Level of expression of IL-13Rα2 impacts receptor distribution and IL-13 signaling

Michael O. Daines, Yasuhiro Tabata, Bradley A. Walker, Weiguo Chen, Manoj R. Warrier, Saswata Basu, Gurjit K. Khurana Hershey

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

IL-13, a critical cytokine for allergic inflammation, exerts its effects through a complex receptor system including IL-4Rα, IL-13Rα1, and IL-13Rα2. IL-4Rα and IL-13Rα1 form a heterodimeric signaling receptor for IL-13. In contrast, IL-13Rα2 binds IL-13 with high affinity but does not signal. IL-13Rα2 exists on the cell surface, intracellularly, and in soluble form, but no information is available regarding the relative distributions of DL-13Rα2 among these compartments, whether the compartments communicate, and how the relative expression levels impact IL-13 responses. Herein, we investigated the distribution of IL-13Rα2 in transfected and primary cells, and we evaluated how the total level of IL-13Rα2 expression impacted its distribution. Our results demonstrate that the distribution of IL-13Rα2 is independent of the overall level of expression. The majority of the IL-13Rα2 protein existed in intracellular pools. Surface IL-13Rα2 was continually released into the medium in a soluble form, yet surface expression remained constant supporting receptor trafficking to the cell surface. IL-13Rα2 inhibited IL-13 signaling proportionally to its level of expression, and this inhibition could be overcome with high concentrations of IL-13.

Original languageEnglish (US)
Pages (from-to)7495-7501
Number of pages7
JournalJournal of Immunology
Volume176
Issue number12
DOIs
StatePublished - Jun 15 2006

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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    Daines, M. O., Tabata, Y., Walker, B. A., Chen, W., Warrier, M. R., Basu, S., & Khurana Hershey, G. K. (2006). Level of expression of IL-13Rα2 impacts receptor distribution and IL-13 signaling. Journal of Immunology, 176(12), 7495-7501. https://doi.org/10.4049/jimmunol.176.12.7495