基础医学与临床 ›› 2018, Vol. 38 ›› Issue (4): 522-526.

• 研究论文 • 上一篇    下一篇

低氧对人结肠癌细胞自噬相关分子表达的影响

刘雅婷,李鑫,王娜,宋飞雪   

  1. 兰州大学第二医院
  • 收稿日期:2017-02-23 修回日期:2017-05-24 出版日期:2018-04-05 发布日期:2018-03-27
  • 通讯作者: 宋飞雪 E-mail:13639336037@139.com

Effects of hypoxia on expression of autophagy-related molecules in human colon cancer cells

  • Received:2017-02-23 Revised:2017-05-24 Online:2018-04-05 Published:2018-03-27

摘要: 目的 为探索低氧对SW480细胞自噬影响的分子机制。方法 免疫磁珠分选筛选出具有干细胞特性的CD133+细胞,将SW480细胞和CD133+在低氧环境中进行培养,免疫荧光检测HIF-1α表达,Western blot检测LC3的表达,用免疫组化检测94例结直肠癌组织中HIF-2α和Beclin1的表达。结果 低氧可诱导SW480细胞内HIF-1α的表达激活。低氧时,SW480细胞与CD133+细胞内LC3的表达量均在增加,并具有时间依赖性,但是CD133+细胞中LC3Ⅰ向LCⅡ的转化不断增加,而SW480细胞内这种转化却不断减弱。在结直肠癌组织当中,HIF-2α和Beclin1在低分化组中的表达量均高于高分化组(P<0.05),但HIF-2α表达量在淋巴无转移组中高于淋巴转移组(P<0.05),Beclin1表达量在淋巴转移组中高于淋巴无转移组(P<0.05),在Duke、s分期的A-B期中低于C-D(P<0.01)。结论 低氧可通过诱导HIF在SW480细胞中的表达,并提高LC3的表达,使大部分SW480细胞发生凋亡,但可使一小部分CD133+细胞发生自噬,保护CD133+细胞免于凋亡。

关键词: 低氧, 自噬, HIF, LC3, CD133+

Abstract: Objective To explore the mechanism of hypoxia on SW480 cell autophagy.Methods We screened the CD133+ cell with the characteristics of stem cell by magnetic cell separation. Then the SW480 cell and CD133+ cell were cultivated under hypoxic conditions. Subsequently, we detected the HIF-1α expression by immunofluorescence (IF), LC3 expression by western blot and HIF-2α and Beclin 1 expression in 94 colon cancer tissue samples by immunohistochemistry. Results The results showed that hypoxia induced the activation of HIF-1α in SW480 cell. After hypoxia 24 h, compared with the normal, the LC3 expression was increased in both SW480 cell and CD133+ cell and increased as the processing time increased. The conversion from LC3Ⅰto LC3Ⅱwas increased in CD133+ cell, but decreased in SW480 cell. In olon cancer tissue samples, HIF-2α and Beclin 1 expression in poorly differentiated group were higher than well-differentiated group.HIF-2α expression in no lymph node metastasis group was higher than high lymphatic metastasis group. However the Beclin expression was in the opposite regulation. Conclusion Hypoxia can induce the SW480 apoptosis and a few of CD133+ cell autophagy that can protect the cell from apoptosis by inducing the HIF expression and increasing LC3.

Key words: hypoxia, autophagy, HIF, LC3, CD133+

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