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 2026-01-27 and is reviewed periodically as new material appears.
Cardarine is a common name for GW501516, a synthetic compound developed in the 1990s through research collaborations involving GlaxoSmithKline. It belongs to a class of molecules known as peroxisome proliferator-activated receptor delta agonists. Early studies explored its effects on lipid metabolism and energy expenditure in animal models. The compound was never approved as a human medicine, and clinical development was discontinued. In the years since, it has appeared in fitness and bodybuilding communities as a performance-enhancing substance. Regulatory agencies classify it as an unapproved drug.
PPARδ is a nuclear receptor that regulates gene expression related to fatty acid oxidation, glucose homeostasis, and mitochondrial function. GW501516 binds to this receptor with high affinity and activates downstream signaling in skeletal muscle and other tissues. Animal studies reported increased endurance and altered fuel preference, but human data remain limited and inconsistent. The precise relationship between receptor activation and observed physiological changes is still an area of active investigation. Researchers have also examined whether the compound affects inflammation or cell proliferation. No approved therapeutic indication exists for cardarine.
In laboratory settings, cardarine is studied as a tool compound for probing PPARδ biology. Published experiments often use cell cultures, rodent models, or isolated tissues. Some investigations focus on metabolic effects, while others assess potential risks such as carcinogenicity observed in long-term animal studies. Because human trials are sparse, most knowledge comes from preclinical work and adverse event reports. Scientific literature frequently notes the gap between animal findings and human outcomes. The compound is not a dietary supplement and is not intended for human consumption.
GW501516 acts as a selective agonist at PPARδ, a nuclear receptor that regulates transcription of genes involved in lipid handling and energy metabolism. Activation of PPARδ in preclinical models increases fatty acid oxidation, mitochondrial biogenesis, and exercise endurance in rodents. These effects have made the compound a subject of metabolic research and also a target for sport anti-doping rules. In humans, however, controlled studies are limited, and whether similar endurance or metabolic changes occur at tolerated exposures remains an open question. The receptor’s broad tissue distribution also means downstream effects may vary by organ and condition.
Detection of GW501516 in biological samples generally relies on liquid chromatography coupled with tandem mass spectrometry. Urine is a common matrix in anti-doping analysis, while blood or plasma may be used in research settings. Sample preparation can involve enzymatic hydrolysis, protein precipitation, or solid-phase extraction before instrumental analysis. Because the compound undergoes metabolism, assays may target the parent molecule, one or more metabolites, or both. Detection windows are not fixed; they depend on factors such as dose, route, individual metabolism, and assay sensitivity. Reference standards are required for accurate identification and quantification.
Handling and quality assessment of cardarine reference material follow general laboratory practices for poorly characterized compounds. It typically appears as a white to off-white powder and is sparingly soluble in water but soluble in organic solvents such as dimethyl sulfoxide and ethanol. Storage recommendations usually specify a cool, dry, dark place, with long-term storage at low temperature and desiccation. Purity may be checked by high-performance liquid chromatography with ultraviolet detection, while identity is confirmed by mass spectrometry and nuclear magnetic resonance. No pharmacopeial monograph exists, so reported purity and stability depend on the supplier’s methods.
| Property | Value | Notes |
|---|---|---|
| CAS Registry Number | 317318-70-0 | Unique identifier for the compound. |
| Chemical class | PPARδ agonist | Synthetic ligand for peroxisome proliferator-activated receptor delta. |
| Appearance | White to off-white solid | Typical form of research-grade material. |
| Solubility | Soluble in DMSO and ethanol | Poorly soluble in water. |
| Typical storage | -20°C | Recommended for long-term storage of stock solutions. |
GW501516 acts as a ligand for PPAR delta, a nuclear receptor that regulates transcription of genes involved in fatty acid oxidation and energy use. Activation of this receptor in skeletal muscle shifts metabolism toward fat burning in animal models. The compound does not burn fat directly; it changes gene expression over hours to days. Researchers study it to understand metabolic flexibility and exercise adaptation. Effects observed in rodents are not automatically expected in humans.
Preclinical research reported that GW501516 increased running endurance in mice and improved lipid profiles in some animal species. Early human trials explored effects on high-density lipoprotein cholesterol, triglycerides, and glucose handling, but the program was discontinued. Published human data are sparse and do not establish efficacy for any condition. Studies also examined PPAR delta in cancer biology, with conflicting findings across models. The relationship between receptor activation, tissue context, and disease risk remains an active area of investigation.
