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Mast cell heterogeneity. Differential synthesis and expression of glycosphingolipids by mouse serosal mast cells as compared to IL-3-dependent bone marrow culture-derived mast cells before or after coculture with 3T3 fibroblasts



Mast cell heterogeneity. Differential synthesis and expression of glycosphingolipids by mouse serosal mast cells as compared to IL-3-dependent bone marrow culture-derived mast cells before or after coculture with 3T3 fibroblasts



Journal of Immunology 145(5): 1463-1468



The synthesis and intracellular expression of glycosphingolipids by mouse serosal mast cells (SMC) have been characterized by radiolabeling and TLC and by immunodetection in situ. Chromatographic analysis of purified glycosphingolipids from SMC intrinsically labeled with [14C]galactose and [14C]glucosamine hydrochloride revealed the predominant synthesis of only the simplest neutral glycosphingolipid and ganglioside, glucosylceramide and ganglioside GM3, respectively. Intracellular indirect immunofluorescence staining of permeabilized SMC demonstrated the absence of the more complex neutral glycosphingolipids lactosylceramide, globotriosylceramide, globotetraosylceramide, and globopentaosylceramide, the absence of ganglioside GM1, and the presence of ganglioside GM3. By contrast, permeabilized mouse IL-3-dependent bone marrow culture-derived mast cells (BMMC) and mast cells recovered after 21 days of coculture of BMMC with mouse 3T3 fibroblasts expressed lactosylceramide, globotriosylceramide, globotetraosylceramide, ganglioside GM1, and ganglioside GM3, but not globopentaosylceramide intracellularly as determined by immunofluorescence. The findings indicate a loss of biosynthetic capacity and epitope maintenance for glycosphingolipids with in vivo differentiation of SMC from IL-3-dependent BMMC progenitors. Thus, although mast cells derived after coculture of these progenitors for 21 days with fibroblasts assume multiple SMC-like properties in terms of their histochemical staining and their secretory granule proteoglycan and neutral protease constituents, they do not lose the ability to express complex glycosphingolipids. The finding that glycosphingolipid composition does not change coordinately with other secretory granule markers defines a new stage of mouse mast cell development between the BMMC and SMC and provides evidence that mast cell development is more complex than previously appreciated.

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Accession: 040644649

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PMID: 2200824


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