A practical reference on REV-ERB agonist: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-06-16. Anything still debated is marked as such rather than presented as settled.
Because REV-ERB receptors are core clock components, SR9009 has been examined for effects on daily rhythms as well as metabolism. Research has explored whether the compound can shift or reinforce circadian gene expression in tissues such as liver and muscle. Some studies report improved metabolic markers in obese or diabetic mice, while others show context-dependent responses. Questions remain about which effects are direct, which are secondary to timing, and how they might differ across species.
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.
Handling practices for SR9009 focus on minimizing degradation and contamination. The solid is generally stored desiccated at or below -20 °C, protected from light and moisture. Stock solutions are often prepared in dimethyl sulfoxide or ethanol, then aliquoted to avoid repeated freeze–thaw cycles. Aqueous solubility is low, so formulations for animal studies may require cosolvents or suspending agents. Personnel should follow institutional chemical safety procedures, because toxicological data for humans are incomplete.
Regulatory status varies by country and intended use. Major drug agencies have not granted marketing authorization for SR9009 as a medicine, and it is not listed as a controlled substance in many jurisdictions. It is often sold as a research chemical, a category that may fall outside pharmaceutical manufacturing rules. Buyers should verify local laws and supplier documentation, including certificates of analysis. The lack of standardized quality controls raises concerns about identity, purity, and actual content in products marketed online.
| 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 |
Several misconceptions surround SR9009. It is often described as a SARM, a steroid, or an exercise pill, but its known target is the REV-ERB receptor family. Rodent studies have examined exercise capacity and metabolic markers, yet human outcomes remain unproven. Oral bioavailability appears low in animals, and human pharmacokinetics are not well characterized. Online products may contain impurities or different compounds, so identity and purity testing are important for research use.
Analytical chemists detect SR9009 with liquid chromatography-tandem mass spectrometry, commonly abbreviated LC-MS/MS. Sample preparation may involve protein precipitation, liquid-liquid extraction, or solid-phase extraction before analysis. Laboratories can target the parent compound or its metabolites, depending on the matrix and the purpose of testing. Anti-doping methods require sensitive and specific assays because concentrations in biological samples can be low. Reference standards and validated methods are essential for reliable identification and quantification.
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.
=== Matsuda === The Matsuda geometry consists of an 85° electric sector, a quadrupole lens and a 72.5° magnetic sector of the same curvature direction. This geometry is used in the SHRIMP and Panorama (gas source, high-resolution, multicollector to measure isotopologues in geochemistry).
== Mechanism of action == Duchenne muscular dystrophy is caused when a mutation in the DMD gene changes the DMD mRNA so that it no longer codes for functional dystrophin protein, usually due to a nonsense mutation that introduces a premature stop codon into the mRNA. If an exon with an appropriate number of bases lies near the mutation, by removing the defective exon the downstream reading frame can be corrected and production of partially functional dystrophin can be restored. This is the general strategy used for designing exon-skipping oligos for DMD; as there are 79 exons transcribed in the longest splice form of the dystrophin transcript, many different oligos are needed to address the range of mutations present in the population of people with DMD. Eteplirsen is a morpholino antisense oligomer which triggers excision of exon 51 during pre-mRNA splicing of the dystrophin RNA transcript. Skipping exon 51 changes the downstream reading frame of dystrophin; giving eteplirsen to a healthy person would result in production of dystrophin mRNA which would not code for functional dystrophin protein but, for DMD patients with particular nonsense mutations, giving eteplirsen can restore the reading frame of the dystrophin mRNA and result in production of functional (although modified by having an internal deletion consisting of both the patient's original defect, as well as the therapeutically skipped exon) dystrophin. Eteplirsen is given by intravenous infusion for systemic treatment of DMD.
=== Drifting osteons === Drifting osteons are a phenomenon that is not fully understood. A "drifting osteon" is classified as one that runs both longitudinally as well as transversely through the cortex. An osteon can "drift" in one direction or change directions several times, leaving a tail of lamella behind the advancing haversian canal.
The Zeisel determination for methoxyl group analysis indicated two methoxyl groups per molecule. John Elix and Brian Ferguson proposed a method for the total synthesis of confluentic acid in 1978. The synthesis began with the direct condensation of suitably substituted aromatic carboxylic acids and phenols, using dicyclohexylcarbodiimide. Key precursors involved were specially prepared benzoic acids, with protective measures for reactive groups. The process included steps like bromination, alkylation, and the strategic use of protecting groups for the phenol and carboxyl functionalities. The synthesis culminated in the removal of protecting groups and hydrogenolysis over palladised carbon to yield the desired depsides including confluentic acid. In 1993, G. Fegie and colleagues introduced a standardised high-performance liquid chromatographic method that enabled the separation and detection of hundreds of lichen products, confluentic acid included.
