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ERK1/2 mitogen-activated protein kinase dimerization is essential for the regulation of cell motility

Dalia de la Fuente-Vivas1, Vincenzo Cappitelli1, Rocío García-Gómez1,2

  • 1Instituto de Biomedicina y Biotecnología de Cantabria (IBBTEC), Consejo Superior de Investigaciones Científicas (CSIC) - Universidad de Cantabria, Santander, Spain.

Molecular Oncology
|September 12, 2024
PubMed

Insights

ERK dimerization is essential for cell migration, impacting actin cytoskeleton rearrangements. Kinase suppressor of Ras 1 (KSR1) mediates this process, and its elevated levels correlate with mammary tumor metastasis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • ERK1/2 (extracellular signal-regulated kinases 1/2) are crucial for cell proliferation, survival, and migration.
  • While ERK activation is well-studied, the specific role of ERK dimerization in cellular processes remains largely unknown.

Purpose of the Study:

  • To investigate the role of ERK dimerization in cellular movement and its regulation.
  • To determine if ERK dimerization is necessary and sufficient for cell motility.
  • To identify key regulators involved in ERK dimerization-induced cell migration.

Main Methods:

  • Experimental manipulation of ERK dimerization using mutants.
  • Analysis of actin cytoskeleton dynamics.
  • Investigation of the role of scaffold protein KSR1.
  • Correlation analysis of KSR1 expression with clinical data.

Main Results:

  • Inhibiting ERK dimerization prevents cell movement by disrupting actin cytoskeleton remodeling.
  • A constitutively dimeric ERK mutant independently drives cell motility.
  • The scaffold protein KSR1 is essential for agonist-induced ERK dimerization and cell migration.
  • High KSR1 expression correlates with increased metastatic potential and poor prognosis in mammary tumors.

Conclusions:

  • ERK dimerization is a necessary and sufficient mechanism for inducing cell motility.
  • KSR1 acts as a critical mediator linking external signals to ERK dimerization and cell migration.
  • Both ERK dimerization and KSR1 are key regulators of cell motility and mammary tumor dissemination.
Keywords:
ERKKSRMAP kinasescell motilityscaffold proteins

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