- •CONTENTS
- •Preface
- •Contributors
- •1 Introduction to Toxicology
- •1.1 Definition and Scope, Relationship to Other Sciences, and History
- •1.1.2 Relationship to Other Sciences
- •1.1.3 A Brief History of Toxicology
- •1.3 Sources of Toxic Compounds
- •1.3.1 Exposure Classes
- •1.3.2 Use Classes
- •1.4 Movement of Toxicants in the Environment
- •Suggested Reading
- •2.1 Introduction
- •2.2 Cell Culture Techniques
- •2.2.1 Suspension Cell Culture
- •2.2.2 Monolayer Cell Culture
- •2.2.3 Indicators of Toxicity in Cultured Cells
- •2.3 Molecular Techniques
- •2.3.1 Molecular Cloning
- •2.3.2 cDNA and Genomic Libraries
- •2.3.3 Northern and Southern Blot Analyses
- •2.3.4 Polymerase Chain Reaction (PCR)
- •2.3.5 Evaluation of Gene Expression, Regulation, and Function
- •2.4 Immunochemical Techniques
- •Suggested Reading
- •3.1 Introduction
- •3.2 General Policies Related to Analytical Laboratories
- •3.2.1 Standard Operating Procedures (SOPs)
- •3.2.2 QA/QC Manuals
- •3.2.3 Procedural Manuals
- •3.2.4 Analytical Methods Files
- •3.2.5 Laboratory Information Management System (LIMS)
- •3.3 Analytical Measurement System
- •3.3.1 Analytical Instrument Calibration
- •3.3.2 Quantitation Approaches and Techniques
- •3.4 Quality Assurance (QA) Procedures
- •3.5 Quality Control (QC) Procedures
- •3.6 Summary
- •Suggested Reading
- •4 Exposure Classes, Toxicants in Air, Water, Soil, Domestic and Occupational Settings
- •4.1 Air Pollutants
- •4.1.1 History
- •4.1.2 Types of Air Pollutants
- •4.1.3 Sources of Air Pollutants
- •4.1.4 Examples of Air Pollutants
- •4.1.5 Environmental Effects
- •4.2 Water and Soil Pollutants
- •4.2.1 Sources of Water and Soil Pollutants
- •4.2.2 Examples of Pollutants
- •4.3 Occupational Toxicants
- •4.3.1 Regulation of Exposure Levels
- •4.3.2 Routes of Exposure
- •4.3.3 Examples of Industrial Toxicants
- •Suggested Reading
- •5 Classes of Toxicants: Use Classes
- •5.1 Introduction
- •5.2 Metals
- •5.2.1 History
- •5.2.2 Common Toxic Mechanisms and Sites of Action
- •5.2.3 Lead
- •5.2.4 Mercury
- •5.2.5 Cadmium
- •5.2.6 Chromium
- •5.2.7 Arsenic
- •5.2.8 Treatment of Metal Poisoning
- •5.3 Agricultural Chemicals (Pesticides)
- •5.3.1 Introduction
- •5.3.3 Organochlorine Insecticides
- •5.3.4 Organophosphorus Insecticides
- •5.3.5 Carbamate Insecticides
- •5.3.6 Botanical Insecticides
- •5.3.7 Pyrethroid Insecticides
- •5.3.8 New Insecticide Classes
- •5.3.9 Herbicides
- •5.3.10 Fungicides
- •5.3.11 Rodenticides
- •5.3.12 Fumigants
- •5.3.13 Conclusions
- •5.4 Food Additives and Contaminants
- •5.5 Toxins
- •5.5.1 History
- •5.5.2 Microbial Toxins
- •5.5.3 Mycotoxins
- •5.5.4 Algal Toxins
- •5.5.5 Plant Toxins
- •5.5.6 Animal Toxins
- •5.6 Solvents
- •5.7 Therapeutic Drugs
- •5.8 Drugs of Abuse
- •5.9 Combustion Products
- •5.10 Cosmetics
- •Suggested Reading
- •6 Absorption and Distribution of Toxicants
- •6.1 Introduction
- •6.2 Cell Membranes
- •6.3 Mechanisms of Transport
- •6.3.1 Passive Diffusion
- •6.4 Physicochemical Properties Relevant to Diffusion
- •6.4.1 Ionization
- •6.5 Routes of Absorption
- •6.5.1 Extent of Absorption
- •6.5.2 Gastrointestinal Absorption
- •6.5.3 Dermal Absorption
