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The Journal of Immunology, Vol 137, Issue 11 3584-3587, Copyright © 1986 by American Association of Immunologists
ARTICLES |
RH Weisbart, DW Golde and JC Gasson
Human granulocyte-macrophage colony-stimulating factor (GM-CSF) modulates the function of mature neutrophils by priming for enhanced chemotaxis and oxidative metabolism in response to N-formyl-methionyl- leucyl-phenylalanine (f-Met-Leu-Phe). Our studies establish a relationship between f-Met-Leu-Phe receptor number and affinity and neutrophil chemotaxis and oxidative metabolism. A brief (5- to 15-min) exposure to physiologic concentrations of GM-CSF (10 pM to 100 pM) enhances f-Met-Leu-Phe-induced neutrophil chemotaxis by 85%, correlating with a rapid threefold increase (46,000/cell to 150,000/cell) in high-affinity neutrophil f-Met-Leu-Phe receptors. More prolonged incubation (1 to 2 hr) of neutrophils with GM-CSF is accompanied by a change to low-affinity f-Met-Leu-Phe receptors (Kd = 29 nM to Kd = 99 nM) concomitant with priming for enhanced neutrophil oxidative metabolism. Moreover, enhanced chemotactic responses to f-Met- Leu-Phe are no longer evident after more prolonged incubation of neutrophils with GM-CSF. These results show that a single lymphokine (GM-CSF) induces sequential changes in neutrophil f-Met-Leu-Phe receptor number and affinity that may enhance different physiologic responses.
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