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• W2154032715 abstract "Silicosis is a chronic lung disease induced by the inhalation of crystalline silica. Exposure of cultured macrophages to crystalline silica leads to cell death; however, the mechanism of cell-particle interaction, the fate of particles, and the cause of death are unknown. Time-lapse imaging shows that mouse macrophages avidly bind particles that settle onto the cell surface and that cells also extend protrusions to capture distant particles. Using confocal optical sectioning, silica particles were shown to be present within the cytoplasmic volume of live cells. In addition, electron microscopy and elemental analysis showed silica in internal cellular sections. To further examine the phagocytosis process, the kinetics of particle uptake was quantified using an assay in which cells were exposed to ovalbumin (OVA)-coated particles, and an anti-OVA antibody was used to distinguish surface-bound from internalized particles. Fc receptor-mediated uptake of antibody-coated silica particles was nearly complete within 5 minutes. In contrast, no OVA-coated particles were internalized at this time. After 30 minutes, 30% of bound silica was internalized and uptake continued slowly thereafter. OVA-coated latex beads, regardless of surface charge, were internalized at a similarly slow rate. These results demonstrate that macrophages internalize silica and that nonopsonized phagocytosis occurs by a temporally, and possibly mechanistically, distinct pathway from Fc receptor-mediated phagocytosis. Eighty percent of macrophages die within 12 hours of silica exposure. Neither OVA coating nor tetramethylrhodamine isothiocyanate labeling has any effect on cell death. Interestingly, antibody coating dramatically reduces silica toxicity. We hypothesize that the route of particle entry and subsequent phagosome trafficking affects the toxicity of internalized particles." @default.
• W2154032715 created "2016-06-24" @default.
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• W2154032715 creator A5053963155 @default.
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• W2154032715 date "2008-11-01" @default.
• W2154032715 modified "2023-10-14" @default.
• W2154032715 title "The Phagocytosis of Crystalline Silica Particles by Macrophages" @default.
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• W2154032715 doi "https://doi.org/10.1165/rcmb.2008-0046oc" @default.
• W2154032715 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2574531" @default.
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