NR1D1 raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-09-17. Anything still debated is marked as such rather than presented as settled.
Storage conditions for research-grade SR9009 generally involve a freezer at approximately minus twenty degrees Celsius, sometimes lower for long-term preservation. Containers should remain tightly closed and protected from light. Desiccants may be used to limit moisture uptake. Solutions are often stored in aliquots to avoid repeated warming and cooling. Stability data for the compound under various conditions are limited, so laboratories typically follow supplier recommendations and verify performance through periodic analytical checks rather than assuming indefinite stability.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Typical for research-grade material |
| Solubility | Soluble in DMSO and ethanol; low aqueous solubility | Organic stock solutions are common |
| Typical storage temperature | -20 °C or lower | Protect from light and moisture |
| Common analytical method | LC-MS/MS | Used for detection and confirmation |
| Common synonyms | SR9009; Stenabolic | Stenabolic is an informal name |
Stability depends on physical form, temperature, light exposure, and solvent. Solid SR9009 is generally stored cold and dry, with protection from light to limit degradation. Dimethyl sulfoxide stocks are common for laboratory work, but repeated freeze-thaw cycles can reduce compound integrity. Aqueous solutions may be less stable than organic stocks, and the ethyl ester in the structure can be susceptible to hydrolysis under certain conditions. Researchers typically validate storage conditions and recheck purity before quantitative experiments, especially when using archived material.
Regulatory treatment of SR9009 varies by country and region. It is not approved as a pharmaceutical, and several jurisdictions restrict its sale for human consumption. Some authorities classify it as a research chemical, a prescription-only substance, or a prohibited performance-enhancing agent in sport. Purchasers may encounter certificates of analysis, but these documents do not guarantee identity, purity, or legality. In research settings, institutional safety reviews and controlled procurement help ensure that materials are handled under appropriate oversight. The absence of harmonized rules means that legal status can change and requires verification.
== Cause == The toxic dose of paracetamol is highly variable. In general the recommended maximum daily dose for healthy adults is 4 grams. Higher doses lead to increasing risk of toxicity. In adults, single doses above 10 grams or 200 mg/kg of bodyweight, whichever is lower, have a reasonable likelihood of causing toxicity. Toxicity can also occur when multiple smaller doses within 24 hours exceed these levels. Following a dose of 1 gram of paracetamol four times a day for two weeks, patients can expect an increase in alanine transaminase in their liver to typically about three times the normal value. It is unlikely that this dose would lead to liver failure. Studies have shown significant hepatotoxicity is uncommon in patients who have taken greater than normal doses over 3 to 4 days. In adults, a dose of 6 grams a day over the preceding 48 hours could potentially lead to toxicity, while in children acute doses above 200 mg/kg could potentially cause toxicity. Acute paracetamol overdose in children rarely causes illness or death, and it is very uncommon for children to have levels that require treatment, with chronic larger-than-normal doses being the major cause of toxicity in children. Intentional overdosing (self-poisoning, with suicidal intent) is frequently implicated in paracetamol toxicity. In a 2006 review, paracetamol was the most frequently ingested compound in intentional overdosing. In rare individuals, paracetamol toxicity can result from normal use.
== Medical uses == Tralokinumab is indicated for the treatment of moderate-to-severe atopic dermatitis in adults who are candidates for systemic therapy. In the United States, tralokinumab is indicated for the treatment of moderate-to-severe atopic dermatitis in adults whose disease is not adequately controlled with topical prescription therapies or when those therapies are not advisable.
Conservative options include pelvic floor muscle strengthening exercises, and pessaries. Pelvic floor muscle training (PFMT), also known as Kegel exercise, has been found to improve the bulk and urinary symptoms associated with pelvic organ prolapse and improve quality of life when performed consistently and correctly. Pessaries are a mechanical treatment that supports the vagina and elevates the prolapsed uterus to its anatomically correct position. Pessaries are frequently offered as a first-line management option for uterine prolapse, especially amongst people who cannot or do not wish to undergo surgery, due to their affordability and low-risk profile compared to more invasive procedures. When properly fitted, pessaries have been found to improve bulk and pressure symptoms associated with prolapse and improve quality of life measures.
The Cherokee Freedmen, descendants of African American slaves owned by citizens of the Cherokee Nation during the Antebellum Period, were first guaranteed Cherokee citizenship under a new treaty made in 1866 with the United States. This was in the wake of the American Civil War, when the US emancipated slaves by passing a constitutional amendment granting freedmen citizenship in the United States. After the war the US government required that the Cherokee Nation, which under pressure had briefly allied with the Confederate States of America, end slavery and grant full citizenship to Freedmen living within their nation. Those who left could become United States citizens. However, despite "the promises of the 1866 treaty, the freedmen were never fully accepted as citizens of the Cherokee Nation" during the 19th and 20th centuries. In practice, enrollment in the Cherokee Nation rolls was often strongly influenced by race. During creation of the Dawes Rolls prior to allotment of tribal communal lands to households, many Freedmen and Afro-Cherokees were listed separately from Cherokee by blood, regardless of their ancestry or culture. As a result, they did not receive land allotments and later were for a time excluded from tribal membership.
