Everything below concerns thiol. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-11-25. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Accurate measurement of glutathione begins with careful sample handling. Because GSH oxidizes rapidly to GSSG, samples must be processed quickly or frozen immediately. Acid precipitation with metaphosphoric acid or perchloric acid is common; it lowers pH, precipitates proteins, and helps preserve the reduced form. Chelating agents such as EDTA can limit metal-catalyzed oxidation. For whole blood, hemolysis releases glutathione from erythrocytes, so plasma and serum values differ substantially from whole blood values.
Several analytical methods can quantify glutathione, including high-performance liquid chromatography (HPLC) with UV or fluorescence detection for separating GSH and GSSG. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) offers higher specificity and sensitivity, often detecting nanomolar concentrations. The enzymatic recycling assay, often called the Tietze method, measures total glutathione by coupling reduction of GSSG to a colorimetric or fluorometric readout. Capillary electrophoresis and electrochemical detection are also used in specialized laboratories. Each method has distinct advantages and limitations regarding throughput, cost, and susceptibility to interference.
Interpreting glutathione measurements requires attention to pre-analytical variables. The GSSG concentration in a sample can rise artificially during storage or processing, making the GSH/GSSG ratio unreliable if not controlled. Reference ranges vary by specimen type, assay, and population, so comparisons across studies are difficult. Plasma glutathione is low and sensitive to hemolysis, while whole blood reflects primarily erythrocyte content. Many studies measure total glutathione rather than the reduced and oxidized forms separately, which limits conclusions about redox status.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione (reduced form) | Often abbreviated GSH |
| Chemical class | Tripeptide | Contains glutamate, cysteine, and glycine |
| Molecular formula | C10H17N3O6S | Refers to the reduced form |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical laboratory-grade solid |
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It contains an unusual gamma-glutamyl bond between glutamate and cysteine, which resists cleavage by many peptidases. The reduced form, GSH, carries a thiol group on cysteine and is the dominant intracellular form in most cells. Its structure allows it to participate in redox reactions and to serve as a sulfur donor. The oxidized form, GSSG, consists of two GSH molecules joined by a disulfide bond.
In cells, glutathione helps maintain the reducing environment of the cytosol and supports enzymes that counteract reactive oxygen species. It acts as a cofactor for glutathione peroxidases, which reduce hydrogen peroxide and lipid peroxides, and for glutathione S-transferases, which conjugate electrophiles. The ratio of GSH to GSSG is often used as an indicator of oxidative stress, although the ratio can vary by compartment and cell type. Glutathione also stores cysteine, an amino acid that can be limiting for protein synthesis and antioxidant defense.
Glutathione is a small tripeptide composed of glutamate, cysteine, and glycine, with the unusual gamma-glutamyl linkage between glutamate and cysteine. Its cysteine thiol group makes it a major non-enzymatic antioxidant in cells. The reduced form, GSH, predominates in most intracellular compartments, while the oxidized disulfide form, GSSG, is produced when GSH reduces reactive oxygen species. Intracellular concentrations often reach millimolar levels, whereas plasma concentrations are much lower, typically in the low micromolar range. This gradient reflects active synthesis, transport, and consumption rather than passive distribution.
Synthesis occurs in two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine to complete the tripeptide. The pathway is feedback-inhibited by GSH and limited by cysteine availability, so cysteine supply often constrains production. Once formed, GSH participates in redox buffering, xenobiotic conjugation, and protein glutathionylation. Glutathione peroxidase uses GSH to reduce hydrogen peroxide and lipid peroxides, yielding GSSG, while glutathione reductase regenerates GSH using NADPH. Glutathione S-transferases conjugate electrophiles to GSH, supporting detoxification and excretion.
In cells, glutathione exists mainly in a reduced form called GSH. When two GSH molecules react, they form oxidized glutathione, or GSSG, which contains a disulfide bond. The ratio of GSH to GSSG is often used as an indicator of oxidative stress. Enzymes such as glutathione peroxidase and glutathione reductase help cycle the molecule between these two states. This cycling supports antioxidant defense, detoxification of reactive molecules, and regulation of certain signaling pathways.
