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2018 ; 9
(ä): 1611
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IL-1-IL-17 Signaling Axis Contributes to Fibrosis and Inflammation in Two
Different Murine Models of Systemic Sclerosis
#MMPMID30042768
Park MJ
; Moon SJ
; Lee EJ
; Jung KA
; Kim EK
; Kim DS
; Lee JH
; Kwok SK
; Min JK
; Park SH
; Cho ML
Front Immunol
2018[]; 9
(ä): 1611
PMID30042768
show ga
OBJECTIVE: Systemic sclerosis (SSc) is a progressive fibrotic disease that
affects the skin and internal organs. Despite evidence implicating increased
interleukin-17 (IL-17) activity in SSc, the role of IL-17 in SSc remains
uncertain. The purpose of this study was to investigate whether IL-17 plays a
pathophysiological role in SSc in two different murine models of SSc. METHODS:
Bleomycin (BLM)-induced fibrosis and chronic graft-versus-host disease (cGVHD)
models were used. Histological analysis was performed using Masson's trichrome
and immunohistochemical staining. Quantitative reverse transcription-polymerase
chain reaction and enzyme-linked immunoassays were used to quantify the messenger
RNA and protein levels of inflammatory mediators in dermal fibroblasts. RESULTS:
IL-1 receptor antagonist-deficient (IL-1Ra-KO) mice were more severely affected
by BLM injection, as shown by dermal and pulmonary fibrosis, compared with
wild-type (WT) mice. Increased tissue fibrosis was reversed by knocking down
IL-17. In vitro experiments showed that IL-1 and IL-17 exerted synergistic
effects on the expression of profibrotic and inflammatory mediators. In the cGVHD
model, C57BL/6 mice receiving splenocytes of IL-1Ra-KO BALB/c mice developed more
severe cGVHD than did those receiving cells from WT mice. Knockdown of IL-17 in
IL-1Ra-KO donor mice significantly attenuated the IL-1-induced acceleration of
cGVHD severity. CONCLUSION: Targeting IL-1 and its downstream IL-17 activity may
be a novel treatment strategy for inhibiting inflammation and tissue fibrosis in
SSc.