Lead(II) ion (Pb2+) (Pb2+)

Lead(II) ion (Pb2+) is a potent environmental toxin that enters the human body primarily through ingestion or inhalation. In the gastrointestinal tract, Pb2+ competes with essential divalent cations for absorption, primarily via the Divalent Metal Transporter 1 (DMT1) (PMID: 12514114). Once systemic, lead exerts its toxicity by mimicking calcium and zinc, thereby disrupting various enzymatic activities and cellular signaling pathways, most notably inhibiting ferrochelatase and delta-aminolevulinic acid dehydratase in the heme synthesis pathway (StatPearls: Lead Toxicity). This interference results in multi-organ dysfunction, including neurodevelopmental delays in children, nephropathy, and microcytic anemia. Therapeutic intervention focuses on chelation therapy, where drugs like succimer or edetate calcium disodium act as ligands to sequester Pb2+ into stable, water-soluble complexes for renal excretion. While effective at reducing blood lead levels, these treatments must be carefully managed to avoid the redistribution of lead to the brain or the depletion of essential minerals (CDC: Lead).

Other names

Lead ionPlumbous ionPb(II)Divalent lead

Chelation therapy involves the administration of ligands that bind to the lead ion to form a stable, non-toxic, water-soluble complex that can be excreted renally or hepatically.