A practical reference on thiol: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-10-22 and is reviewed periodically as new material appears.
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.
Glutathione participates in detoxification reactions, amino acid transport, and the maintenance of protein thiols. It serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. In research literature, altered glutathione status appears in studies of aging, infection, metabolic stress, and environmental exposure. Whether low glutathione is a cause, consequence, or marker of such conditions often remains unresolved. Direct measurement in blood or tissue provides a snapshot, but results depend on sample handling, timing, and the method used.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C10H17N3O6S | Reduced glutathione (GSH); oxidized form differs by disulfide linkage. |
| Molar mass | 307.32 g/mol | Calculated for the reduced tripeptide. |
| Appearance | White to off-white crystalline powder | Typical laboratory reagent description. |
| Solubility | Soluble in water | Aqueous solutions are acidic; solubility depends on pH and salt form. |
| CAS Registry Number | 70-18-8 | Refers to reduced L-glutathione; oxidized form has a different number. |
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.
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 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 supports several cellular processes beyond direct antioxidant action. It serves as a cofactor for glutathione peroxidase and glutathione S-transferase enzymes, which reduce peroxides and conjugate electrophiles, respectively. The molecule also acts as a reservoir of cysteine, an amino acid that can limit protein synthesis and redox signaling. In human nutrition, oral glutathione is sold as a supplement, but how much intact glutathione reaches tissues after ingestion remains an active research question. Clinical claims about supplementation are not uniformly supported by controlled trials.
Glutathione is a small tripeptide built from glutamic acid, cysteine, and glycine. Its peptide bond between glutamate and cysteine involves the gamma-carboxyl group rather than the usual alpha-carboxyl group. This structure gives the molecule a reactive thiol on the cysteine residue. The reduced form, often abbreviated GSH, is the predominant intracellular species in many cell types. Because the thiol can donate electrons, glutathione participates in redox chemistry and in the conjugation of reactive molecules.
Cells synthesize glutathione through two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine, and glutathione synthetase adds glycine to form the complete tripeptide. Breakdown occurs through gamma-glutamyl transpeptidase and subsequent peptidase reactions, forming the gamma-glutamyl cycle. Within cells, glutathione also forms a disulfide-linked dimer called GSSG when two GSH molecules react. The balance between GSH and GSSG is widely used as an indicator of oxidative conditions, although the ratio can vary by compartment and tissue.
== Reactions == Meirav Ben-Ari, an Israeli Knesset member, stated, "The children in Gaza brought it upon themselves." Far-right Israeli Nation Security Minister Itamar Ben-Gvir called for the death of any child or woman who got too close to the border during a debate with Israeli military chief Herzi Halevi, claiming that "We cannot have women and children getting close to the border... anyone who gets near must get a bullet [in the head],". Ben-Gvir claimed that the open-fire policy he was advocating for was based on the perceived use of women and children by Hamas to target Israel. During an interview on Israeli television, a former Mossad official Rami Igra who had headed the agencies "Captive and Missing Division", claimed that there were no uninvolved civilians in Gaza. He raised claims that "anyone over four is a Hamas supporter" and that only those under four could be considered children, while anyone above that age could starve. Rabbi Eliyahu Mali, the head of a yeshiva in Jaffa, stated that the ongoing war was a mitzvah war and that not a soul shall live in Gaza as they will all grow up to become Hamas. When asked about babies and children in context with his comments, he stated; "Babies too?...The same thing. You can't be clever with the Torah. Today he's a baby, tomorrow he's a fighter. There are no questions here. Today's terrorists were 8-year-old children in the previous operation. So you can't To be satisfied here.
Cebaracetam (INNTooltip International Nonproprietary Name; developmental code names CGS-25248; ZY-15119) is an experimental drug of the racetam group described as a nootropic which was never marketed. It is a chlorinated acetylpiperazine-substituted analogue of phenylpiracetam and is also a derivative of RGPU-95 (4-chlorophenylpiracetam). It is the analogue of RGPU-95 in which the terminal amide group has been replaced with a piperazin-2-one moiety. The mechanism of action of cebaracetam is undefined or unknown. The drug was under development by Novartis for the treatment of cognition disorders by the 1990s but development was discontinued in 1995. It reached phase 2 clinical trials prior to its discontinuation.
