A practical reference on nuclear receptor: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-10-13. Anything still debated is marked as such rather than presented as settled.
Pharmacokinetic data for SR9009 are limited in published literature. Some reports indicate low oral bioavailability and rapid clearance in animals, which complicates interpretation of exposure and effect. Researchers often use injected routes in preclinical work to achieve measurable systemic levels. Analytical studies rely on mass spectrometry to detect the parent compound and its metabolites. Questions about tissue distribution, active metabolites, and long-term consequences remain open. Species differences in metabolism can affect observed half-life and target engagement.
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 and metabolic gene expression. In laboratory experiments, SR9009 binds these receptors and alters transcription of genes involved in lipid handling, glucose metabolism, and mitochondrial function. It is not a naturally occurring compound and has no approved therapeutic use. Research interest stems from its ability to modify energy metabolism in cells and animal models.
SR9009 is frequently discussed alongside other REV-ERB ligands, including synthetic agonists and natural heme-related molecules. Its selectivity for REV-ERB over related nuclear receptors has been measured in binding and reporter assays, though off-target activity at higher concentrations is possible. The compound is prohibited in sport by the World Anti-Doping Agency, and it is not approved for any medical use in major jurisdictions. Products sold online may be labeled as research chemicals, and their identity and purity are not guaranteed by regulatory review.
SR9009 is a synthetic small molecule that acts on the nuclear receptors REV-ERBα and REV-ERBβ. These receptors are part of the circadian clock machinery and normally repress transcription of certain target genes. In laboratory research, SR9009 is used as a chemical tool to study how REV-ERB activity influences metabolism, inflammation, and daily biological rhythms. The compound is not an approved medicine, and its effects in humans remain largely uncharacterized. It is often described as an investigational agent rather than a therapeutic product.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic small-molecule REV-ERB agonist | Not a hormone or natural product |
| Primary targets | REV-ERBα and REV-ERBβ | Nuclear receptors involved in circadian and metabolic regulation |
| Appearance | White to off-white solid | Typical for purified research samples |
| Solubility | Soluble in DMSO and ethanol; low water solubility | Laboratory solubility depends on solvent and purity |
| Common synonyms | SR9009; Stenabolic | Stenabolic is a colloquial name, not a formal chemical name |
Detection of SR9009 in biological samples usually employs liquid chromatography coupled with tandem mass spectrometry. This method can identify the parent compound and sometimes metabolites in urine or blood. Because exposure can be low and clearance may be rapid, sample timing and limits of detection matter. Laboratories validate assays for sensitivity and specificity. Results are interpreted alongside chain-of-custody and quality-control records. Urine is the common matrix for anti-doping analysis, while blood may be used in research settings.
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.
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.
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 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.
Uniform and genetically stable cultivars can be inadequate for dealing with environmental fluctuations and novel stress factors. Plant breeders have focused on identifying crops which will ensure crops perform under these conditions; a way to achieve this is finding strains of the crop that is resistance to drought conditions with low nitrogen. It is evident from this that plant breeding is vital for future agriculture to survive as it enables farmers to produce stress resistant crops hence improving food security. In countries that experience harsh winters such as Iceland, Germany and further east in Europe, plant breeders are involved in breeding for tolerance to frost, continuous snow-cover, frost-drought (desiccation from wind and solar radiation under frost) and high moisture levels in soil in winter. Breeding is not a quick process, which is especially important when breeding to ameliorate a disease. The average time from human recognition of a new fungal disease threat to the release of a resistant crop for that pathogen is at least twelve years.
Interpretation for primary aldosterone deficiency The aldosterone response in the ACTH stimulation test is blunted or absent in patients with primary adrenal insufficiency including Addison's disease. The base value is usually in the mid-teens or less and rise to less than double the base value thus indicating primary hypoaldosteronism (sodium low, potassium and renin enzyme will be high) and is an indicator of primary adrenal insufficiency or Addison's disease.
Romanowsky's research for his medical degree in 1880s was mainly on the identification of malarial parasite (Plasmodium). Until that time malarial infection was difficult to confirm as the parasites were hard to distinguish from blood cells or cell organelles. Pigmented blood cells were often linked to malarial infection, but the pigments are not always visible. When French physician Charles Louis Alphonse Laveran discovered and described the malarial protozoan (later called Plasmodium falciparum) in 1880, it was not accepted as no protozoan had ever been seen in blood cells or associated with malaria. In 1871, German chemist Adolf von Baeyer synthesised a red dye called eosin (Greek word for "morning red"), which in 1876 was found to be useful for staining tissues. Another German chemist Heinrich Caro synthesised a blue dye named methylene blue in 1876, which was first used as a cell stain by Robert Koch. In 1882, using methylene blue Koch discovered the causative bacterium of tuberculosis, tubercle bacillus (now Mycobacterium tuberculosis). The two stains remain among the fundamental stains used in general cell and tissue staining, as well as in clinical diagnosis.
