This is a working overview of GSH, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-08-16 and is reviewed periodically as new material appears.
In its reduced form, glutathione carries a sulfhydryl group that can donate electrons. This property lets it act as a major cellular antioxidant and redox buffer. Glutathione peroxidase uses it to reduce hydrogen peroxide and lipid peroxides, while glutathione reductase regenerates the reduced form using NADPH. The ratio of reduced glutathione to glutathione disulfide is widely used as an indicator of oxidative stress, though the ratio changes with compartment, cell type, and sample handling. Oxidized glutathione can also form mixed disulfides with proteins, affecting their activity.
Glutathione supports detoxification by conjugating reactive electrophiles through glutathione S-transferases. The resulting conjugates are processed and exported, often after further metabolism. It also stores cysteine, transports amino acids across membranes through the gamma-glutamyl cycle, and assists in the maturation of iron-sulfur clusters and some prostaglandins. In plants, animals, and many microbes, the molecule appears in similar roles, but concentrations vary enormously between tissues. Liver, kidney, and red blood cells tend to contain high amounts, while blood plasma contains much less.
Glutathione is a small tripeptide built from glutamate, cysteine, and glycine. The peptide bond between glutamate and cysteine uses the gamma-carboxyl group, a linkage that resists ordinary peptidases. Cells make it in two ATP-dependent steps: gamma-glutamylcysteine synthetase joins glutamate and cysteine, then glutathione synthetase adds glycine. The pathway is feedback-inhibited by glutathione itself, so intracellular levels tend to stay within a narrow range. Because cysteine is often limiting, sulfur amino acid supply influences how much glutathione a cell can produce.
Glutathione is a small sulfur-containing peptide built from glutamic acid, cysteine, and glycine. Its distinctive feature is a gamma-glutamyl bond between glutamate's side-chain carboxyl group and cysteine's amino group. This linkage resists ordinary peptidases and helps the molecule remain stable inside cells. The reduced thiol form, often abbreviated GSH, is the dominant intracellular species. The oxidized disulfide dimer, GSSG, forms when two reduced molecules link through their cysteine sulfur atoms. The balance between these forms is a common redox indicator.
In living systems, glutathione occurs in millimolar concentrations in many cell types, while extracellular levels are generally much lower. The liver holds a substantial share of the body's total pool, and the molecule participates in reduction, detoxification, and amino acid transport. It also serves as a cofactor for enzymes such as glutathione peroxidase and glutathione S-transferase. Because the cysteine residue supplies a reactive thiol, glutathione can donate electrons and become oxidized. Cells regenerate reduced glutathione through glutathione reductase using NADPH.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for the neutral molecule |
| Appearance | White crystalline powder | Often hygroscopic; protect from moisture |
| Water solubility | Soluble in water | Reported values vary with purity and form |
| Alternative names | GSH, reduced glutathione | GSH specifies the thiol form |
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its glutamate-cysteine linkage uses the gamma-carboxyl group of glutamate, a feature that resists standard peptidases. The cysteine residue provides a thiol group, which gives the molecule its reducing character. In cells, glutathione is often the most abundant small-molecule thiol, with concentrations varying widely by tissue and compartment. It exists mainly in a reduced form called GSH, while oxidation produces a disulfide-linked dimer called GSSG.
Biosynthesis proceeds in two ATP-dependent steps. First, glutamate-cysteine ligase joins glutamate and cysteine. Second, glutathione synthetase adds glycine to the intermediate. The pathway is regulated by cysteine availability, enzyme expression, and feedback inhibition by glutathione itself. Liver tissue has a particularly high capacity for synthesis and export. Because the molecule is made inside cells, circulating glutathione reflects a balance of release, uptake, and breakdown rather than simple dietary supply.
Functionally, glutathione supports redox balance by donating electrons and becoming oxidized. It also serves as a cofactor for enzymes such as glutathione peroxidases and glutathione S-transferases. These enzymes participate in peroxide reduction and in conjugation reactions that help process reactive molecules. Separate from antioxidant roles, glutathione can modify protein cysteines through S-glutathionylation, influencing enzyme activity and signaling. Research continues to examine how these chemical roles translate into whole-organism effects.
Enzymatic recycling assays provide a complementary approach for total glutathione. In these methods, glutathione reductase reduces oxidized glutathione while a thiol-reactive reagent, such as 5,5'-dithiobis(2-nitrobenzoic acid), produces a colored product. The reaction cycles between reduced and oxidized forms, amplifying the signal. Spectrophotometric or fluorometric detection can then estimate concentration. Distinguishing reduced glutathione from glutathione disulfide often requires separate aliquots, masking agents, or chromatographic separation, and the choice affects reported values.
Storage conditions strongly influence glutathione stability. The solid reduced form is commonly kept desiccated at or below minus twenty degrees Celsius, protected from light and moisture. Aqueous solutions are less stable because the thiol group reacts with dissolved oxygen, and oxidation accelerates at neutral or alkaline pH. Acidic solutions and oxygen-free handling can slow degradation, but repeated freeze-thaw cycles should be avoided. Researchers often verify concentration before use, because apparent losses can arise from oxidation or water uptake.
