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- W1569773602 abstract "Cultured rat embryonic skin fibroblasts phagocytosed rat mast cell granules added to the medium or released from co-cultured mast cells by rabbit anti-rat IgE or Compound 48/80. Electron microscopy of fibroblasts incubated with mast cell granules revealed that granules adjacent to the plasmalemma were engulfed by long, thin cytoplasmic processes. Internalization proceeded to fusion of encircling processes and formation of phagosomes. Microtubules and 60 A microfilaments became closely associated with the phagosomal membrane to which small vesicles and cisternae of endoplasmic reticulum fused. The rate of uptake of mast cell granules by fibroblasts was dependent upon temperature and granule concentration. Cytochalasin B inhibited granule uptake whereas colchicine and nocodazole had little effect. Phagocytosis was not influenced by actinomycin D and cycloheximide, was partially inhibited by fluoride, and was markedly inhibited by cyanide, azide, and 2,4-dinitrophenol. Supernatants from fibroblast cultures incubated with mast cell granules for 24 and 48 hr, during which period phagocytosis occurred, contained elevated levels of collagenase and beta-hexosaminidase, but normal levels of lactate dehydrogenase and superoxide dismutase. These results support the concept that immediate hypersensitivity reactions are in part terminated by phagocytosis of biologically active discharged mast cell granules by resident connective tissue fibroblasts. Further, it is suggested that a consequence of this process is an alteration in fibroblast behavior, providing a unique link between immediate hypersensitivity reactions and connective tissue responses to inflammation." @default.
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- W1569773602 date "1983-01-01" @default.
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- W1569773602 title "Phagocytosis of mast cell granules by cultured fibroblasts." @default.
- W1569773602 doi "https://doi.org/10.4049/jimmunol.130.1.341" @default.
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