56. Neuro Endocrinol Lett. 2002 Aug;23(4):365-8. Pineal-regulating tetrapeptide epitalon improves eye retina condition in retinitis pigmentosa. Khavinson V(1), Razumovsky M, Trofimova S, Grigorian R, Razumovskaya A. Author information: (1)St. Petersburg Institute of Bioregulation and Gerontology, North-Western Branch of the Russian Academy of Medical Sciences, 3 Dynamo Project, 197110 St. Petersburg, Russia. ibg@medport.ru We have studied the effect of tetrapeptide Epitalon (Ala-Glu-Asp-Gly) on the course of congenital pigmented degeneration of the retina. The application of Epitalon in Campbell rats is found to intensify the bioelectric and functional activity of the retina due to the preservation of its morphological structure. Epitalon therapy in patients with degenerative retinal lesions results in a positive clinical effect in 90% of the cases. The analysis of Epitalon effects suggests that the tetrapeptide participates in the mechanisms of transcription common for the epiphysis and retina.
A distinctive feature of collagen is the regular arrangement of amino acids in each of the three chains of these collagen subunits. The sequence often follows the pattern Gly-Pro-X or Gly-X-Hyp, where X may be any of various other amino acid residues. Proline or hydroxyproline constitute about 1/6 of the total sequence. With glycine accounting for the 1/3 of the sequence, this means approximately half of the collagen sequence is not glycine, proline or hydroxyproline, a fact often missed due to the distraction of the unusual GX1X2 character of collagen alpha-peptides. The high glycine content of collagen is important with respect to stabilization of the collagen helix, as this allows the very close association of the collagen fibers within the molecule, facilitating hydrogen bonding and the formation of intermolecular cross-links. This kind of regular repetition and high glycine content is found in only a few other fibrous proteins, such as silk fibroin. Collagen is not only a structural protein. Due to its key role in the determination of cell phenotype, cell adhesion, tissue regulation, and infrastructure, many sections of its non-proline-rich regions have cell or matrix association/regulation roles. The relatively high content of proline and hydroxyproline rings, with their geometrically constrained carboxyl and (secondary) amino groups, along with the rich abundance of glycine, accounts for the tendency of the individual polypeptide strands to form left-handed helices spontaneously, without any intrachain hydrogen bonding.
Sources: en.wikipedia.org
Because glycine is the smallest amino acid with no side chain, it plays a unique role in fibrous structural proteins. In collagen, Gly is required at every third position because the assembly of the triple helix puts this residue at the interior (axis) of the helix, where there is no space for a larger side group than glycine's single hydrogen atom. For the same reason, the rings of the Pro and Hyp must point outward. These two amino acids help stabilize the triple helix – Hyp even more so than Pro because of a stereoelectronic effect; a lower concentration of them is required in animals such as fish, whose body temperatures are lower than most warm-blooded animals. Lower proline and hydroxyproline contents are characteristic of cold-water, but not warm-water fish; the latter tend to have similar proline and hydroxyproline contents to mammals. The lower proline and hydroxyproline contents of cold-water fish and other poikilotherm animals lead to their collagen having a lower thermal stability than mammalian collagen. This lower thermal stability means that gelatin derived from fish collagen is not suitable for many food and industrial applications. The tropocollagen subunits spontaneously self-assemble, with regularly staggered ends, into even larger arrays in the extracellular spaces of tissues. Additional assembly of fibrils is guided by fibroblasts, which deposit fully formed fibrils from fibripositors.
=== Composition === When dry, gelatin consists of 98–99% protein, but it is not a nutritionally complete protein since it is missing tryptophan and is deficient in isoleucine, threonine, and methionine. The amino acid content of hydrolyzed collagen is the same as collagen. Hydrolyzed collagen contains 19 amino acids, predominantly glycine (Gly) 26–34%, proline (Pro) 10–18%, and hydroxyproline (Hyp) 7–15%, which together represent around 50% of the total amino acid content. Glycine is responsible for close packing of the chains. Presence of proline restricts the conformation. This is important for gelation properties of gelatin. Other amino acids that contribute highly include: alanine (Ala) 8–11%; arginine (Arg) 8–9%; aspartic acid (Asp) 6–7%; and glutamic acid (Glu) 10–12%.
=== Neutron source === The oxide of 241Am pressed with beryllium is an efficient neutron source. Here americium acts as the alpha source, and beryllium produces neutrons owing to its large cross-section for the (α,n) nuclear reaction:
Hypotension (low blood pressure) Dysphoria Tachycardia Malaise Psychomotor impairment It is not believed to be addictive but is known to produce mild withdrawal effects (e.g., anorexia) after abrupt discontinuation.
