NR1D1 is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Laboratory samples of SR9009 are typically handled as research chemicals rather than pharmaceuticals. Suppliers usually state that the material is for research use only and not for human or veterinary administration. Storage recommendations generally call for a freezer at approximately −20 °C, protection from light, and a desiccated environment. The solid is often described as a white to off-white powder. Solubility is commonly reported in organic solvents such as dimethyl sulfoxide and ethanol, with low solubility in water.
Analytical identification and purity assessment often use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Liquid chromatography–tandem mass spectrometry is used to detect and quantify SR9009 in biological matrices, including urine and blood, for anti-doping or pharmacokinetic studies. Nuclear magnetic resonance spectroscopy can confirm molecular structure. Stability depends on form and storage: the solid is generally more stable than solutions, and repeated freeze–thaw cycles may degrade samples. Purity is typically reported as a percentage from a certificate of analysis.
| 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 |
At the molecular level, SR9009 binds REV-ERBα and REV-ERBβ and alters their repressive activity on target genes. These nuclear receptors help regulate the circadian clock, lipid synthesis, glucose metabolism, and inflammatory pathways. By changing transcription, the compound can shift the timing or magnitude of downstream metabolic processes in model systems. It does not act through androgen receptors or adenosine receptors, which distinguishes it from several substances sold for athletic performance. Whether the same transcriptional changes occur in humans at tolerable exposures remains an open question because controlled human studies are lacking.
Preclinical reports describe effects on exercise endurance, mitochondrial content, and lipid profiles in rodents, but these findings come from specific experimental conditions. Many studies use high doses or delivery methods that may not translate directly to human use. SR9009 has been reported to have low oral bioavailability and a short half-life, which complicates interpretation of oral dosing studies. It is not established as safe or effective for any indication. Literature discussions often separate its pharmacological mechanism from unverified claims made in fitness and supplement markets.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ, also called NR1D1 and NR1D2. These receptors help regulate circadian rhythms and metabolic gene programs. The compound was developed for laboratory research, not as an approved therapeutic. Its identity is distinct from steroid hormones and selective androgen receptor modulators. Scientific interest centers on how REV-ERB activation changes gene expression in cells and animal models.
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.
=== Communes of the former Seine department === The destruction caused by the Commune affected not only the originals stored at the annex of the Hôtel de Ville, located at 4 Avenue Victoria, but also the duplicates from the Greffe collection, which were destroyed in the fire at the Palais de Justice on May 24, 1871. The disaster obliterated most of the parish registers (pre-1793) and civil status records (1793–1859) from the communes of the former Seine department. The situation varies depending on how these areas were incorporated into Paris in 1860:
Rinck PA (ed.). "MRI: A Peer-Reviewed, Critical Introduction". European Magnetic Resonance Forum (EMRF)/The Round Table Foundation (TRTF). A Guided Tour of MRI: An introduction for laypeople National High Magnetic Field Laboratory The Basics of MRI. Underlying physics and technical aspects. Video: What to Expect During Your MRI Exam from the Institute for Magnetic Resonance Safety, Education, and Research (IMRSER) Royal Institution Lecture – MRI: A Window on the Human Body A Short History of Magnetic Resonance Imaging from a European Point of View How MRI works explained simply using diagrams Real-time MRI videos: Biomedizinische NMR Forschungs GmbH. Paul C. Lauterbur, Genesis of the MRI (Magnetic Resonance Imaging) notebook, September 1971 (all pages freely available for download in variety of formats from Science History Institute Digital Collections at digital.sciencehistory.org) Images showing early MRI scans and the development of the MRI scanner from the archives of University of Nottingham Manuscripts and Spcial Collections Archive collections relating to the development of MRI at the University of Nottingham, including the papers of Nobel Prize winner Sir Peter Mansfield
The Constitution of the short-lived Zimbabwe Rhodesia, which saw a black-led government elected for the first time, reserved 28 of the 100 parliamentary seats for whites. The independence constitution agreed at Lancaster House watered those provisions down and reserved 20 out of 100 seats for whites in the House of Assembly and 8 out of 40 seats in the Senate. The constitution prohibited Zimbabwe authorities from altering the Constitution for seven years without unanimous consent and required a three-quarters vote in Parliament for a further three years. The government amended the Constitution in 1987 to abolish the seats reserved for whites, and replace the office of prime minister with an executive president. In 1990, the government abolished the Senate.
