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Blood. 1996 May 1;87(9):3688-93.

JAK2 is associated with the c-kit proto-oncogene product and is phosphorylated in response to stem cell factor.

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  • 1Division of Cancer Treatment, and Biological Carcinogenesis and Development Program, SAIC Frederick, National Cancer Institute, Frederick Cancer Research and Development Center, MD 21702, USA.


Stem cell factor (SCF) is a hematopoietic growth factor that interacts with the receptor tyrosine kinase, c-kit. We have found that SCF-stimulates rapid and transient tyrosine phosphorylation of JAK2 in human and murine cell lines, as well as in normal human progenitor cells. JAK2 and c-kit were associated in unstimulated cells with further recruitment of JAK2 to the c-kit receptor complex after SCF stimulation. Treatment of cells with JAK2 antisense oligonucleotides resulted in a 46% decrease in SCF-induced proliferation. These data demonstrate that SCF induces tyrosine phosphorylation of JAK2 and suggest that JAK2 is a component of the SCF signal transduction pathway.

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