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- W2036688545 abstract "Anti-receptor antibodies have previously been used in two cytokine systems (IL-1 and TNFα) to identify the existence of different cytokine receptors on different cell types. In this study, we have similarly used two approaches to evaluate whether IL-4 receptors on different cell types are identical, or whether more than one species of IL-4 receptor exists. The first approach involved production of monoclonal antibodies specific for the IL-4 receptor expressed by the murine mast cell line, MC/9. Six anti-IL-4 receptor monoclonal antibodies were produced against the purified soluble extracellular domain of the recombinant IL-4 receptor derived from MC/9 cells. These antibodies were capable of binding to and specifically immunoprecipitating the soluble extracellular domain of the recombinant mast cell IL-4 receptor. Following biotinylation of the antibodies and addition of phycoerythrin-streptavidin, their binding to cell associated IL-4 receptors on MC/9 mast cells could be readily visualized by immunofluorescence. Using this approach, the anti-mast cell IL-4R antibodies were found to specifically bind IL-4 receptors expressed on a variety of other murine cell types, including T cells, B cells, macrophages, fibroblasts, and L cells. The antibodies did not bind to two human cell lines known to bind human but not murine IL-4. The intensity of staining was directly related to the number of IL-4 binding sites identified previously by receptor-ligand equilibrium binding analyses. As a second approach to evaluating potential receptor heterogeneity, we constructed S1 nuclease protection assay probes for two separate regions of the mast cell IL-4 receptor, one located in the extracellular domain and one in the intracellular domain. Subsequent S1 analyses showed that both regions are expressed by the following types of cells: T cells, B cells, macrophages, myeloid cells, L cells, and stromal cells. The two approaches used in this study therefore indicate that the same or highly similar IL-4 receptor species is expressed by a wide variety of hemopoietic and nonhemopoietic cells. Since the anti-IL-4 receptor antibodies produced in this study did not block binding of IL-4 to its receptor, we cannot exclude the possible existence of a second type of IL-4R coexpressed on the cells tested in this study, or expressed uniquely by other cell types that were not investigated." @default.
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- W2036688545 date "1991-08-01" @default.
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- W2036688545 title "Evaluation of murine interleukin 4 (IL-4) receptor expression using anti-receptor monoclonal antibodies and S1 nuclease protection analyses" @default.
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- W2036688545 doi "https://doi.org/10.1016/0008-8749(91)90389-s" @default.
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