Functional effect of the R110Q IL13 genetic variant alone and in combination with IL4RA genetic variants

The Journal of Allergy and Clinical Immunology
Weiguo ChenGurjit K Khurana Hershey

Abstract

IL-13 is a key mediator of allergic asthma. IL-13 mediates its effects via its receptor, a heterodimer composed of IL-4R alpha and IL-13R alpha1. Polymorphic variants of both IL-13 and IL-4R alpha have been shown to be associated with atopy. We examined the functional consequences of the Q110 IL-13 variant in vitro and in vivo to determine whether it displays enhanced functional activity compared with R110 IL-13, both in the context of I50Q551 IL-4R alpha and of the atopy-associated variant V50R551 IL-4R alpha. We used a mouse cell line stably expressing human IL-4R alpha and IL-13R alpha1 that readily responds to human IL-4 and IL-13. For in vivo analyses, we used BALB/c mice. The Q110 IL-13 variant displayed significantly increased activity compared with R110 IL-13. Furthermore, mice treated with Q110 IL-13 variant displayed increased airways hyperresponsiveness relative to R110 IL-13. We then examined the functional consequences of Q110 IL-13 variant in combination with an atopy-associated variant of its receptor, IL-4R alpha (V50R551). Q110 IL-13 variant had increased activity on these cells as well, and, strikingly, the effect was greater than that observed in cells expressing I50Q551 IL-4R alpha. Either Q110 IL-13 variant...Continue Reading

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