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Cytotoxic effect of three arsenic compounds in HeLa human tumor and bacterial cells
F I Abdullaev1, R Rivera-Luna, A García-Carrancá
1Laboratorio Oncologia Experimental, Instituto Nacional de Pediatría, Insurgentes Sur 3700-C, Torre de Investigation, 6 piso, 04530 México D.F., Mexico. fikrat@servidor.unam.mx
Abstract:
Numerous epidemiological studies suggest that arsenic (As) compounds are carcinogens, however, recent data have renewed the interest in their anticarcinogenic properties. The cytotoxic effects of three arsenic compounds were assessed: sodium arsenite, sodium arsenate and sodium cacodylate, representing the trivalent and pentavalent species of arsenic, along with a dimethylated pentavalent arsenic species. HeLa cells and Salmonella typhimurium (strains TA98 and TA100) were exposed to As compounds and the cytotoxic effects were evaluated. Alterations on RNA and DNA synthesis in HeLa cells were also examined. All arsenic compounds produced a dose-dependent inhibition on colony formation and DNA synthesis in HeLa cells, yet any of them significantly influenced RNA synthesis in these cells. No evidence of arsenic-induced mutagenicity or antimutagenicity was observed using the Ames assay. In bacterial cells, only sodium arsenite caused a dose-dependent inhibition of colony formation.Collectively, these results indicate that in both, HeLa and S. typhimurium cell systems, only trivalent sodium arsenite can act as an effective inhibitor of cell growth. The possible mechanism(s) of the cytotoxic effect of arsenite in these two different cell systems might be due to its reactivity with intracellular sulfhydryl groups.
Insights
Trivalent arsenic compounds, like sodium arsenite, inhibit cell growth in human and bacterial cells. This study investigated arsenic
Area of Science:
- Toxicology
- Cell Biology
- Molecular Biology
Background:
- Epidemiological studies link arsenic (As) compounds to carcinogenicity.
- Recent research suggests potential anticarcinogenic properties of arsenic.
- Understanding arsenic's cytotoxic effects is crucial for risk assessment and therapeutic development.
Purpose of the Study:
- To evaluate the cytotoxic effects of trivalent and pentavalent arsenic compounds on human (HeLa) and bacterial (Salmonella typhimurium) cells.
- To investigate the impact of arsenic compounds on RNA and DNA synthesis in HeLa cells.
- To assess the mutagenic or antimutagenic potential of arsenic compounds using the Ames assay.
Main Methods:
- Cytotoxicity assessment of sodium arsenite, sodium arsenate, and sodium cacodylate using HeLa cells and S. typhimurium strains TA98 and TA100.
- Evaluation of RNA and DNA synthesis alterations in HeLa cells following arsenic compound exposure.
- Mutagenicity and antimutagenicity testing via the Ames assay.
Main Results:
- All tested arsenic compounds inhibited colony formation and DNA synthesis in HeLa cells in a dose-dependent manner.
- No significant effect on RNA synthesis was observed in HeLa cells treated with arsenic compounds.
- Sodium arsenite was the only compound to show dose-dependent inhibition of colony formation in bacterial cells.
- No mutagenic or antimutagenic effects were detected in the Ames assay.
Conclusions:
- Trivalent sodium arsenite effectively inhibits cell growth in both human and bacterial cell systems.
- The cytotoxic mechanism of arsenite may involve its reactivity with intracellular sulfhydryl groups.
- Arsenic compounds exhibit differential cytotoxic effects depending on their chemical species and cellular context.