- •6.5.4 Respiratory Penetration
- •6.6 Toxicant Distribution
- •6.6.1 Physicochemical Properties and Protein Binding
- •6.7 Toxicokinetics
- •Suggested Reading
- •7 Metabolism of Toxicants
- •7.1 Introduction
- •7.2 Phase I Reactions
- •7.2.4 Nonmicrosomal Oxidations
- •7.2.5 Cooxidation by Cyclooxygenases
- •7.2.6 Reduction Reactions
- •7.2.7 Hydrolysis
- •7.2.8 Epoxide Hydration
- •7.2.9 DDT Dehydrochlorinase
- •7.3 Phase II Reactions
- •7.3.1 Glucuronide Conjugation
- •7.3.2 Glucoside Conjugation
- •7.3.3 Sulfate Conjugation
- •7.3.4 Methyltransferases
- •7.3.7 Acylation
- •7.3.8 Phosphate Conjugation
- •Suggested Reading
- •8 Reactive Metabolites
- •8.1 Introduction
- •8.2 Activation Enzymes
- •8.3 Nature and Stability of Reactive Metabolites
- •8.4 Fate of Reactive Metabolites
- •8.4.1 Binding to Cellular Macromolecules
- •8.4.2 Lipid Peroxidation
- •8.4.3 Trapping and Removal: Role of Glutathione
- •8.5 Factors Affecting Toxicity of Reactive Metabolites
- •8.5.1 Levels of Activating Enzymes
- •8.5.2 Levels of Conjugating Enzymes
- •8.5.3 Levels of Cofactors or Conjugating Chemicals
- •8.6 Examples of Activating Reactions
- •8.6.1 Parathion
- •8.6.2 Vinyl Chloride
- •8.6.3 Methanol
- •8.6.5 Carbon Tetrachloride
- •8.6.8 Acetaminophen
- •8.6.9 Cycasin
- •8.7 Future Developments
- •Suggested Reading
- •9.1 Introduction
- •9.2 Nutritional Effects
- •9.2.1 Protein
- •9.2.2 Carbohydrates
- •9.2.3 Lipids
- •9.2.4 Micronutrients
- •9.2.5 Starvation and Dehydration
- •9.2.6 Nutritional Requirements in Xenobiotic Metabolism
- •9.3 Physiological Effects
- •9.3.1 Development
- •9.3.2 Gender Differences
- •9.3.3 Hormones
- •9.3.4 Pregnancy
- •9.3.5 Disease
- •9.3.6 Diurnal Rhythms
- •9.4 Comparative and Genetic Effects
- •9.4.1 Variations Among Taxonomic Groups
- •9.4.2 Selectivity
- •9.4.3 Genetic Differences
- •9.5 Chemical Effects
- •9.5.1 Inhibition
- •9.5.2 Induction
- •9.5.3 Biphasic Effects: Inhibition and Induction
- •9.6 Environmental Effects
- •9.7 General Summary and Conclusions
- •Suggested Reading
- •10 Elimination of Toxicants
- •10.1 Introduction
- •10.2 Transport
- •10.3 Renal Elimination
- •10.4 Hepatic Elimination
- •10.4.2 Active Transporters of the Bile Canaliculus
- •10.5 Respiratory Elimination
- •10.6 Conclusion
- •Suggested Reading
- •11 Acute Toxicity
- •11.1 Introduction
- •11.2 Acute Exposure and Effect
- •11.3 Dose-response Relationships
- •11.4 Nonconventional Dose-response Relationships
- •11.5 Mechanisms of Acute Toxicity
- •11.5.1 Narcosis
- •11.5.2 Acetylcholinesterase Inhibition
- •11.5.3 Ion Channel Modulators
- •11.5.4 Inhibitors of Cellular Respiration
- •Suggested Reading
- •12 Chemical Carcinogenesis
- •12.1 General Aspects of Cancer
- •12.2 Human Cancer
- •12.2.1 Causes, Incidence, and Mortality Rates of Human Cancer
- •12.2.2 Known Human Carcinogens
- •12.3 Classes of Agents Associated with Carcinogenesis
- •12.3.2 Epigenetic Agents
- •12.4 General Aspects of Chemical Carcinogenesis
- •12.5 Initiation-Promotion Model for Chemical Carcinogenesis
- •12.6 Metabolic Activation of Chemical Carcinogens and DNA Adduct Formation
- •12.7 Oncogenes
- •12.8 Tumor Suppressor Genes
