Clearance of neutrophil-derived myeloperoxidase by the macrophage mannose receptor - PubMed (original) (raw)
Clearance of neutrophil-derived myeloperoxidase by the macrophage mannose receptor
V L Shepherd et al. Am J Respir Cell Mol Biol. 1990 Apr.
Abstract
Uptake of neutrophil-derived myeloperoxidase by the macrophage mannose receptor was studied. Rat bone marrow-derived macrophages internalized 75% of [125I]myeloperoxidase through a mannose-specific process. Uptake via the mannose receptor is highly sensitive to treatment with oxidants. Treatment of rat macrophages with 1 mM H2O2 for 30 min resulted in a 94% reduction in uptake of myeloperoxidase. By Percoll gradient fractionation studies, 38% of internalized myeloperoxidase was delivered to the lysosomal compartment during a 15-min chase period, similar to findings for delivery of other ligands for this receptor. Once in the lysosome, the myeloperoxidase remained enzymatically active for several hours, with 50% activity remaining at 8 h. Finally, myeloperoxidase-containing macrophages had an increased capacity to down-regulate their own mannose receptors or receptors on neighboring macrophages, possibly through the myeloperoxidase-mediated production of oxidized halogens. Thus, the macrophage mannose receptor plays a potentially physiologic role in regulating extracellular myeloperoxidase levels. The receptor-mediated uptake may either arm the macrophage to contribute to oxidant-mediated tissue damage or may function to clear extracellular myeloperoxidase during the resolution phase of the inflammatory process.
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