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2018 ; 15
(6
): 8711-8716
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Asiatic acid prevents the development of interstitial lung disease in a
hypochlorous acid-induced mouse model of scleroderma
#MMPMID29805609
Xia X
; Dai C
; Yu H
; Huang X
; Chen A
; Tan Y
; Wang L
Oncol Lett
2018[Jun]; 15
(6
): 8711-8716
PMID29805609
show ga
Interstitial lung disease is the most common complication of systemic sclerosis
(SSc) and is associated with a high rate of mortality. Due to the complex
pathogenesis of SSc, the therapies currently available remain limited. In the
present study, the effect of asiatic acid (AA) on SSc-associated pulmonary
fibrosis (PF) and its association with the transforming growth factor-?1
(TGF-?1)/Smad2/3 signaling pathway were evaluated. A hypochlorous acid
(HOCl)-induced model of SSc was used to evaluate the therapeutic effect of AA on
PF in SSc, where AA was administered to SSc mice by gavage. PF was alleviated in
the AA-treated SSc mice groups when examined under light microscopy. In addition,
there was a decrease in histopathological progression and collagen in the lungs.
AA significantly reduced expression of type I collagen in the lungs of mice with
SSc. It also significantly suppressed ?-smooth muscle actin expression, which
attenuated the conversion of fibroblasts into muscle fibroblasts. These
AA-associated antifibrosis and anti-immune effects were mediated through the
significant downregulation of advanced oxidation protein product, E-selectin, and
anti-DNA topoisomerase-1 autoantibody levels in the serum. Furthermore, the
expression levels of TGF-?1 and the phosphorylated-Smad2/3/Smad2/3 ratios in
AA-treated SSc mice were similar to the control. The presence of pulmonary
inflammation and fibrosis was confirmed in the HOCl-induced SSc mice and the
results demonstrated that selective inhibition of reactive oxygen species
prevented PF. By focusing on the classical TGF-?1/Smad2/3 signaling pathway, a
mechanism of action of AA was identified to be associated with the inhibition of
Smad2/3 activation through negative regulation of Smad2/3 phosphorylation.