PRINCIPLES OF TOXICOLOGY

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Figure 13.1 Schematic diagram of the development of a malignant tumor from a normal cell. 271
272 CHEMICAL CARCINOGENESIS Figure 13.2 Generalized scheme of initiation-promotion experiments. Initiation is caused by a single dose of an initiating agent such as a carcinogenic polycyclic aromatic hydrocarbon; promotion is carried out by repeated application or chronic dosing with a tumor promotor such as TPA. (I, initiator; P, promoter; solid line indicates continual application of agent; dotted lines indicate the duration of time without exposure to an agent.) • Initiation must occur prior to promotion. • Repeated exposure to a promoter alone will result in few, if any tumors. Experiments with initiation–promotion models have demonstrated that there are chemicals that possess both initiator and promoter activity. These chemicals are known as complete carcinogens. By the same token, chemicals that cannot by themselves induce cancer in experimental animal models are called incomplete carcinogens. In reality, dosage is a critical factor in determining whether a chemical is a complete carcinogen. At sufficiently low doses, most initiators require subsequent promotion for the development of a tumor, while at very high doses, most carcinogens possess initiating and promoting ability. As you will learn later, this has important implications for the identification and the assessment of risk associated with potential carcinogens. Electrophilic Theory The nature of the initiation step in chemical carcinogenesis was the subject of much scientific inquiry and debate for decades. Until 1940, the only known chemical carcinogens were aromatic hydrocarbons and amines. Soon afterward, other aliphatic chemicals were also shown to be carcinogenic and by the 1960s the various chemical carcinogens belonged to over a dozen chemical classes (Figure 13.3). Attempting to explain this structural diversity, in 1969 James and Elizabeth Miller hypothesized that “most, if not all, chemical carcinogens either are, or are converted to, reactive electrophilic derivatives which combine with nucleophilic growth crucial tissue components, such as nucleic acids or proteins.” In what became known as the electrophilic theory of chemical carcinogenesis, the Millers described the metabolic activation of inactive procarcinogens to intermediates they called proximate carcinogens and on to ultimate carcinogens that covalently bind DNA and cause mutations. Examples of chemical carcinogens that require metabolic activation include benzo[a]pyrene and other polycyclic aromatic hydrocarbons, 1,3-butadiene, and 2-acetylaminofluorene. The bioactivation of several chemical carcinogens is illustrated in Figure 13.4.
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PRINCIPLES OF TOXICOLOGY
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This book is printed on acid-free p
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vi CONTRI BUTORS PAUL J. MIDDENDORF
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viii CONTENTS 4 Hematotoxicity: Che
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x CONTENTS 12 Mutagenesis and Genet
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xii CONTENTS III APPLICATIONS 435 1
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PREFACE Purpose of This Book Princi
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ACKNOWLEDGMENTS A text of this unde
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PART I Conceptual Aspects Principle
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4 GENERAL PRINCIPLES OF TOXICOLOGY
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36 ABSORPTION, DISTRIBUTION, AND EL
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3 Biotransformation: A Balance betw
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BIOTRANSFORMATION: A BALANCE BETWEE
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BIOTRANSFORMATION: A BALANCE BETWEE
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Figure 3.5 Diagrammatic rendition o
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3.2 BIOTRANSFORMATION REACTIONS The
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TABLE 3.4 Important Cytochrome P450
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Figure 3.8 Cytochrome P450-catalyze
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oth of which are suitable for conju
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TABLE 3.6 Changes in Rat Hepatic Dr
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3.2 BIOTRANSFORMATION REACTIONS 75
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TABLE 3.7 Induction of Xenobiotic-M
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3.2 BIOTRANSFORMATION REACTIONS 79
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pyridoxal phosphate depletion by th
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Biotransformation: A Balance betwee
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een shown to be responsible for the
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4 Hematotoxicity: Chemically Induce
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Figure 4.1 Formation of blood. Matu
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TABLE 4.2 Leukemias and Lymphomas 4
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4.3 THE MYELOID SERIES 93 to contra
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function and response to stimuli, (
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Hypoxia can result from a variety o
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4.7 INORGANIC NITRATES/NITRITES AND
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Exposure to aromatic amines can be
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4.10 BONE MARROW SUPPRESSION AND LE
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4.12 TOXICITIES THAT INDIRECTLY INV
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4.15 ANTIDOTES FOR HYDROGEN SULFIDE
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REFERENCES AND SUGGESTED READING 10
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112 HEPATOTOXICITY: TOXIC EFFECTS O
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130 NEPHROTOXICITY: TOXIC RESPONSES
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7 Neurotoxicity: Toxic Responses of
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ions moving out of the cell brings
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an effect seen with some neurotoxic
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7.4 INTERACTIONS OF INDUSTRIAL CHEM
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• A study of the patient’s hist
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• Although much of the damage whi
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158 DERMAL AND OCULAR TOXICOLOGY Fi
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160 DERMAL AND OCULAR TOXICOLOGY P4
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162 DERMAL AND OCULAR TOXICOLOGY ca
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164 DERMAL AND OCULAR TOXICOLOGY ke
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166 DERMAL AND OCULAR TOXICOLOGY Fi
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168 DERMAL AND OCULAR TOXICOLOGY
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170 PULMONOTOXICITY: TOXIC EFFECTS
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10 Immunotoxicity: Toxic Effects on
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10.2 BIOLOGY OF THE IMMUNE RESPONSE
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10.2 BIOLOGY OF THE IMMUNE RESPONSE
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certain situations immunosuppressio
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10.5 TESTS FOR DETECTING IMMUNOTOXI
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10.6 SPECIFIC CHEMICALS THAT ADVERS
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10.6 SPECIFIC CHEMICALS THAT ADVERS
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animal origin have also been shown
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The mainstay of treatment of multip
