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Actin remodeling confers BRAF inhibitor resistance to melanoma cells through YAP/TAZ activation

Min Hwan Kim1, Jongshin Kim1, Hyowon Hong1

  • 1Graduate School of Medical Science and Engineering, KAIST, Daejeon, Korea.

The EMBO Journal
|December 16, 2015
PubMed

Insights

Actin remodeling drives YAP/TAZ-dependent resistance to BRAF inhibitors in melanoma. Inhibiting actin polymerization or targeting TESK1 may overcome this drug resistance, improving cancer therapy outcomes.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Transcriptional coactivators YAP and TAZ activation promotes anti-cancer therapy resistance.
  • YAP/TAZ activity is linked to the actin cytoskeleton.
  • The role of actin remodeling in cancer drug resistance is understudied.

Purpose of the Study:

  • To investigate the role of actin remodeling in YAP/TAZ-dependent BRAF inhibitor resistance in melanoma.
  • To identify potential therapeutic strategies targeting this resistance mechanism.

Main Methods:

  • Analysis of actin stress fiber formation in PLX4032-resistant melanoma cells.
  • Manipulation of YAP/TAZ expression (knockdown and overexpression).
  • Assessment of cell viability and YAP/TAZ nuclear accumulation.
  • Inhibition of actin polymerization and actomyosin tension.
  • siRNA library screening to identify key regulators.

Main Results:

  • Resistant melanoma cells show increased actin stress fibers, promoting YAP/TAZ nuclear accumulation.
  • YAP/TAZ knockdown reduced viability; YAP overexpression induced resistance.
  • Inhibiting actin polymerization/tension suppressed YAP/TAZ activation and resistance.
  • TESK1 was identified as a novel target in the YAP/TAZ-dependent resistance pathway.

Conclusions:

  • Actin remodeling plays a critical role in YAP/TAZ-mediated BRAF inhibitor resistance in melanoma.
  • Targeting actin dynamics, including TESK1, presents a potential strategy to overcome drug resistance.
  • This research offers new avenues for enhancing BRAF inhibitor efficacy in melanoma treatment.
Keywords:
BRAF inhibitor resistanceTAZYAPactin cytoskeletonmelanoma

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