American Journal of Translational Research | |
Live Mycobacterium leprae inhibits autophagy and apoptosis of infected macrophages and prevents engulfment of host cell by phagocytes | |
Jie Lu1  Yuelong Ma2  Qin Pei3  Li Zhang4  | |
[1] DICAT Biomedical Computation Centre, British Columbia, Canada;Institute of Photomedicine, Shanghai Skin Disease Hospital, Tongji University School of Medicine, Shanghai 200443, China;Shiping County Peoples Hospital, Yunnan 662200, China;Yunnan Center for Disease Control and Prevention, Yunnan 650022, China | |
关键词: Apoptosis; macrophage; Mycobacterium leprae; | |
DOI : | |
学科分类:医学(综合) | |
来源: e-Century Publishing Corporation | |
【 摘 要 】
Previous studies demonstrated that live Mycobacterium leprae (M. leprae) infection promoted macrophage differentiation toward the M2 type, with elevated interleukin (IL)-10 production. The underlying mechanism is not entirely clear. In this study, we treated macrophages with primary M. leprae strains isolated from both lepromatous leprosy (L-lep) and tuberculoid leprosy (T-lep) patients. We found that infection by live M. leprae, regardless of the primary strain, resulted in M2 skewing in the infected macrophage. This skewing was associated with downregulated IRGM expression, a core organizer protein in the autophagy assembly and reduced autophagosome formation, and with lower annexin V staining and lower caspase 3 and caspase 9 activity. Moreover, live M. leprae-infected macrophages prevented efficient phagocytosis by uninfected bystander macrophages. As a result, the phagocytes secreted less pro-inflammatory cytokines, and preferentially primed anti-inflammatory T cell responses. Together, these results suggested that live M. leprae could employ a strain-independent mechanism to suppress inflammation, possibly involving the inhibition of autophagy and apoptosis in the infected macrophages.
【 授权许可】
CC BY-NC
【 预 览 】
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