microRNA-17-5p Modulates Bacille Calmette-Guerin Growth in RAW264.7 Cells by Targeting ULK1 |
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| Authors: | Xiangguo Duan Tao Zhang Shuqin Ding Jun Wei Chunxia Su Hongpeng Liu Guangxian Xu |
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| Affiliation: | 1. School of LaboratoryMedicine, Ningxia Medical University, Yinchuan, 750004, China.; 2. General Hospital of Ningxia Medical University, Yinchuan, 750004, China.; 3. Ningxia Key Laboratory of Clinical and Pathogenic Microbiology, Yinchuan, 750004, China.; 4. Taian City Central Hospital,Taian City, Shandong Province, 271000, China.; University of Saarland Medical School, GERMANY, |
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| Abstract: | To explore the potential roles of miRNAs in controlling the survival of mycobacteria in macrophages, miR-17-5p in the regulation of Bacillus Calmette-Guérin(BCG)growth in the macrophage RAW264.7 cells was interrogated. Our results reveal that an infection of BCG shows a time-dependent up-regulation of miR-17-5p in RAW264.7 cells in early phase; importantly, excessive expression of miR-17-5p in these cells exhibits an increased propagation of intracellular BCG. Mechanistically, the Unc-51 like autophagy activating kinase 1 (ULK1), an initial molecular of autophagy are identified as novel target of miR-17-5p, the miR-17-5p is capable of targeting down-regulating the expression of ULK1 protein. In addition, an overexpression of miR-17-5p in RAW264.7 cells is correlated with repression of ULK1 and the autophagosome related proteins LC3I/II. These results imply that miR-17-5p may be able to arrest the maturation of mycobacterial phagosomes in part by targeting ULK1, subsequently reduces the ability of host cells to kill intracellular BCG. |
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