title: Identification of a cell membrane receptor for interferon induction by poly rI:rC.
abstract: PR-RK, a cell line derived from rabbit kidney cells (RK-13), was insensitive to the cytotoxic effect and interferon (IFN) inducing activity of the copolymer of riboinosinic and ribocytidylic acid (poly rI:rC). However, PR-RK was sensitive to the cytotoxic effect of the copolymer of riboadenylic and ribouridylic acid (poly rA:rU). Comparison of PR-RK cells and RK-13 cells by cytofluorometric analysis revealed that the binding of poly rI:rC was considerably reduced on PR-RK cells. These results suggested that the receptor for poly rI:rC might be different from the receptor for poly rA:rU, and this difference could provide a basis for the identification of the dsRNA receptor on cell surface. Western blot analysis of the components of cell membrane fraction prepared from RK-13 cells was performed by using a monoclonal antibody, which binds to cell membrane of RK-13 cells but not to PR-RK cells, and which blocks IFN induction by poly rI:rC in RK-13 cells. The 60K protein was identified as one of the poly rI:rC receptor protein.
mesh_terms: D000818:Animals; D001665:Binding Sites; D016923:Cell Death / Q000187:drug effects; D002460:Cell Line; D002462:Cell Membrane / Q000378:metabolism; D007372:Interferons / Q000096:biosynthesis; D011063:Poly A-U / Q000378:metabolism / Q000494:pharmacology; D011070:Poly I-C / Q000378:metabolism* / Q000494:pharmacology; D012330:RNA, Double-Stranded / Q000378:metabolism; D011817:Rabbits; D011956:Receptors, Cell Surface; D011971:Receptors, Immunologic / Q000378:metabolism*
chemical_list: D012330:RNA, Double-Stranded; D011956:Receptors, Cell Surface; D011971:Receptors, Immunologic; C045250:poly I-C receptor; D011063:Poly A-U; D007372:Interferons; D011070:Poly I-C