The short version of nuclear receptor fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-06-28 and is reviewed periodically as new material appears.
Quality control for research materials includes identity confirmation by nuclear magnetic resonance and purity assessment by high-performance liquid chromatography. Mass spectrometry provides molecular weight confirmation and can detect related impurities. Purchasers should request a certificate of analysis that lists lot-specific data. Online products advertised for human use often lack such documentation. Distinguishing legitimate research material from mislabeled or contaminated samples is a recurring challenge in independent testing, and independent laboratories may use orthogonal methods to verify identity.
Detection of SR9009 in biological samples usually relies on liquid chromatography coupled to tandem mass spectrometry. This approach separates the compound from matrix components and identifies it by mass transitions. Because SR9009 can undergo metabolism, laboratories often look for both parent drug and specific metabolites. Sample preparation may involve protein precipitation or solid-phase extraction. Method validation examines sensitivity, carryover, and interference from related substances, and reference standards are required for accurate calibration.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | -20 °C or lower | Desiccated and protected from light |
| Common analytical method | LC-MS/MS | Detects parent drug and metabolites |
| Solubility class | Lipophilic; soluble in organic solvents | Low aqueous solubility |
| Molecular weight | 437.94 g/mol | Calculated from reported formula |
| Synonyms | SR9009; REV-ERB agonist | Code name used in scientific literature |
Research interest in SR9009 grew from studies of circadian biology and metabolic disease. Preclinical reports describe effects on exercise capacity, muscle metabolism, and blood lipid levels in rodents, but these findings come from controlled laboratory settings. The compound has low oral bioavailability in animals, which limits systemic exposure after swallowing. Investigators often use injected routes in experiments to achieve measurable plasma concentrations. Human clinical data are sparse, no approved therapeutic product exists, and whether animal effects translate to humans remains an open question.
Regulatory and sporting contexts treat SR9009 as a prohibited substance in many elite competitions. Its presence on banned lists reflects concerns about performance enhancement and unknown long-term safety. Analytical chemists have developed methods to detect the parent compound and its metabolites in urine and blood. Literature discussions distinguish between in vitro potency, animal pharmacology, and anecdotal human reports. The latter are difficult to verify because products sold online may lack purity or contain different compounds.
SR9009 is a synthetic small molecule studied as an agonist of the nuclear receptors REV-ERBα and REV-ERBβ. These receptors help regulate circadian rhythms, lipid metabolism, and inflammatory gene expression. In cell and animal experiments, SR9009 alters transcription of clock-controlled genes and metabolic pathways. The compound is not a hormone and does not resemble classical steroid structures. Its activity depends on binding to the ligand-binding domain of REV-ERB, where it can modify corepressor recruitment.
Identity and purity testing for SR9009 commonly uses liquid chromatography coupled with tandem mass spectrometry. This method separates the compound from matrix components and detects it by mass-to-charge transitions, providing sensitive and specific confirmation. Nuclear magnetic resonance spectroscopy can support structural identification, while high-performance liquid chromatography with ultraviolet detection may estimate purity. Because online products labeled as SR9009 may contain other substances or no active compound at all, independent verification is important in research settings. Certificates of analysis are useful but not a substitute for in-house testing.
Laboratory samples of SR9009 are typically supplied as a white to off-white powder. The compound dissolves readily in organic solvents such as dimethyl sulfoxide and ethanol, while its solubility in water is low. Because of this solubility profile, researchers often prepare concentrated stock solutions in an organic solvent before diluting them into aqueous assay buffers. Light exposure, moisture, and repeated freeze-thaw cycles can degrade many small molecules, so handling procedures usually aim to minimize these factors. Purity is commonly checked before use.
Handling recommendations for SR9009 in a laboratory setting include storing the solid at low temperature, protected from light and moisture. The compound is often dissolved in dimethyl sulfoxide or ethanol for experiments. Solutions should be prepared with appropriate personal protective equipment and disposed of according to local rules. Stability data for long-term storage are limited, so stock solutions are typically kept cold and used within defined periods. Records of preparation date and concentration support reproducibility.
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.
When a crystalline aqueous suspension of steroid is administered via intramuscular injection, a crystalline depot suspended in fluid is formed locally within the muscle. These crystals slowly dissolve and the steroid is gradually absorbed into the body, resulting in the long durations of such preparations. Particle sizes of 10 μm or less have no apparent depot effect. A larger needle size is needed for aqueous suspensions of steroids to allow the steroid crystals to pass through the needle lumen. Aqueous suspensions pose a risk of injection site reactions such as local irritation, swelling, and redness, with often severe pain. The reactions are worse with larger crystal sizes. Particle sizes of more than 300 μm in the case of estradiol benzoate have been found to be too painful for use. The local injection site reactions, which do not occur with oil solutions, have limited the clinical use of aqueous suspensions of estradiol and its esters as well as other steroids.
