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Inhibition of glutathione synthesis reverses Krüppel-like factor 4-mediated cisplatin resistance

Yongsheng Jia1, Wenjian Zhang, Honglin Liu

  • 1Graduate School, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, People's Republic of China.

Cancer Chemotherapy and Pharmacology
|August 12, 2011
PubMed
Abstract

Insights

Krüppel-like factor 4 (KLF4) enhances resistance to cisplatin chemotherapy in liver cancer cells by increasing glutathione levels. This finding offers potential new strategies for overcoming cisplatin resistance in hepatocarcinoma treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Hepatocellular carcinoma (HCC) remains a significant health challenge.
  • Cisplatin is a widely used chemotherapy drug, but resistance is a major limitation.
  • Cancer stem-like cells (CSCs) are implicated in chemoresistance and tumor recurrence.

Purpose of the Study:

  • To investigate the role of Krüppel-like factor 4 (KLF4) in cisplatin resistance in HCC.
  • To elucidate the underlying mechanisms of KLF4-mediated chemoresistance.

Main Methods:

  • Quantitative RT-PCR and Western blot to assess KLF4 expression.
  • Lentiviral vectors for KLF4 knockdown and overexpression in HCC cell lines.
  • MTT assays for cell viability and TUNEL staining for DNA damage.
  • Enzymatic assays for glutathione content and RT-PCR for γ-glutamylcysteine synthetase expression.

Main Results:

  • Higher KLF4 levels correlated with increased resistance to cisplatin in HCC stem-like cells (T3A-A3) compared to HepG2 cells.
  • KLF4 knockdown reduced cisplatin resistance, while its overexpression enhanced resistance and DNA damage protection.
  • KLF4 overexpression significantly increased intracellular glutathione levels and the expression of γ-glutamylcysteine synthetase.
  • Inhibition of glutathione synthesis by buthionine sulfoximine abolished KLF4-mediated cisplatin resistance.

Conclusions:

  • KLF4 plays a crucial role in regulating cellular sensitivity to cisplatin in HCC.
  • KLF4 confers cisplatin resistance by upregulating intracellular glutathione synthesis.
  • Targeting KLF4 or glutathione pathways may offer therapeutic strategies against cisplatin-resistant HCC.

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