title: Characterization of human interleukin 2 receptor (Tac antigen) in normal and leukemic T cells: co-expression of normal and aberrant receptors on Hut-102 cells.
abstract: Human interleukin 2 receptors ( IL2R ) from various cell sources such as mitogen-activated normal human T cells, adult T cell leukemia (ATL)-derived cell line cells (MT-1, ATL-6, Hut-102), and a natural killer-like cell line YT cells, were studied both by one- and two-dimensional sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), with a monoclonal anti- IL2R antibody (anti-Tac). In synthetic labeling with [35S]methionine, anti-Tac specifically precipitated two glycoproteins, one with m.w. of 60,000 to 65,000 and pI 4.2 to 4.7, and the other with m.w. about 40,000 and pI 6.2 to 6.5. A study of surface iodination revealed that the former component was membrane-associated mature IL2R , and a pulse-chase study showed that the latter component was a precursor for IL2R that already possessed tunicamycin-sensitive N-linked sugar side chain(s). This precursor was found to be posttranslationally processed into mature IL2R by further glycosylation within 240 min. Among the cells studied, a human T cell leukemia virus-positive leukemic cell line, Hut-102, was distinctive in that it possessed an additional membrane glycoprotein (m.w. 55,000 to 60,000, pI 4.2 to 5.0) also defined by anti-Tac. This unique glycoprotein of Hut-102 cells appeared to be an aberrant IL2R .
mesh_terms: D000328:Adult; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology / Q000302:isolation & purification*; D002460:Cell Line; D011232:Chemical Precipitation; D006023:Glycoproteins / Q000032:analysis / Q000096:biosynthesis / Q000378:metabolism; D006801:Humans; D007938:Leukemia / Q000276:immunology*; D008213:Lymphocyte Activation; D008970:Molecular Weight; D011971:Receptors, Immunologic / Q000096:biosynthesis / Q000302:isolation & purification*; D015375:Receptors, Interleukin-2; D013601:T-Lymphocytes / Q000032:analysis / Q000276:immunology / Q000378:metabolism*; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7
chemical_list: D000954:Antigens, Surface; D006023:Glycoproteins; D011971:Receptors, Immunologic; D015375:Receptors, Interleukin-2; D018127:Tumor Necrosis Factor Receptor Superfamily, Member 7