L-Glutathione (γ-L-glutamyl-L-cysteinyl-glycine) is a low-molecular-weight tripeptide ubiquitously synthesized in eukaryotic cells and extensively studied in biochemical and molecular biology research as a central regulator of intracellular redox balance. In laboratory systems, glutathione functions as a primary thiol-based redox buffer and participates in enzymatic detoxification, protein folding quality control, and maintenance of cellular redox homeostasis.

The following description is limited exclusively to mechanistic, cellular, and preclinical research contexts, with emphasis on glutathione’s biochemical properties, molecular pathways, and experimentally observed roles in in-vitro systems and animal models.

Molecular Formula: C₁₀H₁₇N₃O₆S
Molecular Weight: 307.33 g/mol
PubChem CID: 124886
CAS No: 170-18-8
Alternative Names: Glutathione, GSH

Source: PubChem

The cysteine thiol group confers redox activity, enabling reversible oxidation–reduction cycling between reduced (GSH) and oxidized (GSSG) states. This property underlies glutathione’s central role in redox-sensitive enzymatic systems, including glutathione peroxidases, reductases, and transferases.

L-Glutathione is routinely utilized in laboratory research investigating:

• Cellular redox buffering and oxidative stress modeling

• Enzymatic detoxification pathways (e.g., conjugation reactions mediated by glutathione-dependent enzymes)

• Protein folding and disulfide bond formation within the endoplasmic reticulum

• Ferroptosis and lipid peroxidation signaling in cell-death research

• Neurochemical redox modulation and glial signaling studies

• Redox-dependent regulation of immune cell activation and proliferation in vitro

Glutathione is synthesized via a two-step ATP-dependent pathway involving γ-glutamylcysteine synthetase and glutathione synthetase. The intracellular GSH:GSSG ratio is widely used in experimental biology as an indicator of cellular redox state.

Source: PubMed

Through direct electron donation, glutathione neutralizes reactive oxygen and nitrogen species and supports recycling of other redox-active molecules. In addition, glutathione participates in redox-sensitive signaling pathways that influence transcription factor activity, mitochondrial function, and programmed cell-death cascades.

Extensive preclinical literature demonstrates that experimentally induced glutathione depletion alters oxidative stress sensitivity, mitochondrial integrity, and genome stability in cell culture and animal models[1], [2]. Such models are frequently used to investigate mechanisms of cellular senescence, ferroptosis, and redox-dependent transcriptional regulation.

In nervous system research, glutathione availability has been shown to modulate iron-dependent lipid peroxidation pathways and glial signaling mechanisms associated with neuronal vulnerability in animal models[10], [11]. Additional studies describe glutathione-dependent regulation of retinal support cells and lens protein redox maintenance in ocular biology research[12]–[15].

In oncology-focused laboratory research, glutathione metabolism is examined as a determinant of cellular resistance to oxidative and xenobiotic stress, with context-dependent effects on tumor cell survival and experimental treatment resistance models[8], [9].

L-Glutathione supplied for laboratory use is intended for controlled experimental applications requiring sequence-verified material. Analytical characterization commonly includes identity confirmation by mass spectrometry and purity assessment via chromatographic methods.

Researchers are responsible for performing appropriate incoming quality control and validation prior to use in redox assays, enzymatic studies, protein folding experiments, or animal model research.

