The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 182, 811-820, Copyright © 1995 by Rockefeller University Press


ARTICLES

Involvement of p59fynT in interleukin-5 receptor signaling [published erratum appears in J Exp Med 1995 Oct 1;182(4):1179]

MW Appleby, JD Kerner, S Chien, CR Maliszewski, S Bondada, RM Perlmutter and S] Bondadaa S [corrected to Bondada
Howard Hughes Medical Institute, Seattle, Washington 98195, USA.

Previous studies implicate the nonreceptor protein tyrosine kinase (PTK) p59fyn in the propagation of signals from the B cell antigen receptor. To elucidate the functions of this kinase, we examined B cell responsiveness in mice engineered to lack the hematopoietic isoform of p59fyn. Remarkably, antigen receptor signaling was only modestly defective in fynTnull B cells. In contrast, signaling from the interleukin (IL)-5 receptor which ordinarily provides a comitogenic stimulus with antiimmunoglobulin, was completely blocked. Our results document the importance of p59fynT in IL-5 responses in B cells, and they support a general model for cytokine receptor signal transduction involving the simultaneous recruitment of at least three families of PTK.
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