- •12.8.1 Inactivation of Tumor Suppressor Genes
- •12.8.2 p53 Tumor Suppressor Gene
- •12.9 General Aspects of Mutagenicity
- •12.10 Usefulness and Limitations of Mutagenicity Assays for the Identification of Carcinogens
- •Suggested Reading
- •13 Teratogenesis
- •13.1 Introduction
- •13.2 Principles of Teratology
- •13.3 Mammalian Embryology Overview
- •13.4 Critical Periods
- •13.5 Historical Teratogens
- •13.5.1 Thalidomide
- •13.5.2 Accutane (Isotetrinoin)
- •13.5.3 Diethylstilbestrol (DES)
- •13.5.4 Alcohol
- •13.6 Testing Protocols
- •13.6.1 FDA Guidelines for Reproduction Studies for Safety Evaluation of Drugs for Human Use
- •13.6.3 Alternative Test Methods
- •13.7 Conclusions
- •Suggested Reading
- •14 Hepatotoxicity
- •14.1 Introduction
- •14.1.1 Liver Structure
- •14.1.2 Liver Function
- •14.2 Susceptibility of the Liver
- •14.3 Types of Liver Injury
- •14.3.1 Fatty Liver
- •14.3.2 Necrosis
- •14.3.3 Apoptosis
- •14.3.4 Cholestasis
- •14.3.5 Cirrhosis
- •14.3.6 Hepatitis
- •14.3.7 Oxidative Stress
- •14.3.8 Carcinogenesis
- •14.4 Mechanisms of Hepatotoxicity
- •14.5 Examples of Hepatotoxicants
- •14.5.1 Carbon Tetrachloride
- •14.5.2 Ethanol
- •14.5.3 Bromobenzene
- •14.5.4 Acetaminophen
- •14.6 Metabolic Activation of Hepatotoxicants
- •Suggested Reading
- •15 Nephrotoxicity
- •15.1 Introduction
- •15.1.1 Structure of the Renal System
- •15.1.2 Function of the Renal System
- •15.2 Susceptibility of the Renal System
- •15.3 Examples of Nephrotoxicants
- •15.3.1 Metals
- •15.3.2 Aminoglycosides
- •15.3.3 Amphotericin B
- •15.3.4 Chloroform
- •15.3.5 Hexachlorobutadiene
- •Suggested Reading
- •16 Toxicology of the Nervous System
- •16.1 Introduction
- •16.2 The Nervous system
- •16.2.1 The Neuron
- •16.2.2 Neurotransmitters and their Receptors
- •16.2.3 Glial Cells
- •16.3 Toxicant Effects on the Nervous System
- •16.3.1 Structural Effects of Toxicants on Neurons
- •16.3.2 Effects of Toxicants on Other Cells
- •16.4 Neurotoxicity Testing
- •16.4.1 In vivo Tests of Human Exposure
- •16.4.2 In vivo Tests of Animal Exposure
- •16.4.3 In vitro Neurochemical and Histopathological End Points
- •16.5 Summary
- •Suggested Reading
- •17 Endocrine System
- •17.1 Introduction
- •17.2 Endocrine System
- •17.2.1 Nuclear Receptors
- •17.3 Endocrine Disruption
- •17.3.1 Hormone Receptor Agonists
- •17.3.2 Hormone Receptor Antagonists
- •17.3.3 Organizational versus Activational Effects of Endocrine Toxicants
- •17.3.4 Inhibitors of Hormone Synthesis
- •17.3.5 Inducers of Hormone Clearance
- •17.3.6 Hormone Displacement from Binding Proteins
- •17.4 Incidents of Endocrine Toxicity
- •17.4.1 Organizational Toxicity
- •17.4.2 Activational Toxicity
- •17.4.3 Hypothyroidism
- •17.5 Conclusion
- •Suggested Reading
- •18 Respiratory Toxicity
- •18.1 Introduction
- •18.1.1 Anatomy
- •18.1.2 Cell Types
- •18.1.3 Function
- •18.2 Susceptibility of the Respiratory System
- •18.2.1 Nasal
- •18.2.2 Lung
- •18.3 Types of Toxic Response
- •18.3.1 Irritation
- •18.3.2 Cell Necrosis
- •18.3.3 Fibrosis
- •18.3.4 Emphysema
- •18.3.5 Allergic Responses
- •18.3.6 Cancer
- •18.3.7 Mediators of Toxic Responses
- •18.4 Examples of Lung Toxicants Requiring Activation
