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2017 ; 2017
(ä): 7171404
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Ginsenoside Rg1 Attenuates Cigarette Smoke-Induced Pulmonary
Epithelial-Mesenchymal Transition via Inhibition of the TGF-?1/Smad Pathway
#MMPMID29104873
Guan S
; Xu W
; Han F
; Gu W
; Song L
; Ye W
; Liu Q
; Guo X
Biomed Res Int
2017[]; 2017
(ä): 7171404
PMID29104873
show ga
Epithelial-mesenchymal transition (EMT) is a process associated with airway
remodeling in chronic obstructive pulmonary disease (COPD), which leads to
progressive pulmonary destruction. Panax ginseng is a traditional herbal medicine
that has been shown to improve pulmonary function and exercise capacity in
patients with COPD. Ginsenoside Rg1 is one of the main active components and was
shown to inhibit oxidative stress and inflammation. The present study
investigated the hypothesis that ginsenoside Rg1 attenuates EMT in COPD rats
induced by cigarette smoke (CS) and human bronchial epithelial (HBE) cells
exposed to cigarette smoke extract (CSE). Our data showed that CS or CSE exposure
increased expression of the mesenchymal marker ?-smooth muscle actin (?-SMA) and
decreased expression of the epithelial marker epithelial cadherin (E-cad) in both
lung tissues and HBE cells, which was markedly suppressed by ginsenoside Rg1.
Importantly, CS-induced upregulation of TGF-?1/Smad pathway components, including
TGF-?1, TGF-?R1, phospho-Smad2, and phospho-Smad3, was also inhibited by
ginsenoside Rg1. Additionally, ginsenoside Rg1 mimicked the effect of SB525334, a
TGF-?R1-Smad2/3 inhibitor, on suppression of EMT in CSE-induced HBE cells.
Collectively, we concluded that ginsenoside Rg1 alleviates CS-induced pulmonary
EMT, in both COPD rats and HBE cells, via inhibition of the TGF-?1/Smad pathway.