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Título : Role of Vesicle-Associated Membrane Protein-2, Through Q-Soluble N-Ethylmaleimide-Sensitive Factor Attachment Protein Receptor/R-Soluble N-Ethylmaleimide-Sensitive Factor Attachment Protein Receptor Interaction, in the Exocytosis of Specific and Tertiary Granules of Human Neutrophils
Autor : Mollinedo, Faustino; Martín-Martín, B.; Calafat, Jero; Nabokina, S. M.; Lazo, Pedro A.
Palabras clave : VAMP2
SNARE
Fecha de publicación : 2003
Editor: American Association of Immunologists
Citación : J. Immunol. 170: 1034-1042 (2003)
Resumen: We have examined the role of the R-soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) synaptobrevin- 2/vesicle-associated membrane protein (VAMP)-2 in neutrophil exocytosis. VAMP-2, localized in the membranes of specific and gelatinase-containing tertiary granules in resting human neutrophils, resulted translocated to the cell surface following neutrophil activation under experimental conditions that induced exocytosis of specific and tertiary granules. VAMP-2 was also found on the external membrane region of granules docking to the plasma membrane in activated neutrophils. Specific Abs against VAMP-2 inhibited Ca2 and GTP- -S-induced exocytosis of CD66b-enriched specific and tertiary granules, but did not affect exocytosis of CD63-enriched azurophilic granules, in electropermeabilized neutrophils. Tetanus toxin disrupted VAMP-2 and inhibited exocytosis of tertiary and specific granules. Activation of neutrophils led to the interaction of VAMP-2 with the plasma membrane Q-SNARE syntaxin 4, and anti-syntaxin 4 Abs inhibited exocytosis of specific and tertiary granules in electropermeabilized neutrophils. Immunoelectron microscopy showed syntaxin 4 on the plasma membrane contacting with docked granules in activated neutrophils. These data indicate that VAMP-2 mediates exocytosis of specific and tertiary granules, and that QSNARE/ R-SNARE complexes containing VAMP-2 and syntaxin 4 are involved in neutrophil exocytosis
URI : http://hdl.handle.net/10261/7042
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