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Suicidal oxidative stress induced by certain antioxidants
Ligy Koshy1, B S Dwarakanath, H G Raj
1Division of Biocybernetics and Radiopharmaceuticals, Institute of Nuclear Medicine and Allied Sciences, Timarpur, Delhi 110 054, India.
Indian Journal of Experimental Biology
|August 31, 2004
Summary
Certain antioxidants, including coumarins and flavonoids, exhibit pro-oxidant effects, inducing oxidative stress and cell death in human tumor cells. These compounds show differential sensitivity in breast carcinoma versus glioma cell lines.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Antioxidants are widely recognized for their health benefits.
- However, some antioxidants can exert pro-oxidant effects under specific conditions.
- Investigating these dual roles is crucial for understanding their therapeutic potential and toxicity.
Purpose of the Study:
- To investigate the pro-oxidant effects of coumarins (DHMC, DAMC) and flavonoids (Q, QPA).
- To evaluate the impact of these compounds on human breast carcinoma (MDA-MB-468) and glioma (U-87MG) cell lines.
- To determine the mechanisms underlying drug-induced cell death.
Main Methods:
- Treatment of MDA-MB-468 and U-87MG cell lines with coumarins and flavonoids at 10 microM.
- Assessment of cell viability and proliferation using MTT assay.
- Quantification of reactive oxygen species (ROS) using DCFH-DA assay.
- Analysis of DNA content to detect apoptosis.
Main Results:
- MDA-MB-468 cells were more sensitive to DAMC, Q, and QPA than U-87MG cells; DHMC showed no toxicity.
- MTT assay indicated increased formazan production, suggesting enhanced free radical generation.
- DCFH-DA assay confirmed elevated ROS levels in treated cells.
- Increased hypodiploid DNA content suggested apoptotic cell death induction by DAMC, Q, and QPA.
Conclusions:
- The pro-oxidant activity of DAMC, Q, and QPA contributes to cell death in tumor cell lines.
- Oxidative stress induced by these compounds plays a key role in their cytotoxic effects.
- Differential sensitivity between cancer cell lines highlights the importance of context-dependent drug action.