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Testing of drugs for combined mutagenesis with sodium nitrite in the host-mediated assay
Abstract:
Mutagenic activity of the drugs analgine and aminophenazone was tested in the intraperitoneal and intrasanguine host-mediated assay after oral application together with equimolar doses of sodium nitrite. Salmonella typhimurium strain G46 was used as genetic indicator system; mice served as host animals for the bacteria. Analgine was found to be weakly mutagenic in the dose 2 mM/kg together with nitrite, aminophenazone was a strong mutagen in combination with nitrite in the doses 2 mM/kg and 0.2 mM/kg using the intrasanguine test with 1 h incubation of bacteria in the liver. In the intraperitoneal variant with 3 h incubation time of bacteria only aminophenazone was slightly mutagenic at the highest dose tested, 2 mM/kg. The relative nitrosation rate for aminophenazone was calculated by means of regression lines for mutagenic activity of dimethylnitrosamine and was found to be in the range of 2% in both systems for a dose of 2 mM/kg precursors.
Insights
The study investigated the mutagenic potential of analgine and aminophenazone when combined with sodium nitrite. Aminophenazone demonstrated significant mutagenic activity in the intrasanguine host-mediated assay, indicating a potential risk.
Area of Science:
- Pharmacology
- Toxicology
- Genetics
Background:
- The mutagenic potential of common pharmaceutical compounds requires thorough investigation.
- Drug-induced mutagenicity can arise from metabolic activation or interactions with endogenous substances like nitrites.
Purpose of the Study:
- To evaluate the mutagenic activity of analgine and aminophenazone when co-administered with sodium nitrite.
- To compare mutagenicity across different host-mediated assay systems and incubation times.
Main Methods:
- Host-mediated assays (intraperitoneal and intrasanguine) were employed using Salmonella typhimurium strain G46 as the indicator.
- Mice served as host animals, receiving oral administration of drugs and sodium nitrite.
- Mutagenic activity was assessed at varying drug doses and incubation times.
Main Results:
- Analgine showed weak mutagenicity at 2 mM/kg with nitrite in the intrasanguine test.
- Aminophenazone exhibited strong mutagenicity at 2 mM/kg and 0.2 mM/kg with nitrite in the intrasanguine test (1h liver incubation).
- Aminophenazone was only slightly mutagenic at the highest dose (2 mM/kg) in the intraperitoneal assay (3h incubation).
Conclusions:
- Aminophenazone poses a significant mutagenic risk when combined with nitrites, particularly in the intrasanguine host-mediated assay.
- The route of administration, incubation time, and dose significantly influence the observed mutagenic activity.
- Further research into the nitrosation rates and mechanisms of these drugs is warranted.