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2015 ; 5
(ä): 16900
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p53/PUMA expression in human pulmonary fibroblasts mediates cell activation and
migration in silicosis
#MMPMID26576741
Wang W
; Liu H
; Dai X
; Fang S
; Wang X
; Zhang Y
; Yao H
; Zhang X
; Chao J
Sci Rep
2015[Nov]; 5
(ä): 16900
PMID26576741
show ga
Phagocytosis of SiO2 into the lung causes an inflammatory cascade that results in
fibroblast proliferation and migration, followed by fibrosis. Clinical evidence
has indicated that the activation of alveolar macrophages by SiO2 produces rapid
and sustained inflammation characterized by the generation of monocyte
chemotactic protein 1, which, in turn, induces fibrosis. However, the details of
events downstream of monocyte chemotactic protein 1 activity in pulmonary
fibroblasts remain unclear. Here, to elucidate the role of p53 in fibrosis
induced by silica, both the upstream molecular mechanisms and the functional
effects on cell proliferation and migration were investigated. Experiments using
primary cultured adult human pulmonary fibroblasts led to the following results:
1) SiO2 treatment resulted in a rapid and sustained increase in p53 and PUMA
protein levels; 2) the MAPK and PI3K pathways were involved in the SiO2-induced
alteration of p53 and PUMA expression; and 3) RNA interference targeting p53 and
PUMA prevented the SiO2-induced increases in fibroblast activation and migration.
Our study elucidated a link between SiO2-induced p53/PUMA expression in
fibroblasts and cell migration, thereby providing novel insight into the
potential use of p53/PUMA in the development of novel therapeutic strategies for
silicosis treatment.