Toxicology, 1. Fundamentals
Abstract
The article contains sections titled:
1. |
Introduction |
1.1. |
Definition and Scope |
1.2. |
Fields |
1.3. |
History |
1.4. |
Information Resources |
1.5. |
Terminology of Toxic Effects |
1.6. |
Types of Toxic Effects |
1.7. |
Dose-Response: a Fundamental Issue in Toxicology |
1.7.1. |
Graphics and Calculations |
1.8. |
Dose-Response Relationships for Cumulative Effects |
1.9. |
Factors Influencing Dose-Response |
1.9.1. |
Routes of Exposure |
1.9.2. |
Frequency of Exposure |
1.9.3. |
Species-Specific Differences in Toxicokinetics |
1.9.4. |
Miscellaneous Factors Influencing the Magnitude of Toxic Responses |
1.10. |
Exposure to Mixtures |
2. |
Absorption, Distribution, Biotransformation and Elimination of Xenobiotics |
2.1. |
Disposition of Xenobiotics |
2.2. |
Absorption |
2.2.1. |
Membranes |
2.2.2. |
Penetration of Membranes by Chemicals |
2.2.3. |
Mechanisms of Transport of Xenobiotics through Membranes |
2.2.4. |
Absorption |
2.2.4.1. |
Dermal Absorption |
2.2.4.2. |
Gastrointestinal Absorption |
2.2.4.3. |
Absorption of Xenobiotics by the Respiratory System |
2.3. |
Distribution of Xenobiotics by Body Fluids |
2.4. |
Storage of Xenobiotics in Organs and Tissues |
2.5. |
Biotransformation |
2.5.1. |
Phase-I and Phase-II Reactions |
2.5.2. |
Localization of the Biotransformation Enzymes |
2.5.3. |
Role of Biotransformation in Detoxication and Bioactivation |
2.5.4. |
Phase-I Enzymes and their Reactions |
2.5.4.1. |
Microsomal Monooxygenases: Cytochrome P450 |
2.5.4.2. |
Microsomal Monooxygenases: Flavin-Dependent Monooxygenases |
2.5.4.3. |
Peroxidative Biotransformation: Prostaglandin-synthase |
2.5.4.4. |
Nonmicrosomal Oxidations |
2.5.4.5. |
Hydrolytic Enzymes in Phase-I Biotransformation Reactions |
2.5.5. |
Phase-II Biotransformation Enzymes and their Reactions |
2.5.5.1. |
UDP-Glucuronyl Transferases |
2.5.5.2. |
Sulfate Conjugation |
2.5.5.3. |
Methyl Transferases |
2.5.5.4. |
N-Acetyl Transferases |
2.5.5.5. |
Amino Acid Conjugation |
2.5.5.6. |
Glutathione Conjugation of Xenobiotics and Mercapturic Acid Excretion |
2.5.6. |
Bioactivation of Xenobiotics |
2.5.6.1. |
Formation of Stable but Toxic Metabolites |
2.5.6.2. |
Biotransformation to Reactive Electrophiles |
2.5.6.3. |
Biotransformation of Xenobiotics to Radicals |
2.5.6.4. |
Formation of Reactive Oxygen Metabolites by Xenobiotics |
2.5.6.5. |
Detoxication and Interactions of Reactive Metabolites with Cellular Macromolecules |
2.5.6.6. |
Interaction of Reactive Intermediates with Cellular Macromolecules |
2.5.7. |
Factors Modifying Biotransformation and Bioactivation |
2.5.7.1. |
Host Factors Affecting Biotransformation |
2.5.7.2. |
Chemical-Related Factors that Influence Biotransformation |
2.5.8. |
Elimination of Xenobiotics and their Metabolites |
2.5.8.1. |
Renal Excretion |
2.5.8.2. |
Hepatic Excretion |
2.5.8.3. |
Xenobiotic Elimination by the Lungs |
2.6. |
Toxicokinetics |
2.6.1. |
Pharmacokinetic Models |
2.6.1.1. |
One-Compartment Model |
2.6.1.2. |
Two-Compartment Model |
2.6.2. |
Physiologically Based Pharmacokinetic Models |
3. |
Mechanisms of Acute and Chronic Toxicity and Mechanisms of Chemical Carcinogenesis |
3.1. |
Biochemical Basis of Toxicology |
3.2. |
Receptor-Ligand Interactions |
3.2.1. |
Basic Interactions |
3.2.2. |
Interference with Excitable Membrane Functions |
3.2.3. |
Interference of Xenobiotics with Oxygen Transport, Cellular Oxygen Utilization, and Energy Production |
3.3. |
Binding of Xenobiotics to Biomolecules |
3.3.1. |
Binding of Xenobiotics or their Metabolites to Cellular Proteins |
3.3.2. |
Interaction of Xenobiotics or their Metabolites with Lipid Constituents |
3.3.3. |
Interactions of Xenobiotics or their Metabolites with nucleic Acids |
3.4. |
Perturbation of Calcium Homeostasis by Xenobiotics or their Metabolites |
3.5. |
Nonlethal Genetic Alterations in Somatic Cells and Carcinogenesis |
3.6. |
DNA Structure and Function |
3.6.1. |
DNA Structure |
3.6.2. |
Transcription |
3.6.3. |
Translation |
3.6.4. |
Regulation of Gene Expression |
3.6.5. |
DNA Repair |
3.7. |
Molecular Mechanisms of Malignant Transformation and Tumor Formation |
3.7.1. |
Mutations |
3.7.2. |
Causal Link between Mutation and Cancer |
3.7.3. |
Proto-Oncogenes and Tumor-Suppressor Genes as Genetic Targets |
3.7.4. |
Genotoxic versus Nongenotoxic Mechanisms of Carcinogenesis |
3.8. |
Mechanisms of Chemically Induced Reproductive and Developmental Toxicity |
3.8.1. |
Embryotoxicity, Teratogenesis, and Transplacental Carcinogenesis |
3.8.2. |
Patterns of Dose-Response in Teratogenesis, Embryotoxicity, and Embryolethality |