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2016 ; 20
(11
): 2064-2077
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Fluorofenidone attenuates pulmonary inflammation and fibrosis via inhibiting the
activation of NALP3 inflammasome and IL-1?/IL-1R1/MyD88/NF-?B pathway
#MMPMID27306439
Song C
; He L
; Zhang J
; Ma H
; Yuan X
; Hu G
; Tao L
; Zhang J
; Meng J
J Cell Mol Med
2016[Nov]; 20
(11
): 2064-2077
PMID27306439
show ga
Interleukin (IL)-1? plays an important role in the pathogenesis of idiopathic
pulmonary fibrosis. The production of IL-1? is dependent upon
caspase-1-containing multiprotein complexes called inflammasomes and
IL-1R1/MyD88/NF-?B pathway. In this study, we explored whether a potential
anti-fibrotic agent fluorofenidone (FD) exerts its anti-inflammatory and
anti-fibrotic effects through suppressing activation of NACHT, LRR and PYD
domains-containing protein 3 (NALP3) inflammasome and the
IL-1?/IL-1R1/MyD88/NF-?B pathway in vivo and in vitro. Male C57BL/6J mice were
intratracheally injected with Bleomycin (BLM) or saline. Fluorofenidone was
administered throughout the course of the experiment. Lung tissue sections were
stained with haemotoxylin and eosin and Masson's trichrome. Cytokines were
measured by ELISA, and ?-smooth muscle actin (?-SMA), fibronectin, collagen I,
caspase-1, IL-1R1, MyD88 were measured by Western blot and/or RT-PCR. The human
actue monocytic leukaemia cell line (THP-1) were incubated with monosodium urate
(MSU), with or without FD pre-treatment. The expression of caspase-1, IL-1?,
NALP3, apoptosis-associated speck-like protein containing (ASC) and pro-caspase-1
were measured by Western blot, the reactive oxygen species (ROS) generation was
detected using the Flow Cytometry, and the interaction of NALP3
inflammasome-associated molecules were measured by Co-immunoprecipitation.
RLE-6TN (rat lung epithelial-T-antigen negative) cells were incubated with IL-1?,
with or without FD pre-treatment. The expression of nuclear protein p65 was
measured by Western blot. Results showed that FD markedly reduced the expressions
of IL-1?, IL-6, monocyte chemotactic protein-1 (MCP-1), myeloperoxidase (MPO),
?-SMA, fibronectin, collagen I, caspase-1, IL-1R1 and MyD88 in mice lung tissues.
And FD inhibited MSU-induced the accumulation of ROS, blocked the interaction of
NALP3 inflammasome-associated molecules, decreased the level of caspase-1 and
IL-1? in THP-1 cells. Besides, FD inhibited IL-1?-induced the expression of
nuclear protein p65. This study demonstrated that FD, attenuates BLM-induced
pulmonary inflammation and fibrosis in mice via inhibiting the activation of
NALP3 inflammasome and the IL-1?/IL-1R1/MyD88/ NF-?B pathway.