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2016 ; 24
(5
): 915-25
Nephropedia Template TP
gab.com Text
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English Wikipedia
Chop Deficiency Protects Mice Against Bleomycin-induced Pulmonary Fibrosis by
Attenuating M2 Macrophage Production
#MMPMID26883801
Yao Y
; Wang Y
; Zhang Z
; He L
; Zhu J
; Zhang M
; He X
; Cheng Z
; Ao Q
; Cao Y
; Yang P
; Su Y
; Zhao J
; Zhang S
; Yu Q
; Ning Q
; Xiang X
; Xiong W
; Wang CY
; Xu Y
Mol Ther
2016[May]; 24
(5
): 915-25
PMID26883801
show ga
C/EBP homologous protein (Chop) has been shown to have altered expression in
patients with idiopathic pulmonary fibrosis (IPF), but its exact role in IPF
pathoaetiology has not been fully addressed. Studies conducted in patients with
IPF and Chop(-/-) mice have dissected the role of Chop and endoplasmic reticulum
(ER) stress in pulmonary fibrosis pathogenesis. The effect of Chop deficiency on
macrophage polarization and related signalling pathways were investigated to
identify the underlying mechanisms. Patients with IPF and mice with bleomycin
(BLM)-induced pulmonary fibrosis were affected by the altered Chop expression and
ER stress. In particular, Chop deficiency protected mice against BLM-induced lung
injury and fibrosis. Loss of Chop significantly attenuated transforming growth
factor ? (TGF-?) production and reduced M2 macrophage infiltration in the lung
following BLM induction. Mechanistic studies showed that Chop deficiency
repressed the M2 program in macrophages, which then attenuated TGF-? secretion.
Specifically, loss of Chop promoted the expression of suppressors of cytokine
signaling 1 and suppressors of cytokine signaling 3, and through which Chop
deficiency repressed signal transducer and activator of transcription
6/peroxisome proliferator-activated receptor gamma signaling, the essential
pathway for the M2 program in macrophages. Together, our data support the idea
that Chop and ER stress are implicated in IPF pathoaetiology, involving at least
the induction and differentiation of M2 macrophages.
|Aged
[MESH]
|Animals
[MESH]
|Bleomycin/*adverse effects
[MESH]
|Cell Differentiation
[MESH]
|Disease Models, Animal
[MESH]
|Endoplasmic Reticulum Stress
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Macrophages/*metabolism
[MESH]
|Male
[MESH]
|Mice
[MESH]
|Middle Aged
[MESH]
|Pulmonary Fibrosis/chemically induced/genetics/*prevention & control
[MESH]