title: Neutrophil migration induced by staphylococcal enterotoxin type A in mice: a pharmacological analysis.
abstract: Staphylococcal enterotoxin type A induced marked neutrophil migration into the mouse peritoneal cavity and was dependent on the number of resident macrophages. This migratory response was dose- (16-64 microg of staphylococcal enterotoxin type A/cavity) and time-dependent, peaking at 12 h and disappearing after 72 h. Dexamethasone (0.5 mg/kg) inhibited the neutrophil migration induced by staphylococcal enterotoxin type A (32 microg; 42% inhibition). A similar response was observed with the platelet-activating factor-acether receptor antagonist, BN 52021 (ginkgolide B, 3-(1,1-dimethylethyl)-hexahydro-1,4-7b-trihydroxy-8-methyl-9H-1,7alph a (epoxymethano-1H,6alphaH-cyclopenta (c) furo (2,3-b) furo (3', 2': 3,4) cyclopenta (1,2-d) furan-5, 9, 12 (4H)-trione); 10 mg/kg; 57% inhibition), the histamine H2 receptor antagonist, cimetidine (2 mg/kg; 31% inhibition), the lipoxygenase inhibitor, BWA4C (N-(3-phenoxycinnamyl) acetohydroxamic acid); 10 mg/kg; 73% inhibition), and capsaicin (trans-8-methyl-N-vanillyl-6-nonamide), a sensory C-fiber neuropeptide depletor. In contrast, indomethacin (5 mg/kg) had no effect on staphylococcal enterotoxin type A-induced chemotaxis. We conclude that the peritonitis induced by staphylococcal enterotoxin type A in mice is macrophage-dependent. The mechanism whereby staphylococcal enterotoxin type A stimulates macrophages to induce neutrophil recruitment remains to be elucidated.
authors.affiliation: Department of Pharmacology, Faculty of Medical Sciences, State University of Campinas, SP, Brazil.
authors.forename: I A
authors.initials: IA
authors.lastname: Desouza
authors.forename: G
authors.initials: G
authors.lastname: Ribeiro-DaSilva
mesh_terms: D000818:Animals; D002634:Chemotaxis, Leukocyte / Q000187:drug effects*; D004768:Enterotoxins / Q000494:pharmacology*; D008297:Male; D051379:Mice; D009504:Neutrophils / Q000187:drug effects* / Q000502:physiology; D010529:Peritoneal Cavity / Q000502:physiology; D013997:Time Factors
chemical_list: D004768:Enterotoxins; C026066:enterotoxin A, Staphylococcal; C031818:enterotoxin B, staphylococcal