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The FASEB Journal, Vol 11, 37-44, Copyright © 1997 by The Federation of American Societies for Experimental Biology

REVIEWS

The role of serine/threonine phosphorylation in hematopoietic cytokine receptor signal transduction

RA Mufson
Immunology Department, Jerome Holland Laboratory, American Red Cross, Rockville, Maryland 19855, USA.

The hematopoietic cytokine receptors rapidly activate tyrosine phosphorylation after ligand engagement. In addition, however, serine/threonine phosphorylation of important effector molecules also icreases. Interleukins 2-5 and granulocyte-macrophage colony stimulating factor all activate protein kinase C. This results in serine/threonine phosphorylation of such important regulatory molecules as Raf-1 kinase, myristoylated alanine-rich C kinase substrate, and SOS. These phosphorylated effector molecules are regulators of important genes related to cell survival and proliferation. In addition, as yet uncharacterized serine/threonine kinases associate directly with the hematopoietic receptor subunits themselves. These kinases may contribute to the phosphorylation of the STAT family of transcription factors that is important in regulating cytokine-specific gene inductions. Thus, it is time to begin integrating serine/threonine kinases into the postulated signaling pathways activated by hematopoietic cytokine receptors.


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