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  • Title: The primary binding subunit of the human interleukin-4 receptor is also a component of the interleukin-13 receptor.
    Author: Zurawski SM, Chomarat P, Djossou O, Bidaud C, McKenzie AN, Miossec P, Banchereau J, Zurawski G.
    Journal: J Biol Chem; 1995 Jun 09; 270(23):13869-78. PubMed ID: 7775445.
    Abstract:
    Interleukin (IL)-13 elicits a subset of the biological activities of the related IL-4. The basis of this functional similarity is that their specific cell-surface receptors (called IL-13R and IL-4R) are distinct, yet are complex and share a common subunit(s). The IL-4R primary binding subunit (called IL-4R alpha) does not by itself bind IL-13. We show that the ability of IL-13 to partially compete for IL-4 binding to some human cell types depended on co-expression of IL-4R and IL-13R. However, IL-13 binding was always associated with IL-4 binding. Hyper-expression of IL-4R alpha on cells expressing both IL-4R and IL-13R decreased their binding affinity for IL-4, abrogated the ability of IL-13 to compete for IL-4 binding, and yet had no effect on IL-13R properties. Anti-human IL-4R alpha monoclonal antibodies which blocked the biological function and binding of IL-4 also blocked the function and binding of IL-13. These data show that IL-4R alpha is a secondary component of IL-13R.
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