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• W1998160408 abstract "<i>Background:</i> Bacterial infections can cause a variety of airway diseases. Toll-like receptors (TLRs) directly respond to the presence of microbes and partake in the innate immune defense. TLR4 is activated by lipopolysaccharide (LPS), and has been detected in sinonasal tissue, epithelial cells and various inflammatory cells. Macrophage inflammatory protein 1α (MIP-1α) is a chemokine released during the inflammatory process. The present study investigated the potential role and regulation of MIP-1α in LPS-induced nasal inflammation. <i>Methods:</i> Thirty-two healthy individuals were intranasally challenged with LPS or vehicle. Nasal lavage was performed, followed by a nasal biopsy. Inflammatory cells were counted, MIP-1α levels analyzed and expression of MIP-1α mRNA in biopsies quantified. Neutrophils isolated from peripheral blood were treated with LPS and effects on MIP-1α release, cell survival, and the involved signal pathways, were investigated. <i>Results:</i> LPS challenge caused an increase of MIP-1α in nasal lavage. No corresponding change in mRNA expression was seen in nasal biopsies, suggesting the increase was not due to epithelial synthesis. Neutrophil numbers increased after LPS provocation. Treatment of isolated neutrophils with LPS delayed neutrophil apoptosis and resulted in a time- and concentration-dependent release of MIP-1α, which was reduced by inhibitors of transcription and of nuclear factor (NF)-κB, protein kinase C (PKC) and p38 MAPK pathways. <i>Conclusions:</i> Nasal LPS challenge results in release of MIP-1α. The release most likely originates from recruited neutrophils, via NF-κB-, PKC- and p38 MAPK-dependent pathways. LPS stimulation delayed neutrophil apoptosis. MIP-1α may constitute an important mediator in neutrophilic airway disease." @default.
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• W1998160408 date "2009-01-01" @default.
• W1998160408 modified "2023-10-16" @default.
• W1998160408 title "Nasal Challenge with LPS Stimulates the Release of Macrophage Inflammatory Protein 1α" @default.
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• W1998160408 doi "https://doi.org/10.1159/000189199" @default.
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