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Mutagenicity studies on tiopronin
Abstract:
alpha-Mercaptopropionylglycine (tiopronin, Mucolysin), a drug endowed with an interesting mucolytic activity, was tested for mutagenicity by means of the following in vitro and in vivo tests: mutagenesis on S. typhimurium with and without metabolic activation, genetic mutation on S. pombe P1 with and without metabolic activation, gene conversion on S. cerevisiae D4 with and without metabolic activation, urinary assay in the mouse with S. cerevisiae D4, host mediated assay in the mouse with S. cerevisiae D4 and micronucleus test in the mouse. On the basis of the results obtained tiopronin proved to be free of mutagenic activity.
Insights
Alpha-mercaptopropionylglycine (tiopronin) demonstrated no mutagenic activity in a comprehensive battery of in vitro and in vivo tests. This mucolytic drug is safe for genetic toxicity.
Area of Science:
- Pharmacology
- Toxicology
- Genetics
Background:
- Alpha-mercaptopropionylglycine (tiopronin) is recognized for its mucolytic properties.
- Assessing the mutagenicity of pharmaceutical compounds is crucial for drug safety.
Purpose of the Study:
- To evaluate the potential mutagenic activity of tiopronin.
- To determine if tiopronin poses a risk for genetic toxicity.
Main Methods:
- In vitro mutagenicity tests included bacterial reverse mutation assays (S. typhimurium) and yeast assays (S. cerevisiae, S. pombe) with and without metabolic activation.
- In vivo assessments comprised a mouse micronucleus test, a mouse urinary assay, and a mouse host-mediated assay.
Main Results:
- Tiopronin did not induce mutations in bacterial or yeast assays.
- No evidence of genotoxicity was observed in the in vivo mouse studies.
Conclusions:
- Tiopronin exhibits a lack of mutagenic activity across multiple in vitro and in vivo test systems.
- The findings support the safety profile of tiopronin regarding genetic toxicity.