title: Polymorphonuclear leukocyte opsonic receptor expression after hypoxia/reoxygenation.
abstract: We investigated the effects of hypoxia/reoxygenation (H/R) and subsequent stimulation of polymorphonuclear leukocytes (PMNs) with either formyl-methionyl-leucyl-phenylalanine (FMLP) or phorbol myristate acetate (PMA) on CD32, CD16, CD35, and CD11b/CD18 expression and on degranulation and superoxide anion production. H/R primed both adherent and fluid-phase PMNs for subsequent up-regulation of CD32 and CD16 (Fcgamma receptors) when stimulated with FMLP and primed both Fcgamma and complement (CD35, CD11b/CD18) receptors when stimulated with PMA. Kinetics assays demonstrated maximal up-regulation of CD32 and CD16 induced by H/R plus FMLP after 30 minutes of reoxygenation, whereas maximal receptor stimulation by H/R plus PMA occurred within 15 minutes of reoxygenation. Neither actinomycin D nor cycloheximide abrogated the effect of H/R with subsequent stimulation of PMNs on receptor expression; however, 10(-5) to 10(-8) mol/L concentrations of either taxol or phalloidin completely abrogated the effect of H/R plus FMLP or PMA on opsonic receptor expression. The effect of H/R plus FMLP on CD32 and CD16 expression was blocked by pertussis toxin, whereas staurosporine, H-7, H-9, and genistein had no effect. Conversely, the effect of H/R plus PMA on CD32, CD16, CD35, and CD11b/CD18 expression was blocked by staurosporine and H-7 but not by H-9, pertussis toxin, or genistein. The up-regulation of CD32, CD16, CD35, and CD11b/CD18 induced by H/R plus FMLP or PMA in the presence or absence of matrix proteins resulted in the increased rosetting of E-anti-CD32, E anti-CD16, E-Con A, EC3b, and EC3bi, respectively. Reduced nicotinamide adenine dinucleotide phosphate oxidase inhibition with diphenyleneiodonium blocked the effect of H/R on receptor expression, degranulation, and superoxide anion production. These results demonstrate that H/R primes PMNs for subsequent receptor up-regulation by divergent intracellular signal transduction pathways and that the receptors induced to the cell surface are biologically active.
authors.affiliation: Brown University School of Medicine, Department of Surgery, Providence, Rhode Island, USA.
authors.forename: H
authors.initials: H
authors.lastname: Simms
authors.forename: R
authors.initials: R
authors.lastname: D'Amico
authors.forename: C
authors.initials: C
authors.lastname: Garner
mesh_terms: D000911:Antibodies, Monoclonal; D015703:Antigens, CD / Q000096:biosynthesis*; D002448:Cell Adhesion; D015687:Cell Hypoxia; D016326:Extracellular Matrix Proteins / Q000494:pharmacology; D006801:Humans; D007700:Kinetics; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism; D019255:NADPH Oxidases; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism*; D009895:Opsonin Proteins / Q000276:immunology*; D010100:Oxygen / Q000502:physiology*; D011971:Receptors, Immunologic / Q000096:biosynthesis*; D015398:Signal Transduction; D015854:Up-Regulation
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D016326:Extracellular Matrix Proteins; D009895:Opsonin Proteins; D011971:Receptors, Immunologic; D009240:N-Formylmethionine Leucyl-Phenylalanine; D009247:NADH, NADPH Oxidoreductases; D019255:NADPH Oxidases; D010100:Oxygen