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

S R Weiler1, S Mou, C S DeBerry

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

Blood
|May 1, 1996
PubMed

Insights

Stem cell factor (SCF) signaling involves Janus kinase 2 (JAK2) phosphorylation. This study shows JAK2 is crucial for SCF-induced cell proliferation, highlighting its role in the SCF pathway.

Area of Science:

  • Hematology
  • Cell signaling
  • Molecular biology

Background:

  • Stem cell factor (SCF) is a key hematopoietic growth factor.
  • SCF interacts with the c-kit receptor tyrosine kinase.
  • Understanding SCF signaling is vital for hematopoiesis research.

Purpose of the Study:

  • To investigate the role of Janus kinase 2 (JAK2) in SCF signal transduction.
  • To determine if JAK2 is involved in SCF-mediated cellular responses.

Main Methods:

  • Utilized human and murine cell lines and normal human progenitor cells.
  • Analyzed SCF-stimulated tyrosine phosphorylation of JAK2.
  • Examined the association of JAK2 with the c-kit receptor complex.
  • Employed JAK2 antisense oligonucleotides to assess proliferation.

Main Results:

  • SCF stimulation induced rapid and transient tyrosine phosphorylation of JAK2.
  • JAK2 was found to associate with c-kit, with increased recruitment upon SCF stimulation.
  • JAK2 antisense oligonucleotides significantly reduced SCF-induced proliferation by 46%.

Conclusions:

  • SCF induces tyrosine phosphorylation of JAK2.
  • JAK2 is an integral component of the SCF signal transduction pathway.
  • JAK2 plays a critical role in SCF-driven cellular proliferation.

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