A practical reference on NR1D1: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2025-09-19 and is reviewed periodically as new material appears.
Analytical methods for SR9009 typically rely on liquid chromatography coupled with tandem mass spectrometry. The technique can separate the parent compound from related substances and detect low concentrations in biological matrices. Urine and blood are common samples in anti-doping testing, while in vitro studies may use cell culture media. Rapid metabolism and low expected concentrations make method validation important for reliable identification. Exact metabolite patterns can vary by species and are not fully mapped.
Regulatory treatment of SR9009 reflects its investigational status. The compound has no approved human therapeutic indication, and sports authorities prohibit its use. It appears on anti-doping lists as a non-approved substance or metabolic modulator, depending on the list version. Products sold online as research chemicals are not quality-controlled medicines, so their identity and purity can differ from the label. Such products may also contain unlisted compounds, which complicates both testing and safety assessment.
SR9009 is a synthetic small molecule studied as a REV-ERB agonist. REV-ERBα and REV-ERBβ are nuclear receptors that help regulate circadian rhythms and metabolic gene expression. The compound was identified in academic screening efforts to find synthetic ligands for these receptors. In cell and animal studies, SR9009 alters transcription of genes involved in lipid and glucose metabolism, and it can shift circadian behavior. It is not an approved therapeutic agent.
Mechanistically, SR9009 binds the ligand-binding domain of REV-ERBα/β and enhances recruitment of corepressor complexes. This represses target genes rather than activating them. Because REV-ERB proteins normally compete with ROR proteins at shared response elements, the net effect depends on tissue and timing. Researchers use SR9009 to probe how nuclear receptor signaling links the clock to metabolism, inflammation, and muscle biology. Findings are largely preclinical, and the precise contribution of each receptor subtype remains under study.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved for human use | Investigational status in most countries |
| Sports status | Prohibited by WADA | Classified as non-approved or metabolic modulator |
| Common analytical method | LC-MS/MS | Used for trace detection in biological samples |
| Typical test matrices | Urine and blood | Sample choice depends on testing program |
| Human trial data | None published | Effects and safety are not established |
In laboratory settings, SR9009 is typically characterized by liquid chromatography–mass spectrometry (LC-MS) or high-performance liquid chromatography with ultraviolet detection (HPLC-UV). These methods can confirm identity and estimate purity, but they require reference standards for accurate quantification. Because SR9009 is not a licensed pharmaceutical, no harmonized pharmacopeial monograph exists. Laboratories often validate in-house methods for matrices such as plasma, urine, or cell culture media. Sample preparation may involve protein precipitation or liquid-liquid extraction before analysis.
Physicochemical behavior influences handling. SR9009 is described as a solid with limited aqueous solubility, so organic solvents such as dimethyl sulfoxide or ethanol are common in research stock solutions. Aqueous dilution can produce precipitates if the organic content is too low. Light, heat, and repeated freeze-thaw cycles may affect stability. Storage recommendations usually specify a desiccated freezer environment protected from light, but exact stability data depend on the formulation and matrix.
At the molecular level, SR9009 binds the ligand-binding domain of REV-ERB and strengthens recruitment of corepressor proteins such as NCoR and HDAC3. This increases repression of target genes, including Bmal1 and other clock-controlled and metabolic genes. In rodent studies, such changes have been linked to altered lipid handling, glucose metabolism, and energy expenditure. The precise chain of events between receptor binding and whole-body effects remains an active area of research. Findings in animals do not automatically translate to humans.
Laboratory studies often administer SR9009 by injection because oral absorption appears poor in rodents. Reported pharmacokinetic properties include rapid metabolism and low systemic exposure after oral dosing. Human pharmacokinetic data are sparse, so absorption, distribution, metabolism, and excretion in people are not well defined. Some research explores related REV-ERB compounds with improved drug-like properties. Regulatory approval for any REV-ERB agonist as a human medicine has not been granted to date.
No clinical symptoms. Pulp will respond to sensitivity tests as a healthy pulp would. Treatments include root canal or tooth extraction. In endodontic therapy, removal of the inflamed pulp relieves the pain. The empty root canal system is then obturated with gutta-percha (rubber material that acts as a pressure/pain reliever).