The Roman mythographer Julius Pollux, writing in the 2nd century AD, recounts that the purple dye was first discovered by Heracles (Greek counterpart of the titular god of Tyre, Melqart) while being in Tyre to visit his beloved Tyros, or rather, by his dog, whose mouth was stained purple after biting into a snail on the beach. This story was depicted by Peter Paul Rubens in his painting Hercules' Dog Discovers Purple Dye. According to John Malalas, the incident happened during the reign of the legendary King Phoenix of Tyre, the eponymous progenitor of the Phoenicians, and therefore he was the first ruler to wear Tyrian purple and legislate on its use. Recently, the archaeological discovery of substantial numbers of Murex shells on Crete suggests that the Minoans may have pioneered the extraction of Imperial purple centuries before the Tyrians. Dating from collocated pottery suggests the dye may have been produced during the Middle Minoan period in the 20th–18th century BC. Accumulations of crushed murex shells from a hut at the site of Coppa Nevigata in southern Italy may indicate production of purple dye there from at least the 18th century BC. Additional archaeological evidence can be found from samples originating from excavations at the extensive Iron Age copper smelting site of "Slaves' Hill" (Site 34), which is tightly dated by radiocarbon to the late 11th–early 10th centuries BC. Findings from this site include evidence of the use of purple dye found in stains used on pot shards.
Sources: en.wikipedia.org
Trans fats occur in meat and dairy products from ruminants. For example, butter contains about 3% trans fat by weight. These naturally occurring trans fats include conjugated linoleic acid (CLA) and vaccenic acid (trans-11 18:1). They arise from the action of bacteria in the rumen. Polyunsaturated fats are toxic to the rumen-based bacteria, which detoxify the fats by changing some cis-double bonds to trans-double bonds. In contrast to industrially produced trans fats, this bacterial process produces only a few specific isomers. Conjugated trans fatty acids such as CLA are exempt from counting as trans fat in the US. The Codex Alimentarius includes an analogous exclusion. As industrial sources of trans fats are eliminated, increased attention focuses on ruminant derived trans fats. Not all ruminant-derived trans fats are innocuous like vaccenic acid and its metabolite rumenic acid (cis-9-trans-11 CLA / 18:2). In particular, trans-10 18:1 is not turned into a conjugated linoleic acid by humans. It appears to have health consequences comparable to trans fats of industrial origin.
=== Pharmacodynamics === Leucine is a dietary amino acid with the capacity to directly stimulate myofibrillar muscle protein synthesis. This effect of leucine results from its role as an activator of the mechanistic target of rapamycin (mTOR), a serine-threonine protein kinase that regulates protein biosynthesis and cell growth. The activation of mTOR by leucine is mediated through Rag GTPases, leucine binding to leucyl-tRNA synthetase, leucine binding to sestrin 2, and possibly other mechanisms.
The CDA must be enantiomerically pure, or (less satisfactorily) its enantiomeric purity must be accurately known. The reaction of the CDA with both enantiomers should go to completion under reaction conditions. This acts to avoid enrichment or depletion of one enantiomer of the analyte by kinetic resolution. CDA must not racemize under derivatization or analysis conditions. Its attachment should be mild enough so that the substrate does not racemize either. If analysis is completed by HPLC, the CDA must contain a chromophore to enhance detectability. If analysis is completed by NMR, the CDA should have a functional group that gives a singlet in the resultant NMR spectrum, where the singlet must be remote from other peaks.
The Swiss Federal Tribunal (SFT) has decided not to entertain the appeal filed by the players against the CAS award of 11 January 2016, imposing a 2-year ban on each player following an anti-doping rule violation. The SFT determined that since the players did not formally challenge the jurisdiction of CAS during the arbitration procedure and accepted the application of the CAS Rules (including the rule providing for a de novo hearing, i.e. for a procedure allowing the CAS to conduct a full review of the case), they had lost their right to challenge the CAS jurisdiction in appeal. The SFT added that, even if the players had properly challenged the jurisdiction of CAS, CAS jurisdiction in this matter would have been confirmed, and the appeal would have been dismissed. The players did not seek an injunction against their suspensions when appealing with the Federal Supreme Court, meaning that they would have served their 2016 suspensions even if the guilty verdicts had been cleared. This was to eliminate any risk that a new, two-year period of suspension could be ordered to be served in full if the appeal were unsuccessful.
Sources: en.wikipedia.org
Research-grade SR9009 is typically stored frozen at about minus twenty degrees Celsius, protected from light and moisture. Stock solutions are often kept in aliquots to avoid repeated freeze-thaw cycles. Specific storage conditions should follow the supplier's documentation.
Liquid chromatography with tandem mass spectrometry is widely used to detect and confirm SR9009 in laboratory samples. The technique offers high sensitivity and can distinguish the target compound from related substances. Nuclear magnetic resonance and ultraviolet detection may support identity and purity checks.
Online products labeled as SR9009 may vary in identity, purity, and actual content. Independent testing helps confirm that a sample matches its label and does not contain unexpected contaminants. This is important for reproducible research and for interpreting experimental results.
SR9009 is a synthetic research compound that activates the REV-ERBα and REV-ERBβ nuclear receptors. It is not an approved drug and has no established human therapeutic use. Most published biological data come from cell and rodent studies.