Ufelle & Barchowsky 2021 — Toxic Effects of Metals
Ingest Receipt
| Field | Value |
|---|---|
| Exact chapter | Chapter 23, Toxic Effects of Metals |
| Book | Casarett & Doull’s Essentials of Toxicology, Fourth Edition |
| Authors | Alexander C. Ufelle and Aaron Barchowsky |
| Publisher / year | McGraw Hill Education, 2021 |
| Raw file | raw/textbooks/Casarett & Doull's Essentials of Toxicology.pdf |
| Raw SHA-256 | 9bafeb78d24f52441e7611135abd5abc0a7fe310fe56fc3eade5ff560d02368b |
| License treatment | copyright-licensed-private; this page paraphrases facts and preserves short headings only. |
| Re-ingest reason | Earlier source page over-weighted cadmium. This re-ingest restores the chapter-level metal map, connects the source to existing metal/species nodes, and creates source-map stubs where the chapter names metals without existing pages. |
Chapter Structure Preserved
| Source section |
|---|
| Introduction |
| What Is a Metal? |
| Metals as Toxicants |
| Movement of Metals in the Environment |
| Routes of Exposure and Absorption of Metals |
| Distribution of Metals in the Body |
| Metal Transporters and Metal-Binding Proteins |
| Excretion of Metals |
| Biomarkers of Metal Exposure |
| Chemical Mechanisms of Metal Toxicology |
| Molecular Responses to Metal Exposure |
| Factors Impacting Metal Toxicity |
| Therapeutic Use and Toxicity of Metals |
| Major Toxic Metals |
| Arsenic |
| Cadmium |
| Chromium |
| Lead |
| Mercury |
| Nickel |
| Essential Metals With Potential for Toxicity |
| Cobalt |
| Copper |
| Iron |
| Magnesium |
| Molybdenum |
| Zinc |
| Metals Related to Medical Therapy |
| Aluminum |
| Lithium |
| Platinum |
| Minor Toxic Metals |
Figures And Tables Preserved
| Source figure/table | Wiki treatment |
|---|---|
| Figure 23-1 Overview of metal toxicology. | Preserved as chapter structure; figure image not reproduced because the source is copyrighted. |
| Table 23-1 Toxicity of several metals or metalloids. | Preserved as table title and chapter scope; table body not reproduced. |
| Figure 23-2 Cadmium transport, protein binding, and toxicity. | Preserved as cadmium subsection context; figure image not reproduced. |
| Figure 23-3 Lead interruption of heme biosynthesis. | Preserved as lead subsection context; figure image not reproduced. |
| Figure 23-4 The movement of mercury in the environment. | Preserved as mercury subsection context; figure image not reproduced. |
Metal Node Map
These are the metal and species nodes this chapter directly supports on the wiki.
| Chapter metal / species | Existing wiki node | Source role |
|---|---|---|
| Arsenic, including inorganic arsenic species and arsine | arsenic; see also arsenic-inorganic and arsenic-total | Toxicokinetics, acute/chronic toxicity, carcinogenicity, treatment, biomarkers, methylation/excretion context. |
| Cadmium | cadmium | Exposure, toxicokinetics, renal/pulmonary/skeletal/cardiovascular/reproductive toxicity, carcinogenicity, treatment limits. |
| Chromium | chromium (Cr-III and total); chromium-hexavalent (Cr-VI) | Hexavalent/trivalent distinction, absorption, corrosivity, allergic contact dermatitis, renal injury, lung cancer and genotoxicity mechanisms. |
| Lead | lead | Exposure, child/adult toxicokinetics, neurodevelopmental toxicity, heme synthesis interference, renal/cardiovascular/bone effects, carcinogenicity, treatment. |
| Mercury, methylmercury, inorganic mercury, elemental mercury vapor | mercury; see also mercury-methyl and mercury-total | Global cycling, fish exposure, vapor/inorganic/methylmercury toxicokinetics, neurotoxicity, renal toxicity, treatment. |
| Nickel | nickel | Occupational/dietary exposure, inhalation absorption, contact dermatitis, nickel carbonyl poisoning, lung/nasal cancer, epigenetic mechanisms, treatment. |
| Cobalt | cobalt | Essentiality as vitamin B12 metal, occupational inhalation toxicity, hard-metal lung disease, allergic dermatitis, cardiomyopathy, carcinogenicity context. |
| Copper | copper | Essentiality, copper transport, gastrointestinal/hepatic toxicity, Menkes disease, Wilson disease, treatment context. |
| Iron | iron | Essentiality, deficiency, acute poisoning, chronic overload, hemochromatosis, ROS-mediated tissue injury, treatment. |
| Magnesium | magnesium | Essentiality, deficiency, hypermagnesemia toxicity, magnesium oxide metal fume fever context. |
| Manganese | manganese | Mentioned in essential-metal framing, transport/excretion context, and neurodegeneration discussion; no dedicated subsection in this chapter excerpt. |
| Molybdenum | molybdenum | Essential enzyme cofactor context, molybdenum-cofactor deficiency, low toxicity, copper-deficiency-like excess toxicity. |
| Zinc | zinc | Essentiality, deficiency, dietary/occupational exposure, metal fume fever, neuronal and pancreatic toxicity at excess exposure. |