May 13–15 – President Trump makes a state visit to China and meets with Chinese leader Xi Jinping. May 13 – The U.S. Senate confirms Kevin Warsh as the Chair of the Federal Reserve in a 54–45 vote. Warsh will succeed Jerome Powell at the end of the latter's term. May 14 Federal employees sue USDA and Secretary Brooke Rollins on First Amendment grounds over proselytizing Christian messaging in work emails. Mike Banks resigns as U.S. Border Patrol Chief, saying he wanted to spend time with family. Bank's resignation came weeks after the Washington Examiner alleged that he engaged in sex tourism in Colombia and Thailand. May 16 – 2026 Long Island Rail Road strike: Five unions representing over 3,500 workers for the Long Island Rail Road, the largest commuter rail system in North America, go on strike to negotiate a new contract with the Metropolitan Transportation Authority in New York City. May 18 – Five people, including two gunmen, are killed in a mass shooting at a mosque in San Diego, California. May 18–19 – The DOJ announces they reached a settlement with the Internal Revenue Service to resolve Trump's $10 billion lawsuit regarding the 2020 leak of his tax returns to The New York Times. Trump drops the lawsuit but will receive a $1.776 billion "anti-weaponization fund" to give to people who were prosecuted by the Biden administration. A day later, the DOJ reveals that the settlement terms include that the IRS is "forever barred and precluded" from investigating past tax returns filed by President Trump, his family and his businesses. May 19 – U.S.
x MeCl + Si → Me3SiCl, Me2SiCl2, MeSiCl3, Me4Si2Cl2, ... Dimethyldichlorosilane (Me2SiCl2) is of particular value as a precursor to silicones, but trimethylsilyl chloride (Me3SiCl) and methyltrichlorosilane (MeSiCl3) are also valuable. Smaller quantities are used as a solvent in the manufacture of butyl rubber and in petroleum refining. Chloromethane is employed as a methylating and chlorinating agent, e.g. the production of methylcellulose. It is also used in a variety of other fields: as an extractant for greases, oils, and resins, as a propellant and blowing agent in polystyrene foam production, as a local anesthetic, as an intermediate in drug manufacturing, as a catalyst carrier in low-temperature polymerization, as a fluid for thermometric and thermostatic equipment, and as a herbicide.
Sources: en.wikipedia.org
Tuberculin, known in its modern form as purified protein derivative (PPD), is a combination of proteins that are used in the diagnosis of tuberculosis by injection into the skin. Common side effects include redness, itchiness (pruritus), and pain at the site of injection. Allergic reactions may occasionally occur. Use is safe in pregnancy. The original tuberculin, a glycerin extract of Mycobacterium tuberculosis, was discovered in 1890 by Robert Koch. Koch, best known for his work on the etiology (cause, origin) of tuberculosis (TB), laid down various rigorous guidelines that aided the establishment between a pathogen and the specific disease that followed that were later named Koch's postulates. Although he initially believed it would cure tuberculosis, this was later disproved. PPD was invented in 1934 by Florence B. Seibert, greatly improving the reliability of the skin test over Koch's extract. PPD is on the World Health Organization's List of Essential Medicines.
CooA is a heme-containing transcription factor that responds to the presence of carbon monoxide. This protein forms homodimers and is a homolog of cAMP receptor protein. The most well-studied CooA homolog comes from Rhodospirillum rubrum (RrCooA), but the homolog from Carboxydothermus hydrogenoformans (ChCooA) has also been characterized. The main structural difference between these homologs lies in ferric heme coordination. In RrCooA, the ferric heme iron is ligated by a cysteine and the amine of the N-terminal proline; in the ferrous state, a ligand switch occurs in which a histidine replaces the thiolate. In contrast, ChCooA features histidine and the N-terminal amine as ligands in both ferric and ferrous states.
