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- W1885381640 abstract "The ability of cultured rat fibroblasts to phagocytose rat peritoneal mast cell granules has been previously demonstrated by light and electron microscopy. To determine if the heparin matrix of ingested granules could be degraded by fibroblasts after phagocytosis, the heparin within peritoneal mast cells was labeled with [35S]sulfate in vivo. The 35S-labeled rat peritoneal mast cells were purified and their granules were isolated and shown to contain [35S]heparin proteoglycan. Incubation of [35S]heparin proteoglycan-containing granules with cultured rat fibroblasts revealed internalization of radioactivity by the fibroblasts over the first 24 hr consistent with phagocytosis of the granules by these fibroblasts. The [35S]heparin proteoglycan internalized by the fibroblasts was shown to decrease in size over 72 hr indicating that the fibroblasts were capable of degrading the heparin within the ingested granules. Degradation of [35S]heparin proteoglycan within the fibroblast was accompanied by the appearance of free [35S]sulfate in the extracellular compartment. Similar findings were obtained using cultured human fibroblasts. These data demonstrate for the first time that both rat and human fibroblasts are not only capable of ingesting mast cell granules but also of degrading mast cell granule heparin proteoglycan. This ingestion and degradation of mast cell granules by fibroblasts may represent an important mechanism in the regulation of the biologic expression of heparin and other granule-associated mediators in immediate hypersensitivity reactions." @default.
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- W1885381640 date "1983-09-01" @default.
- W1885381640 modified "2023-10-12" @default.
- W1885381640 title "Degradation of the heparin matrix of mast cell granules by cultured fibroblasts." @default.
- W1885381640 doi "https://doi.org/10.4049/jimmunol.131.3.1420" @default.
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