Abstract
Macrophages, granulocytes and many lymphocytes express or secrete receptors for the Fc domain of immunoglobulins (Ig)1. These Fc receptors (FcRs) are heterogeneous and can be distinguished on the basis of their cellular distribution and specificities for different immunoglobulin isotypes. Although their functions are not completely understood, FcRs are known to be involved in triggering various effector cell functions and in regulating differentiation and development of B-cells1–4. One of the best characterized is the mouse macrophage-lymphocyte receptor for IgG1 and IgG2b (ref. 5). On macrophages, this FcR mediates the endocytosis of antibody-antigen complexes via coated pits and coated vesicles6,7, the phagocytosis of Ig-coated particles8, and the release of various inflammatory and cytotoxic agents1. It is possible that the receptor possesses an intrinsic ligand-activated ion channel activity responsible for some of these functions9,10. The IgG1/IgG2b FcR has been isolated and shown to be a transmembrane glycoprotein of relative molecular mass (Mr) 47,000–60,000 (47–60 K) containing four N-linked oligosaccharide chains and a large (>10K) cytoplasmic domain11. It is also immunologically indistinguishable from the murine Ly-17 alloantigen which, in turn, is tightly linked to the Mls lymphocyte activation locus12–14. Here we describe the isolation and characterisation of a complementary DNA clone encoding the whole of the IgG1/IgG2b FcR expressed by the mouse macrophage-like cell line P388D1. The receptor is a member of the immunoglobulin superfamily and, like Ly-17, maps to the distal portion of chromosome 1. cDNA probes detect one or two mRNA species in FcR+ macrophage and B-cell lines, but not in FcR− cells or a receptor-deficient variant derived from a FcR+ B-cell line15. Finally, DNA hybridization analysis indicates the receptor gene is partially deleted or rearranged in the FcR− variant.
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Lewis, V., Koch, T., Plutner, H. et al. A complementary DNA clone for a macrophage-lymphocyte Fc receptor. Nature 324, 372–375 (1986). https://doi.org/10.1038/324372a0
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DOI: https://doi.org/10.1038/324372a0
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