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Related Experiment Videos

Interleukin 2 high-affinity receptor expression requires two distinct binding proteins.

K Teshigawara, H M Wang, K Kato

    The Journal of Experimental Medicine
    |January 1, 1987
    PubMed
    Summary
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    Researchers identified a novel intermediate-affinity IL-2 binding site on leukemia cells. This finding suggests two IL-2 binding proteins are necessary for high-affinity IL-2 receptor function.

    Area of Science:

    • Immunology
    • Molecular Biology
    • Cell Biology

    Background:

    • Interleukin-2 (IL-2) receptors mediate T cell activation.
    • Previously, high- and low-affinity IL-2 binding sites were characterized.
    • The exact composition of the high-affinity IL-2 receptor remained unclear.

    Purpose of the Study:

    • To investigate a novel IL-2 binding site identified on an acute lymphoblastic leukemia cell line.
    • To re-evaluate the structural components of the high-affinity IL-2 receptor.

    Main Methods:

    • Cell line establishment and cloning.
    • IL-2 binding assays.
    • Western blotting and mRNA detection (Northern blot).
    • Crosslinking studies with radiolabeled IL-2.

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    Main Results:

    • A novel IL-2 binding protein, distinct from the Tac antigen, was identified.
    • This new protein, along with the Tac antigen, is required for high-affinity IL-2 binding.
    • Leukemic cell lines lacking high-affinity receptors expressed only the larger (Mr = 75,000) IL-2 binding protein.

    Conclusions:

    • High-affinity IL-2 binding requires the co-expression of two distinct IL-2 binding proteins.
    • The Tac antigen (p55) alone mediates low-affinity binding.
    • A second, larger protein (p75) is essential for high-affinity IL-2 receptor formation.