== Medical uses == Zalcitabine was the third antiretroviral to be approved by the Food and Drug Administration (FDA) for the treatment of HIV/AIDS. It was approved on June 19, 1992, as a monotherapy and again in 1996 for use in combination with zidovudine (AZT). Using combinations of NRTIs was in practice prior to the second FDA approval and the triple drug combinations with dual NRTIs and a protease inhibitor (PI) were not far off by this time. In 1992 dideoxycytidine was listed as a specialty drug. The sale and distribution of zalcitabine has been discontinued since December 31, 2006.
Uranium, like all elements with an atomic number greater than 82, has no stable isotopes. All isotopes of uranium are radioactive because the strong nuclear force does not prevail over electromagnetic repulsion in nuclides containing more than 82 protons. Nevertheless, the two most stable isotopes, 238U and 235U, have half-lives long enough to occur in nature as primordial radionuclides, with measurable quantities having survived since the formation of the Earth. These two nuclides, along with thorium-232, are the only confirmed primordial nuclides heavier than nearly-stable bismuth-209. Natural uranium consists of three major isotopes: uranium-238 (99.28% natural abundance), uranium-235 (0.71%), and uranium-234 (0.0054%). There are also five other trace isotopes: uranium-240, a decay product of plutonium-244; uranium-239, which is formed when 238U undergoes spontaneous fission, releasing neutrons that are captured by another 238U atom; uranium-237, which is formed when 238U captures a neutron but emits two more, which then decays to neptunium-237; uranium-236, which occurs in trace quantities due to neutron capture on 235U and as a decay product of plutonium-244; and finally, uranium-233, which is formed in the decay chain of neptunium-237. Additionally, uranium-232 would be produced by the double beta decay of natural thorium-232, though this energetically possible process has never been observed. Uranium-238 is the most stable isotope of uranium, with a half-life of about 4.463×109 years, roughly the age of the Earth.
Sources: en.wikipedia.org
=== Michael: All American D-Bag === Michael, who calls himself an all-American badass, picked on William because of his culture and hobbies. It is unknown why this episode has never aired in America. However, it has aired on the Fox8 channel of Foxtel and Austar in Australia. It has never been leaked on the internet, and is not available on the Bully Beatdown website. A preview can be seen at the end of Andy's episode. Michael tapped out five times in the first round and was knocked out with a stomach blow in the second. William won $10,000 and an apology from his bully.
Three more recent reviews reached similar conclusions: little evidence supporting the use of trigger point dry needling to treat upper shoulder pain and dysfunction, evidence not robust enough to draw a clear conclusion about safety and efficacy, and that dry needling for the treatment of myofascial pain syndrome in the lower back appeared to be a useful addition to standard therapies, but stated clear recommendations could not be made because the published studies were small and of low quality. However, a retrospective analysis of 2,910 dry needling interventions as reported by Mabry, et al. identified no reported safety events when dry needling was performed by physical therapists.
However, the evidence is poor quality relating to the treatment of uveitis, with the potential side effects (cataract progression and raised intraocular pressure) being significant, and the benefits not certainly greater than standard treatment. Dexamethasone has also been used with antibiotics to treat acute endophthalmitis. Dexamethasone is used in transvenous screw-in cardiac pacing leads to minimize the inflammatory response of the myocardium. The steroid is released into the myocardium as soon as the screw is extended and can play a significant role in minimizing the acute pacing threshold due to the reduction of inflammatory response. The typical quantity present in a lead tip is less than 1.0 mg. Dexamethasone may be administered before antibiotics in cases of bacterial meningitis. Gram-negative bacteria — to which the causative agent of bacterial meningitis, Neisseria meningitidis, belongs — have highly immunogenic lipopolysaccharides as a component of their cell membrane and trigger a strong inflammatory response. Pre-administration of dexamethasone before the administration of antibiotics acts to reduce that response, thus reducing hearing loss and neurological damage.
