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  • Title: LPS challenge in healthy subjects: an investigation of neutrophil chemotaxis mechanisms involving CXCR1 and CXCR2.
    Author: Aul R, Patel S, Summerhill S, Kilty I, Plumb J, Singh D.
    Journal: Int Immunopharmacol; 2012 Jul; 13(3):225-31. PubMed ID: 22561413.
    Abstract:
    LPS inhalation was used to investigate whether sputum supernatant post-LPS challenge increases neutrophil chemotactic activity and to elucidate the role of CXCR1/CXCR2 signalling in this process. 14 healthy non-smoking subjects inhaled 30μg of LPS. Sputum was induced at baseline, 6 and 24h post-LPS challenge. Differential cell counts were determined and supernatants CXCL8, CXCL1, IL-6 and CCL2 levels measured. Peripheral blood neutrophils obtained from healthy volunteers were used for chemotaxis experiments using sputum supernatant. To delineate signalling mechanisms, the effects of a CXCR2/CXCR1 (dual) antagonist (Sch527123) and a CXCR2 specific antagonist (SB656933) were tested. LPS inhalation significantly increased sputum neutrophil counts from 45.3% to 76.7% and 69.3% at 6 and 24h respectively. LPS increased CXCL8, IL-6 and CCL2 levels but not CXCL1. Neutrophil chemotaxis significantly increased (2.7 fold) at 24h compared to baseline. Chemotaxis was inhibited by 79.0% with Sch527123 and 52.0% with SB656933. We conclude that LPS challenge increases sputum supernatant CXCL8 levels, which is associated with increased chemotactic activity which is dependent on both CXCR1 and CXCR2.
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