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QSAR models for both mutagenic potency and activity: application to nitroarenes and aromatic amines
R Benigni1, C Andreoli, A Giuliani
1Laboratory of Comparative Toxicology and Ecotoxicology, Istituto Superiore di Sanità, Rome, Italy.
Environmental and Molecular Mutagenesis
|January 1, 1994
Summary
Molecular factors determine if chemicals are mutagenic. Electronic properties are key for initial activity, while hydrophobicity influences the potency of active compounds in bacterial mutagenicity tests.
Area of Science:
- Toxicology
- Medicinal Chemistry
- Computational Chemistry
Background:
- Chemicals like aromatic amines and nitroarenes can be mutagenic.
- Assessing mutagenicity is crucial for risk assessment.
- Quantitative Structure-Activity Relationships (QSAR) are used to predict chemical activity.
Purpose of the Study:
- To identify molecular determinants distinguishing mutagenic from inactive aromatic amines and nitroarenes.
- To compare QSAR for mutagenic potency versus yes/no activity.
- To analyze differences in QSAR between Salmonella strains TA98 and TA100.
Main Methods:
- Literature data on mutagenic activity in Salmonella typhimurium and Escherichia coli (SOS repair).
- Quantitative Structure-Activity Relationships (QSAR) analysis.
- Comparison of QSAR models for mutagenic potency and activity presence/absence.
Main Results:
- Hydrophobicity significantly impacts the potency of active mutagenic compounds.
- Electronic factors primarily differentiate active from inactive compounds.
- QSAR models for potency differ substantially from those for activity presence/absence.
Conclusions:
- Electronic factors are critical for a chemical's potential to be metabolized, while hydrophobicity governs the extent of activity.
- Understanding the distinct roles of electronic and hydrophobic factors is vital for QSAR development and risk assessment.
- Nonlinear relationships in QSAR for mutagenicity require careful consideration in studies and risk evaluations.