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General aspects of metal toxicity
H Kozlowski, P Kolkowska, J Watly
1University of Wroclaw, Faculty of Chemistry, Joliot-Curie 14 St. 50-383 Wroclaw, Poland. henryk.kozlowski@chem.uni.wroc.pl.
Current Medicinal Chemistry
|July 22, 2014
Summary
This review details how metals like iron, copper, nickel, cadmium, chromium, aluminum, lead, tin, and mercury cause toxicity in humans. It categorizes metals by their toxic mechanisms, including reactive oxygen species generation and interference with essential metal ions.
Area of Science:
- Environmental toxicology
- Human health impacts of metals
Background:
- Metal toxicity is a significant concern in human health.
- Understanding the mechanisms of metal toxicity is crucial for developing effective interventions.
Purpose of the Study:
- To review the general mechanisms of metal toxicity in humans.
- To categorize metals based on their toxic effects and modes of action.
Main Methods:
- Literature review of scientific studies on metal toxicity.
- Classification of metals into four groups based on toxicological mechanisms.
- Discussion of specific examples of metal toxicity, including Fenton reaction, carcinogenicity, and neurotoxicity.
Main Results:
- Metals are grouped by their primary toxic mechanisms: Fenton reaction catalysts (iron, copper), carcinogenic agents (nickel, cadmium, chromium), neurotoxic agents (aluminum, lead, tin), and general toxicants (mercury).
- Reactive oxygen species generation via Fenton reaction by iron and copper can damage biomolecules.
- Chromium(VI) is a potent carcinogen and oxidative agent, while other metals like aluminum, cadmium, and mercury can interfere with essential metal ions.
Conclusions:
- Metal toxicity arises from diverse mechanisms including oxidative stress, carcinogenicity, neurotoxicity, and disruption of metal homeostasis.
- The specific oxidation state and chemical properties of metals significantly influence their toxic potential.
- Further research into these mechanisms can inform risk assessment and therapeutic strategies for metal poisoning.
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