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• W2023608933 abstract "BackgroundIL-13 and IL-4 share many functional properties as a result of their use of a common receptor complex comprising IL-13 receptor α 1 (IL-13Rα1) and IL-4 receptor α (IL-4Rα). The nonsignaling receptor IL-13 receptor α 2 (IL-13Rα2) binds IL-13 with high affinity and specificity and is believed to be a decoy receptor for IL-13.ObjectiveWe sought to examine the inhibitory effects of soluble and membrane-bound IL-13Rα2 on IL-13– and IL-4–mediated effects.MethodsPrimary human fibroblasts were grown from endobronchial biopsy specimens obtained from volunteers. Upregulation of IL-13Rα2 mRNA was measured by means of RT-PCR, and the level of surface expression was measured by means of FACS.ResultsWe found that a recombinant soluble form of IL-13Rα2 blocked the effects of IL-13, but not IL-4, in fibroblasts in vitro. However, we found that the transmembrane form of IL-13Rα2 could attenuate both IL-13 and IL-4 responses, even though the response to TNF-α was unaffected. Furthermore, we found that IL-13Rα2 became associated with IL-4Rα in the presence of IL-4. Addition of a blocking antibody to the extracellular domain of IL-13Rα2 restored responses of both IL-13 and IL-4.ConclusionThe ability of IL-13Rα2 to regulate IL-4 was previously unrecognized in primary airway cells. These data reveal a novel role for IL-13Rα2 as a negative regulator of both IL-13 and IL-4 signaling in human bronchial fibroblasts.Clinical implicationsIt appears that IL-13Rα2 might be a powerful suppressor of TH2-mediated responses and thus represents a potential therapeutic target for the treatment of asthma. IL-13 and IL-4 share many functional properties as a result of their use of a common receptor complex comprising IL-13 receptor α 1 (IL-13Rα1) and IL-4 receptor α (IL-4Rα). The nonsignaling receptor IL-13 receptor α 2 (IL-13Rα2) binds IL-13 with high affinity and specificity and is believed to be a decoy receptor for IL-13. We sought to examine the inhibitory effects of soluble and membrane-bound IL-13Rα2 on IL-13– and IL-4–mediated effects. Primary human fibroblasts were grown from endobronchial biopsy specimens obtained from volunteers. Upregulation of IL-13Rα2 mRNA was measured by means of RT-PCR, and the level of surface expression was measured by means of FACS. We found that a recombinant soluble form of IL-13Rα2 blocked the effects of IL-13, but not IL-4, in fibroblasts in vitro. However, we found that the transmembrane form of IL-13Rα2 could attenuate both IL-13 and IL-4 responses, even though the response to TNF-α was unaffected. Furthermore, we found that IL-13Rα2 became associated with IL-4Rα in the presence of IL-4. Addition of a blocking antibody to the extracellular domain of IL-13Rα2 restored responses of both IL-13 and IL-4. The ability of IL-13Rα2 to regulate IL-4 was previously unrecognized in primary airway cells. These data reveal a novel role for IL-13Rα2 as a negative regulator of both IL-13 and IL-4 signaling in human bronchial fibroblasts." @default.
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• W2023608933 date "2006-10-01" @default.
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• W2023608933 title "IL-13 receptor α 2: A regulator of IL-13 and IL-4 signal transduction in primary human fibroblasts" @default.
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• W2023608933 doi "https://doi.org/10.1016/j.jaci.2006.06.041" @default.
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