Lead Toxicology

Lead toxicology is a cornerstone topic in environmental and occupational health, with significant implications for public health in Zambia and globally. This topic delves into the ubiquitous nature of lead exposure through air, water, food, and soil contamination, highlighting its historical use in paints, batteries, and fuel. Zambian university students in biomedical sciences, public health, and environmental studies will explore lead's toxicokinetics: its efficient absorption in children, distribution to blood, liver, kidney, and ultimate sequestration in bone. The core mechanisms of toxicity, including inhibition of heme synthesis enzymes (ALAD, heme synthetase) leading to anemia, and its potent neurotoxic effects—especially critical in the developing nervous systems of infants and children—are examined in detail. Additionally, the topic covers lead's reproductive toxicity, renal effects, and the principles of chelation therapy using agents like EDTA and DMSA. Understanding lead toxicology is essential for exam success and for contributing to national efforts in lead poisoning prevention, screening, and management within Zambia's tertiary healthcare and regulatory frameworks.