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Knockdown of TAZ modifies triple-negative breast cancer cell sensitivity to EGFR inhibitors by regulating YAP

Liwen Guo1, Jiaping Zheng2, Jing Zhang1

  • 1Department of Surgical Oncology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, P.R. China.

Oncology Reports
|July 5, 2016
PubMed

Insights

Triple-negative breast cancer (TNBC) treatment faces challenges due to poor prognosis. Targeting TAZ/YAP alongside EGFR inhibitors may improve outcomes for TNBC patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Triple-negative breast cancer (TNBC) is an aggressive subtype with limited treatment options and poor prognosis.
  • EGFR is overexpressed in TNBC, but anti-EGFR therapy has shown limited clinical benefit.
  • Understanding resistance mechanisms is crucial for developing effective TNBC therapies.

Purpose of the Study:

  • To investigate the role of the transcriptional coactivator with PDZ-binding domain (TAZ) in regulating TNBC sensitivity to EGFR inhibitors (EGFRI).
  • To explore the potential of targeting TAZ/YAP in combination with EGFRI for TNBC treatment.

Main Methods:

  • Utilized gene knockdown of TAZ in TNBC cell lines.
  • Assessed the impact of TAZ inhibition on sensitivity to EGFRI.
  • Investigated the upregulation of YES-associated protein (YAP) in response to TAZ inhibition.

Main Results:

  • TAZ knockdown modulated TNBC cell line sensitivity to EGFRI in a context-dependent manner.
  • TAZ inhibition led to YAP upregulation in certain cell lines, conferring resistance to EGFRI.
  • These findings suggest a mechanism for acquired resistance to EGFR-targeted therapies.

Conclusions:

  • Combined inhibition of TAZ/YAP and EGFR may offer a more effective therapeutic strategy for TNBC.
  • The study provides a rationale for the limited success of EGFR-targeted therapies alone in TNBC.
  • Targeting TAZ/YAP represents a promising avenue for overcoming EGFRI resistance in TNBC.

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