Article Summary
王凡 卢锦华 何杰 张浩翔 张雅鸥.MiR-147a 通过抑制细胞自噬促进HIF-1alpha蛋白的积累[J].现代生物医学进展英文版,2017,17(2):201-204.
MiR-147a 通过抑制细胞自噬促进HIF-1alpha蛋白的积累
MiR-147a Increases the Accumulation of HIF-1alpha Proteinthrough Inhibiting Autophagy
  
DOI:
中文关键词: 细胞自噬  miR-147a  HIF-1-alpha
英文关键词: Autophagy  miR-147a  HIF-1-alpha
基金项目:深圳市科技计划项目(GJHZ20140416153718941)
Author NameAffiliation
王凡 卢锦华 何杰 张浩翔 张雅鸥 清华大学生命科学学院清华大学深圳研究生院深圳市坪山高级中学深圳南粤药业有限公司广州市第一人民医院消化内科 
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中文摘要:
      目的:HIF-1alpha是由低氧诱导表达的一个重要的调节肿瘤生长、代谢的转录因子,它的降解除了通过泛素- 蛋白酶体途径降解 之外还与可以通过细胞自噬途径降解。通过研究miR-147a 对细胞自噬的影响从而进一步研究miR-147a 对HIF-1alpha降解的影响。 方法:在HeLa 细胞中过表达miR-147a,用Western blot 和Q-PCR 检测细胞自噬相关的标志物LC3B、P62、LAMP-2A的变化。再 通过溶酶体- 自噬泡共定位实验共聚焦显微镜观察自噬泡的数量以及共定位情况。最后通过加入自噬诱导剂(EBSS)和自噬抑制 剂(Bafilomycin A1),用Western blot 检测转染NC 与miR-147a 后HIF-1alpha蛋白的表达情况。结果:过表达miR-147a 后自噬相关的 标志物LC3B、P62 表达量上升,LAMP-2A 表达量下降,且溶酶体与自噬泡的共定位增多;加入自噬诱导剂和自噬抑制剂后 HIF-1-alpha蛋白的表达量增加。结果表明miR-147a 可以抑制细胞自噬的巨自噬途径以及分子伴侣介导的自噬途径,积累HIF-1-alpha蛋 白。结论:miR-147a通过抑制细胞自噬从而减少HIF-1-alpha蛋白的降解,但是miR-147a 作用靶点的分子机制需要进一步研究。
英文摘要:
      Objective:HIF-1-alpha is an important hypoxia-induced factor which regulates tumor growth and metabolism. And its degradation is associated with autophagy. To further study the impact of miR-147a on HIF-1-alpha’degradation, we study the relationship between miR-147a and autophagy.Methods:MiR-147a was over-expressed in HeLa cells. Autophagy related markers, such as LC3B, P62 and LAMP-2A were detected by Western blot and Q-PCR. Next, we used confocal microscope to observe the numbers of autophagic vacuoles and its co-localization with lysosome. Finally, we performed Western blot to detect the protein level of HIF-1-alpha when HeLa cells were transfected with miR-147a and treated with autophagy inducer or autophagy inhibitor.Results:Autophagy related markers, such as LC3B, P62 and LAMP-2A were increased and the numbers of autophagic vacuoles and its co-localization with lysosome were raised. The protein level of HIF-1-alpha were increased when treated with autophagy inducer or autophagy inhibitor. All these experiments revealed that miR-147a could inhibit both macroautophagy and chaperone-mediated autophagy, thus reduced the degradation of HIF-1-alpha.Conclusion:In this paper, we found that miR-147a could inhibit autophagy and accelerated the accumulation of HIF-1-alpha through hindering the autophagy pathway of HIF-1-alpha degradation. But the targets of miR-147a needed further research.
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