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中国防痨杂志 ›› 2023, Vol. 45 ›› Issue (5): 464-471.doi: 10.19982/j.issn.1000-6621.20220532

• 论著 • 上一篇    下一篇

miR-99a-5p在结核分枝杆菌感染宿主巨噬细胞中的免疫调控作用

史雨婷1, 董静1, 贾红彦1, 朱传智1, 杨斌2, 李自慧1, 孙琦1, 杜博平1, 邢爱英1, 张宗德1, 潘丽萍1()   

  1. 1 首都医科大学附属北京胸科医院/北京市结核病胸部肿瘤研究所耐药结核病研究北京市重点实验室, 北京 101149
    2 首都医科大学附属北京胸科医院/北京市结核病胸部肿瘤研究所肿瘤研究中心, 北京 101149
  • 收稿日期:2023-01-15 出版日期:2023-05-10 发布日期:2023-04-25
  • 通信作者: 潘丽萍 E-mail:panliping2006@163.com
  • 基金资助:
    国家自然科学基金(81902024);国家自然科学基金(82172279);国家自然科学基金(82070012);北京市自然科学基金(7192038);北京市自然科学基金(7212012);通州区运河计划人才项目(YH201807);通州区运河计划人才项目(YH202001);北京市医院管理中心青年职工创新工作室-创新梦工场(202136)

The role of miR-99a-5p in the immune regulation of host macrophages infected by Mycobacterium tuberculosis

Shi Yuting1, Dong Jing1, Jia Hongyan1, Zhu Chuanzhi1, Yang Bin2, Li Zihui1, Sun Qi1, Du Boping1, Xing Aiying1, Zhang Zongde1, Pan Liping1()   

  1. 1 Beijing Key Laboratory for Drug Resistant Tuberculosis Research, Beijing Tuberculosis and Thoracic Tumor Research Institute,Beijing Chest Hospital, Capital Medical University, Beijing 101149,China
    2 Cancer Research Center, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing Chest Hospital, Capital Medical University, Beijing 101149,China
  • Received:2023-01-15 Online:2023-05-10 Published:2023-04-25
  • Contact: Pan Liping E-mail:panliping2006@163.com
  • Supported by:
    National Natural Science Foundation(81902024);National Natural Science Foundation(82172279);National Natural Science Foundation(82070012);Beijing Natural Science Foundation(7192038);Beijing Natural Science Foundation(7212012);Tongzhou Yunhe Project(YH201807);Tongzhou Yunhe Project(YH202001);Beijing Hospital Management Center Young Workers Innovation Studio-Innovation Dreamworks(202136)

摘要: 目的 初步探讨结核分枝杆菌(Mycobacterium tuberculosis, MTB)感染THP-1细胞内特异miRNA在宿主抗结核免疫中的作用。方法 提取MTB感染及未感染THP-1细胞RNA,基于Illumina NovaSeq6000二代测序平台检测THP-1细胞内miRNA表达谱。采集4名健康受试者6ml外周血并分离人原代巨噬细胞。应用实时荧光PCR(qRT-PCR)技术验证MTB感染THP-1细胞内特异miRNA并检测人原代巨噬细胞中靶标miRNA的表达水平。构建miRNA过表达载体,经慢病毒转染THP-1巨噬细胞获得稳定的过表达细胞株,使用qRT-PCR检测H37Rv感染的miRNA过表达细胞及对照空载体细胞中的肿瘤坏死因子α(TNF-α)及γ-干扰素(IFN-γ)表达水平。结果 从16个二代测序结果表达差异明显的miRNA分子中选取既往未作研究且差异最为明显的miR-99a-5p(P=0.021)作为研究靶基因。通过qRT-PCR在THP-1细胞及原代巨噬细胞中验证,发现miR-99a-5p在THP-1感染组和原代巨噬细胞内的表达量(分别为0.482±0.148和0.433±0.072)均明显低于未感染组(1.536±0.290和1.113±0.218),差异均有统计学意义(t=6.476,P<0.001;t=3.167, P=0.019)。MTB感染miR-99a-5p过表达细胞后24h的菌落形成单位(CFU)[64.0×104(52.0×104,87.0×104)]明显高于MTB感染的对照空载体细胞内CFU[17.0×104(16.0×104,24.0×104)],差异有统计学意义(Z=-2.323, P=0.029)。与MTB感染的对照空载体细胞相比,MTB感染的miR-99a-5p过表达细胞内TNF-α及IFN-γ的mRNA相对表达水平分别由1.018±0.310和1.687±0.135下降至0.740±0.001和0.631±0.374,差异均有统计学意义(t=4.631, P=0.010;t=3.349, P=0.010)。结论 miR-99a-5p可抑制TNF-α及IFN-γ的释放,促进MTB在巨噬细胞内的生长。MTB感染后宿主miR-99a-5p的下调表达可能在宿主抗结核感染免疫中发挥重要作用。

关键词: 分枝杆菌,结核, 芯片分析技术, 微RNAs, 巨噬细胞, 免疫调节

Abstract:

Objective: To explore the role of specific microRNA in THP-1 cells mediated host defense against Mycobacterium tuberculosis (MTB) infection. Methods: Total RNA were extracted from THP-1 cells with or without MTB (H37Rv) infection, and then the miRNA expression profiles in THP-1 cells with or without MTB infection were identified using Illumina NovaSeq6000 next-generation sequencing platform. Four health controls were recruited and the human monocyte-derived macrophage (hMDM) were separated. Validation of differentially expressed miRNA between MTB infected and uninfected THP-1 cells, as well as that between MTB infected and uninfected hMDM, were performed by quantitative real-time PCR (qRT-PCR). The miRNA overexpression vector was constructed and transfected into THP-1 macrophages by lentivirus. The expression level of tumor necrosis factor-α(TNF-α), interferon-γ(IFN-γ) and colony-forming unit (CFU) in H37Rv infected THP-1 cells which were transfected with miRNA overexpression vector or control empty vector was tested using qRT-PCR. Results: miR-99a-5p was selected as the study target gene (P=0.021) by not previously studied and most significantly different, from 16 miRNA molecules with significant expression differences in second-generation sequencing results. By qRT-PCR validation in THP-1 cells and primary macrophages, miR-99a-5p expression within THP-1 infected groups (0.482±0.148) and primary macrophages (0.433±0.072) were significantly lower than the uninfected group (1.536±0.290 and 1.113±0.218)(t=6.476,P<0.001; t=3.167,P=0.019). CFU results of the THP-1 cells infected by MTB showed that the intracellular bacteria amount of miR-99a-5p overexpression cells at 24 h after infection was 64.0×104 (52.0×104,87.0×104), which was significantly higher than that in the control cells (17.0×104 (16.0×104,24.0×104))(Z=-2.323, P=0.029). Furthermore, the expression levels of TNF-α and IFN-γ in MTB infected miR-99a-5p over expression cells were 1.018±0.310 and 1.687±0.135, which were significantly lower than TNF-α (0.740±0.001) and IFN-γ (0.631±0.374) those in the MTB infected control cells (t=4.631, P=0.010; t=3.349, P=0.010). Conclusion: miR-99a-5p can inhibit the release of TNF-α and IFN-γ, promote the growth of MTB in macrophages. Therefore, the decreased miR-99a-5p expression after MTB infection may play a protective role in host innate immunity against MTB infection.

Key words: Mycobacterium tuberculosis, Microarray technology, MicroRNAs, Macrophages, Immunomodulation

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