Everything below concerns GSH. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-08-19. Numbers and descriptions here follow the published literature rather than marketing material.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It occurs in nearly all living cells, with highest concentrations in liver, kidney, and red blood cells, and exists in reduced (GSH) and oxidized disulfide (GSSG) forms. The cysteine thiol group enables reversible oxidation and reduction reactions. This property makes glutathione a central participant in cellular redox balance. The balance between these forms is often used as an indicator of oxidative stress.
Glutathione synthesis proceeds in two ATP-dependent steps catalyzed by glutamate-cysteine ligase and glutathione synthetase. The first step joins glutamate and cysteine to form gamma-glutamylcysteine and is generally rate-limiting. The second step adds glycine to complete the tripeptide. Cysteine availability, feedback inhibition by glutathione, and oxidative conditions influence flux through this pathway. The pathway is conserved across many organisms, and degradation by gamma-glutamyl transpeptidase and related peptidases recycles amino acids for new synthesis.
Within cells, glutathione serves as a cofactor for glutathione peroxidases and glutathione S-transferases. These enzymes reduce hydrogen peroxide and organic peroxides or conjugate electrophilic compounds to the thiol group. The resulting conjugates can be exported and processed through mercapturic acid pathways. Glutathione also contributes to protein thiol homeostasis and to recycling of other antioxidants such as ascorbate. Its precise roles vary by tissue, and many regulatory effects observed in laboratory systems remain difficult to quantify in whole organisms.
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.
| Property | Value | Notes |
|---|---|---|
| Common name | Glutathione | Reduced form is abbreviated GSH |
| Chemical class | Tripeptide | Composed of glutamate, cysteine, and glycine |
| Molar mass | 307.32 g/mol | For reduced glutathione |
| CAS Registry Number | 70-18-8 | For reduced L-glutathione |
| Appearance | White crystalline powder | Typical solid reference material |
Glutathione is a small tripeptide made of glutamic acid, cysteine, and glycine. Its cysteine thiol group allows reversible oxidation and reduction, making it central to cellular redox chemistry. The reduced form, often abbreviated GSH, predominates inside most cells, while the oxidized disulfide form, GSSG, forms when two GSH molecules react. The ratio of GSH to GSSG is widely used as an indicator of oxidative stress in laboratory research, though it does not by itself diagnose a clinical condition.
Biosynthesis occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine, forming gamma-glutamylcysteine; glutathione synthetase then adds glycine to produce the complete tripeptide. Because the peptide bond from glutamate uses the gamma-carboxyl group, glutathione resists digestion by many ordinary peptidases. Tissues vary in synthesis capacity, and the liver generally contains high concentrations relative to many other organs. This uneven distribution contributes to organ-specific differences in redox buffering and affects how experimental results are interpreted across tissue types.
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.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its cysteine residue carries a thiol group, which allows the molecule to participate in reduction and oxidation reactions. The compound exists in most living cells, where the reduced form, often abbreviated GSH, is usually more abundant than the oxidized disulfide form, GSSG. Intracellular concentrations are commonly in the millimolar range, while extracellular concentrations are much lower. This uneven distribution supports its role as a major cellular redox buffer.
Cells synthesize glutathione through two ATP-dependent enzymatic steps. The first step combines glutamate and cysteine to form gamma-glutamylcysteine, catalyzed by glutamate-cysteine ligase. The second step adds glycine, producing the complete tripeptide, catalyzed by glutathione synthetase. Glutathione itself can inhibit the first enzyme, providing negative feedback when levels are high. Because cysteine is often limiting, its availability influences how quickly the pathway proceeds. These reactions occur in the cytosol, and the resulting glutathione can be distributed to other compartments.
=== Human growth hormone (hGH) === Human growth hormone is a naturally occurring hormone that is responsible for general body growth in both men and women. hGH helps the body protein while breaking down fat deposits. Too much hGH results in increased muscle mass.
A new Media Act was passed into law in 1967, merging the NRU and the NTS. The new organisation, the Nederlandse Omroep Stichting (Netherlands Broadcasting Service; NOS) was created on 29 May 1969. The NOS, as were its predecessors, was tasked with coordinating the whole public broadcasting system, as well as providing news and sports bulletins. It also inherited the technical and production facilities needed to make and broadcast radio and television programmes. All broadcasting members of the NRU and the NTS were made members of the NOS. By 1971 seven programming societies existed, each receiving part of the television licence fee and advertising revenue. Because of pillarization most represented various political and religious groups, although the largest, AVRO, was the most neutral. Twenty-seven smaller groups such as the Society for Sexual Reform received small time slots, as well as all parties represented in the Dutch Parliament. Societies produced their own programs, and purchased others from abroad. Besides news and sports, NOS produced children and educational programs for the one third of broadcast hours it filled. On 2 May 1977, a strike by sound engineers affected television news broadcasts. Upset viewers called on all broadcasters to resolve the situation. On 1 April 1980, the NOS launched its teletext service, in the framework of supplying news and information. It first experimented with Teletext in 1977. In 1981, on the 25th anniversary, the NOS aired its first televised youth news bulletin, called Jeugdjournaal.
