目的: 探究长链非编码RNA牛磺酸上调基因1（long non-coding RNA taurine up-regulated gene 1，lncRNA TUG1）在胃癌组织中的表达及其对胃癌细胞增殖和凋亡的影响。方法: 收集2016 年3 月至2017 年12 月在江西省赣州市人民医院行胃部手术的病理检查确诊胃癌患者40 例，取患者胃部肿瘤组织及其相应癌旁组织（距肿瘤边缘>2 cm处），用qPCR检测胃癌组织标本和胃癌AGS细胞中lncRNA TUG1 表达水平。向AGS细胞中转染lncRNA TUG1 过表达质粒和TUG siRNA，借助CCK-8、qPCR 和流式细胞术检测lncRNA TUG1 对胃癌细胞增殖和凋亡的影响。结果: 胃癌组织中lncRNA TUG1 表达水平显著高于癌旁组织，其与性别、年龄、肿瘤大小、肿瘤浸润程度、淋巴转移、肿瘤分化程度和TNM分期等因素均不相关。过表达lncRNA TUG1 显著抑制AGS胃癌细胞中CDKN1A、BAX和Caspase-3 表达、减少G1 期细胞比例和增加S期细胞比例、提高细胞增殖活力、降低细胞凋亡率；而干扰敲减lncRNA则显著促进细胞中CDKN1A、BAX和Caspase-3 表达、增加G1 期细胞比例和减少S期细胞比例、降低细胞增殖活力、升高细胞凋亡率。结论：胃癌组织中高表达的lncRNA TUG1 促进胃癌细胞增殖而抑制细胞凋亡。

Objective: To investigate the expression of lncRNA TUG1 (long non-coding RNA taurine up-regulated gene 1) in gastric cancer and its effect on the proliferation and apoptosis of gastric cancer cells. Methods: Surgically resected gastric cancer tissues and corresponding distal normal tissues (>5 cm away from the margin of tumor) of 40 gastric cancer patients from March 2016 to December 2017 at Ganzhou People's Hospital of Jiangxi Province were collected, and qPCR was used to examine the expression of lncRNA TUG1. AGS gastric cancer cells were transfected with lncRNA TUG1 over-expression plasmids and siRNAs, and the effects of lncRNA TUG1 on cell proliferation and apoptosis were assessed by CCK-8, qPCR and Flow cytometry. Results: lncRNA TUG1 expression was significantly increased in gastric cancer tissues as compared to normal tissues; and it was not correlated with gender, age, tumor size, infiltration depth of tumor, lymph node-metastasis, tumor differentiation and TNM staging. TUG1 over-expression significantly suppressed the expressions of CDKN1A, BAX and Caspase-3 in AGS gastric cancer cells, and decreased G1 phase proportion and apoptosis rate, but increased S phase proportion and cell viability; in contrast, TUG1 siRNA transfection significantly promoted the expressions of CDKN1A, BAX and Caspase-3, and increased G1 phase proportion and apoptosis rate, but decreased S phase proportion and cell viability. Conclusion: Up-regulated lncRNA TUG1 promotes proliferation and inhibits apoptosis of gastric cancer cells.

江西省卫计委科技计划资助项目（No.20167202）