SR9009 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
SR9009 is not approved as a medicine by major regulatory agencies. It is commonly sold as a research chemical, a category that may fall outside customary drug approval and quality rules. In sports, the World Anti-Doping Agency lists SR9009 as a prohibited substance. Athletes who use it can face sanctions if it is detected in a sample. Legal status varies by country, and importation may be restricted. Enforcement practices differ across borders.
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
SR9009 is a synthetic small molecule developed as a REV-ERB agonist. It binds to REV-ERBα and REV-ERBβ, nuclear receptors that help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, the compound alters lipid and glucose handling and influences skeletal muscle oxidative capacity. Its exact effects in humans remain largely uncharacterized because controlled clinical trials have not been reported. The molecule is frequently described in preclinical literature as a metabolic modulator.
Research interest in SR9009 grew from studies showing improved running endurance in mice after short treatment periods. Those experiments linked the compound to increased mitochondrial content and fatty acid oxidation in muscle, but the findings come from animal models and specific dosing schedules. Independent replication has been limited, and the pathways connecting REV-ERB activation to exercise performance are still being mapped. Whether similar responses occur in humans is an open question.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved as a medicine in major jurisdictions | Sold as a research chemical; legal status varies |
| Anti-doping status | Prohibited by the World Anti-Doping Agency | Listed under non-approved substances or related category |
| Typical analytical method | LC-MS/MS | Used for detection and confirmation in biological samples |
| Storage temperature | −20 °C or lower for solid | Desiccated and protected from light |
| Common solution solvents | DMSO; ethanol | Aqueous solubility is limited |
SR9009 is a synthetic small molecule studied as an agonist of REV-ERB nuclear receptors. REV-ERB alpha and REV-ERB beta help regulate circadian rhythms and metabolic gene expression. In laboratory research, SR9009 has been used to probe how these receptors affect skeletal muscle, liver, and adipose tissue. The compound was identified in academic drug-discovery work and is often described in scientific literature by its chemical name and research code. It is not an approved medicine, and human clinical data remain limited or absent.
SR9009 binds REV-ERB receptors and alters their repressive activity on target genes. This action can change transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. In rodent studies, treated animals have shown changes in muscle oxidative capacity and exercise performance, though effects vary by dose, duration, and model. The precise molecular steps connecting receptor binding to whole-body outcomes are still an active area of investigation. Findings in animals do not automatically translate to humans.
=== Environmental impact === Refinement of sulfidic zinc ores produces large volumes of sulfur dioxide and cadmium vapor. Smelter slag and other residues contain significant quantities of metals. About 1.1 million tonnes of metallic zinc and 130 thousand tonnes of lead were mined and smelted in the Belgian towns of La Calamine and Plombières between 1806 and 1882. The dumps of the past mining operations leach zinc and cadmium, and the sediments of the Geul River contain non-trivial amounts of metals. About two thousand years ago, emissions of zinc from mining and smelting totaled 10 thousand tonnes a year. After increasing 10-fold from 1850, zinc emissions peaked at 3.4 million tonnes per year in the 1980s and declined to 2.7 million tonnes in the 1990s, although a 2005 study of the Arctic troposphere found that the concentrations there did not reflect the decline. Man-made and natural emissions occur at a ratio of 20 to 1. Zinc in rivers flowing through industrial and mining areas can be as high as 20 ppm. Effective sewage treatment greatly reduces this; treatment along the Rhine, for example, has decreased zinc levels to 50 ppb. Concentrations of zinc as low as 2 ppm adversely affects the amount of oxygen that fish can carry in their blood.
The event that precipitated the Cold War in continental Asia was the resumption of the Chinese Civil War (1927–1949) fought between the anti-communist Kuomintang and the Chinese Communist Party. After military defeat exiled Generalissimo Chiang Kai-shek and his Kuomintang nationalist government to Formosa island (Taiwan), Mao Zedong established the People's Republic of China on 1 October 1949.
=== Chemical glycosylation of the IgG Fc fragment === Nature has perfected glycosylation of proteins through a complex interaction of enzymes and carbohydrates over thousands of years. However, chemical glycosylation is still an obstacle due to the difficult synthesis of glycan in general. The synthesis of carbohydrate derivatives can be slow and tedious. Nonetheless, the interest in technologies to structurally mimic protein glycosylation is an appealing application as some protein functions solely depend on the pattern of the attached glycan. The Fc fragment of the IgG antibody, for example, is a homodimer with a highly conserved N-glycosylation site. The attached sugar moieties modulate the binding to specific immunoreceptors, thereby modifying the whole antibody function. Smith et al. demonstrate the application of the aldehyde tag as a chemical conjugation site for glycans. The aldehyde tag sequence was incooperated into the Fc construct and introduced into CHO (Chinese hamster ovary) cells. As controls, gene constructs were used in which the cysteine residue was mutated to an alanine. After expression, the Fc proteins were purified using a protein A/G agarose column. The conversion in CHO cells of cystein to formylglycine was examined using aminooxy AlexaFluor 488 and subsequent SDS-PAGE. However, fluorescence scanning displayed no fluorescence labeling, i.e. no formylglycine formation by endogenous FGE in CHO cells.