== Cause == The cause of PAH is unknown. Idiopathic PAH (WHO group 1.1) is not associated with an underlying disease or exposure. It is estimated that 39-46% of those with PAH have the idiopathic variant. Group 1.2 PAH includes the variants that are heritable. Genetic variants or mutations in bone morphogenic protein receptor 2 (BMPR2) account for approximately 75-80% of cases of heritable PAH. BMPR2 mutations are also seen in 20% of idiopathic PAH. BMPR2 is a protein involved in endothelial cell (cells that line blood vessels) proliferation and remodeling. Other types of genes coding for proteins involved in BMPR2 signaling have also been implicated as causes of heritable PAH, such as activin A receptor type-2-like-1 ACVRL1, Endoglin (ENG), SMAD genes encoding for SMAD transcription factors involved in downstream BMPR2 signaling and cell growth including Smad1, Smad4 and Smad9. KCNK3 encodes for a potassium channel which regulates membrane potential across cells thus controlling vascular tone. Eukaryotic translation initiation factor 2 alpha kinase 4 (E1F2AK4) is mutated causes heritable pulmonary veno-occlusive disease and pulmonary capillary hemangiomatosis. Group 1.3 PAH includes disease that is due to drug or toxin exposures. Methamphetamines, the chemotherapeutic dasatinib and the appetite suppressant and diet drug fenfluramine are associated with PAH. Group 1.4 PAH is disease that is associated with underlying disease.
Sources: en.wikipedia.org
== Uses == Some of the advantages resulting from adopting LOINC may include improved communication in integrated healthcare delivery networks, improved community wide electronic health records, the automatic transfer to public health authorities of case reports for reportable diseases (e.g. for disease control or detection of epidemics), improved transfer of payment information for services rendered and a significant improvement in the overall quality of health care by reducing errors in the system. The fact that universal standards are being promoted (if not adopted by national organizations and agencies) is an indication that the dialogue will continue regarding the development, structure, financing, monitoring, enforcement, and integration of standards within the broader health care system. International interest in LOINC continues to grow. A number of efforts have been undertaken to translate the LOINC documents and terms into various languages, such as Simplified Chinese, German, Spanish. As of January, 2009, the software RELMA (Regenstrief LOINC Mapping Assistant) is available in separate downloads that contain an additional word index in Spanish, Simplified Chinese, or Korean, which allows searching in these languages in addition to English. Harmonization efforts between LOINC and SNOMED CT were initiated in 2012.
TCFH (N,N,N’,N’-tetramethylchloroformamidinium hexafluorophosphate) is an electrophilic amidine reagent used to activate a number of functional groups (such as carboxylic acids) for reaction with nucleophilies. TCFH is most commonly used to activate carboxylic acids for reaction with amines in the context of amide bond formation and peptide synthesis.
== See also == Dambu nama – Spiced shredded meat floss from Northern Nigeria Bakkwa – Salty-sweet dried meat product Čvarci – Southeastern European pork rind Dried shredded squid – Seafood product Katsuobushi – Dried, fermented, and smoked skipjack tuna Machaca – Mexican dried meat Pemmican – Food mix with long shelf life, sometimes used as survival food Pulled pork – Pork barbecue dish of the Southern United States Serundeng – Indonesian spiced grated coconut Food portal
Sources: en.wikipedia.org
GSH is the reduced thiol form, while GSSG is the disulfide-linked oxidized dimer. The GSH:GSSG ratio is used as a redox indicator, though the ratio can vary with sample handling and cell type.
Glutathione is present in many foods, including meats, poultry, fish, some vegetables, and fruits. Cooking, storage, and digestion affect the amounts available for absorption.
Yes, both enzymatic steps in glutathione synthesis consume ATP. The first step, catalyzed by glutamate-cysteine ligase, is usually rate-limiting.
GSH is the reduced, thiol-containing form of glutathione, while GSSG is the oxidized disulfide dimer formed when two GSH molecules react. Cells maintain a high GSH-to-GSSG ratio under normal conditions. A shift toward GSSG is often interpreted as oxidative stress, though sample handling can affect the measured ratio.