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Dioscin sensitizes cells to TRAIL-induced apoptosis through downregulation of c-FLIP and Bcl-2

Yong-Sik Kim1, Eun-Ae Kim, Kyu-Gun Park

  • 1Department of Microbiology and Immunology, School of Medicine, Soonchunhyang University, Cheonan, Chungnam 330-090, Republic of Korea.

Oncology Reports
|August 17, 2012
PubMed

Insights

Dioscin enhances TRAIL-induced apoptosis in human renal cancer cells. This occurs by reducing levels of c-FLIPL and Bcl-2 proteins, key regulators of cell death.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Pharmacology

Background:

  • Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is a promising anticancer agent due to its selective induction of apoptosis in cancer cells.
  • Identifying novel therapeutic strategies to enhance TRAIL efficacy is crucial for improving cancer treatment outcomes.

Purpose of the Study:

  • To investigate the synergistic effect of dioscin and TRAIL on apoptosis induction in human renal cancer cells.
  • To elucidate the molecular mechanisms underlying dioscin's enhancement of TRAIL-induced apoptosis.

Main Methods:

  • Caki human renal cancer cells were co-treated with subtoxic doses of dioscin and TRAIL.
  • Western blotting was used to assess protein levels of c-FLIPL and Bcl-2.
  • N-acetylcysteine (NAC) pretreatment was employed to investigate the role of reactive oxygen species (ROS).

Main Results:

  • Dioscin and TRAIL co-treatment significantly induced apoptosis in Caki cells.
  • Dioscin downregulated c-FLIPL and Bcl-2 protein expression in a dose-dependent manner.
  • Dioscin's downregulation of c-FLIPL was partially dependent on ROS generation, while Bcl-2 downregulation occurred at the transcriptional level.

Conclusions:

  • Dioscin potentiates TRAIL-induced apoptosis in human renal cancer cells.
  • The mechanism involves the downregulation of anti-apoptotic proteins c-FLIPL and Bcl-2.
  • Dioscin represents a potential adjuvant therapy to enhance TRAIL-based cancer treatments.

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