The short version of NR1D2 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-10-01. Anything still debated is marked as such rather than presented as settled.
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.
Scientific discussion of SR9009 often separates animal evidence from human anecdote. Rodent studies provide controlled data on endurance, metabolism, and gene expression, but they use specific strains, doses, and treatment durations. Human reports are mostly uncontrolled and cannot establish cause and effect. Open questions include oral bioavailability, tissue distribution, metabolic stability, and long-term effects. Review articles generally call for more rigorous pharmacokinetic and safety research before any clinical use could be considered.
SR9009 is a synthetic small molecule developed as an agonist of the nuclear receptors REV-ERBα (NR1D1) and REV-ERBβ (NR1D2). These receptors help regulate circadian rhythms and metabolic gene expression. In cell and animal studies, SR9009 alters transcription of genes involved in lipid metabolism, inflammation, and mitochondrial function. It is not an approved medicine, and its pharmacological profile in humans remains largely uncharacterized. The compound is frequently discussed in the context of circadian biology and metabolic research rather than clinical use.
Preclinical reports have linked SR9009 to improved endurance and altered energy expenditure in rodents. Such findings have prompted interest in whether REV-ERB activation can influence skeletal muscle metabolism. However, the reported effects depend on dose, route, and experimental model, and replication across laboratories is limited. Human trials have not established comparable outcomes, so claims about exercise performance remain speculative. The absence of controlled human data is a central limitation in interpreting these observations.
The mechanism of action involves binding to REV-ERB receptors and recruiting corepressor complexes, which represses target gene transcription. This contrasts with many nuclear receptor agonists that activate transcription. Downstream effects may include changes in autophagy, mitochondrial biogenesis, and lipid handling, but the precise pathways remain an active area of study. Whether these molecular events translate into meaningful physiological effects in humans is unresolved. Most evidence comes from cultured cells and rodent models rather than human participants.
| 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 |
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.
Regulatory treatment of SR9009 varies by country and context. It is not approved as a therapeutic drug by agencies such as the United States Food and Drug Administration or the European Medicines Agency. Sports authorities list it as a prohibited substance; the World Anti-Doping Agency classifies it among hormone and metabolic modulators. Legal status for personal possession or sale differs across jurisdictions, and some countries may restrict it under analog or research chemical laws. Buyers who seek verified material often rely on independent laboratory testing because online product labels may not match contents.
Laboratory identification of SR9009 typically relies on chromatographic separation coupled to mass spectrometry, often with ultraviolet detection as a secondary check. Nuclear magnetic resonance spectroscopy can confirm molecular structure when a reference standard is available. Because many suppliers sell the compound as a research chemical, independent identity testing is important for experimental reproducibility. A single retention time is not sufficient proof of identity, especially when related compounds may be present. Purity assessments usually report a percentage based on area normalization.
SR9009 is generally described as poorly soluble in water and more soluble in organic solvents such as dimethyl sulfoxide and ethanol. Stock solutions are commonly prepared in an organic solvent before dilution into an aqueous buffer or vehicle. Precipitation can occur if the organic fraction is reduced too quickly or if the final concentration exceeds the compound's solubility limit. Sonication or gentle warming may aid dissolution in some protocols, but excessive heat can promote degradation. Container material and pH can also influence observed solubility.
By 9 November 2011, Houthis were said to be in control of two Yemeni governorates (Saada and Al Jawf) and close to taking over a third governorate (Hajjah), which would enable them to launch a direct assault on the Yemeni capital of Sanaa. In May 2012, it was reported that the Houthis controlled a majority of Saada, Al Jawf, and Hajjah governorates; they had also gained access to the Red Sea and started erecting barricades north of Sanaa in preparation for more conflict.
Platelet disorders (thrombocytopenic purpura) Primary thrombocytopenic purpura Secondary thrombocytopenic purpura Post-transfusion purpura Vascular disorders (nonthrombocytopenic purpura) Microvascular injury, as seen in senile (old age) purpura, when blood vessels are more easily damaged Hypertensive states Deficient vascular support Vasculitis, as in the case of Henoch–Schönlein purpura Coagulation disorders Disseminated intravascular coagulation (DIC) Scurvy (vitamin C deficiency) – defect in collagen synthesis due to lack of hydroxylation of procollagen results in weakened capillary walls and cells Meningococcemia Clumping fibrillary protein deposits caused by Amyloidosis Cocaine use with concomitant use of the one-time chemotherapy drug and now veterinary deworming agent levamisole can cause purpura of the ears, face, trunk, or extremities, sometimes needing reconstructive surgery. Levamisole is purportedly a common cutting agent. Decomposition of blood vessels including purpura is a symptom of acute radiation poisoning in excess of 2 Grays of radiation exposure. This is an uncommon cause in general, but is commonly seen in victims of nuclear disaster. Cases of psychogenic purpura are also described in the medical literature, some claimed to be due to "autoerythrocyte sensitization". Other studies suggest the local (cutaneous) activity of tissue plasminogen activator can be increased in psychogenic purpura, leading to substantial amounts of localized plasmin activity, rapid degradation of fibrin clots, and resultant bleeding.
