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Arsenic trioxide induces apoptosis in uveal melanoma cells through the mitochondrial pathway

Miao-Ju Chen1, Pei-Yu Yang, Yi-Zhen Ye

  • 1Department of Medical Research, Show Chwan Memorial Hospital, Changhua, Taiwan.

The American Journal of Chinese Medicine
|November 10, 2010
PubMed

Insights

Arsenic trioxide (ATO) effectively inhibits human uveal melanoma cell growth by inducing apoptosis. This occurs primarily through the mitochondria-dependent pathway, offering potential for improved clinical treatments.

Area of Science:

  • Oncology
  • Cell Biology
  • Pharmacology

Background:

  • Uveal melanoma is the most common primary intraocular malignancy in adults.
  • It exhibits high resistance to conventional chemotherapeutic agents.
  • Arsenic trioxide (ATO) shows promise in inhibiting ocular melanoma cell growth, but its mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the mechanisms of arsenic trioxide (ATO) in inhibiting human uveal melanoma cells.
  • To evaluate the dose- and time-dependent effects of ATO on uveal melanoma cell proliferation.
  • To elucidate the specific apoptotic pathway induced by ATO in uveal melanoma.

Main Methods:

  • MTT assay to assess cell proliferation and viability.
  • Measurement of apoptosis ratio via DNA fragmentation.
  • Analysis of caspase activities (caspase-3, -9, and -8).
  • Western blot analysis for key apoptosis-related proteins (Bax, Bcl-2, cytochrome c).

Main Results:

  • ATO demonstrated a stronger inhibiting effect on uveal melanoma (SP6.5) cell proliferation compared to human fibroblasts.
  • ATO treatment significantly increased the apoptosis ratio in SP6.5 cells (4.1- to 7.7-fold).
  • ATO elevated caspase-3 and caspase-9 activities, enhanced Bax and cytochrome c expression, and suppressed Bcl-2 expression.

Conclusions:

  • Arsenic trioxide (ATO) induces apoptosis in human uveal melanoma cells primarily through the mitochondrial pathway.
  • The study provides the first comprehensive evaluation of the mitochondria-dependent apoptotic pathway of ATO in uveal melanoma.
  • These findings suggest potential for enhancing the clinical efficacy of ATO for uveal melanoma treatment.

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