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NOTCH1 intracellular domain negatively regulates PAK1 signaling pathway through direct interaction

Ji-Hye Yoon1, Jung-Soon Mo1, Eun-Jung Ann1

  • 1Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea.

Biochimica Et Biophysica Acta
|November 8, 2015
PubMed

Insights

NOTCH1 intracellular domain (NOTCH1-IC) directly interacts with and inhibits p21-activated kinase 1 (PAK1) signaling. This interaction regulates PAK1 localization and impacts downstream pathways involved in cell functions.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Cancer Research

Background:

  • p21-Activated kinase 1 (PAK1) is crucial for cytoskeletal dynamics, cell motility, proliferation, and invasion.
  • Recent evidence suggests PAK1's role in cell transformation and apoptosis regulation.

Purpose of the Study:

  • To investigate the regulatory relationship between NOTCH1 intracellular domain (NOTCH1-IC) and the PAK1 signaling pathway.
  • To elucidate the molecular mechanisms underlying NOTCH1-IC's effect on PAK1 activity.

Main Methods:

  • Co-immunoprecipitation assays to detect protein interactions.
  • Western blotting to assess protein phosphorylation levels (e.g., ILK1, GSK-3beta).
  • Cellular localization studies using overexpression and inhibition models.

Main Results:

  • NOTCH1-IC negatively regulates PAK1 signaling, decreasing ILK1 phosphorylation.
  • A novel direct interaction between NOTCH1-IC and PAK1 was identified.
  • NOTCH1-IC binding alters PAK1 localization between the nucleus and cytoplasm, disrupting PAK1-ILK1 interaction.

Conclusions:

  • NOTCH1-IC acts as a novel inhibitor of the PAK1 signaling pathway.
  • The interaction between NOTCH1-IC and PAK1 is critical for regulating PAK1 localization and downstream signaling.
  • These findings provide new insights into the crosstalk between NOTCH1 and PAK1 pathways in cellular processes.
Keywords:
ILK1LocalizationMigrationNOTCH1-ICPAK1Protein–protein interaction

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