressed in NPC tissues, CNE-2, and SUNE-1 cells (all P<0.01). The interference efficiency of AMIGO2 in CNE-2 and SUNE-1 cells could reach over 50%. The interfering of AMIGO2 expression significantly inhibited the proliferation and clone formation of CNE-2 and SUNE-1 cells (all P<0.01), promoted cell apoptosis (all P<0.01), reduced the phosphorylated protein expression levels of PI3K, AKT and mTOR in SUNE-1 cells (all P<0.01), as well as down-regulated the protein expressions of survivin and PCNA (all P<0.01). Conclusion: AMIGO2 may promote the proliferation as well as inhibit apoptosis of NPC cells by activating the PI3K/AKT/mTOR signaling pathway, suggesting thatAMIGO2 may be a potential target for NPC therapy.

福建省医学创新课题资助项目（No.2018-CX-11）；福建省自然科学基金资助项目（No.2019J01201）；福建省科技计划资助项目 （No.2018Y2003）