Blumofe (1930), producer of Bound for Glory, nominated for the Academy Award for Best Picture Ben Maddow (1930), screenwriter for The Asphalt Jungle, God's Little Acre and The Mephisto Waltz Albert Maltz (1930), screenwriter for Destination Tokyo and one of the Hollywood Ten Arnold M. Auerbach (1932), Primetime Emmy Award-winning American comedy writer William Ludwig (1932), Academy Award-winning screenwriter, Interrupted Melody Martin Manulis (1935), CBS television and movie producer, Days of Wine and Roses, The Best of Broadway, Climax!, Suspense; creator of Playhouse 90; former president of 20th Century Fox Television Charles H. Schneer (1940), film producer known for his collaboration with Ray Harryhausen I.A.L. Diamond (1941), screenwriting partner of Billy Wilder; co-author of Some Like It Hot; co-winner of the Academy Award for Best Original Screenplay for The Apartment Don M.
=== Reopening Chicago Public Schools === While SHIELD Illinois provided free SARS-CoV-2 testing to most school districts throughout Illinois and submitted a proposal to test Chicago Public Schools ("CPS"), CPS ultimately chose Massachusetts-based Thermo Fisher Scientific as its testing vendor. Despite this, when logistical issues related to the Omicron surge led to test result delays, 25,000 specimens rejected as invalid, and a vote by the Chicago Teachers Union ("CTU") to postpone the start of school in January 2022, SHIELD Illinois provided CPS with SHIELD's entire stockpile of over 300,000 rapid antigen tests. This allowed CPS to achieve testing levels at which CTU felt comfortable returning to the classroom and get the 340,000 students in CPS back into the classroom.
Sources: en.wikipedia.org
Brain natriuretic peptide (BNP), also known as B-type natriuretic peptide, is a peptide hormone secreted by cardiomyocytes in the heart ventricles in response to stretching caused by increased ventricular blood volume. BNP is one of the three natriuretic peptides, in addition to atrial natriuretic peptide (ANP) and C-type natriuretic peptide (CNP). BNP was first discovered in porcine brain tissue in 1988, which led to its initial naming as "brain natriuretic peptide", although subsequent research revealed that BNP is primarily produced and secreted by the ventricular myocardium (heart muscle) in response to increased ventricular blood volume and stretching. To reflect its true source, BNP is now often referred to as "B-type natriuretic peptide" while retaining the same acronym. The 32-amino acid polypeptide BNP-32 is secreted attached to a 76–amino acid N-terminal fragment in the prohormone called NT-proBNP (BNPT), which is biologically inactive. Once released, BNP binds to and activates the atrial natriuretic factor receptor NPRA, and to a lesser extent NPRB, in a fashion similar to atrial natriuretic peptide (ANP) but with 10-fold lower affinity. The biological half-life of BNP, however, is twice as long as that of ANP, and that of NT-proBNP is even longer, making these peptides better targets than ANP for diagnostic blood testing. The physiologic actions of BNP are similar to those of ANP and include decrease in systemic vascular resistance and central venous pressure as well as an increase in natriuresis.
== History of nanofiber production == Nanofibers were first produced via electrospinning more than four centuries ago. Beginning with the development of the electrospinning method, English physicist William Gilbert (1544-1603) first documented the electrostatic attraction between liquids by preparing an experiment in which he observed a spherical water drop on a dry surface warp into a cone shape when it was held below an electrically charged amber. This deformation later came to be known as the Taylor cone. In 1882, English physicist Lord Rayleigh (1842-1919) analyzed the unstable states of liquid droplets that were electrically charged, and noted that the liquid was ejected in tiny jets when equilibrium was established between the surface tension and electrostatic force. In 1887, British physicist Charles Vernon Boys (1855-1944) published a manuscript about nanofiber development and production. In 1900, American inventor John Francis Cooley (1861-1903) filed the first modern electrospinning patent. Anton Formhals was the first person to attempt nanofiber production between 1934 and 1944 and publish the first patent describing the experimental production of nanofibers. In 1966, Harold Simons published a patent for a device that could produce thin and light nanofiber fabrics with diverse motifs. Only at the end of the 20th century have the words electrospinning and nanofiber become common language among scientists and researchers. Electrospinning continues to be developed today.