| Aluminum | aluminum | Food/drinking-water/occupational exposure, poor oral absorption, transferrin binding, renal excretion, dialysis dementia, bone and neurotoxicity, treatment. |
| Lithium | lithium | Medical-therapy context, narrow therapeutic index, neuromuscular/CNS/cardiovascular/gastrointestinal/renal/thyroid toxicity. |
| Platinum | platinum | Industrial and therapeutic context, antitumor platinum complexes, hypersensitivity, nephrotoxicity, neurotoxicity, ototoxicity, marrow suppression, carcinogenicity concerns. |
| Gold | gold | Named in immune-reaction and therapeutic-use context; source-map stub only until a dedicated gold ingest. |
| Beryllium | beryllium | Named in immune-reaction context; source-map stub only until a dedicated beryllium ingest. |
| Antimony | antimony | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Barium | barium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Cesium | cesium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Palladium | palladium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Silver | silver | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Tellurium | tellurium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Thallium | thallium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Tin | tin | Listed under minor toxic metals; no detailed subsection in the Essentials chapter. |
| Titanium | titanium | Listed as a minor toxic metal and named in implant-context discussion; source-map stub only until a dedicated ingest. |
| Uranium | uranium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
| Vanadium | vanadium | Listed as a minor toxic metal; source-map stub only until a dedicated ingest. |
Chapter-Level Toxicology Takeaways
This chapter is a teaching synthesis, not an occurrence dataset and not a regulatory risk assessment. Its strongest use in the Heavy Metal Index is to anchor cross-metal toxicology concepts: metals are persistent elements, speciation changes toxic potential, exposure route strongly changes target organ, and metal toxicity often works through transport mimicry, protein binding, oxidative stress, DNA repair interference, immune hypersensitivity, and epigenetic signaling.
The chapter emphasizes that children and elderly people may be more susceptible than most adults at a given exposure level. It also explicitly names mercury, gold, platinum, beryllium, chromium, and nickel as metals that can provoke immune reactions.
General Mechanisms
| Mechanism / concept | Chapter-level point |
|---|---|
| Environmental movement | Natural geological and biological cycling redistribute metals; human activities accelerate release from ore deposits into soil, water, air, and food webs. |
| Exposure routes | Oral ingestion, inhalation, and dermal contact are the main routes; implants and therapeutic administration are special routes. |
| Absorption controls | Solubility, pH, ligands, mucous-layer transport, and transport-protein density affect gastrointestinal uptake. |
| Transport mimicry | Toxic metals can enter cells by mimicking essential ions or by using relatively promiscuous metal transport systems. |
| Binding proteins | Transferrin, ceruloplasmin, albumin, ferritin, metallothioneins, metal transporters, and chaperone proteins shape distribution, storage, toxicity, and excretion. |
| Excretion | Metals may leave via fecal, biliary, urinary, sweat, hair, and nail routes; blood and urine usually capture recent exposure while hair/nails can reflect longer windows. |
| Biomarkers | Blood, urine, hair, nails, DNA-protein complexes, metallothionein expression, and hemeoxygenase expression can function as exposure or effect markers depending on metal and timing. |
| Toxicity mechanisms | Adventitious binding to enzymes/proteins, displacement of essential metals, ROS generation, DNA/protein adducts, altered gene expression, impaired DNA repair, and mitochondrial injury recur across metals. |
Major Toxic Metals
| Metal | Key chapter characterization | Existing wiki node |
|---|---|---|
| Arsenic | Toxic and carcinogenic metalloid; major environmental exposure from contaminated drinking water, rice, seafood, and occupational settings; inorganic arsenic is well absorbed and excreted largely in urine after methylation; chronic exposure targets skin, cardiovascular system, respiratory tract, liver, peripheral nerves, immune function, and cancer risk. | arsenic |
| Cadmium | Food, tobacco smoke, and occupational inhalation are major exposure routes; gastrointestinal absorption is limited but increased by iron/calcium deficiency and low-protein diet; half-life is measured in decades; primary chronic targets include kidney, lung, bone, cardiovascular system, reproductive/developmental endpoints, and cancer. | cadmium |
| Chromium | Hexavalent chromium is the high-concern carcinogenic form; trivalent chromium is less absorbed; Cr(VI) crosses membranes via sulfate/phosphate transporters and is associated with corrosive injury, allergic contact dermatitis, renal injury, and lung cancer. | chromium-hexavalent (Cr-VI); chromium (Cr-III and total) |
