[Cadmium--element completely unnecessary for the organism]

Area of Science:

• Environmental toxicology
• Cellular biology
• Molecular mechanisms

Context:

• Cadmium (Cd) is a significant environmental pollutant with widespread toxic effects on human and animal health.
• Exposure to cadmium can lead to its accumulation in the body, primarily impacting organs like the kidneys and liver, which are crucial for its elimination.
• Understanding cadmium's toxicity is vital due to its prevalence and adverse health implications.

Purpose:

• To provide a comprehensive overview of the current knowledge on the molecular mechanisms underlying cadmium's toxic action in cells.
• To discuss various pathways through which cadmium exerts its detrimental effects at the cellular level.
• To consolidate information on cadmium-induced cellular damage, signaling pathway alterations, and genotoxicity.

Summary:

• Cadmium disrupts the cellular antioxidant system and thiol status, leading to oxidative stress.
• It generates reactive oxygen species (ROS), inhibits DNA repair and methylation, and alters cellular signaling pathways, including protooncogene activation.
• Cadmium also affects cell adhesion, induces apoptosis, promotes cell proliferation, and initiates mutagenesis and carcinogenesis.

Impact:

• Elucidates the complex molecular interactions of cadmium toxicity, aiding in risk assessment and mitigation strategies.
• Provides a foundation for developing targeted interventions to counteract cadmium's adverse health effects.
• Highlights the potential for cadmium exposure to contribute to chronic diseases and cancer development.