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The Journal of Immunology, Vol 152, Issue 6 2960-2967, Copyright © 1994 by American Association of Immunologists
ARTICLES |
VC Broaddus, AM Boylan, JM Hoeffel, KJ Kim, M Sadick, A Chuntharapai and CA Hebert
Department of Medicine, San Francisco General Hospital, CA 94110.
Although the potent neutrophil chemotaxin, IL-8, is a known product of endotoxin-stimulated cells in vitro, the contribution of IL-8 to neutrophil recruitment in Gram-negative endotoxin inflammation in vivo is unknown. To determine whether neutralization of IL-8 would decrease endotoxin-induced neutrophil influx, we generated neutralizing mAbs to rabbit rIL-8 for use in our rabbit model of endotoxin-induced pleurisy. One mAb, ARIL8.2, specifically inhibited both rabbit rIL-8-induced chemotactic activity and activation of the rabbit IL-8 receptor transfected in 293 cells. Anesthetized rabbits with in-dwelling pleural catheters received either neutralizing mAb (ARIL8.2; 1 mg/kg) or irrelevant isotype-matched mAb (anti-HIV gp120) i.v. 1 h before as well as intrapleurally (20 micrograms/ml) at the time of intrapleural instillation of Escherichia coli endotoxin (200 ng bilaterally). ARIL8.2 blocked 77% of endotoxin-induced neutrophil influx (21 +/- 2 (SE) x 10(6) (ARIL8.2) vs 91 +/- 15 x 10(6) (anti-gp120) (p < 0.0001)). By Western analysis, a band corresponding to rabbit IL-8 was detected in the pleural liquid of rabbits in both groups. By ELISA, however, the concentration of free, unbound IL-8 in the pleural liquid was significantly less in the ARIL8.2 group than in the anti-gp120 group for at least 4 h, confirming that ARIL8.2 bound the IL-8 generated in vivo during that time. We conclude that neutralization of IL-8 profoundly inhibits neutrophil recruitment in endotoxin-induced pleurisy indicating that IL-8 is a major chemotactic factor in this model of acute inflammation.
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