Related Experiment Video

Updated: Jul 2, 2025

Generation of Prostate Cancer Cell Models of Resistance to the Anti-mitotic Agent Docetaxel
06:44

Generation of Prostate Cancer Cell Models of Resistance to the Anti-mitotic Agent Docetaxel

Published on: September 8, 2017

13.4K

ATPase Copper Transporting Beta (ATP7B) Is a Novel Target for Improving the Therapeutic Efficacy of Docetaxel by

Liankun Song1, Vyvyan Nguyen1, Jun Xie1

  • 1Department of Urology, University of California, Irvine, Orange, California.

Molecular Cancer Therapeutics
|February 28, 2024
PubMed

Insights

Docetaxel resistance in metastatic prostate cancer (mPCa) may be overcome by targeting copper transport. Lowering ATP7B levels or using disulfiram with copper enhances docetaxel efficacy in resistant mPCa.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Docetaxel is a standard first-line chemotherapy for metastatic prostate cancer (mPCa).
  • Resistance to docetaxel is a significant clinical challenge, with underlying molecular mechanisms often unclear.
  • Understanding resistance mechanisms may reveal new therapeutic strategies.

Purpose of the Study:

  • To investigate the role of copper transport in docetaxel resistance in mPCa.
  • To identify potential therapeutic targets to overcome docetaxel resistance.
  • To evaluate the efficacy of disulfiram and copper in combination with docetaxel.

Main Methods:

  • Analysis of copper uptake and ATP7B expression in docetaxel-resistant mPCa cell lines.
  • siRNA-mediated knockdown of ATP7B to assess docetaxel sensitivity.
  • Correlation of ATP7B deletions with patient survival in mPCa.
  • In vivo studies using docetaxel-resistant xenograft models treated with disulfiram, copper, and docetaxel.
  • Western blot analysis to determine protein level changes.

Main Results:

  • Docetaxel-resistant mPCa cells showed reduced copper uptake and increased ATP7B expression.
  • ATP7B knockdown sensitized resistant cells to docetaxel.
  • ATP7B deletions in patients correlated with improved survival post-chemotherapy.
  • Disulfiram and copper combination enhanced docetaxel's antitumor effects in vivo.
  • DSF and copper modulated levels of COMMD1, Skp2, clusterin, and p21/WAF1 via ATP7B.

Conclusions:

  • Copper exporter ATP7B plays a crucial role in docetaxel resistance in mPCa.
  • Targeting ATP7B or utilizing disulfiram and copper represents a potential strategy to enhance docetaxel therapy.
  • This study reveals a copper-dependent vulnerability in docetaxel-resistant prostate cancer.

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