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2017 ; 12
(10
): e0186639
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Treatment with the NR4A1 agonist cytosporone B controls influenza virus infection
and improves pulmonary function in infected mice
#MMPMID29053748
Egarnes B
; Blanchet MR
; Gosselin J
PLoS One
2017[]; 12
(10
): e0186639
PMID29053748
show ga
The transcription factor NR4A1 has emerged as a pivotal regulator of the
inflammatory response and immune homeostasis. Although contribution of NR4A1 in
the innate immune response has been demonstrated, its role in host defense
against viral infection remains to be investigated. In the present study, we show
that administration of cytosporone B (Csn-B), a specific agonist of NR4A1, to
mice infected with influenza virus (IAV) reduces lung viral loads and improves
pulmonary function. Our results demonstrate that administration of Csn-B to naive
mice leads to a modest production of type 1 IFN. However, in IAV-infected mice,
such production of IFNs is markedly increased following treatment with Csn-B. Our
study also reveals that alveolar macrophages (AMs) appear to have a significant
role in Csn-B effects, since selective depletion of AMs with clodronate liposome
correlates with a marked reduction of IFN production, viral clearance and
morbidity in IAV-infected mice. Furthermore, when reemergence of AMs is observed
following clodronate liposome administration, an increased production of IFNs was
detected in bronchoalveolar fluids of IAV-infected mice treated with Csn-B,
supporting the contribution of AMs in Csn-B effects. While treatment of mice with
Csn-B induces phosphorylation of transcriptional factors IRF3 and IRF7, the
latter appears to be less indispensable since effects of Csn-B treatment on the
synthesis of IFNs were slightly affected in IAV-infected mice lacking functional
IRF7. Together, our results highlight the capacity of Csn-B and consequently of
NR4A1 transcription factor in controlling IAV infection.
|Animals
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Influenza, Human/physiopathology/*prevention & control
[MESH]
|Interferon Type I/biosynthesis
[MESH]
|Lung/*physiopathology
[MESH]
|Mice
[MESH]
|Mice, Inbred C57BL
[MESH]
|Nuclear Receptor Subfamily 4, Group A, Member 1/*agonists
[MESH]