Glutathione Metabolism and Cellular Redox Homeostasis

Glutathione is the principal intracellular thiol-based antioxidant, present in millimolar concentrations across eukaryotic cells. Its unique tripeptide structure of glutamate, cysteine and glycine underpins a thiol redox couple that detoxifies reactive oxygen and nitrogen species, contributes to xenobiotic clearance, and regulates protein thiol modifications. Glutathione is synthesised in the cytosol via consecutive enzyme-catalysed steps and distributed to subcellular compartments, where it maintains redox homeostasis through reversible conversion between its reduced (GSH) and oxidised (GSSG) forms. This balance underlies cellular survival by supporting antioxidant defence, signal transduction and regulation of cell death pathways. Perturbations of glutathione metabolism are implicated in ageing, neurodegeneration, cardiovascular disease and cancer, where impaired GSH levels contribute to oxidative stress, aberrant ferroptotic cell death and altered immune responses. Therapeutic strategies targeting glutathione synthesis, regeneration and depletion have thus emerged as promising approaches to modulate redox balance in diverse pathological contexts.

Research from Nature Portfolio

Recent studies have demonstrated that intermittent dietary methionine deprivation can potentiate lipid peroxidation–driven ferroptosis in tumour cells by modulating CHAC1 expression, a glutathione-degrading enzyme. Short cycles of methionine restriction accelerate CHAC1 transcription, leading to transient GSH depletion that sensitises cancer cells to ferroptotic death. Conversely, prolonged deprivation activates adaptive mechanisms that preserve GSH levels, highlighting the importance of timing in dietary interventions. In preclinical models, combining intermittent methionine deprivation with inhibitors of the cystine–glutamate antiporter system and immune checkpoint blockade enhances antitumour efficacy, indicating a multifaceted role for glutathione metabolism in cancer therapy.

Glutathione Metabolism and Cellular Redox Homeostasis publication trend

The graph below shows the total number of articles in glutathione metabolism and cellular redox homeostasis across all publications each year (not limited to Nature Index journals).

Technical terms

Glutathione (GSH): A tripeptide antioxidant composed of glutamate, cysteine and glycine that neutralises reactive species and maintains cellular redox balance.

Oxidised glutathione (GSSG): The disulfide form formed by two GSH molecules upon reduction of reactive oxygen species, reversible to GSH via glutathione reductase.

Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen, including peroxides and superoxide, that can damage biomolecules.

Redox homeostasis: The dynamic equilibrium between oxidation and reduction reactions essential for normal cellular function and signalling.

Ferroptosis: A form of regulated cell death driven by iron-dependent lipid peroxidation when antioxidant defences, notably glutathione, are compromised.

CHAC1: An endoplasmic reticulum stress–induced enzyme that degrades glutathione, modulating GSH levels and ferroptotic susceptibility.

References

1. Intermittent dietary methionine deprivation facilitates tumoral ferroptosis and synergizes with checkpoint blockade. Nature Communications (2023).
2. Glutathione system enhancement for cardiac protection: pharmacological options against oxidative stress and ferroptosis. Cell Death & Disease (2023).
3. Glutathione: new roles in redox signaling for an old antioxidant. Frontiers in Pharmacology (2014).
4. Role of Glutathione in Cancer: From Mechanisms to Therapies. Biomolecules (2020).
5. Glutathione in the Brain. International Journal of Molecular Sciences (2021).