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  • Title: Polymorphonuclear leukocyte opsonic receptor expression after hypoxia/reoxygenation.
    Author: Simms H, D'Amico R, Garner C.
    Journal: J Lab Clin Med; 1996 Apr; 127(4):364-81. PubMed ID: 8656040.
    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.
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