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PART II Specific Areas of Concern P
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210 REPRODUCTIVE TOXICOLOGY continu
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212 REPRODUCTIVE TOXICOLOGY Underst
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214 REPRODUCTIVE TOXICOLOGY spermat
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216 REPRODUCTIVE TOXICOLOGY gonadot
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218 REPRODUCTIVE TOXICOLOGY TABLE 1
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Page 235 and 236: 226 Figure 11.5 Developmental tree
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Page 257 and 258: 248 Figure 12.5 Example of DNA addu
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322 CHEMICAL CARCINOGENESIS Figure
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324 CHEMICAL CARCINOGENESIS Knudson
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326 PROPERTIES AND EFFECTS OF METAL
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332 TABLE 14.2 Target Organ Toxicit
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346 PROPERTIES AND EFFECTS OF PESTI
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368 PROPERTIES AND EFFECTS OF ORGAN
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370 TABLE 16.1 (Continued) Water So
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410 PROPERTIES AND EFFECTS OF NATUR
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PART III Applications Principles of
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438 RISK ASSESSMENT 18.1 RISK ASSES
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440 RISK ASSESSMENT control populat
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442 RISK ASSESSMENT there are some
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444 RISK ASSESSMENT • It identifi
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446 RISK ASSESSMENT chemical poses
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448 RISK ASSESSMENT • Estimating
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450 RISK ASSESSMENT Figure 18.3 Est
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452 RISK ASSESSMENT • As discusse
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454 RISK ASSESSMENT divided by a de
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456 RISK ASSESSMENT Because low-dos
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458 RISK ASSESSMENT TABLE 18.1 Expe
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460 RISK ASSESSMENT leading to impo
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462 RISK ASSESSMENT characterizatio
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464 RISK ASSESSMENT Figure 18.7 Sim
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466 RISK ASSESSMENT The RPF values
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468 RISK ASSESSMENT producing the e
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470 RISK ASSESSMENT TABLE 18.4b Can
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472 RISK ASSESSMENT TABLE 18.7 Acti
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474 RISK ASSESSMENT A second reason
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476 RISK ASSESSMENT Barnard, R. C.,
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19 Example of Risk Assessment Appli
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19.3 LEAD EXPOSURE AND WOMEN OF CHI
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19.4 PETROLEUM HYDROCARBONS: ASSESS
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19.4 PETROLEUM HYDROCARBONS: ASSESS
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19.5 RISK ASSESSMENT FOR ARSENIC 48
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19.5 RISK ASSESSMENT FOR ARSENIC 48
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19.6 REEVALUATION OF THE CARCINOGEN
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REFERENCES AND SUGGESTED READING RE
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20 Occupational and Environmental H
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20.1 DEFINITION AND SCOPE OF THE PR
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20.4 HUMAN RESOURCES IMPORTANT TO O
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treatment, or medical removal from
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Academic practices welcome complica
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Occupational and environmental medi
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512 EPIDEMIOLOGIC ISSUES IN OCCUPAT
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22 Controlling Occupational and Env
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22.2 EXPOSURE LIMITS 525 The TLVs
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modified “reference doses” to r
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observation process, followed by re
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• Hazard-specific training to ens
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22.3 PROGRAM MANAGEMENT 533 Conside
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Figure 22.1 22.3 PROGRAM MANAGEMENT
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fundamental viability of the work p
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Figure 22.2. 22.3 PROGRAM MANAGEMEN
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• Physical assessment and fit tes
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The study was designed to minimize
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TABLE 22.3 Margins of Safety at For
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top, and numerous slots with smalle
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TABLE 22.5 Comparison of Time-Weigh
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• Housing or building code violat
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• Environmental exposure limits,
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GLOSSARY Glossary absorption The mo
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GLOSSARY 557 antipyretic An agent t
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GLOSSARY 559 chloracne An acne-like
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GLOSSARY 561 eczema A superficial i
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GLOSSARY 563 hemolytic anemia Anemi
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GLOSSARY 565 lipoprotein Any of a g
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GLOSSARY 567 necrosis Death of one
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pernicious anemia The progressive,
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GLOSSARY 571 cells have both endoth
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GLOSSARY 573 tolerance The ability
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576 INDEX Allergic reaction (contin
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578 INDEX Biotransformation (contin
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580 INDEX Children’s health statu
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582 INDEX Diet and nutrition (conti
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584 INDEX Estrogens: endocrine disr
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586 INDEX Hair, toxic agent excreti
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588 INDEX hnmunoglobulins: autoimmu
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590 INDEX Loop of Henle, structure
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592 INDEX Mixed exposure patterns,
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594 INDEX Nutritional deficiencies,
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596 INDEX Pesticides (continued) Pe
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598 INDEX Relative potency factor (
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600 INDEX Solvents (continued) phys
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602 INDEX Tumorigenesis (continued)
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PRINCIPLES OF TOXICOLOGY

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