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Inducation of chromosomal aberrations in cultured mammalian cells by nickel compounds
Abstract:
The effects of 4 Ni compounds, nickel chloride, nickel acetate, potassium cyanonickelate, and nickel sulfide were studied in a line of mammary carcinoma cells from the C3H mouse. All 4 were easily taken up by the cells and reacted with protein, RNA, and possibly DNA. Measurements of leucine, uridine, and thymidine uptake during exposure showed that the syntheses of protein and DNA were more sensitive than RNA. Chromosomal aberrations were observed during the recovery period following the end of the treament with Ni. The implications of these results were discussed with respect to the carcinogenicity of the compounds and to the recommended protocols for mutagenicity testing by chromosomal aberrations.
Insights
Nickel compounds readily entered mouse mammary carcinoma cells, impacting protein and DNA synthesis. Exposure led to chromosomal damage, suggesting potential carcinogenicity and informing mutagenicity testing protocols.
Area of Science:
- Toxicology
- Cell Biology
- Genetics
Background:
- Nickel compounds are environmental contaminants with known toxicological effects.
- Understanding the cellular mechanisms of nickel toxicity is crucial for risk assessment.
- Mammary carcinoma cell lines provide a model for studying chemical carcinogenesis.
Purpose of the Study:
- To investigate the cellular effects of four nickel compounds: nickel chloride, nickel acetate, potassium cyanonickelate, and nickel sulfide.
- To assess the impact of these compounds on cellular macromolecule synthesis (protein, RNA, DNA).
- To evaluate the potential for nickel compounds to induce chromosomal aberrations.
Main Methods:
- Exposure of C3H mouse mammary carcinoma cells to four nickel compounds.
- Measurement of leucine, uridine, and thymidine uptake to assess macromolecule synthesis.
- Microscopic examination of cells for chromosomal aberrations during the recovery phase post-exposure.
Main Results:
- All four nickel compounds were readily absorbed by the cells.
- Nickel compounds interacted with cellular protein, RNA, and potentially DNA.
- Protein and DNA synthesis were more sensitive to nickel exposure than RNA synthesis.
- Chromosomal aberrations were observed in cells after nickel treatment.
Conclusions:
- Nickel compounds exhibit significant cellular toxicity, affecting macromolecule synthesis and inducing genetic damage.
- The observed chromosomal aberrations suggest a potential role for these nickel compounds in carcinogenesis.
- Findings support the use of chromosomal aberration assays in mutagenicity testing protocols for nickel compounds.