天津医药 ›› 2016, Vol. 44 ›› Issue (12): 1423-1427.doi: 10.11958/20160592

• 细胞与分子生物学 • 上一篇    下一篇

谷氨酰胺对小细胞肺癌H446细胞增殖和生存的影响

徐鹏育, 李家印, 苗亚静, 高翠翠, 沈尧, 靳芳, 仇晓菲△   

  1. 天津医科大学 (邮编 300070)
  • 收稿日期:2016-06-28 修回日期:2016-10-24 出版日期:2016-12-15 发布日期:2017-01-26
  • 通讯作者: 仇晓菲 △通讯作者 E-mail: qiouxf@tijmu.edu.cn E-mail:pengyu0309@163.com
  • 作者简介:徐鹏育 (1991), 女, 硕士在读, 主要从事肿瘤分子病理学研究
  • 基金资助:
    天津市应用基础与前沿技术研究计划重点项目 (14JCZDJC35500)

Glutamine regulates the proliferation and survival of small cell lung cancer H446 cells

XU Pengyu, LI Jiayin, MIAO Yajing, GAO Cuicui, SHEN Yao, JIN Fang, QIU Xiaofei △   

  1. Tianjin Medical University, Tianjin 300070,China
  • Received:2016-06-28 Revised:2016-10-24 Published:2016-12-15 Online:2017-01-26
  • Contact: QIU Xiaofei △Corresponding Author E-mail: qiouxf@tijmu.edu.cn E-mail:pengyu0309@163.com

摘要: 摘要: 目的 观察谷氨酰胺 (Gln) 对小细胞肺癌 H446 细胞增殖和生存的影响, 并探究其机制。方法 应用 CCK-8 试剂盒检测 Gln (+) 组和 Gln (-) 组 H446 细胞在 0、 24、 48、 72、 96 h 的增殖情况, 筛选出最佳时间, 采用 Annexin V-FITC/PI 双染法、 CellTiter-Glo®发光法和流式细胞仪分别检测这 2 组细胞的存活比例、 三磷酸腺苷 (ATP)和活性氧 (ROS) 水平; 以 Gln (-) 组为对照组, 实验组中加入草酰乙酸 (OAA) 或 α-酮戊二酸二甲酯 (DM-αKG), 检测各组 H446 细胞的 ATP 水平、 增殖和存活情况; 以 Gln (-) 组为对照组, 实验组中加入 ROS 清除剂 N-乙酰-L-半胱氨酸 (NAC), 检测 2 组细胞的 ROS 水平、 增殖、 克隆和存活情况; 在 Gln (+) 条件下, 用 0、 2、 5、 10 μmol/L 谷氨酰胺酶抑制剂 BPTES 处理 H446 细胞, 通过克隆实验筛选最佳作用浓度, 在此浓度下检测 Gln (+) 组和 Gln (+) +BPTES 组细胞的 ATP、 ROS 水平和增殖水平。最后, 单独应用 BPTES 或 ROS 诱导剂过氧化氢 (H2O2 ) 和二者联合应用情况下检测细胞的存活比例。结果 相比 Gln (+) 组, Gln (-) 组 H446 细胞的增殖水平在 24、 48、 72、 96 h 均降低 (P<0.05), 72 h 降低最明显, 取 72 h 为最佳时间; Gln (-) 组细胞的存活比例和 ATP 水平低于 Gln (+) 组 (P<0.05), ROS 水平高于 Gln (+) 组; 相比 Gln (-) 组, Gln (-) +OAA 组和 Gln (-) +DM-αKG 组 H446 细胞的 ATP 和增殖未升高, 而存活比例升高(P<0.05); 相比 Gln (-) 组, Gln (-) +NAC 组 ROS 水平降低, 增殖、 克隆水平和存活比例均升高 (均 P<0.05)。克隆实验结果显示 10 μmol/L BPTES 为最佳浓度; 相比 Gln (+) 组, Gln (+) +BPTES 组细胞的 ATP 和增殖降低 (均 P<0.05), ROS 水平升高; 相比单独应用, BPTES+H2O2 组 H446 细胞存活比例明显降低。结论 Gln 缺乏可通过提高 ROS 水平抑制H446细胞的增殖和生存; BPTES 和H2O2对 H446 细胞有联合杀伤作用。

关键词: 谷氨酰胺, 肺肿瘤, 癌, 小细胞, 腺苷三磷酸, 活性氧, 细胞增殖, 细胞存活

Abstract: Abstract: Objective To investigate the effects of glutamine (Gln) on proliferation and survival of small cell lung cancer H446 cells, and further to explore the potential mechanism. Methods The proliferation of H446 cells was detected at different time points (0, 24, 48, 72 and 96 h) by CCK-8 assay in Gln (+) group and Gln (-) group, and an optimal time was selected. Under the optimal time, Annexin V-FITC/PI staining, CellTiter-Glo® assay kit and flow cytometer were used to detect cell survival, cellular adenosine triphosphate (ATP) and reactive oxygen species (ROS) levels. Gln (-) group was used as the control group, under the condition of Gln deficiency, cellular ATP, cell proliferation and survival were detected after adding oxaloacetic acid (OAA) or dimethyl- α- ketoglutarate (DM- αKG). Gln (- ) group was used as the control group, cellular ROS, cell proliferation, colony and survival were detected after treated with ROS scavenger N- acetyl cysteine (NAC). With different concentrations (0, 2, 5, 10 μmol/L) of glutaminase inhibitor BPTES, the optimal concentration was selected through the colony assay. The cellular ATP and ROS levels and cell proliferation were detected under the optimal concentration. H446 cells were treated with bis-2-(5-phenylacetamido-1,2,4-thiadiazol-2-yl) ethyl sulfide (BPTES), ROS inducer hydrogen peroxide (H2O2) or the combination of them, and cell survival ratio was compared between two groups. Results The proliferation levels of H446 cells at 24, 48, which were decreased most significantly in 72 h in Gln (-) group. When 72 h was used as the optimal time, the cell survival ratio and ATP level were decreased, and the ROS level was increased, in Gln (-) group compared with those of Gln (+) group (P<0.05). There was a higher survival ratio in H446 cells in Gln (-)+OAA group and Gln (-) +DM-αKG group than that of Gln (-) group (P<0.05), but there were no significant differences in cell proliferation and ATP levels between Gln (-) group, Gln (-)+OAA group and Gln (-)+DM-αKG group. The ROS level was reduced, the cell proliferation, colony level and survival ratio were increased in Gln (-)+NAC group compared with those of Gln (-) group (P<0.05). Cloning assay showed that 10 μmol/L was the optional concentration. Under this concentration, the proliferation and ATP level were decreased in Gln(+)+BPTES group (P<0.05), and cellular ROS level was up- regulated compared with Gln(+ ) group. The survival ratio was significantly lower in BPTES + H2O2 group compared with BPTES (+) group or H2O2 (+) group. Conclusion Glutamine deficiency inhibits the proliferation and survival ratio of H446 cells through enhancing ROS level. BPTES and H2O2 show synergistically inhibitory effect on the survival of H446 cells.

Key words:  glutamine, lung neoplasms, carcinoma, small cell, adenosine triphosphate, reactive oxygen species, cell proliferation, cell survival