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2017 ; 8
(21
): 34223-34235
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gab.com Text
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English Wikipedia
Isoliquiritigenin suppresses human T Lymphocyte activation via covalently binding
cysteine 46 of I?B kinase
#MMPMID27626700
Yan F
; Yang F
; Wang R
; Yao XJ
; Bai L
; Zeng X
; Huang J
; Wong VKW
; Lam CWK
; Zhou H
; Su X
; Liu J
; Li T
; Liu L
Oncotarget
2017[May]; 8
(21
): 34223-34235
PMID27626700
show ga
The efficacious practice of precision personalized medicine requires a more exact
understanding of the molecular mechanisms of drug, hence then it is necessary to
identify the binding site of the drugs derived from natural sources. In the
study, we investigated the suppressive effect and underlying mechanism of
isoliquiritigenin (2',4',4-trihydroxychalcone; ILG), a phyto-flavonoid, on human
T lymphocyte activation in vitro and in vivo. The results showed that ILG
dose-dependently suppressed human T cell activation via suppressing I?B?
phosphorylation and degradation, NF-?B nuclear translocation and IKK? activity.
Molecular docking results predicted that cysteine 46 (Cys-46) is probably the
binding site of ILG on IKK?, and this prediction has been validated by
competition assay and kinase assay. To further verify the binding site of this
compound in vivo, IKK?C46A transgenic (IKK?C46A) mice were generated. We found
that ILG had a less potent immune-suppressive effect in homozygous IKK?C46A mice
than IKK? wild type (IKK? wt) littermates with the delay-type hypersensitivity
(DTH), suggesting that ILG cannot significantly suppress the inflammation due to
the mutation of Cys-46 in the transgenic mice. Collectively, our findings
indicate that the ILG inhibited T cell activation in vivo and in vitro via
directly binding to IKK? Cys46.