=== Seed === Plant cryopreservation is becoming vital for its biodiversity value. Seeds are often considered as an important delivery system of genetic information. Cryopreservation of recalcitrant seed is the hardest due to intolerance to low temperature and low water content. However, plant vitrification solution can solve the problem and help recalcitrant seed (Nymphaea caerulea) cryopreserve.
=== Controlling properties === The initial nucleation stages of the synthesis process heavily influence the properties of a nanoparticle. Nucleation, for example, is vital to the size of the nanoparticle. A critical radius must be met in the initial stages of solid formation, or the particles will redissolve into the liquid phase. The final shape of a nanoparticle is also controlled by nucleation. Possible final morphologies created by nucleation can include spherical, cubic, needle-like, worm-like, and more particles. Nucleation can be controlled predominately by time and temperature as well as the supersaturation of the liquid phase and the environment of the synthesis overall.
=== Pyrimidine catabolism === Cytosine and uracil are converted into beta-alanine, which is further processed into malonyl-CoA, a key precursor for fatty acid synthesis and other metabolic pathways. Thymine, on the other hand, is converted into β-aminoisobutyric acid, which is then used to form methylmalonyl-CoA. The remaining carbon skeletons, such as acetyl-CoA and succinyl-CoA, can be further oxidized in the citric acid cycle. Pyrimidine degradation ultimately results in the formation of ammonium, water, and carbon dioxide. The ammonium can then enter the urea cycle, which takes place in both the cytosol and mitochondria of cells. Pyrimidine bases can also be salvaged. For example, the uracil base can be combined with ribose-1-phosphate to form uridine monophosphate (UMP). A similar reaction occurs with thymine and deoxyribose-1-phosphate. Deficiencies in enzymes involved in pyrimidine catabolism can lead to diseases such as Dihydropyrimidine dehydrogenase deficiency, which causes neurological impairments.
=== Localization of VIP === VIP is highly localised in lungs (70%) and binds with alveolar type II (AT II) cells via VPAC1. The biological (vasodilator) activity of vasoactive intestinal peptide (VIP) was discovered in the lungs before the peptide was isolated and chemical identity characterized from intestine. VIP levels are also considerably high in the brain and the gut. It is localized in key sites in the lung, has potent activities on its major functions, and appears to play an important role in pulmonary physiology and disease. The principal localization of VIP-containing neurons in the tracheobronchial tree is in the smooth muscle layer, around submucosal mucous glands and in the walls of pulmonary and bronchial arteries. Immunoreactive VIP is also present in neuronal cell bodies forming microglia that provide a source of intrinsic innervation of pulmonary structures.
Sources: en.wikipedia.org
1 by the Minister, after consultation with such bodies representative of those interests as he may think fit, to represent the interests of persons (other than the British Transport Commission and any Executive) who are holders of A or B licences (within the meaning of Part IV of this Act) carrying on business within the London Traffic Area:† 1 by the Minister, after consultation with such bodies representative of those interests as he may think fit, to represent the interests of persons who are holders of C licences (within the meaning of Part IV of this Act) carrying on business within the London Traffic Area:† 1 by the Minister, after consultation with such bodies representative of those interests as he may think fit, to represent the interests of persons (other than the British Transport Commission and any Executive) who are the holders of licences authorising them to operate public service vehicles within the London Traffic Area: 1 by the Minister, after consultation with such bodies representative of those interests as he may think fit, to represent the interests of persons (other than the British Transport Commission and any Executive) providing or using horse-drawn road vehicles within the London Traffic Area. 1 by the Minister, after consultation with such bodies representative of those interests as he may think fit, to represent the interests of the taxi-cab industry within the London Traffic Area.
==== Polyfloral ==== Polyfloral honey, also known as wildflower honey, is derived from the nectar of many types of flowers. The taste may vary from year to year, and the aroma and the flavor can be more or less intense, depending on which flowers are blooming.
Nanofiltration Chromatography These extraction processes are considered "traditional processes" because they do not chemically affect the virus in any way; they simply remove it physically from the sample.
