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Chinese Journal of Antituberculosis ›› 2023, Vol. 45 ›› Issue (8): 744-751.doi: 10.19982/j.issn.1000-6621.20230105

• Original Articles • Previous Articles     Next Articles

Impact of targeted regulation of miR-144-3p by LncRNA GAS5 on macrophage apoptosis and inflammatory response in Mycobacterium tuberculosis infected macrophages

Zhao Yong1(), Liang Lili2, Jiang Nan3   

  1. 1Department of Tuberculosis, Shangqiu Chest Hospital, Henan Province, Shangqiu 476005, China
    2Department of Internal Medicine-Tuberculosis, Henan Provincial Thoracic Hospital, Zhengzhou 450008, China
    3Department of Tuberculosis Surgery, Henan Provincial Thoracic Hospital, Zhengzhou 450008, China
  • Received:2023-03-30 Online:2023-08-10 Published:2023-08-09
  • Contact: Zhao Yong E-mail:zhaoyongjh@163.com
  • Supported by:
    Henan Province Medical Science and Technology Breakthrough Plan in 2019(SB201903027)

Abstract:

Objective: To investigate the impact of targeted regulation of miR-144-3p by long non-coding RNA growth arrest specific transcript 5 (LncRNA GAS5) on macrophage apoptosis and inflammatory response in Mycobacterium tuberculosis (MTB) infected macrophages. Methods: Serum LncRNA GAS5 and miR-144-3p levels were detected by qRT-PCR in 75 patients diagnosed with tuberculosis and 75 healthy subjects who visited Shangqiu Chest Hospital, Henan Province from March 31, 2019 to March 31, 2022. Macrophages (160 nmol/L adherent THP-1 cells induced by phoboester) were divided into 8 groups: MTB group, MTB+pcDNA group, MTB+pcDNA-GAS5 group, MTB+inhibitor NC group, MTB+miR-144-3p inhibitor group, MTB+pcDNA-GAS5+mimic NC group, MTB+pcDNA-GAS5+miR-144-3p mimic group, normal culture macrophages were selected as control group (NC group).The expressions of LncRNA GAS5 and miR-144-3p in macrophages were detected by qRT-PCR and inflammatory cytokines in cell supernatant were detected by ELISA. Macrophage proliferation and apoptosis were detected by CCK-8 and flow cytometry respectively, and the expressions of Bcl-2 associated X protein (Bax) and B-cell lymphoma-2 (Bcl-2) protein in macrophages were detected by Western Blot. The relationship between LncRNA GAS5 and miR-144-3p was verified (double luciferase reporter gene assay). Results: The average expression of LncRNA GAS5 in the serum of tuberculosis patients was 0.24±0.02, lower than that of the healthy group (1.00±0.00), and the expression of miR-144-3p was 2.35±0.12, higher than that of the healthy group (1.00±0.00), with statistical significance (t=329.090, 97.428, all P<0.001). LncRNA GAS5 expression in MTB group was 0.22±0.02, apoptosis capacity was (3.84±0.24) % and Bax protein expression was 0.22±0.02, all lower than that in the NC group (1.00±0.00, (9.79±0.23) %, 1.21±0.12). The expression of miR-144-3p (2.46±0.13), the inflammatory cytokine level (IFN-γ: (212.26±9.65) pg/ml; IL-6: (123.35±5.12) pg/ml; TNF-α: (325.58±12.28) pg/ml), the cell proliferation capacity (1.45±0.14) and Bcl-2 protein expression (1.53±0.15) were all higher than the NC group (1.00±0.00, (35.58±1.23) pg/ml, (25.46±1.18) pg/ml, (51.12±2.03) pg/ml, 0.86±0.07, 0.56±0.05), the differences were all statistically significant (q=41.205, 73.979, 36.403, 31.876, 61.384, 66.990, 81.580, 13.484, 22.943, all P<0.001). In MTB+pcDNA-GAS5 group, the expression of LncRNA GAS5 was 0.86±0.07, the apoptosis capacity was (7.62±0.17) % and the expression of Bax protein was 0.94±0.08, higher than that in the MTB+pcDNA group (0.23±0.01, (3.82±0.21) %, 0.23±0.01); the expression of miR-144-3p (1.35±0.10), and the inflammatory cytokine level (IFN-γ: (96.63±4.17) pg/ml; IL-6: (41.93±2.19) pg/ml; TNF-α: (118.85±6.03) pg/ml), cell proliferation capacity (0.96±0.08) and Bcl-2 protein expression (0.81±0.07) were all lower than that in the MTB+pcDNA group (2.48±0.14, (210.63±9.78) pg/ml, (125.52±4.86) pg/ml, (327.73±10.15) pg/ml, 1.44±0.13, 1.54±0.14), the differences were all statistically significant (q=33.281, 47.247, 26.107, 24.671, 57.204, 61.448, 62.087, 10.970, 17.266, all P<0.001). The apoptotic capacity of MTB+miR-144-3p inhibitor group was (7.51±0.19) % and the expression of Bax protein was 0.89±0.08, which were higher than that of MTB+inhibitor NC group ((3.86±0.22) %, 0.24±0.02). The expression of miR-144-3p (1.21±0.09), the inflammatory cytokine level (IFN-γ: (103.36±5.11) pg/ml; IL-6: (39.95±1.62) pg/ml; TNF-α: (120.26±6.67) pg/ml), cell proliferation capacity (0.92±0.08) and Bcl-2 protein expression (0.78±0.07) were all lower than that in the MTB+inhibitor NC group (2.47±0.12, (214.45±10.03) pg/ml, (126.05±4.77) pg/ml, (326.69±8.33) pg/ml, 1.46±0.12, 1.54±0.12), and all differences were statistically significant (q=45.382, 23.901, 27.509, 58.921, 61.029, 61.359, 12.341, 17.976, all P<0.001). Conclusion: Overexpression of LncRNA GAS5 might inhibit the inflammatory response of macrophages infected with MTB and induce apoptosis through targeted down-regulation of miR-144-3p.

Key words: RNA probe, Growth arrest specific transcript 5, Mycobacterium tuberculosis, Macrophages

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