Glutathione transport and uptake machinery

The glutathione transport and uptake machinery is a coordinated system of membrane transporters and enzymes that maintain cellular and systemic glutathione (GSH) homeostasis. This machinery primarily includes the cystine/glutamate antiporter (SLC7A11/xCT), which imports the rate-limiting precursor cystine for intracellular GSH synthesis, and multidrug resistance-associated proteins (such as ABCC1/MRP1), which facilitate the efflux of GSH, its oxidized form (GSSG), and GSH-xenobiotic conjugates. Additionally, the cell-surface enzyme gamma-glutamyltransferase (GGT1) initiates the breakdown of extracellular GSH, allowing for the salvage of its constituent amino acids. This system is vital for protecting cells against oxidative stress, regulating ferroptosis, and detoxifying xenobiotics. In cancer, the upregulation of these components often leads to chemoresistance and evasion of cell death, making them significant therapeutic targets. Conversely, dysfunction in this machinery is associated with neurodegenerative diseases and chronic inflammation. Pharmacological modulation includes inhibitors of SLC7A11, such as erastin and sulfasalazine, to induce ferroptosis, and MRP inhibitors like MK-571 to sensitize tumors to chemotherapy.

Other names

Glutathione transport systemGSH transport machineryGamma-glutamyl cycleSystem xC-MRP-mediated exportSLC7A11/ABCC1/GGT1 system

Inhibition of cystine/glutamate exchange (SLC7A11), inhibition of ATP-dependent glutathione efflux (MRPs), and inhibition of gamma-glutamyl bond cleavage (GGT1) to modulate intracellular glutathione levels and redox state.