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2015 ; 57
(2
): 105-12
Nephropedia Template TP
gab.com Text
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English Wikipedia
Wogonin, a plant flavone from Scutellariae radix, attenuated ovalbumin-induced
airway inflammation in mouse model of asthma via the suppression of IL-4/STAT6
signaling
#MMPMID26388667
Ryu EK
; Kim TH
; Jang EJ
; Choi YS
; Kim ST
; Hahm KB
; Lee HJ
J Clin Biochem Nutr
2015[Sep]; 57
(2
): 105-12
PMID26388667
show ga
Bronchial asthma is a chronic inflammatory disease of the airways characterized
by a marked infiltration of eosinophils at the site of inflammation. Eotaxins are
potent chemoattractants for eosinophils and play important roles in pathogenesis
of asthma. In the course of screening for eotaxin-3 inhibitors, we found that
wogonin showed potent inhibitory activity of interleukin-4 (IL-4)-induced
eotaxin-3 expression in BEAS-2B cells. In this study, we examined the effects of
wogonin on IL-4/STAT6 signaling pathway and biological implication in a mouse
model of asthma. Wogonin inhibited IL-4-induced activation and nuclear
translocation of STAT6 which plays a key role in either the transcription of
STAT6-response genes or Th2 cytokine-mediated inflammation. Oral administration
of wogonin significantly reduced activation of STAT6 in the lung and the
expression of eotaxin and RANTES in bronchoalveolar lavage fluids. Histological
examination of lung tissue demonstrated that wogonin significantly inhibited
allergen-induced eosinophilic inflammation. Administration of wogonin reduced the
total IgE and ovalbumin-specific IgE levels compared with the
ovalbumin-challenged group. All of these data demonstrated that wogonin could
alleviate airway inflammation through inhibition of STAT6 activation induced by
Th2 cytokines. Our finding implicates a potential therapeutic value of wogonin in
the treatment of asthma through regulation of IL-4/STAT6 signaling pathway.