Lysosomal and cellular zinc homeostasis

Lysosomal and cellular zinc homeostasis is a complex physiological process that maintains the concentration of zinc ions within optimal ranges across different cellular compartments (Kambe et al., 2015). This regulation is primarily achieved through the coordinated action of two solute carrier families: the SLC39A (ZIP) transporters, which import zinc into the cytosol, and the SLC30A (ZnT) transporters, which export zinc or sequester it into organelles (Colvin et al., 2010). The lysosome acts as a vital intracellular zinc store, with the Mucolipin-1 (TRPML1) channel serving as a key release mechanism into the cytoplasm, while transporters like ZnT2 facilitate zinc entry into the lysosomal lumen (Eichelsdoerfer et al., 2010). Dysregulation of these pathways is linked to various pathological states, most notably neurodegenerative diseases like Alzheimer's and Parkinson's, where zinc imbalance promotes protein aggregation and oxidative stress (Bush, 2003). Pharmacological strategies to address these imbalances include the use of zinc ionophores, such as PBT2, to redistribute ions, or small molecule agonists like ML-SA1 to restore lysosomal function by activating TRPML1 (Wang et al., 2015). Additionally, zinc chelators and supplements are used to manage systemic levels in conditions like Wilson's disease or chronic deficiency (Fischer et al., 1984). Understanding the interplay between these transporters is crucial for developing targeted therapies that can precisely modulate metal ion concentrations without causing systemic toxicity.

Other names

Zinc homeostasisLysosomal zinc regulationCellular zinc metabolismZinc transport system

Modulation of zinc transport across cellular and organellar membranes via ZIP and ZnT transporters or TRPML channels to restore physiological zinc levels and lysosomal function (Bush, 2003; Wang et al., 2015).