Glutathione is present in most tissues, with especially high concentrations in the liver. It also serves as a cofactor for some enzymes and helps transport amino acids across cell membranes. In plants and microorganisms, glutathione contributes to stress responses and metal handling. The molecule is synthesized in two ATP-dependent steps, first producing gamma-glutamylcysteine and then adding glycine. Because cysteine availability often limits synthesis, dietary and metabolic factors can influence glutathione levels. Research continues to examine how these levels relate to health and disease.
== Awards == Barran was awarded the 2009 Joseph Black award, and the 2020 Theophillus Redwood Award from the Royal Society of Chemistry Analytical Division. Along with a team of researchers 'NosetoDiagnose' she won the Horizon Prize from the Royal Society of Chemistry 2021. She is ranked #3 in the "Human Health Heroes" field on the 2024 Analytical Scientist Power List.
Main topics include mitigation of direct emissions of greenhouse gases in refrigeration, refrigerant charge reduction in refrigerating systems, magnetic cooling, life cycle climate performance evaluation, and refrigerant system safety.
=== 1970s === The scientific and medical markets have always been important for Edwards. The introduction of X-ray technology required the use of a vacuum. Vacuum technology also played an important role in the development of neuroimaging (brain scanners), like MRI, CT, and PET scanners. The first home computers were brought to the market in the 1970s and the development of computer technology has been unstoppable ever since. The mass production of CRT displays and integrated circuits necessitated electronic companies to scale up, with vacuum installations becoming bigger and demand for vacuum purity increasing. In the 1970s, Edwards Vacuum also collaborated with Seiko Seiki for the invention of magnetically suspended turbopumps. These molecular turbopumps use magnetically levitated bearings, which eliminate the risk of vacuum contamination, require less maintenance, and feature lower noise and vibration levels. This type of technology is particularly suitable for scientific applications and the harsh processes in semiconductor manufacturing. The newly emerged dry pumps and turbomolecular pumps supported innovation in the scientific instrument markets over the next couple of decades. The scientific instrument market is now the second biggest market for Edwards Vacuum, after the semiconductor and electronics industry.
Sources: en.wikipedia.org
During the COVID-19 pandemic, Pritzker took several measures to mitigate the pandemic in Illinois. On March 13, 2020, Pritzker declared that public and private schools in Illinois would be closed from March 17 through March 31. On March 15, he announced that all bars and restaurants must close until March 30. Restaurant businesses with delivery and takeout options would still be able to serve. On March 16, 2020, Pritzker issued an executive order limiting permitted crowd sizes to 50 people. Despite pressure from Chicago election officials, he refused to postpone the state's March 17 primary elections, since it was not something that he had the authority to do. On March 20, 2020, Pritzker issued a stay-at-home order to take effect the next day. Under this order, all non-essential businesses were required to close while essential businesses such as grocery stores, gas stations, hospitals, pharmacies remained open. The order originally ended on April 8. The state government coordinated a public health response. The State of Illinois worked with the U.S. Department of Health and Human Services, Wal-Mart, and Walgreens to provide testing sites in Illinois's hardest-hit communities. By June, amid unrest by some municipalities unhappy with Pritzker's lockdown orders, Mayor Keith Pekau of Orland Park, a suburb southwest of Chicago, and a local restaurateur sued Pritzker in federal court, alleging that the lockdown orders violated state law and the state constitution. U.S. District Judge Andrea Wood ruled against the plaintiffs, allowing the lockdown orders to stay in place.
== Honors == Robert M. Scarborough Award for Excellence in Medicinal Chemistry, ACS Division of Medicinal Chemistry (2009) Inducted as an American Chemical Society Fellow (2011) Alfred Burger Award in Medicinal Chemistry, American Chemical Society (2014) Inducted into the American Chemical Society Division of Medicinal Chemistry Hall of Fame (2014) Edward E. Smissman Award in Medicinal Chemistry, ACS Division of Medicinal Chemistry (2019) IUPAC–Richter Prize in Medicinal Chemistry (2020)
== Treatment == The treatment to battle the disease chorea-acanthocytosis is completely symptomatic. For example, botulinum toxin injections can help to control orolingual dystonia. Deep brain stimulation is a treatment that has varied effects on the people suffering from the symptoms of this disease, for some it has helped in a large way and for other people it did not help whatsoever, it is more effective on specific symptoms of the disease. Patients with chorea-acanthocytosis should undergo a cardiac evaluation every five years to look for cardiomyopathy.