Sources: en.wikipedia.org
=== Dissolution and UN embargo === During the collapse of communism in Europe, Yugoslavia's republics introduced multiparty politics and held elections in 1990. During the same time, conflicts between the republics and the national communities intensified and federal institutions weakened. Just weeks after the first Croatian elections and after a Dinamo Zagreb-Red Star riot at the same stadium, at the Yugoslavia-Netherlands friendly in preparation for the 1990 World Cup, the Croatian crowd in Zagreb jeered the Yugoslav team and anthem and waved Dutch flags (owing to its resemblance to the Croatian tricolour). With the dissolution of Yugoslavia, the team split up and players joined the newly emerging national teams. The Belgrade-based team of the Federal Republic of Yugoslavia (FRY) was banned from competing at Euro 92 under UN sanctions. The decision was made on 31 May 1992, just 10 days before the competition commenced. The SFRY Yugoslav team had earned the top spot of their group during the disintegration, and the FRY team was unable to take its spot in the competition due to United Nations Security Council Resolution 757. Their place was taken by group runners-up Denmark, who went on to win the competition. After the breakup of Yugoslavia, Serbia and Montenegro proclaimed the state of FRY, which claimed to be the continuation of the previous Yugoslavia. A claim which was not generally accepted by the international community, except by FIFA and UEFA.
In most animal species, retinol is synthesized from the breakdown of the plant-formed provitamin, β-carotene. First, the enzyme beta-carotene 15,15'-dioxygenase (BCO-1) cleaves β-carotene at the central double bond, creating an epoxide. This epoxide is then attacked by water creating two hydroxyl groups in the center of the structure. The cleavage occurs when these alcohols are oxidized to the aldehydes using NAD+. The resultant retinal is then quickly reduced to retinol by the enzyme retinol dehydrogenase. Omnivore species such as dogs, wolves, coyotes and foxes in general are low producers of BCO-1. The enzyme is lacking in felids (cats), meaning that vitamin A requirements are met from the retinyl ester content of prey animals.
in 1806 both Russia and Britain had been positively eager to make peace, and they might well have agreed to terms that would have left the Napoleonic imperium almost completely intact. As for Austria and Prussia, they simply wanted to be left alone. To have secured a compromise peace, then, would have been comparatively easy. But Napoleon was prepared to make no concessions.
Nevertheless, all methods aforementioned have been associated with limited cardiac function improvements and limited cell survival once implanted in the fibrous myocardium. To resume, stem cells and delivery routes aforementioned are suitable for cardiomyoplasty as demonstrated safe with some degree of benefit for the patient. However, cardiac remodelling remains limited due to limited cell residency, impact of mechanical forces onto cell survival and tissue hypoxia. Furthermore, lack of cellular electrochemical coupling can lead to arrhythmias. Another point of consideration concerns the use of embryonic stem cells, whereby indifferentiation yields uncontrolled proliferation and possible consequent formation of teratomas. Also iPSCs have been associated with viral infection and eventual oncogenicity. Cardiac tissue engineering is a new technology based on the use of combinations of cells with regenerative capacity, biological and/or synthetic materials, cell signaling agents to induce the regeneration of an organ or damaged tissue. In an ideal scenario, regenerated tissue would reproduce sophisticated asymmetric helicodoidal architecture of the myocardium with the production of specialized extracellular matrix to stimulate vascularization in the implanted tissue. From a cellular perspective, available techniques are monolayer cell construct onto temperature-sensitive polymer, where their detachment is driven by behavior of the mechanical properties of the synthetic support without the need of any enzymatic digestion such as trypsin.
== Function == HIV-1 PR serves a dual purpose. Precursor HIV-1 PR is responsible for catalyzing its own production into mature PR enzymes via PR auto-processing. Mature protease is able to hydrolyze peptide bonds on the Gag-Pol polyproteins at nine specific sites, processing the resulting subunits into mature, fully functional proteins. These cleaved proteins, including reverse transcriptase, integrase, and RNaseH, are encoded by the coding region components necessary for viral replication.
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.
Liquid chromatography–mass spectrometry is common for identity and purity checks. High-performance liquid chromatography with ultraviolet detection can also be used. Both methods require a suitable reference standard.