Sources: en.wikipedia.org
== Further reading == Schüring, J.; Schulz, H. D.; Fischer, W. R.; Böttcher, J.; Duijnisveld, W. H., eds. (1999). Redox: Fundamentals, Processes and Applications. Heidelberg: Springer-Verlag. p. 246. hdl:10013/epic.31694.d001. ISBN 978-3-540-66528-1. Tratnyek, Paul G.; Grundl, Timothy J.; Haderlein, Stefan B., eds. (2011). Aquatic Redox Chemistry. ACS Symposium Series. Vol. 1071. doi:10.1021/bk-2011-1071. ISBN 978-0-8412-2652-4.
=== Sahrawi Arab Democratic Republic === The Castillo Administration recognized the Sahrawi Arab Democratic Republic, a partially-recognized state claimed by Morocco. Although the recognition came without forewarning, officially it was due to Castillo's push for a foreign policy based on self-determination and non-intervention. The Congressional opposition has opposed the recognition of the SADR, claiming that it creates geopolitical instability and risks Peru's relations with the Middle East.
== Select research interests == Research in Cooks' laboratory (the Aston Laboratories) has contributed to a diverse assortment of areas within mass spectrometry, ranging from fundamental research to instrument and method development to applications. Cooks' research interests over the course of his career have included the study of gas-phase ion chemistry, tandem mass spectrometry, angle-resolved mass spectrometry and energy-resolved mass spectrometry (ERMS); dissociation processes, including collision-induced dissociation (CID), surface-induced dissociation (SID), and photodissociation (PD); and desorption processes, including secondary ion mass spectrometry (SIMS), laser desorption ionization (LDI) and desorption electrospray ionization (DESI). His research has ranged through areas from preparative mass spectrometry, ionization techniques and quadrupole ion traps (QITs) and related technologies to as far afield as abiogenisis (also known as "the origin of life") via homochirality.
Åland Islands Peace Institute Demos Helsinki European Centre of Excellence for Countering Hybrid Threats (Hybrid CoE) Crisis Management Initiative (CMI) Research Institute of the Finnish Economy (Etla) Finnish Institute of International Affairs In addition to specific independent think tanks, the largest political parties have their own think tank organizations. This is mainly due to support granted by state for such activity. The corporate world has focused their efforts to central representative organization Confederation of Finnish Industries, which acts as think tank in addition to negotiating salaries with workers unions. Furthermore, there is the Finnish Business and Policy Forum (Elinkeinoelämän valtuuskunta, EVA). Agricultural and regional interests, associated with The Central Union of Agricultural Producers and Forest Owners (Maa- ja metsätaloustuottajain Keskusliitto, MTK) and the Centre Party, are researched by Pellervo Economic Research (Pellervon taloustutkimus, PTT). The Central Organisation of Finnish Trade Unions (Suomen Ammattiliittojen Keskusjärjestö, SAK) and the Social Democratic Party are associated with the Labour Institute for Economic Research (Palkansaajien tutkimuslaitos, PT). Each of these organizations often release forecasts concerning the national economy.
=== Camille Braverman === Camille Braverman (Bonnie Bedelia) is the matriarch of the family and Zeek's wife. She is an artist and also shows herself to be very capable domestically, striving to keep her family happy and peaceful. In season one, when Zeek reveals that he made a bad investment that he kept from Camille, she reveals that he was having an affair. Zeek later reveals that they both cheated. Camille confirms to her daughter, Sarah, that she has been having an affair with her art teacher, Matthew, but that she has ended it. In season one, it is stated that she has been married to Zeek for 46 years. She is 63 when the series begins, meaning she was about 17 when she married Zeek. She was 23 when she had Adam, 25 when she had Sarah, 28 when she had Crosby, and 31 when she had Julia. After Zeek's death, she is shown as having traveled to France, to the place where Zeek had planned to take her as a surprise in an earlier episode. As she is shown in other scenes in the finale's final montage, she returns from her trip at some unknown point.
Sources: en.wikipedia.org
It is a synthetic research compound that activates REV-ERB nuclear receptors. It is not an approved drug or dietary supplement. Most information comes from cell and animal studies.
It binds REV-ERBα and REV-ERBβ and changes transcription of metabolic genes. This can affect circadian rhythm, lipid use, and mitochondrial function. The full downstream effects are still under study.
No. Some rodent studies show increased endurance, but controlled human trials are lacking. Claims about human performance are not established by published evidence.
SR9009 is a synthetic research compound that binds and modulates the nuclear receptors REV-ERBα and REV-ERBβ. It is used in laboratory studies of circadian biology and metabolism, not as an approved medicine. It is also known by the informal name Stenabolic.