Cellular glutathione homeostasis system (GSH system) (GSH system)

The cellular glutathione homeostasis system is a fundamental biochemical network responsible for maintaining the balance of reduced glutathione (GSH), the primary endogenous antioxidant in human cells (NIH, PMC4684116). This system comprises biosynthetic enzymes such as glutamate-cysteine ligase (GCL) and glutathione synthetase (GSS), recycling enzymes like glutathione reductase (GSR), and transport proteins like the cystine/glutamate antiporter (System Xc-) (UniProt P48506; PubMed 22595019). Its primary biological function is to neutralize reactive oxygen species (ROS) and detoxify electrophilic xenobiotics, thereby protecting cellular components from oxidative damage (PubChem, CID 124886). In the context of disease, many cancer types exploit this system by upregulating GSH production to confer resistance to chemotherapy and radiation (PubMed 25611151). Conversely, a deficiency in GSH homeostasis is linked to the progression of neurodegenerative diseases and chronic inflammation (PubMed 11368914). Pharmacological intervention involves either replenishing GSH using precursors like N-acetylcysteine or depleting it using inhibitors like buthionine sulfoximine (BSO) to sensitize tumor cells to treatment (PubMed 7723810). Additionally, targeting the System Xc- transporter with drugs like erastin can induce ferroptosis, a form of regulated cell death particularly relevant in oncology (PubMed 22595019). Overall, the glutathione system represents a critical node in cellular metabolism with significant therapeutic potential across oncology and neurology.

Other names

Glutathione metabolic pathwayGSH redox systemGlutathione antioxidant systemGSH homeostasis

Modulation of cellular redox state through the inhibition of rate-limiting biosynthetic enzymes, blockade of precursor transport, or direct supplementation of antioxidant molecules (PubMed 22595019; PubMed 7723810).