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The tumor suppressor SALL2 opposes chemotherapeutic resistance in breast cancer

Qiji Li1, Chenxin Li1, Yuhao Zhang1

  • 1The Seventh Affiliated Hospital, Sun Yat-Sen University, Shenzhen, 518107, China.

Molecular and Cellular Biochemistry
|November 21, 2024
PubMed

Insights

Downregulation of SALL2 expression in breast cancer promotes chemoresistance by inducing stem cell-like properties. This suggests SALL2 as a potential biomarker for predicting chemotherapy response in breast cancer patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Chemotherapy is a primary treatment for breast cancer, but resistance is a significant clinical challenge.
  • The molecular mechanisms driving chemotherapy resistance in breast cancer are not fully understood.
  • SALL2 (Sal-like protein 4) is a transcription factor with known roles in development and cancer.

Purpose of the Study:

  • To investigate the role of SALL2 in the development of chemoresistance in breast cancer.
  • To identify potential molecular mechanisms linking SALL2 to chemotherapy response.
  • To evaluate SALL2 as a prognostic biomarker for breast cancer patients undergoing chemotherapy.

Main Methods:

  • Analysis of SALL2 expression in chemo-resistant breast cancer tissues.
  • Investigation of SALL2 promoter methylation as a mechanism of downregulation.
  • Functional studies involving SALL2 silencing in breast cancer cells (in vitro and in vivo).
  • Assessment of SALL2's effect on stem cell-like phenotypes and cisplatin resistance.
  • Examination of SALL2's transcriptional regulation of BTG2.

Main Results:

  • A significant downregulation of SALL2 expression was observed in chemo-resistant breast cancer, linked to promoter methylation.
  • Reduced SALL2 expression correlated with poorer relapse-free survival in chemotherapy-treated patients.
  • SALL2 silencing induced stem cell-like characteristics and cisplatin resistance in breast cancer cells.
  • SALL2 directly binds to the promoter regions of BTG2, a negative regulator of stemness, influencing resistance.
  • SALL2 plays a critical role in modulating the response to cisplatin chemotherapy.

Conclusions:

  • SALL2 downregulation, driven by promoter methylation, contributes to chemoresistance in breast cancer.
  • SALL2 acts as a negative regulator of stemness and chemoresistance, partly through regulating BTG2.
  • SALL2 is a potential prognostic biomarker for chemotherapy response and relapse-free survival in breast cancer.
Keywords:
BTG2Breast cancerChemotherapyCisplatinMethylationSALL2

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