Oxidized glutathione (Glutathione disulfide) (GSSG)

Oxidized glutathione (GSSG) is the disulfide form of the tripeptide glutathione (GSH), produced when two GSH molecules are oxidized by reactive oxygen species or through the enzymatic action of glutathione peroxidase [1]. In healthy physiological conditions, GSSG is efficiently reduced back to GSH by the enzyme glutathione reductase using NADPH as a cofactor, maintaining a high GSH:GSSG ratio that serves as a vital buffer for cellular redox homeostasis [2]. An elevation in GSSG levels is a primary indicator of oxidative stress and is frequently observed in chronic diseases such as cancer, neurodegeneration, and various inflammatory conditions [4]. In the context of drug development, GSSG and its pharmaceutical formulations (e.g., NOV-002) act as redox-modulating agents that can trigger S-glutathionylation of critical signaling proteins like p21ras and various kinases [3]. This mechanism allows GSSG to influence cellular processes including apoptosis, hematopoiesis, and immune cell activation, making it a target for sensitizing tumor cells to chemotherapy or protecting bone marrow during treatment [5]. While GSSG is primarily a metabolite, its therapeutic administration seeks to bypass the normal intracellular redox regulation to achieve specific signaling outcomes in diseased tissues. Sources: [1] PubChem. 'Glutathione disulfide'. https://pubchem.ncbi.nlm.nih.gov/compound/Glutathione-disulfide [2] Forman, H. J., et al. (2009). 'Glutathione: Overview of its protective roles, measurement, and biosynthesis.' Molecular Aspects of Medicine. [3] Towner, R. A., et al. (2010). 'NOV-002, a glutathione disulfide mimetic.' Clinical Oncology Reviews. [4] Franco, R., et al. (2007). 'The central role of glutathione in the pathophysiology of human diseases.' Archives of Physiology and Biochemistry. [5] Lushchak, V. I. (2012). 'Glutathione Homeostasis and Functions: Potential Targets for Medical Interventions.' Journal of Amino Acids.

Other names

Glutathione disulfideL-Glutathione oxidizedGSSGDiglutathioneN,N'-[dithiobis(1-oxo-3,1-propanediyl)]bis[L-glutamic acid]

Modulation of cellular redox state and induction of protein S-glutathionylation to regulate signaling pathways such as MAPK and NF-kappaB, which influences cell proliferation and immune response.