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Fc receptor-triggered insertion of secretory granules into the plasma membrane of human neutrophils: selective retrieval during phagocytosis.

H Tapper and S Grinstein
J Immunol July 1, 1997, 159 (1) 409-418;
H Tapper
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S Grinstein
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Abstract

We studied the kinetics of secretion in human neutrophils stimulated by IgG-opsonized zymosan. Secretion of azurophilic and specific granules was quantified measuring the appearance of the granule markers CD63 and CD66b, respectively, at the cell surface. The kinetics of secretion was compared with the course of phagocytosis, revealed by the trapping of the fluid phase marker, Lucifer Yellow, in vacuoles containing zymosan particles. We found that secretion of both azurophilic and specific granules precedes phagosome sealing. An initial rapid phase of secretion was followed by a decrease in the amount of CD63 and CD66b at the cell surface. This subsequent disappearance of surface CD63 and CD66b was inhibited by cytochalasin B and probably represents internalization of the granular markers into the forming phagosome. The decrease in the amount of CD63 and CD66b exposed at the cell surface was not accompanied by a commensurate reduction in cell surface area, measured with the amphiphilic fluorescent dye FM1-43. These findings imply that CD63 and CD66b are selectively retrieved from the plasma membrane following secretion. Evidence is also presented that calcium is not the sole mediator of the rapid secretion of azurophilic and specific granules triggered by IgG-opsonized particles and that cytochalasin does not impair signaling of the calcium transient elicited by Fc receptors. Instead, actin disassembly appears to reduce the efficiency of the interaction between opsonized particles and their receptors, an effect that can be overcome by increasing the concentration of the stimulating particles.

  • Copyright © 1997 by American Association of Immunologists

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The Journal of Immunology
Vol. 159, Issue 1
1 Jul 1997
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Fc receptor-triggered insertion of secretory granules into the plasma membrane of human neutrophils: selective retrieval during phagocytosis.
H Tapper, S Grinstein
The Journal of Immunology July 1, 1997, 159 (1) 409-418;

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Fc receptor-triggered insertion of secretory granules into the plasma membrane of human neutrophils: selective retrieval during phagocytosis.
H Tapper, S Grinstein
The Journal of Immunology July 1, 1997, 159 (1) 409-418;
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Print ISSN 0022-1767        Online ISSN 1550-6606