中国农业科学 ›› 2024, Vol. 57 ›› Issue (8): 1606-1619.doi: 10.3864/j.issn.0578-1752.2024.08.014

• 畜牧·兽医 • 上一篇    下一篇

lincRNA Cox2通过miR-129-5p/AMPK调控BCG感染的巨噬细胞糖酵解进程

徐蕾(), 于嘉霖, 刘莉, 邓光存, 吴晓玲()   

  1. 宁夏大学生命科学学院/西部特色生物资源保护与利用教育部重点实验室,银川 750021
  • 收稿日期:2023-10-27 接受日期:2024-01-31 出版日期:2024-04-16 发布日期:2024-04-24
  • 通信作者:
    徐蕾,E-mail:
    吴晓玲,E-mail:
  • 基金资助:
    国家自然科学基金(32060160); 国家自然科学基金(32160162); 宁夏自然科学基金重点项目(2023AAC02015)

lincRNA Cox2 Regulates BCG-infected Macrophages Glycolysis by miR-129-5p/AMPK

XU Lei(), YU JiaLin, LIU Li, DENG GuangCun, WU XiaoLing()   

  1. School of Life Sciences, Ningxia University/Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Yinchuan 750021
  • Received:2023-10-27 Accepted:2024-01-31 Published:2024-04-16 Online:2024-04-24

摘要:

【目的】探究lincRNA Cox2对BCG(Bacillus Calmette-Guérin)感染的RAW264.7巨噬细胞糖酵解进程的调控作用,阐明Mtb与巨噬细胞之间的相互作用,为结核病的诊断和治疗提供新的靶点。【方法】利用小干扰RNA敲减lincRNA Cox2的表达,以及使用miR-129-5p mimics过表达载体,结合BCG感染,通过实时荧光定量PCR检测lincRNA Cox2、miR-129-5p和促炎因子IL-1β、TNF-α、IL-6的表达量;乳酸含量检测试剂盒检测乳酸(LD)的分泌情况;平板涂布法检测巨噬细胞菌载量情况;双荧光素酶报告基因系统验证lincRNA Cox2与miR-129-5p以及miR-129-5p与AMPK的互作关系;蛋白免疫印迹检测AMPK(AMP依赖蛋白激酶)及糖酵解途径中关键基因HK1(己糖激酶1)、PKM2(丙酮酸激酶2)和LDHA(乳酸脱氢酶)的表达变化。【结果】 BCG感染12 h能够极显著上调RAW264.7巨噬细胞中lincRNA Cox2的表达(P =0.000013),与BCG组相比,siRNA+BCG组中AMPK(P =0.000771)、HK1(P =0.00323)、PKM2(P =0.000135)和LDHA(P =0.002532)的表达量以及乳酸的分泌量(P =0.020802)发生显著上调,而促炎因子IL-1β(P=0.000451)、TNF-α(P=0.000147)、IL-6(P =0.0001)的表达发生显著下调,菌载量试验表明siRNA+BCG组中的巨噬细胞菌载量显著下调(P =0.000127)。双荧光素酶报告基因系统表明lincRNA Cox2和miR-129-5p存在相互作用关系并以AMPK为靶基因。BCG感染RAW264.7巨噬细胞12 h后极显著下调miR-129-5p的表达(P =0.000156),与BCG组相比,miR-129-5p mimics+BCG组中AMPK(P=0.000262)、HK1(P =0.019524)、PKM2(P=0.001658)和LDHA(P =0.000887)表达量以及乳酸分泌量(P =0.044952)发生显著下调。【结论】 lincRNA Cox2通过海绵吸附miR-129-5p并靶向AMPK,促进BCG感染的RAW264.7巨噬细胞糖酵解进程。

关键词: lincRNA Cox2, miR-129-5p, AMPK, BCG, 巨噬细胞, 糖酵解进程

Abstract:

【Objective】 The aim of this study was to investigate the regulatory role of lincRNA Cox2 in the glycolysis of RAW264.7 macrophages infected by Bacillus Calmette-Guerin (BCG), and to elucidate the interaction between Mtb and macrophages, so as to provide a new target for the diagnosis and treatment of tuberculosis. 【Method】 RNA interference technique was used to knock down the expression of lincRNA Cox2, and miR-129-5p mimics were used to overexpress miR-129-5p. QPCR was performed to measure the lincRNA Cox2, miR-129-5p and proinflammatory cytokine ( IL-1β, TNF-α, and IL-6 ) expression after BCG infection. The expression of Lactic Acid was detected by Lactic Acid assay kit. The bacterial load was measured bacterial load in BCG-infected macrophages. Dual luciferase reporter gene system validation experiments were carried out on lincRNA Cox2 and miR-129-5p, or miR-129-5p and AMPK relationships. The expression of AMPK (AMP activated protein kinase), HK1 (Hexokinase 1), PKM2 (pyruvate kinase M2), and LDHA (Lactate dehydrogenase A) were detected by Western blotting. 【Result】 The expression of lincRNA Cox2 was significantly upregulated (P=0.000013) after BCG infection in RAW264.7 macrophages for 12 h. Compared with the BCG group, the siRNA+BCG group had significantly upregulated the expression of AMPK (P=0.000771), HK1 (P=0.00323), PKM2 (P=0.000135), LDHA (P=0.002532), and the secretion of LD (P=0.020802), but the expression of IL-1β (P=0.000451), TNF-α (P=0.000147), IL-6 (P=0.0001) was significantly reduced. The lincRNA Cox2 knockdown caused a significant reduce of bacterial load in BCG-infected macrophages (P=0.000127). Dual luciferase reporter gene system were performed to the co-localized of lincRNA Cox2 and miR-129-5p, and targeting AMPK. The expression of miR-129-5p was significantly reduced (P=0.000156) after BCG infection in RAW264.7 macrophages for 12 h. Compared with the BCG group, the miR-129-5p mimics+BCG group had significantly reduced the expression of AMPK (P=0.000262), HK1 (P=0.019524), PKM2 (P=0.001658), LDHA (P=0.000887), and the secretion of LD (P=0.044952). 【Conclusion】 lincRNA Cox2 promoted BCG-infected RAW264.7 macrophages glycolysis process by sponging miR-129-5p and targeting AMPK.

Key words: lincRNA Cox2, miR-129-5p, AMPK, BCG, macrophages, glycolysis