中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (13): 2051-2056.doi: 10.3969/j.issn.2095-4344.0504

• 肿瘤干细胞 cancer stem cells • 上一篇    下一篇

miRNA-520a-3p调控MAP3K2表达对肺癌干细胞凋亡的影响

鄢 俊1,钟志宏2,施华球1   

  1. 1赣南医学院第一附属医院肿瘤科,江西省赣州市 341000;2赣南医学院农村(社区)医学教育研究中心,江西省赣州市 341000
  • 修回日期:2018-03-29 出版日期:2018-05-08 发布日期:2018-05-08
  • 通讯作者: 施华球,硕士,副主任医师,副教授,赣南医学院第一附属医院肿瘤科,江西省赣州市 341000
  • 作者简介:鄢俊,男,1979年生,江西省德兴市人,2009年南昌大学医学院毕业,硕士,主治医师,讲师,主要从事肿瘤学方面的研究。
  • 基金资助:

    江西省卫生厅科技计划课题(20143129)

MicroRNA-520a-3p induces apoptosis in lung cancer stem cells via modulation of MAP3K2

Yan Jun1, Zhong Zhi-hong2, Shi Hua-qiu1   

  1. 1Department of Oncology, First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, Jiangxi Province, China; 2Rural (Community) Medical Education Research Center, Gannan Medical University, Ganzhou 341000, Jiangxi Province, China
  • Revised:2018-03-29 Online:2018-05-08 Published:2018-05-08
  • Contact: Shi Hua-qiu, Master, Associate chief physician, Associate professor, Department of Oncology, First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, Jiangxi Province, China
  • About author:Yan Jun, Master, Attending physician, Lecturer, Department of Oncology, First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, Jiangxi Province, China
  • Supported by:

    the Scientific Plan of Jiangxi Health Department, No. 20143129

摘要:

文章快速阅读:

文题释义:
微小RNA (microRNAs,miRNAs):
是一类长度18-22个核苷酸的非编码小RNA分子,miRNAs异常表达与疾病发生密切相关,miRNAs参与多种细胞生理过程,如增殖、分化、侵袭、迁移和凋亡等。随着对肿瘤干细胞相关miRNAs的深入研究,其在维持肿瘤干细胞的干细胞特性中发挥重要的调控作用。
肺癌干细胞:又称肿瘤起始细胞,是一类能不断自我更新的未分化的肿瘤细胞,具有极强的致瘤性,参与肿瘤的癌变及恶性进展等各个过程。近年来的研究认为,肿瘤干细胞与肿瘤发生、复发等密切相关,靶向抑制肿瘤干细胞是根治肿瘤的很有潜力的研究方向。 

 

摘要
背景:
有研究证实,miRNA-520a-3p在肺癌干细胞中有一定调节作用,但具体功能和作用机制尚不明确。
目的:探索miRNA-520a-3p对肺癌干细胞凋亡的影响,并对其作用机制进行初步研究。  
方法:采用免疫磁珠法从肺腺癌细胞株A549中分离出CD133+肺癌干细胞。实时荧光定量PCR检测miRNA- 520a-3p在CD133+肺癌干细胞中的表达。采用脂质体转染法增加CD133+肺癌干细胞中miRNA-520a-3p表达水平,流式细胞术检测过表达miRNA-520a-3p对CD133+肺癌干细胞凋亡的影响。双荧光素酶报告基因实验检测miRNA-520a-3p对MAP3K2基因的调控作用。Western Blotting检测过表达miRNA-520a-3p对CD133+肺癌干细胞中MAP3K2,Bcl-2和Caspase-3 蛋白表达的影响。
结果与结论:①在CD133+肺癌干细胞中,miRNA-520a-3p表达水平显著低于CD133-肺癌细胞(P < 0.05);②过表达miRNA-520a-3p后,显著增加了CD133+肺癌干细胞凋亡百分比(P < 0.05);③抑制miRNA-520a-3p表达能够显著增强含有MAP3K2基因3’-非翻译区(3’-UTR)报告质粒的荧光素酶活性(P < 0.05),增加miRNA-520a-3p表达能够显著降低含有MAP3K2基因3’-UTR报告质粒的荧光素酶活性(P < 0.05);④过表达miRNA-520a-3p后,CD133+肺癌干细胞中MAP3K2,Bcl-2蛋白表达降低(P< 0.05),而Caspase-3蛋白表达增加(P < 0.05);⑤结果表明,在CD133+肺癌干细胞中,miRNA-520a-3p呈低表达状态。miRNA- 520a-3p可能通过调控MAP3K2基因表达,诱导CD133+肺癌干细胞凋亡。

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程
ORCID:
0000-0001-5797-1594(鄢俊)

关键词: miRNA-520a-3p, 肺癌, 肿瘤干细胞, CD133, MAP3K2, 细胞凋亡, 干细胞

Abstract:

BACKGROUND: Studies have confirmed that microRNA (miR)-520a-3p has a regulatory role in lung cancer stem cells, but the specific function and mechanism of action are still unknown.
OBJECTIVE: To investigate the influence of miR-520a-3p on the apoptosis of lung cancer stem cells, and to explore the underlying mechanism. 
METHODS: The magnetic activated cell sorting method was utilized to separate the CD133+ lung cancer stem cells from the lung cancer A549 cell line. The expression of miR-520a-3p in the lung cancer stem cells was determined by the real-time PCR assay. Liposome transfection assay was used to up-regulate the miR-520a-3p expression level in the lung cancer stem cells, and flow cytometry assay was applied to detect the influence of miR-520a-3p expression on the apoptosis of the lung cancer stem cells. Moreover, the modulation of MAP3K2 gene by the miR-520a-3p was analyzed by the dual-luciferase reporter gene assay, and the influence of miR-520a-3p expression on the protein expression of MAP3K2, Bcl-2 and Caspase-3 was analyzed by western blot assay. 
RESULTS AND CONCLUSION: The real-time PCR showed that the expression level of miR-520a-3p in CD133+ lung cancer stem cells was significantly lower than that in the CD133- lung cancer cells (P < 0.05). Overexpression of miR-520a-3p significantly increased the apoptotic rate of CD133+ lung cancer stem cells (P < 0.05). The dual-luciferase reporter gene assay results suggested that inhibition of miRNA-520a-3p could increase the luciferase activity of the reporter plasmids containing the 3’-untranslated region (3’-UTR) of MAP3K2 gene (P < 0.05), and overexpression of miR-520a-3p could decrease the luciferase activity of the reporter plasmids containing the 3’-UTR of MAP3K2 gene (P < 0.05). Moreover, miR-520a-3p overexpression also decreased the protein levels of MAP3K2 and Bcl-2 in the CD133+ lung cancer stem cells, P < 0.05), and increased the Caspase-3 protein level (P < 0.05). To conclude, in the lung cancer stem cells, miR-520a-3p was in a low-expressed status. miR-520a-3p could inhibit the expression of MAP3K2 gene, thereby inducing the cell apoptosis.

中国组织工程研究杂志出版内容重点:干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程

Key words: Lung Neoplasms, Neoplastic Stem Cells, MAP Kinase Kinase Kinase 2, Apoptosis, Tissue Engineering

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