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G3139 induces cell death by caspase-dependent and -independent apoptosis on human melanoma cell lines

Shinnosuke Nakamura1, Madoka Inui, Takahiko Kamei

  • 1Department of Oral and Maxillofacial Surgery, Faculty of Medicine, Mie University, 2-174 Edobashi, Tsu, Mie 514-8507, Japan. shinno@clin.medic.mie-u.ac.jp

Oncology Reports
|May 11, 2006
PubMed

Insights

Antisense oligodeoxynucleotides (ODNs) like G3139 show anti-tumor effects by inducing apoptosis and reducing bcl-2 protein levels. G3139 demonstrates superior efficacy compared to G3622, highlighting targeted DNA reduction

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Pharmacology

Background:

  • The bcl-2 gene plays a crucial role in cell survival and is often overexpressed in various cancers, making it a target for therapeutic intervention.
  • Phosphorothioate oligodeoxynucleotides (ODNs) are being investigated as antisense agents to inhibit gene expression, with G3139 targeting the bcl-2 initiation codon.
  • While G3139 is in clinical trials, a comprehensive understanding of its mechanism of action and comparison with related ODNs like G3622 is needed.

Purpose of the Study:

  • To investigate the cell death mechanisms induced by the antisense ODN G3139 and the control ODN G3622 in melanoma cell lines.
  • To compare the anti-proliferative and apoptosis-inducing effects of G3139 and G3622.
  • To elucidate the role of caspase-dependent and independent pathways in ODN-induced apoptosis.

Main Methods:

  • Treatment of melanoma cell lines with G3139 and G3622.
  • Assessment of bcl-2 protein levels.
  • Analysis of cell proliferation and apoptosis induction.
  • Inhibition of apoptosis using a general caspase inhibitor (Z-VAD-fmk).
  • Tracking of apoptotic factors such as AIF (Apoptosis-Inducing Factor) localization.

Main Results:

  • G3139 effectively reduced bcl-2 protein levels, while both G3139 and G3622 inhibited cell proliferation and induced apoptosis.
  • G3139 exhibited a more potent anti-tumor effect compared to G3622.
  • Apoptosis induction by ODNs was partially caspase-independent, with AIF translocation from mitochondria to the nucleus observed.
  • The anti-tumor efficacy difference correlated with the reduction of target gene expression.

Conclusions:

  • Antisense ODNs, particularly G3139, can induce apoptosis and inhibit proliferation in melanoma cells.
  • G3139 demonstrates superior anti-tumor activity over G3622, likely due to more effective targeting of bcl-2.
  • The observed apoptosis involves caspase-independent pathways, indicated by AIF translocation.
  • Targeting specific DNA sequences with antisense ODNs represents a promising strategy for anti-cancer chemotherapy.

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