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Proc Natl Acad Sci U S A. 2016 Oct 11;113(41):E6172-E6181. Epub 2016 Sep 28.

MiR-155-regulated molecular network orchestrates cell fate in the innate and adaptive immune response to Mycobacterium tuberculosis.

Author information

1
Center for Infectious Disease Research, Seattle, WA 98109.
2
Institute for Systems Biology, Seattle, WA 98109.
3
Novo Nordisk Inflammation Research Center, Seattle, WA 98109.
4
CeMM Research Center for Molecular Medicine, Austrian Academy of Sciences, Vienna 1090, Austria.
5
Center for Infectious Disease Research, Seattle, WA 98109; alan.aderem@cidresearch.org.

Abstract

The regulation of host-pathogen interactions during Mycobacterium tuberculosis (Mtb) infection remains unresolved. MicroRNAs (miRNAs) are important regulators of the immune system, and so we used a systems biology approach to construct an miRNA regulatory network activated in macrophages during Mtb infection. Our network comprises 77 putative miRNAs that are associated with temporal gene expression signatures in macrophages early after Mtb infection. In this study, we demonstrate a dual role for one of these regulators, miR-155. On the one hand, miR-155 maintains the survival of Mtb-infected macrophages, thereby providing a niche favoring bacterial replication; on the other hand, miR-155 promotes the survival and function of Mtb-specific T cells, enabling an effective adaptive immune response. MiR-155-induced cell survival is mediated through the SH2 domain-containing inositol 5-phosphatase 1 (SHIP1)/protein kinase B (Akt) pathway. Thus, dual regulation of the same cell survival pathway in innate and adaptive immune cells leads to vastly different outcomes with respect to bacterial containment.

KEYWORDS:

Mycobacterium tuberculosis; T cell; macrophage; miR-155; microRNA

PMID:
27681624
PMCID:
PMC5068277
DOI:
10.1073/pnas.1608255113
[Indexed for MEDLINE]
Free PMC Article

Conflict of interest statement

The authors declare no conflict of interest.

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