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Dioscin (saponin)-induced generation of reactive oxygen species through mitochondria dysfunction: a proteomic-based

Ying Wang1, Chi-Ming Che, Jen-Fu Chiu

  • 1Department of Chemistry, The University of Hong Kong, Hong Kong SAR, People's Republic of China.

Journal of Proteome Research
|November 3, 2007
PubMed

Insights

Dioscin, a saponin from traditional Chinese medicine, induces programmed cell death (apoptosis) in leukemia cells. This study reveals mitochondria dysfunction and altered protein expression are key mechanisms in dioscin

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Traditional Chinese Medicine

Background:

  • Saponins, including dioscin, are explored for anticancer potential.
  • The molecular mechanisms underlying their cytotoxic effects remain largely unelucidated.
  • Understanding these mechanisms is crucial for developing novel cancer therapies.

Purpose of the Study:

  • To investigate the cytotoxic effects of dioscin on human myeloblast leukemia HL-60 cells.
  • To elucidate the molecular pathways involved in dioscin-induced apoptosis.
  • To explore the role of proteomics in understanding the action of traditional Chinese medicine compounds.

Main Methods:

  • Proteomics analysis of HL-60 cells treated with dioscin.
  • Isolation and analysis of microsomal and plasma membrane proteins.
  • Biochemical assays to assess mitochondrial function and reactive oxygen species (ROS) generation.
  • Investigation of the mitochondrial transmembrane potential (ΔΨm) and apoptosis pathways.

Main Results:

  • Dioscin induced time-dependent apoptosis in HL-60 cells.
  • Proteomic analysis revealed significant alterations in chaperone and protein folding mediator expression.
  • Mitochondrial dysfunction and subsequent ROS generation were observed.
  • Aristolochic acid partially inhibited dioscin-induced apoptosis, implicating mitochondria.

Conclusions:

  • Dioscin effectively induces apoptosis in leukemia cells.
  • Mitochondria-initiated apoptosis pathways are critical to dioscin's cytotoxic action.
  • This study provides molecular evidence for dioscin's potential as an anticancer agent.

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