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2016 ; 7
(51
): 83893-83906
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Arctigenin functions as a selective agonist of estrogen receptor ? to restrict
mTORC1 activation and consequent Th17 differentiation
#MMPMID27863380
Wu X
; Tong B
; Yang Y
; Luo J
; Yuan X
; Wei Z
; Yue M
; Xia Y
; Dai Y
Oncotarget
2016[Dec]; 7
(51
): 83893-83906
PMID27863380
show ga
Arctigenin was previously proven to inhibit Th17 cell differentiation and thereby
attenuate colitis in mice by down-regulating the activation of mechanistic target
of rapamycin complex 1 (mTORC1). The present study was performed to address its
underlying mechanism in view of estrogen receptor (ER). The specific antagonist
PHTPP or siRNA of ER? largely diminished the inhibitory effect of arctigenin on
the mTORC1 activation in T cell lines and primary CD4+ T cells under
Th17-polarization condition, suggesting that arctigenin functioned in an
ER?-dependent manner. Moreover, arctigenin was recognized to be an agonist of
ER?, which could bind to ER? with a moderate affinity, promote dissociation of
ER?/HSP90 complex and nuclear translocation and phosphorylation of ER?, and
increase the transcription activity. Following activation of ER?, arctigenin
inhibited the activity of mTORC1 by disruption of ER?-raptor-mTOR complex
assembly. Deficiency of ER? markedly abolished arctigenin-mediated inhibition of
Th17 cell differentiation. In colitis mice, the activation of ER?, inhibition of
mTORC1 activation and Th17 response by arctigenin were abolished by PHTPP
treatment. In conclusion, ER? might be the target protein of arctigenin
responsible for inhibition of mTORC1 activation and resultant prevention of Th17
cell differentiation and colitis development.
|Animals
[MESH]
|Cell Differentiation/*drug effects
[MESH]
|Colitis/chemically induced/enzymology/metabolism/*prevention & control
[MESH]