== Causes == Mutations in the COL11A1, COL11A2, and COL2A1 genes cause collagenopathy, types II and XI. These genes carry instructions for the protein strands that make up type II and type XI collagen. All collagen molecules are made of three protein strands (called alpha chains). The alpha chains may be identical or different, depending on the type of collagen. Type II collagen is made by combining three copies of the alpha chain made by the COL2A1 gene. Type XI collagen, on the other hand, is composed of three different alpha chains: the products of the COL2A1, COL11A1, and COL11A2 genes. Mutations in these genes interfere with the proper assembly of type II and XI collagens or reduce the amount of these collagens. Defective or reduced numbers of collagen molecules affect the development of bones and other connective tissues, causing the signs and symptoms of the type II and XI collagenopathies.
== Pharmacology == Lisinopril is the lysine-analog of enalaprilat, the active metabolite of enalapril. Unlike other ACE inhibitors, it is not a prodrug, is not metabolized by the liver, and is excreted unchanged in the urine.
==== Other members ==== Octian Porupo (オクト星人ポルポ, Okuto Seijin Porupo): An octopus-themed member of S.P.D., and Ban's former instructor from Planet Octo, who feels his student should be removed from S.P.D. due to his recklessness. Porupo is voiced by Issei Futamata (二又 一成, Futamata Issei). Horusian Numa-O (ホルス星人ヌマ・O, Numa Ō): The professional avian supreme commander of S.P.D. from Planet Horus. Numa-O is voiced by Kazuhiko Kishino (岸野 一彦, Kishino Kazuhiko). Tortorian Buntar (トート星人ブンター, Tōto Seijin Buntā): An ape-themed member of S.P.D., and old friend of Kruger's, from Planet Torto, who owns a mechanical dog named Clarence K-9 (クラレンスK9, Kurarensu Kē Nain) and trains the Dekarangers to assume their S.W.A.T. Modes. Buntar is voiced by Naoki Kusumi (楠見 尚己, Kusumi Naoki). Lumierian Lisa Teagle (リュミエル星人リサ・ティーゲル, Ryumieru Seijin Risa Tīgeru): The chief of the Tokkyou Division's first squad from Planet Lumiere, and Tetsu's mentor, who believes that the perfect officer must be passionless to be efficient. Additionally, using her own Bracerottle, she can transform into the silver-colored Deka Bright (デカブライト, Deka Buraito). After coming to Earth, she initially intended to take Tetsu back for straying from her teachings, but decides against that after seeing him fight, realizing that passion can be a positive trait for an officer. Lisa Teagle is portrayed by Mie Nanamori (七森 美江, Nanamori Mie).
Sources: en.wikipedia.org
GSH is the reduced form of glutathione, with a free thiol group on cysteine. GSSG is the oxidized disulfide form, created when two GSH molecules become linked. The two forms exist together, and their balance is often reported as the GSH/GSSG ratio in laboratory studies.
Glutathione is synthesized inside cells from amino acids rather than being classified as an essential dietary nutrient. Dietary sources can provide glutathione or its precursors, but digestion and absorption alter what reaches tissues. Research continues on how dietary intake relates to cellular glutathione levels.
The liver has high glutathione concentrations and uses the compound in conjugation and antioxidant reactions. These reactions are relevant to the processing of drugs, pollutants, and normal metabolic byproducts. Studies often examine liver glutathione as a marker of oxidative stress or detoxification capacity.
It is a tripeptide of glutamate, cysteine, and glycine. The glutamate-cysteine bond is unusual because it forms through the gamma-carboxyl group.