GW501516 binds and activates PPARδ, a nuclear receptor that influences transcription of genes involved in fatty acid oxidation and energy use. Activation shifts some metabolic pathways in preclinical models, which is why the compound has been studied for lipid disorders and exercise-related endpoints. The exact downstream effects in humans are incompletely mapped. PPARδ is expressed in many tissues, including skeletal muscle, liver, and adipose tissue, so broad activation may have varied consequences. Researchers continue to examine how selective or partial activation might alter the balance between benefits and risks.
Published human data are sparse and mostly come from early-phase trials. Those studies examined short-term changes in lipids, glucose, and exercise capacity, but they were not large enough to establish efficacy or long-term safety. Some animal experiments reported increased running endurance, yet such findings do not prove a performance benefit in people. Anti-doping laboratories detect GW501516 and its metabolites in urine or blood using liquid chromatography-tandem mass spectrometry. Detection windows depend on dose, sample type, and individual metabolism. The method is sensitive enough to identify trace residues in tested samples.
== Medical uses == The chikungunya vaccine is indicated for the prevention of disease caused by chikungunya virus. In the European Union, use of the live attenuated vaccine (Ixchiq) has been restricted to individuals with a high risk of becoming infected with the chikungunya virus. This restriction is due to safety concerns resulting from side effects of the vaccince.
In addition, San Martín came to be accused of falling into a serious anti-Peruvian hypocrisy with the monarchical project of the Protectorate of San Martín, by preferring the coming of European princes (betraying several nationalist Peruvians), leaving aside the already existing and millennial institutions national monarchists in Peru to imitate the parliamentary constitutionalism of the English and French in the restoration (being accused of being Anglophile and Frenchified by Peruvian Hispanicism), as well as having little or no consideration for monarchical proposals that represented the interests of the indigenous nobility (being accused of Criollo elitist by the Peruvian indigenism). For example, the case of the indigenous nobility of the Cajamarca region, which, after obtaining knowledge of the sworn independence on January 8, 1821, by Torre Tagle (despite the exclusion of indigenous representatives from the Cabildo de Naturales and famous curacas in rural populations, such as Manuel Anselmo Carhuaguatay), he tried to introduce himself and propose that the form of government of the new Peruvian state should correspond to a descendant of Atahualpa who lived in the town, the most notorious being Don Manuel Soto Astopilco (main cacique of the Seven Huarangas of the province), in addition to suggesting the rebirth of the State of Tahuantinsuyo and its right to the crown. No news was recorded that he tried to invoke possible links with the distant and exhausted Incas of Cusco (mostly more favorable to the Royal Army of Peru).
==== Slide preparation ==== Cells from bone marrow, blood, amniotic fluid, cord blood, tumor, and tissues (including skin, umbilical cord, chorionic villi, liver, and many other organs) can be cultured using standard cell culture techniques in order to increase their number. A mitotic inhibitor (colchicine, colcemid) is then added to the culture. This stops cell division at mitosis which allows an increased yield of mitotic cells for analysis. The cells are then centrifuged and media and mitotic inhibitor are removed, and replaced with a hypotonic solution. This causes the white blood cells or fibroblasts to swell so that the chromosomes will spread when added to a slide as well as lyses the red blood cells. After the cells have been allowed to sit in hypotonic solution, Carnoy's fixative (3:1 methanol to glacial acetic acid) is added. This kills the cells and hardens the nuclei of the remaining white blood cells. The cells are generally fixed repeatedly to remove any debris or remaining red blood cells. The cell suspension is then dropped onto specimen slides. After aging the slides in an oven or waiting a few days they are ready for banding and analysis.
Sources: en.wikipedia.org
Enobosarm is a nonsteroidal SARM, acting as an agonist of the androgen receptor (AR), the biological target of androgens and anabolic steroids like testosterone and dihydrotestosterone (DHT). However, it shows dissociation of effect between tissues in preclinical studies, with agonistic and anabolic effects in muscle and bone, agonistic effects in breast, and partially agonistic or antagonistic effects in the prostate gland and seminal vesicles. The AR-mediated effects of enobosarm in many other androgen-sensitive tissues are unknown. Enobosarm was first identified in 2004 and has been under clinical development since at least 2005. It is the most well-studied SARM of all of the agents that have been developed. According to GTx, its developer, a total of 25 clinical studies have been carried out on more than 1,700 people involving doses from 1 to 100 mg as of 2020. However, enobosarm has not yet completed clinical development or been approved for any use. As of November 2023, it is in phase 3 clinical trials for the treatment of breast cancer and is in phase 2 studies for improvement of body composition in people taking GLP-1 receptor agonists. Enobosarm was developed by GTx, Inc., and is now being developed by Veru, Inc. Aside from its development as a potential pharmaceutical drug, enobosarm is on the World Anti-Doping Agency list of prohibited substances and is sold for physique- and performance-enhancing purposes by black-market Internet suppliers. In one survey, 2.7% of young male gym users reported using SARMs.
