Abstract
Computational toxicology is a sub-discipline of toxicology concerned with the development and use of computer-based models and methodology to understand and predict chemical toxicity in a biological system (e.g., cells and organisms). Quantitative structure–activity relationship (QSAR) has been the predominant approach in computational toxicology. However, classical QSAR methodology has often suffered from low prediction accuracy, largely owing to the lack or non-integration of toxicological mechanisms. To address this lingering problem, we have developed a novel in silico toxicology approach that is based on molecular modeling and guided by mode of action (MoA). Our approach is implemented through a target-specific toxicity knowledgebase (TsTKb), consisting of a pre-categorized database of chemical MoA (ChemMoA) and a series of pre-built, category-specific classification and quantification models. ChemMoA serves as the depository of chemicals with known MoAs or molecular initiating events (i.e., known target biomacromolecules) and quantitative information for measured toxicity endpoints (if available). The models allow a user to qualitatively classify an uncharacterized chemical by MoA and quantitatively predict its toxicity potency. This approach is currently under development and will evolve to incorporate physiologically based pharmacokinetic (PBPK) modeling to address absorption, distribution, metabolism and excretion (ADME) processes in a biological system. The fully developed approach is believed to significantly advance in silico -based predictive toxicology and provide a new powerful toolbox for regulators, the chemical industry and the relevant academic communities.
Keywords
- Mode of action (MoA)
- Molecular dynamics (MD) simulation
- Molecular docking
- Deep learning
- Predictive toxicology
- Target-specific toxicity knowledgebase (TsTKb)
- Chemical mode of action database (ChemMoA)
- Qualitative classification
- Quantitative prediction
- Quantitative structure–activity relationship (QSAR)
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Abbreviations
- 3D:
-
Three-dimensional
- 3Rs:
-
Refine, reduce, and replace
- ACToR:
-
Aggregated Computational Toxicology Online Resource
- ADME:
-
Absorption, distribution, metabolism, and excretion
- AOP:
-
Adverse outcome pathway
- BLAST:
-
Basic local alignment search tool
- BPA:
-
Bisphenol A
- ChemMoA:
-
Chemical MoA
- DSSTox:
-
Distributed Structure-Searchable Toxicity
- dyPLID:
-
Dynamic protein–ligand interaction descriptors
- EADB:
-
Estrogenic Activity Database
- EDKB:
-
Endocrine Disruptor Knowledge Base
- EDSP:
-
Endocrine Disruptor Screening Program
- EPA:
-
Environmental Protection Agency
- EU:
-
European Union
- FDA:
-
Food and Drug Administration
- iPSC:
-
Induced Pluripotent Stem Cell
- LTKB:
-
Liver Toxicity Knowledge Base
- MD:
-
Molecular Dynamics
- MIE:
-
Molecular Initiating Event
- MMDB:
-
Molecular Modeling DataBase
- MoA:
-
Mode of Action
- NCBI:
-
National Center for Biotechnology Information
- NRC:
-
National Research Council
- OECD:
-
Organization for Economic Cooperation and Development
- PBPK:
-
Physiologically based pharmacokinetic
- PDB:
-
Protein Data Bank
- QSAR:
-
Quantitative structure–activity relationship
- RC:
-
Reference chemical
- REACH:
-
Registration, Evaluation, Authorization, and Restriction of Chemicals
- Risk21:
-
Risk Assessment in the twenty-first century
- SEURAT:
-
Safety Evaluation Ultimately Replacing Animal Testing
- SPLIF:
-
Structural protein–ligand interaction fingerprints
- T3DB:
-
Toxin and Toxin Target Database
- Tox21:
-
Toxicology in the twenty-first century
- ToxCast:
-
Toxicity Forecaster
- TsTKb:
-
Target-specific toxicity knowledgebase
- USDA:
-
US Department of Agriculture
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Gong, P. et al. (2019). Mode-of-Action-Guided, Molecular Modeling-Based Toxicity Prediction: A Novel Approach for In Silico Predictive Toxicology. In: Hong, H. (eds) Advances in Computational Toxicology. Challenges and Advances in Computational Chemistry and Physics, vol 30. Springer, Cham. https://doi.org/10.1007/978-3-030-16443-0_6
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