| Lead | Major exposure routes include occupational dust/fume, lead paint, old housing dust, water infrastructure, food, and soil; children absorb and retain much more ingested lead than adults; targets include developing brain, heme synthesis, kidney, cardiovascular system, immune system, bone, teeth, and cancer-relevant pathways. | lead |
| Mercury | Elemental vapor, inorganic salts, and methylmercury have distinct kinetics and targets; methylmercury from fish is the major dietary human concern and crosses the blood-brain barrier and placenta; vapor exposure targets the CNS; inorganic mercury targets kidney. | mercury |
| Nickel | Exposure occurs occupationally by inhalation/dermal contact and generally through air, smoke, water, and food; key toxic outcomes include allergic contact dermatitis, nickel carbonyl poisoning, lung/nasal cancer, DNA repair disruption, ROS, glutathione depletion, and epigenetic effects. | nickel |
Essential Metals With Potential For Toxicity
| Metal | Key chapter characterization | Existing wiki node |
|---|---|---|
| Cobalt | Essential as vitamin B12 cofactor but toxic through hard-metal lung disease, allergic dermatitis, cardiomyopathy, HIF signaling, and carcinogenicity evidence for some compounds/materials. | cobalt |
| Copper | Essential for enzymes including cytochrome c oxidase, lysyl oxidase, and Cu/Zn superoxide dismutase; excess causes gastrointestinal and hepatic toxicity; inherited disorders include Menkes disease and Wilson disease. | copper |
| Iron | Essential for erythropoiesis and heme proteins; acute poisoning and chronic iron overload cause gastrointestinal, metabolic, hepatic, cardiac, endocrine, and ROS-mediated tissue injury. | iron |
| Magnesium | Essential cofactor in energy metabolism; deficiency is usually more clinically important than excess, but excess can cause neuromuscular, cardiovascular, and CNS toxicity. | magnesium |
| Molybdenum | Essential cofactor for sulfite oxidase, xanthine oxidase, aldehyde oxidase, and mitochondrial amidoxime reductase; excess resembles copper deficiency. | molybdenum |
| Zinc | Essential trace element involved in hundreds of enzymes and transcription factors; excess causes gastrointestinal distress, metal fume fever, possible neuronal effects, and pancreatic toxicity. | zinc |
Metals Related To Medical Therapy
| Metal | Key chapter characterization | Existing wiki node |
|---|---|---|
| Aluminum | Food is the primary exposure source and drinking water secondary; oral absorption is poor; key concerns include workplace lung effects, bone toxicity, neurotoxicity, dialysis dementia, and chelation in high-burden clinical settings. | aluminum |
| Lithium | Medicinal use in mania and bipolar disorder is the major toxicity context; narrow therapeutic index with neuromuscular, CNS, cardiovascular, gastrointestinal, renal, and thyroid effects. | lithium |
| Platinum | Platinum coordination complexes are major antitumor agents; toxicity includes hypersensitivity/platinosis, nephrotoxicity, neuropathy, ototoxicity, marrow suppression, and carcinogenicity concerns for cisplatin. | platinum |
Minor Toxic Metals
The chapter lists antimony, barium, cesium, palladium, silver, tellurium, thallium, tin, titanium, uranium, and vanadium as additional metals for which toxicity has been described. These are represented as source-map stubs until dedicated metal ingests expand them.
Evidence Fitness
| Use case | Verdict | Reason |
|---|---|---|
| Cross-metal toxicology education | Strong source | This is a textbook chapter in a canonical toxicology text and is appropriate for teaching-level synthesis. |
| Metal-page mechanism cross-links | Appropriate | The chapter provides concise, route-specific and mechanism-specific summaries for multiple metal and species nodes on the wiki. |
| Category 1 food occurrence values | Not applicable | The chapter does not provide food occurrence datasets, p-values, market distributions, or product concentration measurements. |
| Regulatory limits | Context only | The chapter is not a regulatory source and does not establish enforceable values. |
Provenance Notes
License class copyright-licensed-private. Casarett & Doull’s Essentials of Toxicology is a copyrighted McGraw Hill publication; the raw PDF is held privately under raw/textbooks/ and is not redistributed. This source page uses paraphrase, short headings, and citation-level facts only.
Wiki Pages Updated On Re-Ingest
- arsenic
- arsenic-inorganic
- arsenic-total
- cadmium
- chromium
- chromium-hexavalent
- cobalt
- copper
- iron
- magnesium
- molybdenum
- lead
- lithium
- mercury
- mercury-methyl
- mercury-total
- nickel
- platinum
- zinc
- aluminum
- antimony
- barium
- beryllium
- cesium
- gold
- manganese
- palladium
- silver
- tellurium
- thallium
- tin
- titanium
- uranium
- vanadium