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Characterization of a receptor for interleukin 5 on human eosinophils: variable expression and induction by granulocyte/macrophage colony-stimulating factor.

Abstract : Interleukin 5 (IL-5) acts on eosinophil differentiation and activation, suggesting the existence of a membrane receptor for IL-5 on eosinophils. Here, we report that 125I-labeled recombinant human IL-5 bound, at 4 degrees C, to high affinity receptors on human eosinophils. The association constant was higher for hypodense eosinophils (1.93 x 10(9) M-1) than for normodense cells (0.39 x 10(9) M-1), with a closely related number of receptor sites per cell. No specific binding occurred on neutrophils. The specific binding of IL-5 was induced by overnight incubation at 37 degrees C of human eosinophils with granulocyte/macrophage (GM)-CSF. The levels of increase were significantly higher for normodense than for hypodense eosinophils, suggesting a previous in vivo activation of the later subpopulation by GM-CSF. IL-3 was ineffective by itself but synergistically enhanced the effect of GM-CSF. Specificity studies showed that the binding of 125I-labeled IL-5 was inhibited by IL-5, but not by other cytokines, on human eosinophils. These results show the existence of a specific binding site for IL-5 on human eosinophils with a variable affinity on eosinophil hypodense or normodense subpopulations, as previously reported for other membrane receptors.
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https://hal-univ-tours.archives-ouvertes.fr/hal-02414846
Contributor : Valérie Gouilleux <>
Submitted on : Monday, December 16, 2019 - 6:09:20 PM
Last modification on : Friday, January 10, 2020 - 4:12:10 PM

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J Chihara, J. Plumas, V Gruart, J. Tavernier, L Prin, et al.. Characterization of a receptor for interleukin 5 on human eosinophils: variable expression and induction by granulocyte/macrophage colony-stimulating factor.. Journal of Experimental Medicine, Rockefeller University Press, 1990, 172 (5), pp.1347-1351. ⟨10.1084/jem.172.5.1347⟩. ⟨hal-02414846⟩

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