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. 1989 Oct;86(20):8034–8038. doi: 10.1073/pnas.86.20.8034

Evidence for different interleukin 1 receptors in murine B- and T-cell lines.

K Bomsztyk 1, J E Sims 1, T H Stanton 1, J Slack 1, C J McMahan 1, M A Valentine 1, S K Dower 1
PMCID: PMC298208  PMID: 2530580

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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