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A comparison of mutagenic and carcinogenic activities of aniline mustards
Abstract:
A set of 15 derivatives of aniline mustard (I) was tested to give a quantitative measure of mutagenicity in Salmonella typhimurium TA-1535 and TA-100 and also carcinogenicity as lung tumors in strain-A mice. The structural variation in the set was chosen to minimize collinearity between hydrophobic, electronic, and molar refractive properties. By these measures, there was not a direct relationship between mutagenicity and carcinogenicity; in fact, since the 4-OPh analogue ranked highest in mutagenicity and among the lowest in carcinogenicity, while the reverse was noted for the 3,5-(NHCONH2)2 analogue, an inverse relationship was marginally significant. S-9 activation was required in the Ames test using TA-100, and the dose-response curve, prior to toxicity, appeared biphasic.
Insights
This study found no direct link between mutagenicity and carcinogenicity in aniline mustards. Some compounds showed high mutagenicity but low carcinogenicity, suggesting a possible inverse relationship.
Area of Science:
- Toxicology
- Medicinal Chemistry
- Chemical Carcinogenesis
Background:
- Aniline mustards are a class of compounds with potential mutagenic and carcinogenic properties.
- Understanding the structure-activity relationships of these compounds is crucial for drug development and risk assessment.
- Previous studies have explored mutagenicity and carcinogenicity separately, but a direct comparison within a structured set is needed.
Purpose of the Study:
- To quantitatively assess the mutagenicity and carcinogenicity of 15 aniline mustard derivatives.
- To investigate the relationship between chemical structure and biological activity (mutagenicity and carcinogenicity).
- To determine if mutagenicity predicts carcinogenicity in this chemical series.
Main Methods:
- Mutagenicity testing using Salmonella typhimurium strains TA-1535 and TA-100 (Ames test).
- Carcinogenicity assessment in strain-A mice, measuring lung tumor formation.
- Quantitative structure-activity relationship (QSAR) analysis, minimizing collinearity between physicochemical properties.
Main Results:
- No direct correlation was observed between mutagenicity and carcinogenicity across the 15 derivatives.
- The 4-OPh analogue exhibited high mutagenicity but low carcinogenicity.
- The 3,5-(NHCONH2)2 analogue showed the opposite trend, with low mutagenicity and high carcinogenicity, suggesting a marginally significant inverse relationship.
- S-9 activation was necessary for mutagenicity in Salmonella typhimurium TA-100.
- A biphasic dose-response curve was observed before toxicity in the Ames test.
Conclusions:
- Mutagenicity in Salmonella typhimurium does not directly predict carcinogenicity for this set of aniline mustards.
- Chemical structure significantly influences both mutagenic and carcinogenic potential, with complex interplay.
- Further research is warranted to elucidate the mechanisms underlying the observed inverse relationship and biphasic responses.