Interleukin 5 signals through Shc and Grb2 in human eosinophils

American Journal of Respiratory Cell and Molecular Biology
M E BatesP J Bertics

Abstract

Eosinophils are potent effector cells contributing to allergic inflammation and asthma. The differentiation, recruitment, and effector functions of eosinophils are greatly affected by interleukin (IL)-5. In the eosinophil, signal transduction pathways including Jak-STAT and Ras-Raf-MAP kinase are stimulated by IL-5 and enzymatic activation of tyrosine kinases Jak-2 and Lyn has been demonstrated. The participation of adapter proteins in the responses of the Ras-Raf-MAP kinase pathway has been documented in many cytokine family receptors but the expression and activation of these proteins have not been demonstrated in eosinophils. In these studies, we have found three isoforms of the adapter protein, Shc, to be expressed in eosinophils. One of these isoforms, p52 Shc, was tyrosine phosphorylated following IL-5 treatment of eosinophils. A second adapter protein, Grb2, coimmunoprecipitated with Shc following IL-5 stimulation of eosinophils. Furthermore, p52 Shc was increasingly associated with a cell fraction resistant to detergent solubilization, following IL-5 administration. This cell fraction of limited detergent solubility is a complex mixture of proteins and the adapter protein Grb2, the tyrosine kinases Jak-2 and Lyn, the nu...Continue Reading

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