==== PowerPlay ==== PowerPlay was a technological initiative headed by Valve and Cisco Systems to decrease the latency for online games, announced in January 2000. It was described as a set of protocols and deployment standards at the router level to improve performance. It was claimed that a player with 1000 ms ping was able to play against another player on a LAN connection with no noticeable disadvantage. Initially the protocol was to be released with PowerPlay 1.0 focusing on quality of service (QoS) and later a revision, PowerPlay 2.0 that would focus on functionality. Cisco and Valve intended to deliver a single dial-up service in Q1 2000 in the United States with a 30-day free trial with a bundled copy of Team Fortress modified to support PowerPlay. The standard was to involve purchasing PowerPlay approved Cisco hardware and infrastructure that had adequate bandwidth and QoS standards that prioritize PowerPlay gaming packets at all others' expense. Newell conceded that Internet service providers (ISPs) would bear the brunt of this expense: "The ISPs are going to need to spend a fair amount of money to be compliant with PowerPlay. But how they get that back is up to them. Some will have a tiered service, and some will just try to recoup their investment through reduced customer churn and customer acquisition." Despite never deploying the dial-up plan featuring PowerPlay 1.0, Valve announced in January 2001 that the standard had indeed been finalized. 12 months after its announcement, PowerPlay was abandoned.
Sources: en.wikipedia.org
On April 2, 2011, a month and a half before the municipal elections and autonomous communities elections were held, Zapatero, under pressure from his own party, announced that he would not be the head of the list in the next general elections. However, Zapatero's resignation did not prevent the Socialist landslide in the municipal and autonomic elections, as the PSOE was 10 points behind the People's Party. Shortly afterwards the PSOE named Alfredo Pérez Rubalcaba as its new candidate for the presidency of government. The Sunday before the celebration of the municipal and autonomic elections, May 15, 2011, there were demonstrations of "outraged" ones, mostly young people, in the main Spanish cities called by the grassroots organization "¡Democracia Real YA!". The next day, a group of them decided to camp in the Puerta del Sol in Madrid and the eviction by the police only increased the number of campers who ended up occupying the entire square and getting great national and international media coverage, in addition to their example quickly spread to the squares of many cities. There they remained for several weeks. One of the most repeated slogans in the assemblies they held was "¡No nos representan!" ("They don't represent us!") in reference to the big political parties. Thus was born what would become known as the 15-M movement.
One key to compliance with many of these standards is audit logging of all changes to LIMS data, and in some cases a full electronic signature system is required for rigorous tracking of field-level changes to LIMS data.
When the backbone bonds cleave, six different types of sequence ions are formed as shown in Fig. 1. The N-terminal charged fragment ions are classed as a, b or c, while the C-terminal charged ones are classed as x, y or z. The subscript n is the number of amino acid residues. The nomenclature was first proposed by Roepstorff and Fohlman, then Biemann modified it and this became the most widely accepted version. Among these sequence ions, a, b and y-ions are the most common ion types, especially in the low-energy collision-induced dissociation (CID) mass spectrometers, since the peptide amide bond (CO-NH) is the most vulnerable and the loss of CO from b-ions. Mass of b-ions = Σ (residue masses) + 1 (H+) Mass of y-ions = Σ (residue masses) + 19 (H2O+H+) Mass of a-ions = mass of b-ions – 28 (CO) Double backbone cleavage produces internal ions, acylium-type like H2N-CHR2-CO-NH-CHR3-CO+ or immonium-type like H2N-CHR2-CO-NH+=CHR3. These ions are usually disturbance in the spectra.
The four substrates of this enzyme are albendazole, reduced nicotinamide adenine dinucleotide phosphate (NADPH), oxygen and a proton. Its products are ricobendazole (albendazole S-oxide), oxidised NADP+, and water. This enzyme is coded by the gene for FMO3 and is a flavin-containing monooxygenase that uses molecular oxygen as oxidant and incorporates one of its atoms into the starting material. The systematic name of this enzyme class is albendazole,NADPH:oxygen oxidoreductase (sulfoxide-forming). Other names in common use include albendazole oxidase, and albendazole sulfoxidase. It employs one cofactor, flavin adenine dinucleotide.
In other words, the lack of positive support and validation increases the risk for divorce. Because of the expansive research done on the significance of social support within a marriage, it is important to understand that this research was inspired by a theory called the attachment theory perspective. Attachment theory stresses the importance of support and care giving in a relationship for the development of trust and security. Attachment theory, as conceptualized by Collins and Feeney (2000) is an interpersonal, transactional process that involves one partners caregiving responses.
Sources: en.wikipedia.org
Liquid chromatography-tandem mass spectrometry is a common approach. It can detect the parent compound and its metabolites in biological matrices.
Research samples are typically kept frozen, desiccated, and protected from light. Stock solutions are often aliquoted to reduce freeze-thaw cycles.
High-performance liquid chromatography and nuclear magnetic resonance are standard for purity and identity. Mass spectrometry confirms molecular weight.
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.