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中国临床药理学与治疗学 ›› 2012, Vol. 17 ›› Issue (2): 121-125.

• 基础研究 •    下一篇

眼镜蛇毒L-氨基酸氧化酶诱导人胃癌细胞MGC-803细胞凋亡的实验研究

齐元麟1, 张明芳1,2, 赵蓉1, 林建银2   

  1. 1福建医科大学基础医学院分子医学研究中心,消化道恶性肿瘤教育部重点实验室,
    2福建医科大学生理学与病理生理学系,福州 350004,福建
  • 收稿日期:2011-11-17 修回日期:2012-01-15 出版日期:2012-02-26 发布日期:2012-03-12
  • 通讯作者: 林建银,男,教授,博士生导师,研究方向为肿瘤分子生物学。E-mail: jylin@mail.fjmu.edu.cn
  • 作者简介:齐元麟,男,博士,助理研究员,研究方向为肿瘤药理学。E-mail: yuanlin_qi@163.com
  • 基金资助:
    国家自然科学基金(30940062);福建医科大学青年科学基金(FJGXQ04011);福建省教育厅科技重点项目(JA10130)

Evidence of caspases-mediated human stomach carcinoma MGC-803 cells apoptosis induced by L-amino acid oxidase from Naja atra venom

QI Yuan-lin1, ZHANG Ming-fang1,2, ZHAO Rong1, LIN Jian-yin1   

  1. 1Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Research Center of Molecular Medicine, School of Basic Medical Sciences,
    2Department of Physiology and Pathophysiology, Fujian Medical University, Fuzhou 350004, Fujian, China
  • Received:2011-11-17 Revised:2012-01-15 Online:2012-02-26 Published:2012-03-12

摘要: 目的: 研究眼镜蛇毒L-氨基酸氧化酶(NA-LAAO)对人胃癌细胞MGC-803的细胞毒性、诱导凋亡作用及可能机制。方法: 采用CCK-8法测定细胞毒性;采用DNA倍体分析和Annexin V/碘化丙啶染色测定细胞凋亡;采用发色底物法测定Caspase-3酶活性;采用Western-blot方法测定聚二磷酸腺苷核糖多聚酸-1(PARP-1)切割。结果: NA-LAAO可抑制MGC-803细胞增殖,6、12、24 h 的IC50分别为(2.48±0.41) 、(1.74±0.27) 和(0.83±0.19) mg/L;NA-LAAO可使细胞DNA分布出现亚二倍体凋亡峰,并可促使细胞膜磷脂酰丝氨酸外翻;NA-LAAO可激活Caspase-3并可促使其底物PARP-1降解。结论: NA-LAAO可能通过激活Caspase-3这一分子机制而诱导细胞凋亡,从而抑制肿瘤细胞增殖。

关键词: 蛇毒, 中华眼镜蛇, L-氨基酸氧化酶, 细胞增殖, 细胞凋亡

Abstract: AIM: To investigate the effects and the molecular mechanisms of Naja atra L-amino acid oxidase (NA-LAAO) on the proliferation and cell apoptosis of human stomach cancer MGC-803 cells.METHODS: MGC-803 cells were exposed to different concentrations of NA-LAAO and the cytotoxicity was measured using a CCK-8 kit. The apoptosis-inducing activities of NA-LAAO were examined by propidium iodide staining and Annexin V/PI assay in flow cytometry. The enzyme activity of caspase-3 was measured by a colorimetric assay. The cleavage of PARP-1 was analyzed by Western-blot.RESULTS: NA-LAAO exhibited cytotoxicity on MGC-803 in a dose- and time-dependent manner. The half maximal inhibitory concentration (IC50) values of NA-LAAO were (2.48±0.41), (1.74±0.27) and (0.83±0.19) mg/L in MGC-803 cells at 6 h, 12 h and 24 h, respectively. NA-LAAO induced apoptosis accompanied DNA hypodiploidy, phosphatidylserine exposure, activation of caspase-3, and PARP cleavage.CONCLUSION: NA-LAAO inhibited cell proliferation by inducing a caspase-mediated cell apoptosis.

Key words: Snake venoms, Naja atra, L-amino acid oxidase, Cell proliferation, Apoptosis

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