- •18.4.1 Introduction
- •18.4.2 Monocrotaline
- •18.4.3 Ipomeanol
- •18.4.4 Paraquat
- •18.5 Defense Mechanisms
- •Suggested Reading
- •19 Immunotoxicity
- •19.1 Introduction
- •19.2 The Immune System
- •19.3 Immune Suppression
- •19.4 Classification of Immune-Mediated Injury (Hypersensitivity)
- •19.5 Effects of Chemicals on Allergic Disease
- •19.5.1 Allergic Contact Dermatitis
- •19.5.2 Respiratory Allergens
- •19.5.3 Adjuvants
- •19.6 Emerging Issues: Food Allergies, Autoimmunity, and the Developing Immune System
- •Suggested Reading
- •20 Reproductive System
- •20.1 Introduction
- •20.2 Male Reproductive Physiology
- •20.3 Mechanisms and Targets of Male Reproductive Toxicants
- •20.3.1 General Mechanisms
- •20.3.2 Effects on Germ Cells
- •20.3.3 Effects on Spermatogenesis and Sperm Quality
- •20.3.4 Effects on Sexual Behavior
- •20.3.5 Effects on Endocrine Function
- •20.4 Female Reproductive Physiology
- •20.5 Mechanisms and Targets of Female Reproductive Toxicants
- •20.5.1 Tranquilizers, Narcotics, and Social Drugs
- •20.5.2 Endocrine Disruptors (EDs)
- •20.5.3 Effects on Germ Cells
- •20.5.4 Effects on the Ovaries and Uterus
- •20.5.5 Effects on Sexual Behavior
- •Suggested Reading
- •21 Toxicity Testing
- •21.1 Introduction
- •21.2 Experimental Administration of Toxicants
- •21.2.1 Introduction
- •21.2.2 Routes of Administration
- •21.3 Chemical and Physical Properties
- •21.4 Exposure and Environmental Fate
- •21.5 In vivo Tests
- •21.5.1 Acute and Subchronic Toxicity Tests
- •21.5.2 Chronic Tests
- •21.5.3 Reproductive Toxicity and Teratogenicity
- •21.5.4 Special Tests
- •21.6 In vitro and Other Short-Term Tests
- •21.6.1 Introduction
- •21.6.2 Prokaryote Mutagenicity
- •21.6.3 Eukaryote Mutagenicity
- •21.6.4 DNA Damage and Repair
- •21.6.5 Chromosome Aberrations
- •21.6.6 Mammalian Cell Transformation
- •21.6.7 General Considerations and Testing Sequences
- •21.7 Ecological Effects
- •21.7.1 Laboratory Tests
- •21.7.2 Simulated Field Tests
- •21.7.3 Field Tests
- •21.8 Risk Analysis
- •21.9 The Future of Toxicity Testing
- •Suggested Reading
- •22 Forensic and Clinical Toxicology
- •22.1 Introduction
- •22.2 Foundations of Forensic Toxicology
- •22.3 Courtroom Testimony
- •22.4.1 Documentation Practices
- •22.4.2 Considerations for Forensic Toxicological Analysis
- •22.4.3 Drug Concentrations and Distribution
- •22.5 Laboratory Analyses
- •22.5.1 Colorimetric Screening Tests
- •22.5.2 Thermal Desorption
- •22.5.6 Enzymatic Immunoassay
- •22.6 Analytical Schemes for Toxicant Detection
- •22.7 Clinical Toxicology
- •22.7.1 History Taking
- •22.7.2 Basic Operating Rules in the Treatment of Toxicosis
- •22.7.3 Approaches to Selected Toxicoses
- •Suggested Reading
- •23 Prevention of Toxicity
- •23.1 Introduction
- •23.2 Legislation and Regulation
- •23.2.1 Federal Government
- •23.2.2 State Governments
- •23.2.3 Legislation and Regulation in Other Countries
- •23.3 Prevention in Different Environments
- •23.3.1 Home
- •23.3.2 Workplace
- •23.3.3 Pollution of Air, Water, and Land
- •23.4 Education
- •Suggested Reading
- •24 Human Health Risk Assessment
- •24.1 Introduction
