SNAP-23 regulates phagosome formation and maturation in macrophages.

Abstract:

:Synaptosomal associated protein of 23 kDa (SNAP-23), a plasma membrane-localized soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE), has been implicated in phagocytosis by macrophages. For elucidation of its precise role in this process, a macrophage line overexpressing monomeric Venus-tagged SNAP-23 was established. These cells showed enhanced Fc receptor-mediated phagocytosis. Detailed analyses of each process of phagocytosis revealed a marked increase in the production of reactive oxygen species within phagosomes. Also, enhanced accumulation of a lysotropic dye, as well as augmented quenching of a pH-sensitive fluorophore were observed. Analyses of isolated phagosomes indicated the critical role of SNAP-23 in the functional recruitment of the NADPH oxidase complex and vacuolar-type H(+)-ATPase to phagosomes. The data from the overexpression experiments were confirmed by SNAP-23 knockdown, which demonstrated a significant delay in phagosome maturation and a reduction in uptake activity. Finally, for analyzing whether phagosomal SNAP-23 entails a structural change in the protein, an intramolecular Förster resonance energy transfer (FRET) probe was constructed, in which the distance within a TagGFP2-TagRFP was altered upon close approximation of the N-termini of its two SNARE motifs. FRET efficiency on phagosomes was markedly enhanced only when VAMP7, a lysosomal SNARE, was coexpressed. Taken together, our results strongly suggest the involvement of SNAP-23 in both phagosome formation and maturation in macrophages, presumably by mediating SNARE-based membrane traffic.

journal_name

Mol Biol Cell

authors

Sakurai C,Hashimoto H,Nakanishi H,Arai S,Wada Y,Sun-Wada GH,Wada I,Hatsuzawa K

doi

10.1091/mbc.E12-01-0069

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

4849-63

issue

24

eissn

1059-1524

issn

1939-4586

pii

mbc.E12-01-0069

journal_volume

23

pub_type

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