Function and signal transduction mediated by the interleukin 3 receptor system in hematopoiesis

Stem Cells
T Hara, A Miyajima

Abstract

Interleukin 3 (IL-3) promotes development of hematopoietic cells through activation of the IL-3 receptor (IL-3R) complex consisting of alpha and beta subunits. The alpha subunit binds IL-3 with low affinity and forms a high-affinity receptor with the common beta subunit (beta c). The beta c subunit does not bind any cytokine by itself but is involved in the formation of high-affinity functional receptors for IL-5 and GM-CSF. As the alpha subunits provide the specificity to cytokines and beta c plays a major role in signal transduction, IL-3, GM-CSF and IL-5 exhibit similar functions when they act on the same cells. Surprisingly, no apparent hematological defect other than a reduced number of eosinophils was found in knock-out mice lacking an entire function of IL-3, GM-CSF and IL-5; this indicates a remarkable functional overlap with other cytokine systems for hematopoiesis. Binding of the cytokines to the receptor induces activation of the JAK2 tyrosine kinase that associates with beta c and triggers the signaling events. The membrane proximal region of beta c is responsible for activation of JAK2 and STAT5, as well as for induction of c-myc. The signals induced by this region are required for cell-cycle progression and DNA sy...Continue Reading

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