Evidence for different interleukin 1 receptors in murine B- and T-cell lines.
Previous studies have shown that binding of interleukin 1 (IL-1) to its receptor and intracellular processing of the IL-1/IL-1 receptor complex appear to be different in B- and T-lymphocyte cell lines. In this study we used a B-lymphoid cell line, 70Z/3, and T-lymphoid cell line, EL-4 6.1 C10, to explore further the differences that exist between IL-1 receptors on cells of B and T lineage. We show that a monoclonal antibody against the IL-1 receptor on EL-4 cells does not bind to the IL-1 receptor on 70Z/3 cells. This finding suggests that there are structural differences in the extracellular domains of the IL-1 receptors on the two cell lines. Furthermore, affinity crosslinking showed that the molecular mass of the IL-1 receptor on EL-4 is 87 kDa, whereas that of 70Z/3 is significantly lower (66 kDa). Activation of phospholipid/Ca2+-dependent protein kinase, protein kinase C, by phorbol 12-myristate 13-acetate (PMA) greatly reduced the number of IL-1 binding sites on 70Z/3. But, in sharp contrast, PMA had no effect on surface IL-1 receptor expression on EL-4 cells despite having an equally potent effect in activating protein kinase C. The different effects of protein kinase C suggest that the cytoplasmic domains of the IL-1 receptors in 70Z/3 and EL-4 may also be different. Lastly, a probe containing the entire coding region of the murine T-cell IL-1 receptor hybridized under high stringency conditions with mRNA from EL-4 cells but not with mRNA from 70Z/3 cells. Taken together, the observations made in this study suggest that major structural differences exist between the IL-1 receptors on B and T lymphocytes.
Bomsztyk
K
K
Department of Medicine, University of Washington, Seattle 98195.
Sims
J E
JE
Stanton
T H
TH
Slack
J
J
McMahan
C J
CJ
Valentine
M A
MA
Dower
S K
SK
D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D005796:Genes / Q000187:drug effects; D007375:Interleukin-1 / Q000378:metabolism*; D007700:Kinetics; D051379:Mice; D008970:Molecular Weight; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism*; D011971:Receptors, Immunologic / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D017472:Receptors, Interleukin-1; D011994:Recombinant Proteins / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014158:Transcription, Genetic / Q000187:drug effects
D007375:Interleukin-1; D011948:Receptors, Antigen, T-Cell; D011971:Receptors, Immunologic; D017472:Receptors, Interleukin-1; D011994:Recombinant Proteins; D013755:Tetradecanoylphorbol Acetate