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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
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RAC1 induces nuclear alterations through the LINC complex to enhance melanoma invasiveness

Paula Colón-Bolea1, Rocío García-Gómez1,2, Sue Shackleton3

  • 1Instituto de Biomedicina y Biotecnología de Cantabria, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Cantabria, Santander 39011, Spain.

Molecular Biology of the Cell
|October 7, 2020
PubMed

Insights

RAC1 regulates melanoma cell invasion by altering nuclear shape. This pathway involves PAK1, microtubules, and the LINC complex, enhancing cell migration and metastasis.

Area of Science:

  • Cell Biology
  • Cancer Biology
  • Biochemistry

Background:

  • Rho GTPases, including RAC1, are crucial regulators of cytoskeleton dynamics.
  • Cell migration and metastasis are critical processes in tumor progression.
  • Nuclear morphology and plasticity significantly influence cell migration through confined spaces.

Purpose of the Study:

  • To investigate the role of RAC1 in regulating nuclear morphology in melanoma cells.
  • To elucidate the molecular mechanisms by which RAC1 influences melanoma cell invasion.
  • To determine the involvement of the Linker of Nucleoskeleton and Cytoskeleton (LINC) complex in RAC1-mediated nuclear alterations.

Main Methods:

  • Utilized melanoma cell models.
  • Investigated the effects of activated RAC1 on nuclear shape and cell migration.
  • Examined the roles of effector PAK1 and the tubulin cytoskeleton.
  • Assessed the impact of LINC complex disruption on RAC1-induced phenotypes.

Main Results:

  • Activated RAC1 promotes significant alterations in nuclear morphology in melanoma cells.
  • RAC1-induced nuclear changes are mediated through its effector PAK1 and the tubulin cytoskeleton.
  • Disruption of the LINC complex abrogates RAC1-induced nuclear alterations and invasive properties.
  • Enhanced nuclear plasticity driven by RAC1 facilitates melanoma cell migration and intravasation.

Conclusions:

  • RAC1 orchestrates melanoma cell invasion by modulating nuclear morphology.
  • The RAC1-PAK1-microtubule axis and the LINC complex are essential for RAC1-induced nuclear plasticity and cell invasiveness.
  • Targeting the RAC1 pathway could offer therapeutic strategies against melanoma metastasis.

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