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MicroRNA-199a Inhibits Cellular Autophagy and Downregulates IFN-? Expression by Targeting TBK1 in Mycobacterium bovis Infected Cells.


ABSTRACT: The mechanism by which microRNAs (miRNAs) modulate innate immunity and autophagy has not been fully elucidated in Mycobacterium bovis (M. bovis) infections. In this study, we identified that miR-199a inhibited key innate immune responses and autophagy in murine macrophages infected with M. bovis. Using ex vivo and in vitro approaches we show that the expression of miR-199a was significantly increased during M. bovis infection. Furthermore, miR-199a suppressed autophagy and interferon-? (IFN-?) production by directly targeting TANK-binding kinase 1 (TBK1) mRNA in both J774a.1 and BMDM cells. Upregulation of miR-199a or TBK1 silencing (siTBK1) inhibited maturation of autophagosomes and increased M. bovis survival. Our results demonstrate that, by targeting of TBK1, miR-199a modulates innate immune responses and promote the intracellular survival and growth of M. bovis.

SUBMITTER: Wang J 

PROVIDER: S-EPMC6048223 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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MicroRNA-199a Inhibits Cellular Autophagy and Downregulates IFN-β Expression by Targeting TBK1 in <i>Mycobacterium bovis</i> Infected Cells.

Wang Jie J   Hussain Tariq T   Yue Ruichao R   Liao Yi Y   Li Qiang Q   Yao Jiao J   Song Yinjuan Y   Sun Xin X   Wang Nan N   Xu Lei L   Sreevatsan Srinand S   Zhao Deming D   Zhou Xiangmei X  

Frontiers in cellular and infection microbiology 20180710


The mechanism by which microRNAs (miRNAs) modulate innate immunity and autophagy has not been fully elucidated in <i>Mycobacterium bovis</i> (<i>M. bovis</i>) infections. In this study, we identified that miR-199a inhibited key innate immune responses and autophagy in murine macrophages infected with <i>M. bovis</i>. Using <i>ex vivo</i> and <i>in vitro</i> approaches we show that the expression of miR-199a was significantly increased during <i>M. bovis</i> infection. Furthermore, miR-199a suppr  ...[more]

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