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The respiratory burst of blood neutrophils has a critical role in the destruction of microorganisms and tissue damage in inflammation. Neutrophils adhere in a dose-dependent fashion to granule membrane protein 140 (GMP140), a member of the LEC-CAM (lectin/epidermal growth factor/complement-binding domain cell adhesion molecule) family of adhesion proteins when it is immobilized onto plastic surfaces. Adherence to GMP140 was associated with less superoxide anion generation than adherence to other surfaces, an effect that is especially remarkable after activation of neutrophils with tumor necrosis factor alpha, an agent that on other surfaces promotes adhesion and spreading. However, on GMP140 the cells fail to spread and instead remain rounded and refractile. Neutrophils adhering to GMP140 were also deficient in superoxide anion generation to formylmethionylleucylphenylalanine. Furthermore, fluid-phase GMP140 also inhibited the superoxide generation by neutrophils stimulated by tumor necrosis factor alpha. The effect of GMP140 was reversible by washing and was inhibited by anti-GMP140 Fab antibody. GMP140 appears to be a natural antiinflammatory molecule that may prevent the inappropriate activation of neutrophils in the circulation.

Adhesion protein GMP140 inhibits superoxide anion release by human neutrophils.