=== Food === Protein hydrolysis release savory free amino acids (especially glutamic acid) and peptides. Hydrolyzed vegetable protein and yeast extract are commonly used as flavor enhancers (sources of umami) as a result. The non-protein components in these products also contribute to the flavor. Protein hydrolysis also increases their digestibility and rate of digestion. Some hydrolyzed beef protein powders are used for specialized diets for athletes. Protein hydrolysis can be used to destroy epitopes involved in recognition by antibodies involved in allergy. "An allergen must have at least 2 IgE-binding epitopes, and each epitope must be at least 15 amino acid residues long, to trigger a type 1 hypersensitivity reaction." As a result, it has been used to reduce the allergenicity of infant formula: Reducing the size of cow milk proteins in the formula makes it more suitable for consumption by babies suffering from milk protein intolerance. The US FDA has approved a label for this usage of partially-hydrolyzed proteins in 2017, but a meta-analysis published the same year shows insufficient evidence for this use.
Many children who experience abuse go on to develop an addiction in adolescence or adult life. This pathway towards addiction that is opened through stressful experiences during childhood can be avoided by a change in environmental factors throughout an individual's life and opportunities of professional help. Social and environmental influences include family dynamics, early and adverse experiences, socioeconomic status, peer networks, and cultural norms. Adverse childhood exposures and maladaptive developmental trajectories are robust environmental influences on the development of alcohol use disorder, and adverse childhood experiences are recognized more generally as a social determinant of vulnerability to substance use disorders. Social networks exert a bidirectional influence, while wider sociocultural factors (including public-health control policies and the social determinants of health) shape both exposure and outcome. Because social risk factors are modifiable, prevention that targets them in childhood and adolescence can reduce the risk of later disorder. Together, these levels of analysis present addiction as a dynamic condition emerging from the interaction of neurobiological processes, individual psychological traits and broader social environments. Social factors act largely through chronic stress, peer modeling, socioeconomic constraint and the availability of substances, influencing both the likelihood of exposure and the risk of escalation or relapse.
=== Reduction === Alloxan may be reduced to dialuric acid, which has a reductone structure, similar to ascorbic acid (Vitamin C). However, unlike ascorbic acid, alloxan and dialuric acid have strong pro-oxidant physiological effects. A dimeric derivative alloxantin can be prepared by partial reduction of alloxan with hydrogen sulfide.
Sources: en.wikipedia.org
The Soviet Union adopted a command economy, whereby production and distribution of goods were centralized and directed by the government. For the overwhelming majority of its existence, the USSR did not use GDP or GNP to measure its economy, instead relying on the Material Product System. The first Bolshevik experience with a command economy was the policy of war communism, which involved the nationalization of industry, centralized distribution of output, coercive or forced requisition of agricultural production, and attempts to eliminate money circulation, private enterprises and free trade. The barrier troops were also used to enforce Bolshevik control over food supplies in areas controlled by the Red Army, a role which soon earned them the hatred of the Russian civilian population. After the severe economic collapse, Lenin replaced war communism by the New Economic Policy (NEP) in 1921, legalizing free trade and private ownership of small businesses. The economy steadily recovered as a result. After a long debate among the members of the Politburo about the course of economic development, by 1928–1929, upon gaining control of the country, Stalin abandoned the NEP and pushed for full central planning, starting forced collectivization of agriculture and enacting draconian labour legislation. Resources were mobilized for rapid industrialization, which significantly expanded Soviet capacity in heavy industry and capital goods during the 1930s. The primary motivation for industrialization was preparation for war, mostly due to distrust of the outside capitalist world.
== Campus == The hospital campus comprises three interconnected medical blocks. A helicopter pad is located on the roof of the tallest block. The newest block was completed in 2014. It was designed by K.ITO Architects & Engineers.
Sigma-Aldrich (part of MilliporeSigma) is a brand operating within an American chemical, life science, and biotechnology company owned by the multinational chemical conglomerate Merck Group. The life sciences business of Merck Group operates as MilliporeSigma in the United States. Sigma-Aldrich was created in 1975 by the merger of Sigma Chemical Company and Aldrich Chemical Company. It grew through various acquisitions until it had over 9,600 employees and was listed on the Fortune 1000. The company has two United States headquarters, in St. Louis and Burlington, MA and has operations in approximately 40 countries. In 2015, the multinational chemical conglomerate Merck Group acquired Sigma-Aldrich for $17 billion. The company is currently a part of Merck's life science business and in combination with Merck's earlier acquired Millipore, operates as MilliporeSigma. It is headquartered in Burlington, Massachusetts, United States.
Sources: en.wikipedia.org
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.
It reflects the balance between oxidant exposure and antioxidant capacity. The ratio is not a direct clinical diagnosis and depends on the tissue and sample method.
No. It also participates in detoxification, amino acid transport, and protein modification. Its roles vary by cell type and compartment.
It is a tripeptide rather than a full protein. Proteins generally contain many amino acids joined by alpha-peptide bonds, while glutathione has three residues and an unusual gamma-glutamyl linkage. That structure affects how enzymes recognize and break it down.