The Journal of Immunology, Vol 145, Issue 8 2626-2632, Copyright © 1990 by American Association of Immunologists

ARTICLES

Noncytotoxic activation of neutrophils by eosinophil granule major basic protein. Effect on superoxide anion generation and lysosomal enzyme release

JN Moy, GJ Gleich and LL Thomas
Department of Immunology/Microbiology, Rush Medical College, Chicago, IL 60612.

Eosinophil granule major basic protein (MBP) and neutrophils have each been implicated in the inflammatory late phase events of allergic disease. Based on this association and flow cytometric evidence presented in this report for MBP binding to neutrophils, we examined the ability of MBP to activate human neutrophils. Incubation of neutrophils with 0.5 to 3.0 microM MBP at room temperature produced a concentration-dependent chemiluminescence (CL) response that peaked after 50 to 70 min. Reduced-and-alkylated MBP, eosinophil cationic protein, and eosinophil-derived neurotoxin did not induce CL. MBP- induced CL was abrogated in the absence of Ca2+ and was absent in neutrophils isolated from two individuals with chronic granulomatous disease. MBP also stimulated release of superoxide anion (O2-) and lysozyme but not beta-glucuronidase or lactate dehydrogenase. Additionally, 1.5 microM MBP in combination with FMLP or platelet- activating factor stimulated a synergistic increase in O2- release from cytochalasin B-treated neutrophils. The degree of synergism with FMLP or platelet-activating factor was inversely related (p less than 0.005) to the level of MBP-induced O2- release. These results indicate that MBP activates neutrophils in a noncytolytic fashion and provide evidence that eosinophil-neutrophil collaboration may contribute to the pathogenesis observed in allergic late phase reactions.

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