- •24.2 Risk Assessment Methods
- •24.2.2 Exposure Assessment
- •24.2.3 Dose Response and Risk Characterization
- •24.3 Noncancer Risk Assessment
- •24.3.1 Default Uncertainty and Modifying Factors
- •24.3.2 Derivation of Developmental Toxicant RfD
- •24.3.3 Determination of RfD and RfC of Naphthalene with the NOAEL Approach
- •24.3.4 Benchmark Dose Approach
- •24.3.5 Determination of BMD and BMDL for ETU
- •24.3.6 Quantifying Risk for Noncarcinogenic Effects: Hazard Quotient
- •24.3.7 Chemical Mixtures
- •24.4 Cancer Risk Assessment
- •24.5 PBPK Modeling
- •Suggested Reading
- •25 Analytical Methods in Toxicology
- •25.1 Introduction
- •25.2 Chemical and Physical Methods
- •25.2.1 Sampling
- •25.2.2 Experimental Studies
- •25.2.3 Forensic Studies
- •25.2.4 Sample Preparation
- •25.2.6 Spectroscopy
- •25.2.7 Other Analytical Methods
- •Suggested Reading
- •26 Basics of Environmental Toxicology
- •26.1 Introduction
- •26.2 Environmental Persistence
- •26.2.1 Abiotic Degradation
- •26.2.2 Biotic Degradation
- •26.2.3 Nondegradative Elimination Processes
- •26.3 Bioaccumulation
- •26.4 Toxicity
- •26.4.1 Acute Toxicity
- •26.4.2 Mechanisms of Acute Toxicity
- •26.4.3 Chronic Toxicity
- •26.4.5 Abiotic and Biotic Interactions
- •26.5 Conclusion
- •Suggested Reading
- •27.1 Introduction
- •27.2 Sources of Toxicants to the Environment
- •27.3 Transport Processes
- •27.3.1 Advection
- •27.3.2 Diffusion
- •27.4 Equilibrium Partitioning
- •27.5 Transformation Processes
- •27.5.1 Reversible Reactions
- •27.5.2 Irreversible Reactions
- •27.6 Environmental Fate Models
- •Suggested Reading
- •28 Environmental Risk Assessment
- •28.1 Introduction
- •28.2 Formulating the Problem
- •28.2.1 Selecting Assessment End Points
- •28.2.2 Developing Conceptual Models
- •28.2.3 Selecting Measures
- •28.3 Analyzing Exposure and Effects Information
- •28.3.1 Characterizing Exposure
- •28.3.2 Characterizing Ecological Effects
- •28.4 Characterizing Risk
- •28.4.1 Estimating Risk
- •28.4.2 Describing Risk
- •28.5 Managing Risk
- •Suggested Reading
- •29 Future Considerations for Environmental and Human Health
- •29.1 Introduction
- •29.2 Risk Management
- •29.3 Risk Assessment
- •29.4 Hazard and Exposure Assessment
- •29.5 In vivo Toxicity
- •29.6 In vitro Toxicity
- •29.7 Biochemical and Molecular Toxicology
- •29.8 Development of Selective Toxicants
- •Glossary
- •Index
420 PREVENTION OF TOXICITY
small percentage increase may represent a large number of people when the whole population is considered. Furthermore chronic toxicity is not often reversible. Because in most industrialized countries laws already exist to control emission problems, if such problems exist in these countries, they are usually problems of enforcement.
One of the most critical areas for the prevention of toxicity caused by environmental contamination is that of disposal of hazardous wastes. It is now apparent that past practices in many industrialized countries have created large numbers of waste sites in which the waste is often unidentified, improperly stored, and leaching into the environment. The task of rectifying these past errors is an enormous one just now being addressed.
