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• W2005088813 startingPage "2165" @default.
• W2005088813 abstract "Interleukin 2 (IL-2)-mediated signaling through its high-affinity receptor involves a complex interrelationship between IL-2 and two IL-2-binding chains, IL-2R alpha and beta chains. Previously with the reagents available it was difficult to define functional interactions between these two IL-2R subunits involved in IL-2 binding and signal transduction. To extend our understanding of the interplay between the two binding subunits we have done studies with the monoclonal antibody HIEI, which interferes with interaction of IL-2R alpha and beta chains (IL-2R alpha and IL-2R beta, respectively). Furthermore, we used two forms of IL-2, recombinant native IL-2 and F42A, an IL-2 analog (Phe-42----Ala substitution) that binds only to IL-2R beta. Analog F42A manifested 75-100% of the bioactivity of wild-type IL-2. This observation is inconsistent with the strict hierarchical IL-2-binding affinity conversion model previously proposed by Saito and coworkers [Saito Y., Sabe, H., Suzuki, N., Kondo, S., Ogura, T., Shimizu, A. & Honjo, T. (1988) J. Exp. Med. 168, 1563-1572] that predicted an ordered sequence of events in which IL-2 must first bind to IL-2R alpha before its interaction with IL-2R beta. Previous investigations using IL-2 variants were interpreted to show that IL-2R alpha merely acts to concentrate IL-2 to the cell surface and that no other meaningful interaction occurred between IL-2R alpha and IL-2R beta. However, our data are inconsistent with this view. We draw this conclusion on the basis of our observation that antibody HIEI, which reacts with an epitope of IL-2R alpha and interferes with interaction of this chain and IL-2R beta, inhibits the IL-2-dependent proliferative effects mediated by analog F42A. Furthermore, by blocking interaction of IL-2R alpha and IL-2R beta with the antibody HIEI, a decrease in the affinity of radiolabeled analog F42A for IL-2R beta was seen. In our proposed model IL-2R alpha contributes several functions to IL-2-mediated signaling through the high-affinity IL-2R. These functions include concentration of IL-2 within the two-dimensional surface of the plasma membrane as well as alteration of the functional capacity of IL-2R beta, an effect that does not require prior binding of IL-2R to IL-2R alpha. The IL-2R alpha-mediated augmentation of IL-2R beta functions involves affinity conversion of IL-2R beta, increasing its affinity for IL-2, and may involve facilitation of Il-2-mediated signaling after binding of IL-2 to this IL-2R beta." @default.
• W2005088813 created "2016-06-24" @default.
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• W2005088813 date "1992-03-15" @default.
• W2005088813 modified "2023-10-18" @default.
• W2005088813 title "The interleukin 2 receptor (IL-2R): the IL-2R alpha subunit alters the function of the IL-2R beta subunit to enhance IL-2 binding and signaling by mechanisms that do not require binding of IL-2 to IL-2R alpha subunit." @default.
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• W2005088813 doi "https://doi.org/10.1073/pnas.89.6.2165" @default.
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