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2016 ; 6
(ä): 26554
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Honokiol suppresses TNF-?-induced neutrophil adhesion on cerebral endothelial
cells by disrupting polyubiquitination and degradation of I?B?
#MMPMID27212040
Chen PJ
; Wang YL
; Kuo LM
; Lin CF
; Chen CY
; Tsai YF
; Shen JJ
; Hwang TL
Sci Rep
2016[May]; 6
(ä): 26554
PMID27212040
show ga
Adhesion molecules expressed on cerebral endothelial cells (ECs) mediate
leukocyte recruitment and play a significant role in cerebral inflammation.
Increased levels of adhesion molecules on the EC surface induce leukocyte
infiltration into inflammatory areas and are thus hallmarkers of inflammation.
Honokiol, isolated from the Chinese medicinal herb Magnolia officinalis, has
various pharmacological activities, including anti-inflammatory effects, yet the
nature of honokiol targeting molecules remains to be revealed. Here, we
investigated the inhibitory effect of honokiol on neutrophil adhesion and
vascular cell adhesion molecule-1 (VCAM-1) expression, which underlie its
molecular target, and mechanisms for inactivating nuclear factor ? enhancer
binding protein (NF-?B) in mouse cerebral ECs. Honokiol inhibited tumour necrosis
factor-? (TNF-?)-induced neutrophil adhesion and VCAM-1 gene expression in
cerebral ECs. The inflammatory transcription factor NF-?B was downregulated by
honokiol. Honokiol significantly blocked TNF-?-induced NF-?B p65 nuclear
translocation and degradation of the proteasome-dependent inhibitor of NF-?B ?
(I?B?). From docking model prediction, honokiol directly targeted the
ubiquitin-ubiquitin interface of Lys48-linked polychains. Moreover, honokiol
prevented the TNF-?-induced Lys48-linked polyubiquitination, including
I?B?-polyubiquitin interaction. Honokiol has protective anti-inflammatory effects
on TNF-?-induced neutrophil adhesion and VCAM-1 gene expression in cerebral ECs,
at least in part by directly inhibiting ubiquitination-mediated I?B? degradation
and then preventing NF-?B nuclear translocation.