Sources: en.wikipedia.org
In 2019, the non-profit labor justice organization Fair World Project released an article outling how despite Starbucks had passed coffee producers as slave free in their Brazil production units using their internal C.A.F.E. certification standards, that Brazilian labor inspectors had proof of child slave labor practices being present in their supply chain. In 2022 Starbucks announced that they were going to stop certifying their coffee beans as fairtrade, in favor of their own in-house investigations.
== Active site structure == The multicopper active site of CP contains a type I (T1) mononuclear copper site and a trinuclear copper center distant by ca.12-13 Å. The tricopper center consists of two type III (T3) coppers and one type II (T2) copper ion. The two T3 copper ions are bridged by a hydroxide ligand while another hydroxide ligand links the T2 copper ion to the protein. The T1 center is bridged to the tricopper center by two histidine (His1020, His1022) residues and one Cys(1021) residue. The substrate binds near the T1 center and is oxidized by the T1 Cu2+ ion forming the reduced Cu+ oxidation state. The reduced T1 Cu+ then transfers the electron through the one Cys and two His bridging residues to the tricopper center. After four electrons have been transferred from the substrates to the copper centers, an O2 binds at the tricopper center and undergoes a four-electron reduction to form two molecules of water.
This reasoning was conditioned by Russia's historical experiences, given the frequency with which the country had been invaded over the preceding 150 years. The Second World War experience was particularly dramatic for the Russians: the Soviet Union suffered unprecedented devastation as a result of the Nazi onslaught, and over 20 million Soviet citizens died during the war; tens of thousands of Soviet cities, towns, and villages were leveled; and 30,100 Soviet factories were destroyed. In order to prevent a similar assault in the future, Stalin was determined to use the Red Army to gain control of Poland, to dominate the Balkans and to destroy utterly Germany's capacity to engage in another war. The problem was that Stalin's strategy risked confrontation with the equally powerful United States, who viewed Stalin's actions as a flagrant violation of the Yalta agreement. At the end of the war in Europe, in May 1945, the Soviets insisted on occupying the Danish island of Bornholm, due to its strategic position at the entrance to the Baltic. When the local German commander insisted on surrendering to the Western Allies, as did German forces in the rest of Denmark, the Soviets bombed the island, causing heavy casualties and damage among a civilian population which was only lightly touched throughout the war, and then invaded the island and occupied it until mid-1946—all of which can be considered as initial moves in the Cold War.
Sources: en.wikipedia.org
While uterine prolapse is rarely life-threatening, the symptoms associated with uterine prolapse can have a significant impact on quality of life. The severity of prolapse symptoms does not necessarily correlate with the degree of prolapse, and one may experience little to no bothersome symptoms with even advanced prolapse. Additionally, different forms of pelvic organ prolapse often present with similar symptoms. Most women who experience pelvic organ prolapse do not have symptoms. When symptoms are present, the most common and most specific symptoms for uterine prolapse—and organ prolapse in general—into the vagina are bulge symptoms, such as pelvic pressure, vaginal fullness, or a palpable vaginal bulge, and these symptoms are often more common and more severe if the prolapse reaches the vaginal hymen. Urinary symptoms, such as uncontrollable loss of urine or difficulty urinating, may also be present. Complete uterine prolapse in which the uterus protrudes through the vaginal hymen is known as procidentia. In the absence of treatment, symptoms of procidentia may include purulent vaginal discharge, ulceration, and bleeding. Complications of procidentia include urinary obstruction. People may also report sexual dysfunction symptoms, such as pain with sexual intercourse and decreased libido. There is conflicting data concerning the effect of pelvic organ prolapse on sexual function. The severity of the symptoms associated with prolapse seems to have a negative effect on sexual activity and reported satisfaction.
Lemna is a genus of free-floating aquatic plants referred to by the common name "duckweed". They are morphologically divergent members of the arum family Araceae. These rapidly growing plants have found uses as a model system for studies in community ecology, basic plant biology, ecotoxicology, and production of biopharmaceuticals, and as a source of animal feeds for agriculture and aquaculture. Currently, 14 species of Lemna are recognised.
Insulin-like growth factor 2 receptor (IGF2R), also called the cation-independent mannose-6-phosphate receptor (CI-MPR) is a protein that in humans is encoded by the IGF2R gene. IGF2R is a multifunctional protein receptor that binds insulin-like growth factor 2 (IGF2) at the cell surface and mannose-6-phosphate (M6P)-tagged proteins in the trans-Golgi network.
Sources: en.wikipedia.org
Its legal status depends on the country and intended use. It is not an approved medicine in major jurisdictions. In sport, it is prohibited by anti-doping rules.
Laboratories typically use LC-MS/MS to detect SR9009 and related compounds in urine or blood. The method is sensitive but depends on sample collection timing. Confirmatory analysis follows quality-control procedures.
Solid material is generally kept cold, dry, and protected from light. Solutions are often stored in sealed containers at low temperature. Stability beyond recommended periods is not well documented.
It is a synthetic REV-ERB agonist used mainly in preclinical research. It is not an approved medicine for human use.