Linked Life Data

15681696

Source:http://linkedlifedata.com/resource/pubmed/id/15681696

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2005-5-17
pubmed:abstractText
IL-6, a proinflammatory cytokine, has been implicated in the development of vascular diseases. We previously demonstrated that mechanical stress can initiate signaling pathways leading to smooth muscle cell (SMC) proliferation and apoptosis, but little is known concerning cyclic stress-induced inflammatory response. To explore the role of stretch in the upregulation of cytokine expression in SMCs we performed RNase protection assay for a panel of cytokines and found that mechanical stress resulted in a time-dependent induction of IL-6 mRNA but not other cytokines, e.g., IL-1alpha, IL-1beta, IL-6, IL-10, IL-12p35, IL-12p40, IL-18, IFN-gamma, and macrophage migration inhibitory factor (MIF). This induction also correlated with elevated IL-6 protein levels in the supernatant. Pretreatment of the cells with NF-kappaB inhibitors inhibited NF-kappaB activity and resulted in marked inhibition (50%) of IL-6 protein. Moreover, SMC lines stably expressing dominant-negative Ras (RasN17) or Rac (RacN17) exhibited a remarkable decrease in p38 MAPK activity and IL-6 mRNA induction by mechanical stress. Furthermore, a significant inhibition of 30 and 40% in IL-6 protein was observed in SMCs pretreated with inhibitors of p38 MAPK and ERK1/2, respectively, but not JNK. Interestingly, SMCs isolated from PKC-delta-deficient mice exhibited higher levels of IL-6 compared with wild-type cells. Finally, high levels of IL-6 expression were observed in atherosclerotic lesions of vein bypass grafts, which are related to altered biomechanical stress. Our findings demonstrate that biomechanical stress-induced IL-6 expression occurs via a mechanism that involves Ras/Rac/p38 MAPK/NF-kappaB/NF-IL6 signaling pathways, which is downregulated by PKC-delta, and suggest that modulation of this event contributes to the pathogenesis of atherosclerosis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0363-6135
pubmed:author
pubmed:issnType
Print
pubmed:volume
288
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
H2946-54
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:15681696-Animals, pubmed-meshheading:15681696-Aorta, pubmed-meshheading:15681696-Arteriosclerosis, pubmed-meshheading:15681696-Biomechanics, pubmed-meshheading:15681696-Cell Cycle, pubmed-meshheading:15681696-Cells, Cultured, pubmed-meshheading:15681696-Cytokines, pubmed-meshheading:15681696-DNA Primers, pubmed-meshheading:15681696-Gene Expression Regulation, pubmed-meshheading:15681696-Interleukin-6, pubmed-meshheading:15681696-Mice, pubmed-meshheading:15681696-Muscle, Smooth, Vascular, pubmed-meshheading:15681696-NF-kappa B, pubmed-meshheading:15681696-RNA, Messenger, pubmed-meshheading:15681696-Reverse Transcriptase Polymerase Chain Reaction, pubmed-meshheading:15681696-Signal Transduction, pubmed-meshheading:15681696-Stress, Mechanical, pubmed-meshheading:15681696-p38 Mitogen-Activated Protein Kinases, pubmed-meshheading:15681696-ras Proteins
pubmed:year
2005
pubmed:articleTitle
Biomechanical stress induces IL-6 expression in smooth muscle cells via Ras/Rac1-p38 MAPK-NF-kappaB signaling pathways.
pubmed:affiliation
Dept. of Cardiac and Vascular Sciences, St. George's Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't