Free intracellular metal ions

Free intracellular metal ions, collectively known as the labile metal pool (LMP), represent the fraction of intracellular metals such as iron, copper, and zinc that are not tightly bound to proteins or sequestered in organelles (Kakalij et al., 2023, PubMed). These ions are essential for cellular life, acting as catalytic cofactors for numerous enzymes and serving as signaling molecules in pathways like calcium-mediated transduction (Nature Reviews Molecular Cell Biology). However, the LMP is chemically reactive; for instance, labile iron and copper can participate in Fenton chemistry to generate hydroxyl radicals, leading to oxidative stress and cellular damage (Free Radical Biology and Medicine). In pathological states like Wilson's disease or hereditary hemochromatosis, the expansion of this pool leads to organ toxicity, particularly in the liver and brain (NIH/NIDDK). Therapeutic strategies target these ions using chelating agents, which possess high affinity for specific metal ions, forming stable complexes that are subsequently excreted from the body (StatPearls). Managing the labile metal pool is also a focus in neurodegenerative research, where metal dyshomeostasis is linked to protein aggregation and neuronal death (Frontiers in Aging Neuroscience).

Other names

Labile metal poolIntracellular metal poolNon-protein-bound metal ionsChelatable metal pool

Chelation of free or loosely bound metal ions to form stable, water-soluble complexes for renal or biliary excretion.