title: Chemotactic deactivation of human neutrophils: evidence for nonspecific and specific components.
abstract: Human polymorphonuclear neutrophils have been preexposed to activated complement as zymosan-activated serum (ZAS) or to the chemotactic oligopeptide N-formyl methionylphenylalanine (F-Met-Phe). Spontaneous migration and chemotactic responses toward the deactivating and other cytotaxins were monitored after washing and resuspension of cells in cytotaxin-free medium. Two patterns of deactivation were observed. Preexposure of the leukocytes to high doses of ZAS or F-Met-Phe decreased all subsequent migratory responses. Preexposure of the leukocytes to lower doses of ZAS or F-Met-Phe decreased only a subsequent chemotactic response to the deactivating cytotaxin. These results suggest two mechanisms, or components, of chemotactic deactivation.
mesh_terms: D002465:Cell Movement / Q000187:drug effects; D002634:Chemotaxis, Leukocyte / Q000187:drug effects*; D003165:Complement System Proteins; D004151:Dipeptides / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D008715:Methionine / Q000031:analogs & derivatives*; D009239:N-Formylmethionine / Q000031:analogs & derivatives* / Q000494:pharmacology; D009504:Neutrophils / Q000276:immunology*
chemical_list: D004151:Dipeptides; D009239:N-Formylmethionine; D003165:Complement System Proteins; D008715:Methionine