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British Journal of Anaesthesia, Vol 78, Issue 6 714-717, Copyright © 1997 by The Board of Management and Trustees of the British Journal of Anaesthesia

LABORATORY INVESTIGATIONS

Effect of exogenous nitric oxide and superoxide on interleukin-8 from human polymorphonuclear leucocytes

B. H. Cuthbertson, H. F. Galley and N. R. Webster
Academic Unit of Anaesthesia and Intensive Care, University of Aberdeen, UK

Patients with acute inflammatory lung injury are commonly treated with inhaled nitric oxide. Nitric oxide has profound immunoregulatory effects. Increased concentrations of the cytokine interleukin-8 (IL-8) in bronchoalveolar lavage fluid has been associated with disease severity. We have investigated the effects of a nitric oxide donor and a combined nitric oxide-superoxide donor on lipopolysaccharide-mediated accumulation of IL-8 from cultured human neutrophils. Interleukin-8 was measured in culture supernatant after 20 h using enzyme immunoassay. The combined nitric oxide-superoxide donor, 3-morpholinosydnonimine (SIN-1), dose-dependently decreased lipopolysaccharide-mediated IL-8 accumulation (P < 0.01). SIN-1 also decreased IL-8 accumulation from unstimulated neutrophils (P < 0.001). In contrast, the pure nitric oxide donor, 1,2,3,4-oxatriazolium 5-amino chloride (GEA-3162), increased stimulated IL-8 accumulation (P < 0.01) and also increased IL- 8 accumulation in unstimulated cells (P < 0.002). Nitric oxide and superoxide have profound effects on IL-8. These results have important implications for the treatment of patients with acute lung injury with inhaled nitric oxide.
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