1. H. J. Forman, H. Zhang, and A. Rinna, “Glutathione: overview of its protective roles, measurement, and biosynthesis,” Mol. Aspects Med., vol. 30, no. 1–2, pp. 1–12, Apr. 2009, doi: 10.1016/j.mam.2008.08.006.
2. G. Teskey et al., “Glutathione as a Marker for Human Disease,” Adv. Clin. Chem., vol. 87, pp. 141–159, 2018, doi: 10.1016/bs.acc.2018.07.004.
3. S. Tsunoda et al., “Intact protein folding in the glutathione-depleted endoplasmic reticulum implicates alternative protein thiol reductants,” eLife, vol. 3, p. e03421, Jul. 2014, doi: 10.7554/eLife.03421.
4. D. A. Hudson, S. A. Gannon, and C. Thorpe, “Oxidative protein folding: from thiol-disulfide exchange reactions to the redox poise of the endoplasmic reticulum,” Free Radic. Biol. Med., vol. 80, pp. 171–182, Mar. 2015, doi: 10.1016/j.freeradbiomed.2014.07.037.
5. H. R. Freitas and R. A. de M. Reis, “Glutathione induces GABA release through P2X7R activation on Müller glia,” Neurogenesis, vol. 4, no. 1, p. e1283188, Feb. 2017, doi: 10.1080/23262133.2017.1283188.
6. J. H. Wu and G. Batist, “Glutathione and glutathione analogues; therapeutic potentials,” Biochim. Biophys. Acta, vol. 1830, no. 5, pp. 3350–3353, May 2013, doi: 10.1016/j.bbagen.2012.11.016.
7. T. S. Nagapan, W. N. Lim, D. F. Basri, and A. R. Ghazali, “Oral supplementation of L-glutathione prevents ultraviolet B-induced melanogenesis and oxidative stress in BALB/c mice,” Exp. Anim., vol. 68, no. 4, pp. 541–548, Nov. 2019, doi: 10.1538/expanim.19-0017.
8. A. Bansal and M. C. Simon, “Glutathione metabolism in cancer progression and treatment resistance,” J. Cell Biol., vol. 217, no. 7, pp. 2291–2298, Jul. 2018, doi: 10.1083/jcb.201804161.
9. N. Traverso et al., “Role of glutathione in cancer progression and chemoresistance,” Oxid. Med. Cell. Longev., vol. 2013, p. 972913, 2013, doi: 10.1155/2013/972913.
10. T. Homma and J. Fujii, “Application of Glutathione as Anti-Oxidative and Anti-Aging Drugs,” Curr. Drug Metab., vol. 16, no. 7, pp. 560–571, 2015, doi: 10.2174/1389200216666151015114515.
11. P. Maher, “The effects of stress and aging on glutathione metabolism,” Ageing Res. Rev., vol. 4, no. 2, pp. 288–314, May 2005, doi: 10.1016/j.arr.2005.02.005.
12. E. Ganea and J. J. Harding, “Glutathione-related enzymes and the eye,” Curr. Eye Res., vol. 31, no. 1, pp. 1–11, Jan. 2006, doi: 10.1080/02713680500477347.
13. V. N. Reddy, “Glutathione and its function in the lens–an overview,” Exp. Eye Res., vol. 50, no. 6, pp. 771–778, Jun. 1990, doi: 10.1016/0014-4835(90)90127-g.
14. V. N. Reddy and F. J. Giblin, “Metabolism and function of glutathione in the lens,” Ciba Found. Symp., vol. 106, pp. 65–87, 1984, doi: 10.1002/9780470720875.ch5.
15. M. A. Babizhayev, “New concept in nutrition for the maintenance of the aging eye redox regulation and therapeutic treatment of cataract disease; synergism of natural antioxidant imidazole-containing amino acid-based compounds, chaperone, and glutathione boosting agents: a systemic perspective on aging and longevity emerged from studies in humans,” Am. J. Ther., vol. 17, no. 4, pp. 373–389, Aug. 2010, doi: 10.1097/MJT.0b013e3181d6b6c3.
16. S. Zhu, D. Makosa, B. F. Miller, and T. M. Griffin, “Glutathione as a Mediator of Cartilage Oxidative Stress Resistance and Resilience During Aging and Osteoarthritis,” Connect. Tissue Res., vol. 61, no. 1, pp. 34–47, Jan. 2020, doi: 10.1080/03008207.2019.1665035.
17. S. Weschawalit, S. Thongthip, P. Phutrakool, and P. Asawanonda, “Glutathione and its antiaging and antimelanogenic effects,” Clin. Cosmet. Investig. Dermatol., vol. 10, pp. 147–153, 2017, doi: 10.2147/CCID.S128339.
18. W. Dilokthornsakul, T. Dhippayom, and P. Dilokthornsakul, “The clinical effect of glutathione on skin color and other related skin conditions: A systematic review,” J. Cosmet. Dermatol., vol. 18, no. 3, pp. 728–737, Jun. 2019, doi: 10.1111/jocd.12910.
19. W. Dröge and R. Breitkreutz, “Glutathione and immune function,” Proc. Nutr. Soc., vol. 59, no. 4, pp. 595–600, Nov. 2000, doi: 10.1017/s0029665100000847.
20. R. Sinha et al., “Oral supplementation with liposomal glutathione elevates body stores of glutathione and markers of immune function,” Eur. J. Clin. Nutr., vol. 72, no. 1, pp. 105–111, Jan. 2018, doi: 10.1038/ejcn.2017.132.

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