Copper ion (extracellular and mitochondrial pool) (Cu)

Copper ions in the extracellular and mitochondrial pools are essential trace elements that function as critical cofactors for a variety of enzymes, including cytochrome c oxidase and superoxide dismutase (Ruiz et al., 2021, Nature Reviews Molecular Cell Biology). These ions play a fundamental role in mitochondrial respiration, antioxidant defense, and the regulation of cell signaling pathways. Dysregulation of copper homeostasis, characterized by either deficiency or toxic accumulation, is central to the pathogenesis of Wilson's disease, Menkes disease, and various cancers (National Institutes of Health, 2021). In oncology, targeting the mitochondrial copper pool has emerged as a novel strategy to induce cuproptosis, a copper-dependent form of regulated cell death (Tsvetkov et al., 2022, Science). Therapeutic interventions typically utilize chelating agents to reduce systemic copper levels or ionophores to selectively increase copper concentrations within specific cellular compartments to achieve a therapeutic effect.

Other names

CopperCupric ionCuprous ionLabile copper poolMitochondrial copperExtracellular copper

Drugs targeting copper ions primarily act through chelation, where they bind to extracellular or intracellular copper to facilitate its excretion, thereby reducing systemic toxicity (Roberts & Schilsky, 2008, Hepatology). Alternatively, copper ionophores like elesclomol transport copper into the mitochondria, where an accumulation of copper leads to the aggregation of lipoylated proteins in the TCA cycle, triggering a unique form of cell death known as cuproptosis (Tsvetkov et al., 2022, Science). Zinc-based therapies work indirectly by inducing intestinal metallothionein, which traps dietary copper and prevents its absorption into the systemic pool.