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Fes mediates the IL-4 activation of insulin receptor substrate-2 and cellular proliferation

H Jiang1, K Foltenyi, M Kashiwada

  • 1Department of Medicine and Microbiology, Columbia University, College of Physicians and Surgeons, New York, NY 10032, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|February 13, 2001
PubMed

Insights

The Fes tyrosine kinase is crucial for certain Interleukin-4 (IL-4) signaling pathways, impacting cell proliferation by regulating downstream kinases like PI3K and p70S6K.

Area of Science:

  • Immunology
  • Cell Signaling
  • Molecular Biology

Background:

  • Janus kinases (Jak) initiate cytokine signaling, but the roles of other nonreceptor tyrosine kinases are less understood.
  • Interleukin-4 (IL-4) signaling is vital for immune responses and cell growth, involving complex intracellular pathways.

Purpose of the Study:

  • To investigate the role of the Fes tyrosine kinase in Interleukin-4 (IL-4) signaling.
  • To elucidate the specific pathways within IL-4 signaling that are dependent on Fes.

Main Methods:

  • Utilized Jak1-deficient cell lines to assess Fes activation by IL-4.
  • Employed overexpression of kinase-inactive Fes to study its effects on downstream signaling molecules.
  • Analyzed the recruitment of phosphoinositide 3-kinase (PI3K) and activation of Akt and p70S6k kinases.

Main Results:

  • Jak1 is required for IL-4-mediated Fes activation.
  • IL-4 signaling diverges into Fes-dependent and Fes-independent pathways.
  • Kinase-inactive Fes inhibits IL-4-induced activation of insulin receptor substrate-2, PI3K recruitment, and p70S6k activation, correlating with reduced proliferation.
  • Mutant Fes does not affect IL-4-induced Akt activation.

Conclusions:

  • IL-4 signaling pathways exhibit differential requirements for specific tyrosine kinases, including Fes.
  • Targeting Fes or other specific kinases may allow for selective inhibition of IL-4-mediated cellular functions.

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