If you have been reading about NR1D2 and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-02-05. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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 |
|---|---|---|
| Chemical class | Synthetic REV-ERB agonist | Small-molecule nuclear receptor ligand |
| Appearance | Off-white to pale yellow solid | Typical for research-grade powder |
| Solubility class | Soluble in DMSO; low water solubility | Common stock solutions use organic solvent |
| Typical stock solvent | Dimethyl sulfoxide | Used for laboratory assays |
| Common analytical method | HPLC with UV or mass detection | Used for identity and purity checks |
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.
Detection in biological samples can be complicated by rapid metabolism and low circulating concentrations. Some studies report phase I and phase II metabolites, and analytical methods may need to target those species in addition to the parent compound. Immunoassays are not broadly available, so mass spectrometry remains the main confirmatory approach. For anti-doping testing, laboratories look for SR9009 and its metabolites using validated LC-MS methods. Open questions include how long metabolites remain detectable and how different routes of administration alter detection windows.
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.
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.
The violent anti-Peruvian demonstrations in Ecuador and anti-Ecuadorian demonstrations in Peru, the mobilization of forces in both countries, everything made us hope that the armed conflict would break out in 1910, had it not been for the intervention of the United States, Brazil and Argentina. The hostilities between the two do not cease, which leads Ecuador in 1910 to establish a defensive alliance with Colombia, giving it 180,000 km2 of the Amazon area for payment, in exchange for strengthening a possible anti-Peruvian alliance between the two. A gesture that Colombia would betray in the eyes of Ecuador by ceding in 1922 to Peru, the common enemy, half of the territories ceded by it. In the middle of the 20th century, the degree of hostility would have increased to the point of a first armed confrontation in 1941, prompted by a seizure of Peruvian Amazonian territories at the hands of the Ecuadorian army, particularly the rubber zone. During the 2nd Peruvian-Ecuadorian War, the Porotillo Massacre broke out, whereby the Peruvian platoon, commanded by Alfredo Novoa Cava, was massacred in Cune by Ecuadorian troops on September 11, 1941, leaving only one survivor (the captain's nephew); This event, carried out in full truce, filled the Ecuadorian chiefs and officers with pride due to strong anti-Peruvian feelings, but not all the soldiers that made up the Ecuadorian detachment, who felt terrified by the fact that their superiors celebrated as one " victoria" a crime against humanity.
The dragon blood tree has an upturned, densely packed, umbrella-shaped crown. This evergreen species is named after its dark red resin, which is known as "dragon's blood". Unlike most monocot plants, Dracaena displays secondary growth; D. cinnabari even has growth zones resembling tree rings found in dicot tree species. Along with other arborescent Dracaena species it has a distinctive growth habit called "dracoid habitus". Its leaves are found only at the ends of its youngest branches and are shed every three or four years as new leaves simultaneously mature. Branching tends to occur when the growth of the terminal bud is stopped, through either flowering or traumatic events (e.g. herbivory). The tree measures up to 9 m (30 ft) in height and 12 m (39 ft) across the crown, and the trunk reaches up to 1.5 m (4 ft 11 in) DBH. The fruits of D. cinnabari are small fleshy berries containing between one and four seeds. As they develop they turn from green to black, and then become orange when ripe. The berries are eaten by birds (e.g. Onychognatus species) and thereby dispersed. The seeds are 4–5 mm (0.16–0.20 in) in diameter and weigh on average 68 mg. The berries exude a deep red resin colloquially known as dragon's blood. Like other monocotyledons such as palms, the dragon's blood tree grows from the tip of the stem, with the long, stiff leaves borne in dense rosettes at the end. It branches at maturity to produce an umbrella-shaped crown, with leaves that measure up to 60 cm (24 in) long and 3 cm (1.2 in) wide. The trunk and branches of D.
== History == Memphis mayor Watkins Overton put together a commission in 1927 to establish an airport. It was built on a 200-acre (81 ha) plot of farmland seven miles (11 km) from downtown Memphis and opened on June 14, 1929, as Memphis Municipal Airport. The two-day dedication ceremony featured aerial stunts and the arrival of over 200 aircraft. In its early years the airport had three hangars and a sod runway. Standard Oil of Louisiana built the terminal after securing the right to supply all of the airfield's oil and gasoline. In 1930, runway lights were installed after an aircraft landed in the Mississippi River because it could not find the airport at night. Robertson Aircraft Corporation, which would merge into American Airways, started passenger flights to New Orleans and St. Louis in April 1930 on Ryan monoplanes. The following June, American Airways commenced the first airmail service from Memphis. Chicago and Southern Air Lines was headquartered in the city from 1934 to 1935 and from 1941 to 1953, when it was acquired by Delta Air Lines. During the 1930s, Memphis figured on American's east–west route between New York and Los Angeles and on Chicago and Southern's north–south route linking Chicago to New Orleans. The Works Progress Administration helped construct a new terminal building, which was inaugurated in October 1938. It had three stories and an Art Deco design. That year 31,000 passengers used the airport. After the United States entered World War II, the city government leased the airfield to the War Department in July 1942.
====== Stimulation of inflammasome helps protect against SeV infection ====== Using human embryonic kidney cells (HEK 293T) it has been shown that SeV can stimulate production of a pattern recognition receptor NLRC5, which is a cytosolic protein expressed mainly in hematopoietic cells. This production activates the cryopyrin (NALP3) inflammasome. Using human monocytic cell line-1 (THP-1) it has been shown that SeV can activate signal transduction by mitochondrial antiviral-signaling protein signaling (MAVS), which is a mitochondria-associated adaptor molecule that is required for optimal NALP3-inflammasome activity. Through MAVS signaling SeV stimulates the oligomerization of NALP3 and triggers NALP3-dependent activation of caspase-1 that, in turn, stimulates caspase 1-dependent production of interleukine -1 beta (IL-1β).
Sources: en.wikipedia.org
Different levels of substitution form a range of compositions, with endmembers monazite [2REE(PO4)], brabantite [Ca,Th(PO4)2] and huttonite [2ThSiO4]. The level of substitution usually depends upon melt composition and the geological environment.
== Further reading == Dean L (2012). "Omeprazole Therapy and CYP2C19 Genotype". In Pratt VM, McLeod HL, Rubinstein WS, et al. (eds.). Medical Genetics Summaries. National Center for Biotechnology Information (NCBI). PMID 28520353. Bookshelf ID: NBK100895.
=== Eating disorders === The American Dietetic Association discussed that vegetarian diets may be more common among adolescents with eating disorders, indicating that vegetarian diets do not cause eating disorders, but rather "vegetarian diets may be selected to camouflage an existing eating disorder".
Sources: en.wikipedia.org
SR9009 is a synthetic research compound that acts on REV-ERB nuclear receptors. It is not approved for human use and is sold only as a research chemical. Its effects have been studied mainly in cells and rodents.
It binds REV-ERB alpha and REV-ERB beta and changes the expression of genes tied to metabolism and circadian rhythm. These changes can affect mitochondria and energy use in animal models. The exact chain from receptor binding to physiological outcome is still being mapped.
No reliable human trials show that SR9009 improves athletic performance. Some rodent studies report endurance changes, but these results are not proof of human benefit. Its use in sport is prohibited, and quality and safety data are lacking.
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.