miR-207调控结核分枝杆菌在巨噬细胞内存活的机制研究
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大理大学基础医学院微生物学与免疫学教研室,云南 大理 671000

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R-33


Mechanistic study of miR-207 regulation of Mycobacterium tuberculosis survival in macrophages
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Department of Microbiology and Immunology, School of Basic Medical Sciences, Dali University, Dali 671000, China

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    摘要:

    目的 miR-207在许多疾病中存在差异性表达,探究miR-207过表达对调控结核分枝杆菌(H37Ra)在巨噬细胞内存活的机制研究,为结核病的靶向治疗提供理论基础。 方法 将实验分为4组:空白组(Ana-1细胞)、对照组(感染H37Ra的细胞)、mi组(感染H37Ra并转染miRNA-207 mimics)和mi-NC组(感染H37Ra并转染mimics NC)。使用H37Ra感染Ana-1细胞建立结核感染模型,使用脂质体转染法将miRNA-207 mimics和mimics NC转入Ana-1细胞。结核菌落形成单位计数评估miR-207对胞内分枝杆菌负荷的影响以及对胞外残留分枝杆菌的清除作用。采用流式细胞术检测细胞总凋亡率。实时荧光定量聚合酶链反应(qPCR)检测miR-207、细胞凋亡基因、焦亡基因、炎症基因及自噬基因相对表达量。Western blot检测细胞凋亡蛋白、焦亡蛋白、自噬蛋白的相对表达量。采用荧光显微镜及多功能酶标仪检测细胞内ROS的荧光强度,以及检测细胞内LDH的含量。 结果 显微镜下观察成功建立感染模型,qPCR检测发现对照组miR-207表达量低于空白组(P<0.01),表明miR-207在空白组和对照组中差异性表达,mi组miR-207表达量显著高于mi-NC组(P<0.0001),表明成功建立转染模型。菌落形成单位计数发现mi组的菌落数高于mi-NC组和对照组(P<0.001)。流式细胞术检测发现mi组总凋亡高于mi-NC组和对照组(P<0.05)。qPCR及Western blot检测发现对照组凋亡基因和凋亡蛋白相对表达量高于空白组(P<0.05), mi组高于mi-NC组(P<0.05)。对照组炎症基因相对表达量高于空白组(P<0.001),mi组高于mi-NC组(P< 0.05),对照组焦亡基因和焦亡蛋白相对表达量高于空白组(P<0.01),mi组高于mi-NC组(P<0.05)。自噬正调节基因LC3和Beclin1在对照组的相对表达量高于空白组(P<0.0001),mi组低于mi-NC组(P<0.05)。负调节自噬基因相对表达量与自噬正调节基因趋势相反。自噬相关蛋白相对表达量与自噬基因趋势一致。ROS荧光强度检测发现对照组的荧光强度高于空白组(P<0.05),mi组高于mi-NC组(P<0.001)。LDH检测发现对照组细胞内LDH含量高于空白组(P<0.01),mi组与mi-NC组含量无统计学意义(P>0.05)。 结论 miR-207过表达促进细胞凋亡、细胞焦亡及炎症、抑制自噬,有利于H37Ra的存活,为结核病的治疗提供新的方向。

    Abstract:

    Objective miR-207 is differentially expressed in many diseases. We investigated the mechanism by which miR-207 overexpression regulates the survival of Mycobacterium tuberculosis (H37Ra) in macrophages, to provide a theoretical basis for the targeted therapy of tuberculosis. Methods Macrophages were divided into four groups: blank (Ana-1 cells), control (cells infected with H37Ra), mi (infected with H37Ra and transfected with miRNA-207 mimics), and mi-NC (infected with H37Ra and transfected with NC mimics) groups. A model of tuberculosis infection was established using H37Ra-infected Ana-1 cells, and miRNA-207 and NC mimics were transfected into Ana-1 cells using the liposome transfection method. Tuberculosis colony-forming units were counted to assess the effect of miR-207 on intracellular mycobacterial load and clearance of extracellular residual mycobacteria. The total apoptosis rate was detected by flow cytometry. The relative expression levels of miR-207 and apoptosis, pyroptosis, inflammation, and autophagy genes were measured by quantitative real-time polymerase chain reaction (qPCR). Relative expression levels of apoptosis, pyroptosis, and autophagy proteins were detected by Western blot. Fluorescence microscopy and multifunctional enzyme labeling were used to detect the fluorescence intensity of intracellular reactive oxygen species (ROS) and lactate dehydrogenase (LDH). Results Successful establishment of the infection model was observed under the microscope. qPCR showed that miR-207 expression was lower in the control compared with the blank group(P<0.01), indicating differential expression between these two groups. miR-207 expression was significantly higher in the mi compared with the mi-NC group(P<0.0001), indicating successful establishment of the transfection model. The number of colonies and total apoptosis were both higher in the mi group compared with the mi-NC and control groups(P<0.001). qPCR and Western blot showed that the relative expression levels of apoptotic genes and proteins were higher in the control group than in the blank group(P<0.05), and higher in the mi group than in the mi-NC group(P<0.05). The relative expression levels of inflammatory genes were higher in the control than in the blank group(P<0.001). The relative expression levels of inflammatory genes were higher in the mi group than in the mi-NC group(P<0.05), and the relative expression levels of pyroptosis genes and proteins were higher in the control group compared with the blank group(P<0.01) and higher in the mi group compared with the mi-NC group(P<0.05). The relative expression levels of the autophagy positively-regulated genes LC3 and Beclin1 were higher in the control compared with the blank group(P<0.0001), and lower in the mi than in the mi-NC group(P<0.05), while negatively-regulated autophagy genes showed the opposite trend. Autophagy-related proteins showed similar trends to the autophagy genes. ROS fluorescence intensity was higher in the control compared with the blank group(P<0.05), and higher in the mi compared with the mi-NC group(P<0.001). LDH content was higher in the control than in the blank group(P<0.01), but there was no significant difference between the mi and mi-NC groups(P>0.05). Conclusions miR-207 overexpression promotes apoptosis, cellular pyroptosis, and inflammation, inhibits autophagy, and favors H37Ra survival. These result provide a potential new direction for the treatment of tuberculosis.

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杜文雅,代禹美,乐林芝,马 涛,吴利先. miR-207调控结核分枝杆菌在巨噬细胞内存活的机制研究[J].中国比较医学杂志,2024,34(12):41~49.

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  • 收稿日期:2024-07-18
  • 在线发布日期: 2025-03-05
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