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Pre-clinical Evaluation of Tyrosine Kinase Inhibitors for Treatment of Acute Leukemia
10:49

Pre-clinical Evaluation of Tyrosine Kinase Inhibitors for Treatment of Acute Leukemia

Published on: September 19, 2013

Stimulation of leukemia inhibitory factor receptor degradation by extracellular signal-regulated kinase

F Blanchard1, L Duplomb, Y Wang

  • 1Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, New York 14263, INSERM U463, France. frederic.blanchard@roswellpark.org

The Journal of Biological Chemistry
|June 20, 2000
PubMed

Insights

Leukemia inhibitory factor receptor alpha (LIFRalpha) levels decrease with LIF or growth factor treatment. This down-regulation, dependent on ERK1/2 signaling, reduces cell sensitivity to LIF.

Area of Science:

  • Cellular signaling pathways
  • Receptor biology
  • Cytokine signaling

Background:

  • Leukemia inhibitory factor (LIF) is crucial for cell growth and differentiation.
  • LIF exerts its effects through a receptor complex including LIF receptor alpha (LIFRalpha) and gp130.
  • Understanding LIFRalpha regulation is key to modulating LIF signaling.

Purpose of the Study:

  • To investigate the regulation of LIFRalpha expression and its impact on LIF signaling.
  • To identify the molecular mechanisms underlying LIFRalpha down-regulation.
  • To determine the functional consequences of LIFRalpha level changes.

Main Methods:

  • Cell culture experiments with LIF, Oncostatin M (OSM), insulin, and epidermal growth factor (EGF).
  • Western blotting to assess protein levels of LIFRalpha and gp130.
  • Analysis of LIFRalpha endocytosis and degradation pathways.
  • Use of protein kinase inhibitors and site-directed mutagenesis.

Main Results:

  • LIF, OSM, insulin, and EGF treatments decrease LIFRalpha levels in various cell types.
  • Down-regulation of LIFRalpha is specific and does not affect gp130 or OSM receptor beta.
  • Reduced LIFRalpha levels correlate with decreased cellular responsiveness to LIF.
  • LIFRalpha down-regulation is mediated by extracellular signal-regulated kinase 1/2 (ERK1/2) activation and phosphorylation at serine 185.
  • Phosphorylation promotes LIFRalpha degradation via the endosomal/lysosomal pathway.

Conclusions:

  • Growth factors and cytokines like OSM can specifically reduce LIF responsiveness by regulating LIFRalpha stability.
  • ERK1/2-dependent phosphorylation of LIFRalpha at S185 is a critical step in its down-regulation.
  • This mechanism provides a way to modulate cellular sensitivity to LIF in physiological and pathological contexts.

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