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Txr1: a transcriptional regulator of thrombospondin-1 that modulates cellular sensitivity to taxanes

Chih-Jian Lih1, Wensheng Wei, Stanley N Cohen

  • 1Department of Genetics, Stanford University School of Medicine, Stanford University, California 94305, USA.

Genes & Development
|July 19, 2006
PubMed

Insights

A new gene, txr1, helps prostate cancer cells resist taxane chemotherapy by reducing thrombospondin-1 (TSP-1) production. Targeting txr1 or TSP-1 could enhance taxane effectiveness.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Taxanes are crucial chemotherapeutic agents for various cancers, including prostate cancer.
  • Mechanisms of taxane resistance are not fully understood, limiting treatment efficacy.
  • Thrombospondin-1 (TSP-1) has known roles in angiogenesis and apoptosis, but its involvement in taxane resistance is unexplored.

Purpose of the Study:

  • To identify novel genes involved in taxane resistance in prostate cancer.
  • To elucidate the molecular mechanism by which txr1 confers taxane resistance.
  • To explore the therapeutic potential of targeting txr1 and TSP-1 in cancer treatment.

Main Methods:

  • Random gene expression perturbation using retrovirus-based promoters in human prostate cancer cells.
  • Isolation and characterization of taxane-resistant cell clones.
  • Analysis of gene expression, protein levels, apoptosis, and signaling pathways (including CD47).
  • Correlation analysis of txr1 and TSP-1 levels with taxol resistance across NCI-60 cancer cell lines.

Main Results:

  • Discovery of a previously uncharacterized gene, txr1, conferring taxane resistance.
  • txr1 down-regulates TSP-1 production, thereby inhibiting taxane-induced apoptosis.
  • Modulation of txr1 or TSP-1 levels impacts taxane sensitivity via CD47 receptor signaling.
  • Inverse correlation between txr1 and TSP-1 levels observed, linked to taxol resistance in multiple cancer cell lines.

Conclusions:

  • txr1 plays a significant role in taxane resistance by regulating TSP-1.
  • The txr1-TSP-1 axis, involving CD47 signaling, presents a novel mechanism of taxane resistance.
  • txr1 is a potential therapeutic target for overcoming taxane resistance in cancer treatment.

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