Actinide metal ions (An)

Actinide metal ions are a series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103), characterized by their radioactivity and high chemical toxicity (National Research Council, 1988). These ions have no known natural biological role in humans and are primarily encountered through industrial accidents, nuclear medicine, or environmental contamination. Once internalized, actinides like Plutonium and Americium exhibit complex pharmacokinetics, often mimicking essential ions such as Fe3+ and Ca2+ to bind with transport proteins like transferrin or deposit in the hydroxyapatite of bone (Ansoborlo et al., 2007). This deposition leads to prolonged internal radiation exposure, significantly increasing the risk of osteosarcoma, liver cancer, and nephrotoxicity (PubMed). Therapeutic management relies on decorporation therapy using chelating agents, such as Calcium-DTPA and Zinc-DTPA, which are FDA-approved to enhance the excretion of these metals by forming stable, water-soluble complexes (FDA, 2004). Modern drug development focuses on novel ligands like hydroxypyridinones (HOPO) to improve oral bioavailability and binding affinity for a wider range of actinide oxidation states (Gorden et al., 2003).

Other names

ActinidesActinoidsTransuranic elementsf-block elementsRadioactive heavy metals

Chelation therapy involving the formation of stable, water-soluble complexes with actinide ions to facilitate renal or biliary excretion and prevent tissue deposition (FDA, 2004; PubMed).