Glutathione biosynthesis and cellular redox systems (GSH system) (GSH system)

The glutathione biosynthesis and cellular redox systems comprise a complex network of enzymes and transporters that maintain the intracellular balance of reduced glutathione (GSH), the most abundant non-protein thiol in eukaryotic cells [Source: NIH/NCBI]. The system is primarily governed by the rate-limiting enzyme glutamate-cysteine ligase (GCL) and the cystine/glutamate transporter SLC7A11, which provides the necessary cysteine precursor [Source: PubMed]. These systems are essential for protecting cells against oxidative stress by neutralizing reactive oxygen species (ROS) and detoxifying electrophilic compounds through glutathione S-transferases (GSTs) [Source: StatPearls]. In oncology, many tumors overexpress components of this system to survive high levels of metabolic stress and resist ferroptosis, leading to the development of inhibitors like erastin and buthionine sulfoximine (BSO) [Source: Nature Reviews Cancer]. Conversely, deficiencies in glutathione metabolism are implicated in neurodegenerative diseases such as Parkinson's and Alzheimer's, where oxidative damage contributes to neuronal loss [Source: Wikipedia]. Therapeutic strategies often focus on either depleting GSH to sensitize cancer cells or supplementing GSH precursors like N-acetylcysteine (NAC) to provide cytoprotection in inflammatory or toxic conditions [Source: PubChem].

Other names

Glutathione metabolismGSH biosynthetic pathwayCellular antioxidant systemThiol-based redox systemGlutathione homeostasis

Modulation of cellular redox state through the inhibition of glutathione synthesis enzymes, blockade of cystine uptake transporters, or supplementation of thiol precursors to alter antioxidant capacity.