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- W2400979752 abstract "Lung surfactant protein A (SP-A) is the main protein component of pulmonary surfactant, which lines the alveolar space. We examined the interaction between recombinant human SP-A and human macrophages or monocytes. Binding and uptake of SP-A adsorbed onto colloidal gold particles was followed by electron microscopy and quantitated on micrographs. SP-A particles were internalized via coated pits/vesicles and transported to secondary lysosomes. Uptake was inhibited in the presence of alpha-D-mannosyl-bovine serum albumin (BSA) but not by beta-D-galactosyl-BSA. Two mannose-dependent recognition mechanisms might mediate SP-A uptake by macrophages. First, as SP-A is a glycoprotein with N-glycosylated glycans it could act as a ligand for the mannose-specific receptor on macrophages. Second, as SP-A is a mannose-specific lectin itself it could bind to mannose residues on the macrophage's cell surface. Activity of the Man-receptor on macrophages was demonstrated with alpha-D-mannosyl-BSA coated onto gold particles. Exposed alpha-D-mannosyl residues on macrophages were identified by Concanavalin A adsorbed onto gold particles. Hence, both mechanisms may be involved in principle. As monocytes have no mannose-specific receptor activity on their cell surface but internalize SP-A gold particles in a mannose-dependent manner, we conclude that at least the second mechanism participates in the recognition of SP-A by macrophages." @default.
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- W2400979752 date "1989-12-01" @default.
- W2400979752 modified "2023-09-23" @default.
- W2400979752 title "The interaction of a lung surfactant protein (SP-A) with macrophages is mannose dependent." @default.
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