Sources: en.wikipedia.org
== Definition == Conventionally, merocyanine class includes streptocyanines and their analogues where both the nitrogen atom and carbonyl group (or any other electron-withdrawing group containing a multiple carbon-heteroatomic bond, e.g. amino group) can form part of a heterocyclic system. Like ionic cyanines, merocyanines contain two terminal heteroatoms and a polymethine chain in their chromophores.
=== Detection in body fluids === Buprenorphine and norbuprenorphine may be quantified in blood or urine to monitor use or non-medical recreational use, confirm a diagnosis of poisoning, or assist in a medicolegal investigation. A significant overlap of drug concentrations exists in body fluids within the possible spectrum of physiological reactions ranging from asymptomatic to comatose. Therefore, knowing both the route of administration of the drug and the level of tolerance to opioids of the individual is critical when results are interpreted.
=== Synthesis === The sizeable number of serotonergic drugs for treating migraines all incorporate the indole nucleus found in serotonin itself. It is thus of interest that a compound based on a benzopyran manifests much the same activity.
At least one organization, the Australasian Paediatric Endocrine Group, classifies the cancer risk associated with CAIS as low enough to recommend against gonadectomy, although it warns that the cancer risk is still elevated above the general population, and that ongoing cancer monitoring is essential. Some choose to perform gonadectomy if and when inguinal hernia presents. Estrogen replacement therapy is critical to minimize bone mineral density deficiencies later in life.
Sources: en.wikipedia.org
SCID mice were and still are used in disease, vaccine, and transplant research, especially as animal models for testing the safety of new vaccines or therapeutic agents in people with weakened immune system. SCID mice also serve as a useful animal model in the study of the human immune system and its interactions with disease, infections, and cancer. For example, normal strains of mice can be lethally irradiated, killing all rapidly dividing cells. These mice then receive bone marrow transplantation from SCID donors, allowing engraftment of human peripheral blood mononuclear cells (PBMC) to occur. This method can be used to study whether T cell-lacking mice can perform hematopoiesis after receiving human PBMC. A recessive gene, with clinical signs similar to the human condition, affects the Arabian horse. The condition remains a fatal disease, as the horse inevitably succumbs to an opportunistic infection within the first four to six months of life. However, carriers, who themselves are not affected by the disease, can be detected with a DNA test. Therefore, careful breeding practices can avoid the risk of an affected foal being produced. Another animal with well-characterized SCID pathology is the dog. There are two known forms: an X-linked SCID in Basset Hounds that has similar ontology to X-SCID in humans and an autosomal recessive form seen in one line of Jack Russell Terriers that is similar to SCID in Arabian horses and mice.
=== Cancer === Because MTs play an important role in transcription factor regulation, defects in MT function or expression may lead to malignant transformation of cells and ultimately cancer. Studies have found increased expression of MTs in some cancers of the breast, colon, kidney, liver, skin (melanoma), lung, nasopharynx, ovary, prostate, mouth, salivary gland, testes, thyroid and urinary bladder; they have also found lower levels of MT expression in hepatocellular carcinoma and liver adenocarcinoma. Evidence suggests that greater MT expression may cause resistance to chemotherapy.
Economically, Southern Rhodesia developed an economy that was narrowly based on the production of a few primary products, notably, chromium and tobacco. It was therefore vulnerable to the economic cycle. The deep recession of the 1930s gave way to a post-war boom. This boom prompted the immigration of about 200,000 whites between 1945 and 1970, taking the white population up to 307,000. A large number of these immigrants were of British working-class origin, with others coming from the Belgian Congo, Kenya, Tanzania, and later Angola and Mozambique. They established a relatively balanced economy, transforming what was once a primary producer dependent on backwoods farming into an modest industrial power which spawned a strong manufacturing sector, iron and steel industries, and modern mining ventures. These economic successes owed a lot to the immigration of skilled labour and backing from South Africa. The economy of the state of Rhodesia sustained international sanctions for a decade following the declaration of its independence, a resistance which waned as more southern African states declared independence and majority rule as well as the destruction caused by the Rhodesian Bush War.
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.
Legality depends on the country and the intended use. In many places it is sold as a research chemical, but sports and medicine regulations restrict it.