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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Toxicol+Sci
2016 ; 151
(1
): 126-38
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MCPIP1 Regulates Alveolar Macrophage Apoptosis and Pulmonary Fibroblast
Activation After in vitro Exposure to Silica
#MMPMID26865670
Wang X
; Zhang Y
; Zhang W
; Liu H
; Zhou Z
; Dai X
; Cheng Y
; Fang S
; Zhang Y
; Yao H
; Chao J
Toxicol Sci
2016[May]; 151
(1
): 126-38
PMID26865670
show ga
BACKGROUND: Silicosis is a fatal and fibrotic pulmonary disease caused by the
inhalation of silica. After arriving at the alveoli, silica is ingested by
alveolar macrophages (AMOs), in which monocyte chemotactic protein-induced
protein 1 (MCPIP1) plays an essential role in controlling macrophage-mediated
inflammatory responses. However, the mechanism of action of MCPIP1 in silicosis
is poorly understood. METHODS: Primary rat AMOs were isolated and treated with
SiO2 (50 µg/cm(2)). MCPIP1 and AMO activation/apoptosis markers were detected by
immunoblotting. MCPIP1 was down-regulated using siRNA in AMOs. The effects of
AMOs on fibroblast activation and migration were evaluated using a gel
contraction assay, a scratch assay, and a nested collagen matrix migration model.
RESULTS: After exposure to SiO2, MCPIP1 was significantly increased in rat AMOs.
Activation and apoptosis markers in AMOs were up-regulated after exposure to SiO2
Following siRNA-mediated silencing of MCPIP1 mRNA, the markers of AMO activation
and apoptosis were significantly decreased. Rat pulmonary fibroblasts (PFBs)
cultured in conditional medium from AMOs treated with MCPIP1 siRNA and SiO2
showed significantly less activation and migration compared with those cultured
in conditional medium from AMOs treated with control siRNA and SiO2 CONCLUSION:
Our data suggest a vital role for MCPIP1 in AMO apoptosis and PFB
activation/migration induced by SiO2.