Cadmium Toxicology

Cadmium toxicology focuses on a metal with exceptional environmental persistence and a long biological half-life, leading to cumulative toxicity. This topic is essential for Zambian college and university students in biomedical and environmental sciences due to cadmium's association with mining, smelting, sewage sludge, and contaminated food crops like rice and leafy vegetables. Students will study cadmium's toxicokinetics, including its binding to metallothionein (MT), accumulation in the kidney and liver, and extremely slow excretion. The topic details the acute effects of inhalation (pulmonary edema) and ingestion (GI irritation), but emphasizes the chronic nephrotoxicity characterized by proximal tubular damage, which can progress to renal failure. The classic 'Itai-Itai' disease from Japan serves as a profound case study of chronic cadmium poisoning. Understanding cadmium's mechanisms, including oxidative stress and disruption of calcium metabolism leading to osteomalacia, is vital for examination success and for developing strategies to mitigate exposure and manage poisoning in occupational and community settings within Zambia.