Also, the cost of purchasing and disposing of stationary phase media is eliminated. Another advantage of countercurrent chromatography is that experiments conducted in the laboratory can be scaled to industrial volumes. When gas chromatography or HPLC is carried out with large volumes, resolution is lost due to issues with surface-to-volume ratios and flow dynamics; this is avoided when both phases are liquid.
In the mid-2010s, criminal organisations were also established in southern Spain (mainly around the Costa del Sol region), but also in the rest of Europe, South America, and more recently in the United Arab Emirates. According to the Dutch investigator Pieter Tops, the Moroccan mafia gains a revenue of around €20 billion a year in the Netherlands alone (as of 2018). In September 2019, the Dutch politician Geert Wilders was trying to convince the Dutch government to launch an attack on drug traffickers. He also pleaded for a black list of the most dangerous criminal organisations that were operating on Dutch soil. This statement came right after the beheading of Nabil Amzieb, the attacks on the headquarters of Dutch news outlets De Telegraaf and Panorama, and the murders on journalist Martin Kok and lawyer Derk Wiersum, On 6 July 2021, the Dutch crime journalist Peter R. de Vries was murdered, right after he left the studio of RTL Boulevard in Amsterdam, where he had appeared as a guest on the show. De Vries died more than a week later on 15 July 2021, as a result of the shooting. It is still unclear who gave the order of the shooting, but Dutch authorities suspect the organisation of Taghi. de Vries acted as a close confidant to Nabil B., a crown witness in the Marengo trial against the organisation of Taghi, whose brother, alongside his lawyer Derk Wiersum were assassinated on the orders of Taghi's organisation.
Sources: en.wikipedia.org
In some areas food crops were eradicated to make way for opium, contributing to famines in Guizhou and Shaanxi Provinces between 1921 and 1923, and food deficits in other provinces. Beginning in 1915, Chinese nationalist groups came to describe the period of military losses and Unequal Treaties as the "Century of National Humiliation", later defined to end with the conclusion of the Chinese Civil War in 1949. In the northern provinces of Ningxia and Suiyuan in China, Chinese Muslim General Ma Fuxiang both prohibited and engaged in the opium trade. It was hoped that Ma Fuxiang would have improved the situation, since Chinese Muslims were well known for opposition to smoking opium. Ma Fuxiang officially prohibited opium and made it illegal in Ningxia, but the Guominjun reversed his policy; by 1933, people from every level of society were abusing the drug, and Ningxia was left in destitution. In 1923, an officer of the Bank of China from Baotou found out that Ma Fuxiang was assisting the drug trade in opium which helped finance his military expenses. He earned US$2 million from taxing those sales in 1923. General Ma had been using the bank, a branch of the Government of China's exchequer, to arrange for silver currency to be transported to Baotou to use it to sponsor the trade. The opium trade under the Chinese Communist Party was important to its finances in the 1940s. Peter Vladimirov's diary provided a first hand account. Chen Yung-fa provided a detailed historical account of how the opium trade was essential to the economy of Yan'an during this period.
In May 1961, messenger RNA was experimentally characterized in two back-to-back Nature papers: one by Brenner, Jacob, and Meselson, and one by Gros and colleagues (including Watson). While analyzing the data in preparation for publication, Jacob and Jacques Monod coined the term "messenger RNA".
==== Role of dopamine and glutamate ==== Dopamine is the primary neurotransmitter of the brain's reward system, and also has roles in movement, emotion, cognition and motivation. Natural rewards such as eating, and recreational drug use, both trigger dopamine release, which underlies their reinforcing quality. Excessive intake of many types of addictive drugs results in repeated release of high amounts of dopamine, which in turn affects the reward pathway directly through heightened dopamine receptor activation. Prolonged and abnormally high levels of dopamine in the synaptic cleft can induce receptor downregulation in the neural pathway. Downregulation of mesolimbic dopamine receptors can result in a decrease in the sensitivity to natural reinforcers. Drug seeking is driven by glutamatergic projections from the prefrontal cortex to the nucleus accumbens, and chronic drug exposure produces lasting glutamate-mediated changes along this route.
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist developed for research. It has not been approved as a medication in any country. It is classified as an unapproved drug and a prohibited substance in sport.
No. Cardarine is not an anabolic steroid; it belongs to a different chemical class that targets PPARδ. Steroids act primarily through androgen receptors, while cardarine acts through a nuclear receptor involved in metabolism.
Some rodent studies reported increased endurance and changes in fat metabolism after cardarine exposure. Long-term studies in animals also raised concerns about cancer in certain tissues. Human trial data are limited, so these findings cannot be directly translated to people.
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.