In dendritic cells, the NADPH oxidase 2 (NOX2) is recruited to the phagosomal membrane during antigen uptake. NOX2 produces reactive oxygen species (ROS) in the lumen of the phagosome which kill ingested pathogens, delay antigen breakdown and alter the peptide repertoire for presentation to T cells. How the integral membrane component of NOX2, cytochrome b558, traffics to phagosomes is incompletely understood. In this study, we show in dendritic cells derived from human blood-isolated monocytes that cytochrome b558 is initially recruited to the phagosome from the plasma membrane during phagosome formation. Cytochrome b558 also traffics from a lysosomal pool to phagosomes and this is required to replenish oxidatively damaged NOX2. We identified syntaxin-7, SNAP23 and VAMP8 as the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins mediating this process. Our data describe a key mechanism of how dendritic cells sustain ROS production after antigen uptake required to initiate T cell responses.
Oxidized phagosomal NOX2 is replenished from lysosomes
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Ilse Dingjan, Peter T. A. Linders, Luuk van den Bekerom, Maksim V. Baranov, Partho Halder, Martin ter Beest, Geert van den Bogaart; Oxidized phagosomal NOX2 is replenished from lysosomes. J Cell Sci 2017; jcs.196931. doi: https://doi.org/10.1242/jcs.196931
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