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Phosphorylation of Ser2078 modulates the Notch2 function in 32D cell differentiation

J Inglés-Esteve1, L Espinosa, L A Milner

  • 1Centre Oncologia Molecular, Institut de Recerca Oncologica. Hospitalet, Barcelona 08907, Spain.

The Journal of Biological Chemistry
|September 29, 2001
PubMed

Insights

Granulocyte colony-stimulating factor (G-CSF) triggers Notch2 phosphorylation, enabling myeloid cell differentiation. Granulocyte macrophage colony-stimulating factor (GM-CSF) does not induce this phosphorylation, thus inhibiting differentiation, revealing a key regulatory mechanism.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Notch signaling regulates cell fate determination in development and homeostasis.
  • Notch1 and Notch2 inhibit myeloid differentiation in a cytokine-specific manner.
  • The Notch cytokine response domain is crucial for this functional specificity.

Purpose of the Study:

  • To investigate the role of phosphorylation in Notch activity in response to cytokine signals.
  • To elucidate the mechanism by which Notch2 regulates myeloid differentiation.
  • To identify specific phosphorylation sites and residues involved in Notch2 regulation.

Main Methods:

  • Utilized 32D cells expressing intracellular Notch2 protein.
  • Stimulated cells with granulocyte colony-stimulating factor (G-CSF) and granulocyte macrophage colony-stimulating factor (GM-CSF).
  • Analyzed Notch2 phosphorylation status and its effect on myeloid differentiation.
  • Investigated the role of the Ser/Thr-rich region (amino acids 2067-2099) and Ser(2078) residue.

Main Results:

  • G-CSF stimulation induced phosphorylation of intracellular Notch2 at specific sites, leading to its inactivation and permitting myeloid differentiation.
  • GM-CSF stimulation did not induce phosphorylation at these sites, inhibiting differentiation.
  • Deletion of the Ser/Thr-rich region abrogated G-CSF-induced phosphorylation and inhibited differentiation irrespective of the cytokine.
  • Serine residue 2078 (Ser(2078)) was identified as critical for Notch2 phosphorylation and activity modulation during G-CSF-induced differentiation.

Conclusions:

  • Phosphorylation of Notch2 is a critical regulatory mechanism controlling myeloid differentiation in response to specific cytokines.
  • The phosphorylation status of Notch2, particularly at Ser(2078), dictates its inhibitory function and determines cell fate.
  • These findings highlight a novel layer of regulation in Notch signaling with implications for understanding cell differentiation processes.

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