The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 181, 1425-1431, Copyright © 1995 by Rockefeller University Press


ARTICLES

Regulation of JAK3 expression in human monocytes: phosphorylation in response to interleukins 2, 4, and 7

T Musso, JA Johnston, D Linnekin, L Varesio, TK Rowe, JJ O'Shea and DW McVicar
Biological Carcinogenesis and Development Program, Program Resources, Inc./DynCorp, Frederick, Maryland 21702-1201, USA.

The Janus family of kinases (JAKs) has been shown to be involved in the signal transduction of a number of cytokine receptors. Recently, we have cloned a novel JAK family member, JAK3, that is expressed in natural killer and activated T cells and is coupled functionally and physically to the interleukin 2 (IL-2) receptor in these cells. Here we report that JAK3 was expressed at low but detectable levels in human monocytes. In contrast, JAK3 expression was strongly induced during activation by interferon gamma (IFN-gamma) or lipopolysaccharide. Moreover, JAK3 became tyrosine phosphorylated in response to IL-2, IL- 4, and IL-7 but not response to IFN-gamma or granulocyte/macrophage colony-stimulating factor. Together, these findings suggest that JAK3 is functionally important in activated monocytes and cells of the myeloid lineage and is involved in signaling responses of cytokines that use the common gamma-chain of the IL-2 receptor.
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