title: Interleukin 3: A differentiation and growth factor for the mouse mast cell that contains chondroitin sulfate E proteoglycan.
abstract: Mouse mast cells were differentiated and grown by culturing bone marrow cells in medium containing 2 X 10(-10) M purified interleukin 3 (IL 3). The cells obtained were similar in ultrastructure, membrane antigen phenotype, proteoglycan type, and lipid products generated upon immunologic activation to mast cells differentiated in culture by WEHI-3-conditioned medium (WEHI-3-CM) and by concanavalin A (Con A) splenocyte-conditioned medium. Phenotypically, these cells expressed IgE receptors and H-2 antigens and were recognized by a monoclonal antibody (B23.1) that did not react with mouse serosal heparin-containing mast cells. The classic phenotypic markers of mouse T cells or macrophages were not detected. The mouse mast cells differentiated with IL 3 as well as those differentiated in WEHI-3-CM incorporated [35S]sulfate into a nonheparin proteoglycan of 150,000 to 200,000 m.w. Most of the 35S-labeled macromolecules were degraded by chondroitinase ABC to yield only two disaccharides, which co-chromatographed on ascending thin layer chromatography with delta Di-4S and delta Di-diSE; thus, the proteoglycan in these cells is composed of chondroitin sulfate E glycosaminoglycans. After sensitization with monoclonal IgE, washing, and antigen activation, the IL 3 differentiated cells released the preformed mediator beta-hexosaminidase and generated and released two major classes of lipid mediators. The quantities of leukotriene C4 (LTC4), leukotriene B4 (LTB4), and platelet-activating factor (PAF-acether) generated/10(6) cells were 17, 3.0, and 3.1 ng, respectively. The ratio of these three lipid mediators was similar to that obtained from mast cells differentiated in WEHI-3-CM and in Con A-conditioned medium. Thus, T cell-derived IL 3 is the component present in the conditioned media that is required for differentiation and growth of the subclass of mast cells containing chondroitin sulfate E proteoglycan, designated E-MC. The IL 3-dependent E-MC may represent the in vitro counterpart of the T-cell-dependent mucosal mast cell, suggesting in turn that the production of LTC4 and LTB4 and of PAF-acether may play a role in adaptive intestinal immunity to helminthic parasites.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002454:Cell Differentiation; D011508:Chondroitin Sulfate Proteoglycans / Q000032:analysis*; D003470:Culture Media; D006133:Growth Substances / Q000502:physiology*; D006636:Histamine Release; D007073:Immunoglobulin E / Q000276:immunology; D007377:Interleukin-3; D008222:Lymphokines / Q000502:physiology*; D008297:Male; D008407:Mast Cells / Q000166:cytology* / Q000276:immunology / Q000648:ultrastructure; D051379:Mice; D008807:Mice, Inbred BALB C; D010641:Phenotype; D011509:Proteoglycans / Q000032:analysis*
chemical_list: D011508:Chondroitin Sulfate Proteoglycans; D003470:Culture Media; D006133:Growth Substances; D007377:Interleukin-3; D008222:Lymphokines; D011509:Proteoglycans; D007073:Immunoglobulin E