Inhibition of IFN-γ-Induced Nitric Oxide Dependent Antimycobacterial Activity by miR-155 and C/EBPß.
Int J Mol Sci
; 17(4): 535, 2016 Apr 08.
Article
en En
| MEDLINE
| ID: mdl-27070591
ABSTRACT
miR-155 (microRNA-155) is an important non-coding RNA in regulating host crucial biological regulators. However, its regulatory function in mycobacterium infection remains unclear. Our study demonstrates that miR-155 expression is significantly increased in macrophages after Mycobacterium marinum (M.m) infection. Transfection with anti-miR-155 enhances nitric oxide (NO) synthesis and decreases the mycobacterium burden, and vice versa, in interferon γ (IFN-γ) activated macrophages. More importantly, miR-155 can directly bind to the 3'UTR of CCAAT/enhancer binding protein ß (C/EBPß), a positive transcriptional regulator of nitric oxide synthase (NOS2), and regulate C/EBPß expression negatively. Knockdown of C/EBPß inhibit the production of nitric oxide synthase and promoted mycobacterium survival. Collectively, these data suggest that M.m-induced upregulation of miR-155 downregulated the expression of C/EBPß, thus decreasing the production of NO and promoting mycobacterium survival, which may provide an insight into the function of miRNA in subverting the host innate immune response by using mycobacterium for its own profit. Understanding how miRNAs partly regulate microbicidal mechanisms may represent an attractive way to control tuberculosis infectious.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Interferón gamma
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Proteína beta Potenciadora de Unión a CCAAT
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MicroARNs
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Mycobacterium
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Infecciones por Mycobacterium
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Óxido Nítrico
Límite:
Animals
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Humans
Idioma:
En
Revista:
Int J Mol Sci
Año:
2016
Tipo del documento:
Article
País de afiliación:
China