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2017 ; 28
(1
): 201-209
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HMGB1 translocation and release mediate cigarette smoke-induced pulmonary
inflammation in mice through a TLR4/MyD88-dependent signaling pathway
#MMPMID27807045
Cheng Y
; Wang D
; Wang B
; Li H
; Xiong J
; Xu S
; Chen Q
; Tao K
; Yang X
; Zhu Y
; He S
Mol Biol Cell
2017[Jan]; 28
(1
): 201-209
PMID27807045
show ga
We performed studies to determine the role of high-mobility group box 1 (HMGB1)
in cigarette smoke (CS)-induced pulmonary inflammation. After mice were exposed
to five cigarettes four times a day for 3 d, toll-like receptor 4 (TLR4)
expression and TLR4-mediated signaling were significantly up-regulated, and HMGB1
had translocated from the nucleus to the cytoplasm in lung epithelial cells and
then been released into the extracellular lung space. On CS exposure,
inflammatory cell recruitment and proinflammatory cytokine production were
significantly increased in lung tissue and bronchoalveolar lavage, and these
effects depended on the TLR4 signaling pathway. HMGB1 inhibition decreased the
CS-induced inflammatory response, whereas treatment with exogenous HMGB1
aggravated the damage and increased the phosphorylation of JNK, p38, and I?B? in
the lungs of wild-type mice but not in TLR4-knockout mice. Blockade of TLR4
action or TLR4 knockout significantly inhibited HMGB1-induced proinflammatory
cytokine production in mouse tracheal epithelial (MTE) cells and lung tissues. In
addition, a MyD88 deficiency inhibited JNK, p38, and I?B? phosphorylation, and
this effect was associated with the suppressed production of TNF-? and IL-1? in
MTE cells and lung tissues in response to CS stimulation. Thus HMGB1 activates
the NF-?B and JNK/p38 pathways through TLR4/MyD88-dependent signaling and induces
an inflammatory response in lungs exposed to CS.