Abstract
Preincubation of neutrophils with recombinant human tumor necrosis factor-alpha (rH TNF-alpha) enhanced the subsequent release of superoxide anion in response to various concentrations of N-formylmethionylleucylphenylalanine (FMLP). Enhanced superoxide anion production was evident by 5 min and had reached a plateau by 15 min. Not only was the total amount of superoxide anion released greater, but the rate of release was also enhanced threefold by rH TNF-alpha. In contrast, rH TNF-alpha reduced or abolished neutrophil locomotion under agarose in response to a gradient of FMLP. Binding studies of f-Met-Leu-[3H]Phe to purified human neutrophils revealed a heterogeneous binding to unstimulated cells. The high affinity component consisted of approximately 2,000 sites per cell and had an average Kd of 2 +/- 0.7 nM (n = 4). The low affinity component consisted of approximately 40,000 sites per cell and had an average Kd of 180 +/- 50 nM (n = 4). rH TNF-alpha caused conversion to a linear Scatchard plot showing no significant change in total binding sites but a single Kd of 40 +/- 10 nM (n = 4). These data indicate that rH TNF-alpha may influence neutrophil responses to FMLP by regulating the affinity of FMLP receptors.
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