Copper toxicity
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Copper Toxicity: Essentiality and Risks
Copper is an essential trace element required for many biological processes, including enzyme function and cellular respiration. However, when copper accumulates in excess, it becomes toxic and can cause significant harm to cells, tissues, and organs in both humans and animals 145.
Mechanisms of Copper Toxicity
Oxidative Stress and Cellular Damage
A primary mechanism of copper toxicity is its ability to generate oxidative stress. Excess copper can catalyze the production of reactive oxygen species (ROS), leading to oxidative damage of proteins, lipids, and DNA. This oxidative stress disrupts normal cellular functions and can trigger cell death 457.
Mitochondrial Dysfunction and Cuproptosis
Recent research has shown that copper toxicity can cause mitochondrial protein aggregation and disrupt specific metabolic enzymes, leading to a unique form of cell death called cuproptosis. This process involves copper binding to lipoylated proteins in the tricarboxylic acid (TCA) cycle, resulting in mitochondrial dysfunction and cell death 56.
Disruption of Metal Homeostasis
Copper toxicity is not limited to oxidative damage. It can also interfere with the function of other essential metals, such as zinc, by disrupting zinc-dependent processes. This is particularly evident in liver diseases like Wilson disease, where copper accumulation specifically impacts zinc systems and other biochemical pathways beyond redox activity 110.
Effects on Erythrocytes and Metabolism
In animal studies, toxic copper levels have been shown to increase the glycolytic rate and glutathione production in red blood cells, likely as a compensatory response to increased oxidative stress and cellular hypoxia. These changes can alter energy metabolism and electrolyte balance .
Organ and Systemic Effects
Liver and Brain
The liver is the central organ for copper homeostasis. Disorders such as Wilson disease, which involve defective copper transport, lead to copper accumulation primarily in the liver and brain. This accumulation causes progressive cellular damage and can be fatal if untreated 1410.
Respiratory System
Inhalation of copper compounds can cause acute cellular responses in the lungs, such as inflammation and increased cellularity. However, these effects are generally reversible after exposure stops, and there is no evidence of long-term pathology in animal studies .
Gastrointestinal and Systemic Toxicity
Ingesting high levels of soluble copper salts can cause acute gastrointestinal symptoms and, in rare cases, liver toxicity, especially in individuals with genetic susceptibility to copper dysregulation. Chronic exposure can lead to organ toxicity, but most people are protected by regulatory limits on copper intake .
Antimicrobial and Therapeutic Aspects
Copper’s toxicity to microbes is harnessed in antimicrobial technologies, such as copper nanoparticles and surfaces. The mechanisms involve membrane rupture, protein inactivation, and DNA damage in bacteria and viruses. Understanding these mechanisms helps in developing effective antimicrobial strategies 73.
Conclusion
Copper is vital for life, but its excess poses significant health risks through oxidative stress, mitochondrial dysfunction, and disruption of metal homeostasis. The liver and brain are particularly vulnerable to copper overload, as seen in genetic disorders like Wilson disease. While the body has adaptive mechanisms to manage short-term copper exposure, chronic or excessive intake can lead to serious toxicity. Ongoing research continues to uncover the complex pathways of copper toxicity and explores ways to exploit its toxic effects for therapeutic benefit, such as in cancer treatment and antimicrobial applications 1356.
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Most relevant research papers on this topic
Deadly excess copper
Excess copper accumulation in the liver and brain can be fatal, and new therapies are being developed to combat this issue.
Toxicity Mechanisms of Copper Nanoparticles and Copper Surfaces on Bacterial Cells and Viruses
Copper nanoparticles and surfaces exhibit antimicrobial properties by disrupting bacteria and fungi's membranes, causing DNA damage, and potentially causing ROS production and genetic material degradation in viruses.
Critical Review of Exposure and Effects: Implications for Setting Regulatory Health Criteria for Ingested Copper
An oral reference dose of 0.04 mg Cu/kg/day is protective against acute or chronic toxicity in adults and children, considering deficiency, toxicity, and genetic susceptibility.
Toxic copper level increases erythrocyte glycolytic rate, glutathione production and alters electrolyte balance in male Wistar rats.
Copper toxicity increases erythrocyte glycolytic rate and glutathione production, potentially as a compensatory mechanism for cellular hypoxia and increased free radical generation in male Wistar rats.
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