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A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage
Published on: May 10, 2022
Copper-obatoclax derivative complexes mediate DNA cleavage and exhibit anti-cancer effects in hepatocellular
Jung-Chen Su1, Jung-Hua Chang1, Jui-Wen Huang2
1Institute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, Taiwan.
Abstract:
Obatoclax is an indole-pyrrole compound that induces cancer cell apoptosis through targeting the anti-apoptotic Bcl-2 protein family. Previously, we developed a series of obatoclax derivatives and studied their STAT3 inhibition-dependent activity against cancer cell lines. The obatoclax analog, prodigiosin, has been reported to mediate DNA cleavage in cancer cells by coordinating with copper complexes. To gain an understanding of copper-obatoclax complex activity, we applied obatoclax derivatives to examine their copper-mediated nuclease activity as a means to establish a basis for structure activity relationship. Replacement of the indole ring of obatoclax with furanyl, thiophenyl or Boc-indolyl rings reduced the DNA cleavage ability. The same effect was achieved through the replacement of the obatoclax pyrrolyl ring with thiazolidinedione and thioacetal. Among the compounds tested, we demonstrated that the complex of obatoclax or compound 7 with copper exhibited potent DNA strand scission which correlated with HCC cell growth inhibition.
Insights
We explored how obatoclax derivatives interact with copper to break cancer cell DNA. Certain modifications reduced DNA cleavage, but obatoclax-copper complexes showed potent activity against hepatocellular carcinoma (HCC) cell growth.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Cancer Research
Background:
- Obatoclax targets anti-apoptotic Bcl-2 proteins, inducing cancer cell apoptosis.
- Previous studies explored obatoclax derivatives for STAT3 inhibition in cancer.
- Prodigiosin, an obatoclax analog, cleaves cancer cell DNA via copper complexes.
Purpose of the Study:
- To investigate the copper-mediated nuclease activity of obatoclax derivatives.
- To establish a structure-activity relationship for copper-obatoclax complexes.
- To assess the anti-cancer effects of these complexes.
Main Methods:
- Synthesized and tested various obatoclax derivatives for DNA cleavage.
- Examined the effect of modifying the indole and pyrrole rings of obatoclax.
- Assessed the DNA strand scission activity of copper-obatoclax complexes.
- Correlated DNA cleavage with hepatocellular carcinoma (HCC) cell growth inhibition.
Main Results:
- Replacing the indole ring with furanyl, thiophenyl, or Boc-indolyl groups reduced DNA cleavage.
- Substituting the pyrrolyl ring with thiazolidinedione or thioacetal also decreased DNA cleavage.
- Complexes of obatoclax and compound 7 with copper demonstrated potent DNA strand scission.
- This DNA cleavage activity correlated with inhibition of HCC cell growth.
Conclusions:
- The indole and pyrrole moieties of obatoclax are crucial for its copper-mediated DNA cleavage activity.
- Copper complexes of obatoclax and specific derivatives exhibit significant nuclease activity.
- Obatoclax-copper complexes show promise for inhibiting hepatocellular carcinoma cell growth.
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