== List of SERT-selective SRIs == Many SRIs exist, an assortment of which are listed below. Note that only SRIs selective for the SERT over the other monoamine transporters (MATs) are listed below. For a list of SRIs that act at multiple MATs, see other monoamine reuptake inhibitor pages such as SNRI and SNDRI.
Sources: en.wikipedia.org
=== Generation and accumulation === Biomedical waste should be collected in containers that are leak-proof and sufficiently strong to prevent breakage during handling. Containers of biomedical waste are marked with a biohazard symbol. The container, marking, and labels are often red. Discarded sharps are usually collected in specialized boxes, often called needle boxes. Specialized equipment is required to meet OSHA 29 CFR 1910.1450 and EPA 40 CFR 264.173. standards of safety. Minimal recommended equipment include a fume hood and primary and secondary waste containers to capture potential overflow. Even beneath the fume hood, containers containing chemical contaminants should remain closed when not in use. An open funnel placed in the mouth of a waste container has been shown to allow significant evaporation of chemicals into the surrounding atmosphere, which is then inhaled by laboratory personnel, and contributes a primary component to the threat of completing the fire triangle. To protect the health and safety of laboratory staff as well as neighboring civilians and the environment, proper waste management equipment, such as the Burkle funnel in Europe and the ECO Funnel in the U.S., should be utilized in any department which deals with chemical waste. It is to be dumped after treatment. Operating Rooms ORs generate around one-third of waste in a hospital. This waste includes but is not limited to biohazards, plastic materials, pharmaceuticals, and linens. Moreover, ORs require large amounts of energy, causing a further negative environmental impact.
=== Autumn 2007: Deaths across north Texas === The spread of the drug to the outlying suburbs of Dallas was confirmed in September by the return of toxicology reports from the July 13 death of an 18-year-old student from McKinney, located northeast of Dallas in Collin County, and from two July deaths in nearby Tarrant County, one involving a 17-year-old male and the other, a 26-year-old male. Additional suburban deaths in September — in Irving to the west and Rockwall to the east — were believed to be linked to cheese heroin, though police cautioned toxicology reports would not likely be complete until November. The Tarrant County medical examiner's office announced on September 24 that a review of deaths in Tarrant County (west) and Denton County (north) showed an additional 15 deaths between 2004 and 2007 that appeared to be linked to "cheese," and Collin and Rockwall counties had reported one death each. These new figures brought the total number of deaths associated with cheese heroin in northern Texas to 40, a figure that included many older adults along with those age 18 and under.
== Comparable technology == Liquid vaccines generally do not survive freezing, with the notable example of the OPV. Accidental freezing may occur with improper use of ice packs. A freeze indicator can be used to indicate whether something has ever been put under freezing temperatures, with one made by the manufacturer of VVM already prequalified by the WHO. Regular time temperature indicators such as the VVMs do not reflect temperature spikes well. A color-changing peak time temperature indicator (PTTI) can be used in addition to the VVM. The PTTI have a similar form factor but only change color after a set temperature (and does so quickly). A "VVM+" has been released that combines both. An electronic temperature data logger can detect all the above changes along with precise times for when irregularities in temperature have happened. They are more expensive, however.
Sources: en.wikipedia.org
nuclear localization signal (NLS) Also nuclear localization sequence. An amino acid sequence within a protein which serves as a molecular signal marking the protein for transport into the nucleus, typically consisting of one or more short motifs containing positively charged amino acid residues exposed on the mature protein's surface (especially lysines and arginines). Though all proteins are translated in the cytoplasm, many whose primary biological activities occur inside the nucleus (e.g. transcription factors) require nuclear localization signals identifiable by molecular chaperones in order to cross the nuclear envelope. Contrast nuclear export signal.
Romania is divided into 41 counties (județe) and the municipality of Bucharest. Each county is administered by a county council, responsible for local affairs, as well as a prefect responsible for the administration of national affairs at the county level. The prefect is appointed by the central government but cannot be a member of any political party. Each county is subdivided further into cities and communes, which have their own mayor and local council. There are a total of 320 cities and 2,861 communes in Romania. A total of 103 of the larger cities have municipality status, which gives them greater administrative power over local affairs. The municipality of Bucharest is a special case, as it enjoys a status on par to that of a county. It is further divided into six sectors and has a prefect, a general mayor (primar general), and a general city council. The NUTS-3 (Nomenclature of Territorial Units for Statistics) level divisions of the EU reflect Romania's administrative-territorial structure and correspond to the 41 counties plus Bucharest. The cities and communes correspond to the NUTS-5 level divisions, but there are no current NUTS-4 level divisions. The NUTS-1 (four macroregions) and NUTS-2 (eight development regions) divisions exist but have no administrative capacity and are used instead for coordinating regional development projects and statistical purposes.
=== Protein === Additional research on sponge proteins found that of 42 sponge proteins that were analysed, all of them had homologous proteins that are found in humans. An identity score of 53% was given to the similarity among sponge and human proteins, compared to a score of 42% when the same sequence was compared to that of C. elegans.
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.
It is a synthetic compound that acts as an agonist at REV-ERBα and REV-ERBβ. It is used mainly as a research chemical to study circadian and metabolic pathways. It is not approved for human therapeutic use.