Sources: en.wikipedia.org
== Hfe knockout mice == It is possible to delete part or all of a gene of interest in mice (or other experimental animals), as a means of studying the function of the gene and its protein. Such mice are called "knockouts" with respect to the deleted gene. Hfe is the mouse equivalent of the human hemochromatosis gene HFE. The protein encoded by HFE is Hfe. Mice homozygous (two abnormal gene copies) for a targeted knockout of all six transcribed Hfe exons are designated Hfe−/−. Iron-related traits of Hfe−/− mice, including increased iron absorption and hepatic iron loading, are inherited in an autosomal recessive pattern. Thus, the Hfe−/− mouse model simulates important genetic and physiological abnormalities of HFE hemochromatosis. Other knockout mice were created to delete the second and third HFE exons (corresponding to α1 and α2 domains of Hfe). Mice homozygous for this deletion also had increased duodenal iron absorption, elevated plasma iron and transferrin saturation levels, and iron overload, mainly in hepatocytes. Mice have also been created that are homozygous for a missense mutation in Hfe (C282Y). These mice correspond to humans with hemochromatosis who are homozygous for HFE C282Y. These mice develop iron loading that is less severe than that of Hfe−/− mice.
== General mammalian research == Migliaro Petroni et al. (2026) describe tracks of a small-bodied, fast-moving mammal from the Upper Cretaceous (Maastrichtian) strata of the Yacoraite Formation (Argentina), assigned to the ichnotaxon Brasilichnium cf. saltatorium and extending known stratigraphic distribution of the ichnogenus Brasilichnium. A new, diverse assemblage of teeth of Paleocene (Torrejonian) mammals is reported from the Tullock Member of the Fort Union Formation (Montana, United States) by Hovatter & Wilson Mantilla (2026). Evidence indicating that carbon isotope excursions and probable warming events during the Danian were associated with strong pulses of turnover of mammalian assemblages is reported from the study of the fossil record from the San Juan Basin (New Mexico, United States) and other basins in the Rocky Mountain Region is presented by Secord et al. (2026). Evidence from the study of teeth of Paleocene placentals from the Nanxiong, Qianshan and Chijiang basins (China), indicating that the studied mammals achieved high dental topographic variability during the first 10 million years of the Cenozoic and that the variability of their dental traits paralleled global and regional environmental changes, is presented by Tseng, Li & Ting (2026), who argue that living placental lineages might originate from phenotypically variable and functionally flexible ancestors such as the mammals from the studied assemblages from paleotropical Asia.
===== Classical ===== TH1 cells play an important role in classical macrophage activation as part of type 1 immune response against intracellular pathogens (such as intracellular bacteria) that can survive and replicate inside host cells, especially those pathogens that replicate even after being phagocytosed by macrophages. After the TCR of TH1 cells recognize specific antigen peptide-bound MHC class II molecules on macrophages, TH1 cells 1) secrete IFN-γ and 2) upregulate the expression of CD40 ligand (CD40L), which binds to CD40 on macrophages. These 2 signals activate the macrophages and enhance their ability to kill intracellular pathogens through increased production of antimicrobial molecules such as nitric oxide (NO) and superoxide (O2-). This enhancement of macrophages' antimicrobial ability by TH1 cells is known as classical macrophage activation, and the activated macrophages are known as classically activated macrophages, or M1 macrophages. The M1 macrophages in turn upregulate B7 molecules and antigen presentation through MHC class II molecules to provide signals that sustain T cell help. The activation of TH1 and M1 macrophage is a positive feedback loop, with IFN-γ from TH1 cells upregulating CD40 expression on macrophages; the interaction between CD40 on the macrophages and CD40L on T cells activate macrophages to secrete IL-12; and IL-12 promotes more IFN-γ secretion from TH1 cells.
Sources: en.wikipedia.org
Glutathione is a sulfur-containing tripeptide made from glutamate, cysteine, and glycine. It is found in most cells and participates in redox balance and detoxification reactions.
No. It is a tripeptide assembled from three amino acids. The term amino acid applies to the individual building blocks, not to the assembled molecule.
It is present in many tissues, with especially high amounts in liver. Intracellular concentrations are generally much higher than those found in blood plasma.
Glutathione oxidizes quickly when cells are disrupted or when samples sit at room temperature. Rapid processing or immediate freezing minimizes the conversion of GSH to GSSG. This step helps ensure that the measured ratio reflects the original biological state.