39. Izv Akad Nauk Ser Biol. 2001 Sep-Oct;(5):517-21. [Rhythm of protein synthesis in cultures of hepatocytes from rats of different ages. Norm and effect of the peptide livagen]. [Article in Russian] Brodskiĭ VIa, Khavinson VKh, Zolotarev IuA, Nechaeva NV, Malinin VV, Novikova TE, Gvazava IG, Fateeva VI. The circumhoralian rhythm of protein synthesis was determined in a monolayer culture of hepatocytes from rats at the age of 1 to 24 months and weighing from 45 to 480 g, respectively. The peptide lyvagen (Lys-Glu-Asp-Ala) obtained by directed chemical synthesis on the basis of amino acid analysis of the liver polypeptide preparations increased the level of protein synthesis in the hepatocytes from rats of different ages; the highest effect was observed in the cells of old animals. In old rats, lyvagen increased the amplitude of protein synthesis fluctuations. The peptide epitalon (Ala-Glu-Asp-Gly) constructed on the basis of analysis of the epiphysis peptides did not change the intensity of protein synthesis in the cultured hepatocytes.
Sources: en.wikipedia.org
=== SAS === In the SAS method (Supercritical Anti-Solvent), the solid material is dissolved in an organic solvent. The supercritical fluid is then added as an antisolvent, which decreases the solubility of the system. As a result, particles of small diameter are formed. There are various submethods to SAS which differ in the method of introduction of the supercritical fluid into the organic solution.
Type 2 diabetes (T2D), formerly known as adult-onset diabetes, is a form of diabetes mellitus that is characterized by high blood sugar, insulin resistance, and relative lack of insulin. Common symptoms include increased thirst, frequent urination, fatigue and unexplained weight loss. Other symptoms include increased hunger, having a sensation of pins and needles, and sores (wounds) that heal slowly. Symptoms often develop slowly. Long-term complications from high blood sugar include heart disease; stroke; diabetic retinopathy, which can result in blindness; kidney failure; and poor blood flow in the lower limbs, which may lead to amputations. A sudden onset of hyperosmolar hyperglycemic state may occur; however, ketoacidosis is uncommon. Type 2 diabetes primarily occurs as a result of obesity and lack of exercise. Some people are genetically more at risk than others. Type 2 diabetes makes up about 90% of cases of diabetes, with the other 10% due primarily to type 1 diabetes and gestational diabetes. Diagnosis of diabetes is by blood tests such as fasting plasma glucose, oral glucose tolerance test, or glycated hemoglobin (A1c). Type 2 diabetes is often preventable by staying at a normal weight, exercising regularly, and eating a healthy diet (a popular example is a diet high in fruits and vegetables and low in sugar and saturated fat). Treatment may involve exercise, dietary changes, and medication. Metformin is often recommended. Many people may eventually also require insulin injections.
===== Oxygen isotope anomaly ===== The comparison of coral strontium/calcium minimums with sea surface temperature maximums, data recorded from NINO 3.4 SSTA, time can be correlated to coral strontium/calcium and δ18O variations. To confirm the accuracy of the annual relationship between Sr/Ca and δ18O variations, a perceptible association to annual coral growth rings confirms the age conversion. Geochronology is established by the blending of Sr/Ca data, growth rings, and stable isotope data. El Nino-Southern Oscillation (ENSO) is directly related to climate fluctuations that influence coral δ18O ratio from local salinity variations associated with the position of the South Pacific convergence zone (SPCZ) and can be used for ENSO modeling.
=== Sarcomere assembly === In addition to sarcomere activity, it has been shown that myomesin also plays a role in the assembly of the sarcomere. In order for myomesin to be implemented into the sarcomere, myosin and titin must be present, indicating that myomesin is the last component to be added during assembly of the lattice. It is believed that this postponed addition is due to the role of myomesin to act as an "integrity check" to ensure the sarcomere has been formed correctly and monitor its integrity. This is extremely important as if even one piece of the M-line is missing, the A-band of the sarcomere will collapse and the muscle will be paralyzed.
Sources: en.wikipedia.org
No. It is an investigational compound without approved therapeutic indications. It is sold for research purposes only in many jurisdictions.
Sports authorities prohibit it because it is not approved for human use and has potential performance-enhancing effects. It appears on anti-doping lists under non-approved or metabolic modulator categories.
Detection usually uses liquid chromatography-tandem mass spectrometry. The method targets the parent compound or its metabolites in urine or blood.
SR9009 is a synthetic compound investigated as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. It is used in preclinical research on circadian rhythm and metabolism. It is not an approved drug.