The ideal situation for current and future practices is to reduce chemical waste to an irreducible minimum and then to place the remainder in secure storage. Waste reduction can be accomplished in many ways.
žRefine plant processes so that less waste is produced.
žRecycle waste into useful products.
žConcentrate wastes.
žIncinerate. The technology is available to incinerate essentially all waste to inorganic slag. Unfortunately, the technology is sophisticated and expensive. Inadequate incineration is itself a hazard because of the risk of generating dioxins and other toxicants and releasing them into the environment. Less complex and more easily maintained incinerators will be essential if this technology is to play a prominent role in waste reduction.
Safe storage for the remaining waste may be in dump sites or in above-ground storage. In either case such storage ideally should be properly sited, constructed, maintained, and monitored.
Because of the nature of commerce, probably none of these measures will be successful unless the laws, penalties, and incentives are manipulated in such a way as to make safe disposal more attractive economically than unsafe disposal.
23.4EDUCATION
Because chemicals, many of them hazardous, are an inevitable part of life in industrialized countries, education is probably the most important method for the prevention of toxicity. Unfortunately, it is also one of the most neglected. In a typical public debate concerning a possible chemical hazard, the principle protagonists tend to fall into two extreme groups. The “everything is OK” protagonists and the “ban it completely” protagonists. The media seldom seem to educate the public, usually serving only to add fuel to the flames.
The educational role of the toxicologist should be the voice of reason, presenting a balanced view of risks and benefits, and outlining alternatives whenever possible. The simple lesson that science deals not in certainty, but rather degrees of certitude, must be learned by all involved.
In terms of ongoing educational programs, there should be opportunities at all levels: elementary schools, high schools, university, adult education, and media education. Several approaches can be used to educate the general public in ideal situations:
SUGGESTED READING |
421 |
žElementary school. Teach the rudiments of first aid and environmental concerns, proper disposal, and so on.
žHigh school. Teach concepts of toxicology (dose response, etc.) and environmental toxicology (bioaccumulation, etc.), as these concepts can be introduced into general science courses.
žUniversity. In addition to toxicology degrees, general courses for nontoxicology and/or nonscience majors should stress a balanced approach, with both responsible use and toxicity prevention as desirable end points. General Toxicology should be a required course in all chemically related academic programs such as chemistry and chemical engineering.
žMedia. Encourage a balanced approach to toxicity problems. Toxicologists should be available to media representatives and, where appropriate, should be involved directly.
SUGGESTED READING
American Conference of Governmental Industrial Hygienists. TLVs—Threshold Limit Values for Chemical Substances and Physical Agents in the Work Environment with Intended Changes. Cincinnati (published annually).
American Conference of Governmental Industrial Hygienists. Documentation of the Threshold Limit Values for Substances in Workroom Air. Cincinnati (published annually).
Doull, J. Recommended limits for exposure to chemicals. In Casarett and Doull’s Toxicology: The Basic Science of Poisons, 6th ed., C. D. Klaassen, ed. New York: McGraw-Hill, 2001, pp. 1115–1176.
Dreisbach, R. H. Handbook of Poisoning: Prevention, Diagnosis, and Treatment, 11th ed. Los Altos, CA: Lange Medical, 1983.
Ellenhorn, M. J., and D. G. Barceloux. Medical Toxicology: Diagnosis and Treatment of Human Poisoning. New York: Elsevier Science, 1998.
Environmental Regulation: An International View. A series of papers on: I. Britain, T. W. Hall; II. European Economic Community, S. P. Johnson; III. The United States, J. B. Ritch, Jr; IV. An Industry View, R. C. Tineknell. Chem. Soc. Rev. 5: 431–771, 1976.
Fan, A. M., and L. W. Chang, eds. Toxicology and Risk Assessment: Principles, Methods and Applications. New York: Dekker, 1996.
Merrill, R. A. Regulatory toxicology. In Casarett and Doull’s Toxicology: The Basic Science of Poisons, 6th ed., C. D. Klaassen, ed. New York: McGraw-Hill, 2001, pp. 1141–1153.
Sandmeyer, E. E. Regulatory toxicology. In A Guide to General Toxicology. F. Homberger, J. A. Hayes, E. W. Pelikan, eds. Basel: Karger, 1983, ch. 20.
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