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Area of Science:

  • Oncology
  • Cancer Biology
  • Metastasis Research

Background:

  • Ferroptosis induction is a promising cancer therapy strategy using small-molecule modulators.
  • Glutathione peroxidase 4 (GPX4) inhibitors (e.g., RSL3, ML210) induce ferroptosis by neutralizing lipid peroxides.
  • Limited knowledge exists on GPX4-inhibitor resistance's role in cancer metastasis.

Purpose of the Study:

  • To investigate the metastatic potential of cancer cells adapted to GPX4 inhibition.
  • To characterize metabolic and phenotypic changes in GPX4-inhibitor-resistant (GPX4i) cancer cells.

Main Methods:

  • Triple-negative breast cancer cell lines (M231, 4T1) were cultured with GPX4 inhibitors to generate resistant cell lines (GPX4i).
  • Metabolic and lipidomic profiles of tumors derived from GPX4i-resistant cells and parental cells were analyzed.
  • Changes in epithelial-like markers (vimentin, EpCAM) were assessed.
  • Spontaneous and intravenous metastasis models were used to evaluate metastatic burden.

Main Results:

  • GPX4i-resistant tumors exhibited distinct metabolic and lipidomic profiles compared to parental tumors.
  • Resistance to GPX4 inhibitors induced a shift towards an epithelial-like state (decreased vimentin, increased EpCAM).
  • GPX4i-resistant cells formed fewer spontaneous metastases from primary tumors.
  • No significant difference in overall metastatic burden was observed upon intravenous injection.

Conclusions:

  • Long-term in vitro exposure to GPX4 inhibitors induces significant alterations in cancer cell phenotypes.
  • GPX4 inhibitor resistance influences the metastatic behavior of cancer cells, particularly spontaneous metastasis.
  • These findings highlight the complex interplay between ferroptosis resistance and cancer dissemination.