Chromium toxicity in humans
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Chromium Toxicity in Humans: Forms, Exposure Routes, and Health Effects
Chromium Forms and Human Exposure Pathways
Chromium exists mainly in two forms relevant to human health: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). Cr(III) is an essential micronutrient involved in metabolism, while Cr(VI) is highly toxic and has no known biological function in humans 1458. Human exposure to chromium can occur through inhalation, ingestion, or dermal contact, with occupational settings and environmental pollution being the primary sources 2467+1 MORE.
Mechanisms of Chromium Toxicity and Carcinogenicity
Cr(VI) is much more toxic than Cr(III) due to its high solubility and mobility, allowing it to enter cells easily and cause damage 2458. Once inside the body, Cr(VI) induces toxicity through several mechanisms:
- Oxidative Stress: Cr(VI) increases the production of reactive oxygen species (ROS), leading to oxidative damage and redox imbalance 2489.
- DNA and Chromosomal Damage: Cr(VI) can cause DNA damage, genomic instability, and mutagenesis, contributing to carcinogenesis 1348+2 MORE.
- Epigenetic Modifications: Changes in gene expression, such as histone acetylation/methylation and gene methylation, are linked to Cr(VI) exposure 128.
- Cellular and Tissue Damage: Cr(VI) exposure leads to structural changes in cells, including mitochondrial and nuclear membrane alterations, and can trigger apoptosis (cell death) 29.
Health Effects of Chromium Exposure
Carcinogenic Effects
Cr(VI) is a well-established human carcinogen, especially through inhalation, leading to an increased risk of lung cancer in both smokers and non-smokers 35710. There is also evidence suggesting possible links to cancers in the gastrointestinal and central nervous systems, particularly with chronic exposure 310.
Non-Carcinogenic Effects
Chronic and acute exposure to Cr(VI) can cause a range of non-cancer health issues:
- Respiratory System: Inhalation can result in bronchial irritation, asthma, and even perforation of the nasal septum 25710.
- Skin and Mucous Membranes: Dermatitis, allergic reactions, ulcers, and eczematous skin conditions are common after contact with Cr(VI) 457.
- Gastrointestinal and Renal Systems: Ingestion can cause gastroenteritis, liver and kidney damage, and metabolic disturbances 245.
- Immune and Reproductive Systems: Chromium exposure can disrupt immune function and damage the male reproductive system 24.
Individual Susceptibility and Risk Factors
The severity of chromium toxicity varies among individuals due to genetic differences, such as enzymatic polymorphisms, DNA repair efficiency, and the body's ability to detoxify chromium . External factors, including the level and duration of exposure, also play a significant role in determining health outcomes 146.
Prevention, Monitoring, and Remediation
Preventing chromium toxicity involves reducing occupational and environmental exposure, regular biomonitoring of at-risk populations, and implementing remediation strategies. Promising approaches include restoring antioxidant balance, regulating cellular defense pathways, and exploring sustainable methods like gut remediation using probiotics 2789.
Conclusion
Chromium toxicity in humans is primarily associated with exposure to hexavalent chromium (Cr(VI)), which can cause both carcinogenic and non-carcinogenic health effects through multiple mechanisms, including oxidative stress and DNA damage. Individual susceptibility and exposure routes influence the severity of health outcomes. Effective prevention and remediation strategies are essential to minimize the risks associated with chromium exposure.
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Most relevant research papers on this topic
Mechanism of chromium-induced toxicity in lungs, liver, and kidney and their ameliorative agents.
Chromium toxicity in lungs, liver, and kidneys can be alleviated by agents that restore antioxidant balance, regulate Nrf-2 levels, or increase anti-apoptotic proteins while decreasing pro-apoptotic proteins.
Toxicity and Carcinogenicity of Chromium Compounds in Humans
Chronic drinking-water exposure to hexavalent chromium combined with solar ultraviolet light can induce skin tumors in mice, suggesting it may be a human carcinogen by ingestion as well.
Adverse Human Health Effects of Chromium by Exposure Route: A Comprehensive Review Based on Toxicogenomic Approach
Chromium exposure can cause severe health effects through dermal contact, inhalation, and ingestion, with underlying mechanisms based on transcriptomic data and bioinformatics tools.
Hexavalent chromium: Regulation and health effects.
Chromium, found in our daily diet, can cause skin allergies and increase lung cancer risk, but its regulation in industry and biomonitoring in blood and urine samples can help control exposure levels.
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