Document Detail

Involvement of MAPKs and NF-kappaB in LPS-induced VCAM-1 expression in human tracheal smooth muscle cells.
MedLine Citation:
PMID:  17303384     Owner:  NLM     Status:  MEDLINE    
Lipopolysaccharide (LPS) has been shown to induce the expression of adhesion molecules on airway epithelial and smooth cells and contributes to inflammatory responses. Here, the roles of mitogen-activated protein kinases (MAPKs) and nuclear factor-kappaB (NF-kappaB) pathways for LPS-induced vascular cell adhesion molecule (VCAM)-1 expression were investigated in HTSMCs. LPS-induced expression of VCAM-1 protein and mRNA in a time-dependent manner, was significantly inhibited by inhibitors of MEK1/2 (U0126), p38 (SB202190), and c-Jun-N-terminal kinase (JNK; SP600125). The involvement of p42/p44 MAPK and p38 in these responses was further confirmed by that transfection with small interference RNAs (siRNA) direct against MEK, p42, and p38 significantly attenuated LPS-induced VCAM-1 expression. Consistently, LPS-stimulated phosphorylation of p42/p44 MAPK and p38 was attenuated by pretreatment with U0126 or SB202190, and transfection with these siRNAs, respectively. In addition, LPS-induced VCAM-1 expression was significantly blocked by a specific NF-kappaB inhibitor helenalin. LPS-stimulated translocation of NF-kappaB into the nucleus and degradation of IkappaB-alpha was blocked by helenalin, U0126, SB202190, or SP600125. Moreover, the resultant enhancement of VCAM-1 expression increased the adhesion of polymorphonuclear cells to monolayer of HTSMCs which was blocked by pretreatment with helenalin, U0126, or SP600125 prior to LPS exposure. Taken together, these results suggest that in HTSMCs, activation of p42/p44 MAPK, p38, and JNK pathways, at least in part, mediated through NF-kappaB, is essential for LPS-induced VCAM-1 gene expression. These results provide new insight into the mechanisms of LPS action that bacterial toxins may promote inflammatory responses in the airway disease.
Wei-Ning Lin; Shue-Fen Luo; Chiang-Wen Lee; Chien-Chun Wang; Jong-Shyan Wang; Chuen-Mao Yang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-01-19
Journal Detail:
Title:  Cellular signalling     Volume:  19     ISSN:  0898-6568     ISO Abbreviation:  Cell. Signal.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-04-20     Completed Date:  2007-07-24     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8904683     Medline TA:  Cell Signal     Country:  England    
Other Details:
Languages:  eng     Pagination:  1258-67     Citation Subset:  IM    
Department of Physiology and Pharmacology, Chang Gung University, Kwei-San, Tao-Yuan, Taiwan.
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MeSH Terms
Cell Adhesion / drug effects
Cells, Cultured
Enzyme Activation / drug effects
Gene Expression Regulation / drug effects
JNK Mitogen-Activated Protein Kinases / antagonists & inhibitors,  metabolism
Lipopolysaccharides / pharmacology*
Mitogen-Activated Protein Kinase 1 / antagonists & inhibitors,  metabolism
Mitogen-Activated Protein Kinase 3 / antagonists & inhibitors,  metabolism
Mitogen-Activated Protein Kinases / antagonists & inhibitors,  metabolism*
Myocytes, Smooth Muscle / cytology,  drug effects*,  enzymology*
NF-kappa B / antagonists & inhibitors,  metabolism*
Neutrophils / cytology,  drug effects
Phosphorylation / drug effects
Protein Kinase Inhibitors / pharmacology
RNA, Messenger / genetics,  metabolism
Trachea / cytology*,  drug effects,  enzymology
Vascular Cell Adhesion Molecule-1 / genetics*,  metabolism
p38 Mitogen-Activated Protein Kinases / antagonists & inhibitors,  metabolism
Reg. No./Substance:
0/Lipopolysaccharides; 0/NF-kappa B; 0/Protein Kinase Inhibitors; 0/RNA, Messenger; 0/Vascular Cell Adhesion Molecule-1; EC Mitogen-Activated Protein Kinases; EC Protein Kinase 1; EC Protein Kinase 3; EC Protein Kinases; EC Mitogen-Activated Protein Kinases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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