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Human developmental toxicity and mutagenesis
H S Rosenkranz1, Y P Zhang, O T Macina
1Department of Environmental and Occupational Health University of Pittsburgh, Pittsburgh, PA 15238, USA.rsnkranz@vms.cis.pitt.edu
Abstract:
A previously described SAR model of human developmental toxicity was analyzed further. The model shows a number of mechanistic similarities with SAR models of other toxicological phenomena (systemic toxicity, chromosomal and genomic effects). This implies that there are many targets associated with developmental effects. Surprisingly the analyses revealed no significant mechanistic overlap between developmental toxicity in humans and mutagenicity in Salmonella, a surrogate for the occurrence of point mutations. Our study indicates that this lack of similarity is likely the result of the pre-screening strategies which largely eliminate Salmonella mutagens from among the therapeutics introduced into human medicine.
Insights
This study analyzed a human developmental toxicity model, finding mechanistic links to other toxicities but surprisingly no overlap with Salmonella mutagenicity due to pre-screening methods.
Area of Science:
- Toxicology
- Drug Development
- Mechanistic Toxicology
Background:
- Structure-Activity Relationship (SAR) models are crucial for predicting chemical toxicity.
- Human developmental toxicity is a complex endpoint with multiple potential molecular targets.
- Previous SAR models have shown overlaps across various toxicological phenomena.
Purpose of the Study:
- To further analyze a SAR model for human developmental toxicity.
- To investigate mechanistic similarities and differences with other toxicological endpoints.
- To understand the relationship between developmental toxicity and mutagenicity.
Main Methods:
- Analysis of an existing SAR model for human developmental toxicity.
- Comparative analysis of mechanistic similarities with SAR models for systemic toxicity, chromosomal, and genomic effects.
- Comparative analysis of mechanistic overlap with mutagenicity in Salmonella.
Main Results:
- The developmental toxicity SAR model shares mechanistic similarities with models for systemic toxicity, chromosomal, and genomic effects.
- There was a surprising lack of significant mechanistic overlap between human developmental toxicity and Salmonella mutagenicity.
- This lack of overlap is potentially explained by pre-screening strategies eliminating Salmonella mutagens from therapeutics.
Conclusions:
- Human developmental toxicity involves multiple targets, sharing mechanistic pathways with other toxicological effects.
- The Ames test (Salmonella mutagenicity assay) may not adequately capture developmental toxicants due to drug pre-screening.
- Further refinement of predictive toxicology models is needed to account for specific toxicological endpoints and drug development pipelines.