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 2025-09-23 and is reviewed periodically as new material appears.
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.
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.
Anti-doping laboratories identify GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the usual matrix, and detection can occur after the parent compound has cleared from blood. The exact detection window depends on dose, formulation, individual metabolism, and assay sensitivity. Because the compound is prohibited at all times, athletes are subject to testing in and out of competition. Analytical methods continue to improve as new metabolites and designer analogs are characterized.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Visual description for typical solid reference material. |
| Solubility | Poorly soluble in water; soluble in DMSO | Solubility depends on solvent, purity, and form. |
| Storage | Cool, dry, protected from light | Long-term storage often uses low temperature and desiccant. |
| Common analytical method | LC-MS/MS | Used for detection and quantification in biological matrices. |
| Common synonyms | GW-501516; GW501516; endurobol | Naming varies among literature, vendors, and databases. |
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.
Laboratory handling focuses on identity, purity, and stability. Reference standards are typically stored cold and dry, protected from light, because solutions can degrade over time. Analytical checks may use high-performance liquid chromatography with ultraviolet detection or mass spectrometry. Impurities and related substances can be separated chromatographically and compared with a known standard. Because cardarine is not an approved drug, compendial monographs are absent, and laboratories often rely on in-house methods. Reported purity varies among unregulated products and should not be assumed from a label.
Legal status varies by country. In some places, cardarine is controlled under medicines or psychoactive substances laws; in others, it may be sold with minimal oversight as a research chemical. Customs agencies have intercepted shipments, and several national health agencies have issued warnings about products marketed for bodybuilding or performance enhancement. The lack of a standardized pharmaceutical supply means identity, purity, and contamination levels can differ widely between samples. These factors make cardarine a regulatory and public health concern rather than a conventional prescription drug.
Cardarine is a common name for GW501516, a synthetic compound first described in the 1990s as a selective agonist of the peroxisome proliferator-activated receptor delta. It was studied in preclinical models for metabolic and cardiovascular conditions, but it has not been approved as a medicine in the United States, Europe, or other major jurisdictions. Retail products labeled as cardarine are generally research chemicals or supplements, not pharmaceutical formulations. Because human safety and efficacy data remain limited, regulatory agencies treat it as an unapproved substance rather than a therapeutic product.
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.
== Background == The match was a repeat of the 1973 final, making it the fourth repeated final pairing. Ajax won the 1973 final 1–0. Ajax was defending the title, having won in 1995 when they defeated Milan 1–0. Juventus had not featured in the Champions League for nine years until this edition of the tournament. Juventus reached their fourth final. In the semi-finals, Juventus eliminated French side Nantes, with a 2-0 victory in the first leg at home, and 3–2 defeat in the return leg. Previously Juventus won the final in 1985, and lost in 1973 and 1983. Ajax reached their sixth final. In the semi-finals, Ajax eliminated Greek side Panathinaikos; they lost the first leg 1–0 at home, but won 3–0 in the second leg. Previously Ajax won the finals in 1971, 1972, 1973 and 1995, and lost in 1969. Juventus entered the final as 1995–96 Serie A runners-up to Milan, as well as 1995 Supercoppa Italiana winners. Ajax entered the final as 1995–96 Eredivisie champions, 1995 Dutch Supercup winners, 1995 UEFA Super Cup and 1995 Intercontinental Cup winners.
If references are made, the Court of Justice will give a preliminary ruling, in order for the member state court to conclude the case and award a remedy. The right to an effective remedy is a general principle of EU law, enshrined in the Charter of Fundamental Rights article 47. Most of the time Regulations and Directives will set out the relevant remedies to be awarded, or they will be construed from the legislation according to the practices of the member state. It could also be that the government is responsible for failure to properly implement a Directive or Regulation, and must therefore pay damages. In Francovich v Italy, the Italian government had failed to set up an insurance fund for employees to claim unpaid wages if their employers had gone insolvent, as the Insolvency Protection Directive required. Francovich, the former employee of a bankrupt Venetian firm, was therefore allowed to claim 6 million Lira from the Italian government in damages for his loss. The Court of Justice held that if a Directive would confer identifiable rights on individuals, and there is a causal link between a member state's violation of EU and a claimant's loss, damages must be paid. The fact that the incompatible law is an Act of Parliament is no defence. So, in Factortame it was irrelevant that Parliament had legislated to require a quota of British ownership of fishing vessels in primary legislation.
Ethologist Jonathan Balcombe stated that female bonobos rub their clitorises together rapidly for ten to twenty seconds, and this behavior, "which may be repeated in rapid succession, is usually accompanied by grinding, shrieking, and clitoral engorgement"; he added that, on average, they engage in this practice "about once every two hours", and as bonobos sometimes mate face-to-face, "evolutionary biologist Marlene Zuk has suggested that the position of the clitoris in bonobos and some other primates has evolved to maximize stimulation during sexual intercourse". Many strepsirrhine species exhibit elongated clitorises that are either fully or partially tunneled by the urethra, including mouse lemurs, dwarf lemurs, all Eulemur species, lorises and galagos. Some of these species also exhibit a membrane seal across the vagina that closes the vaginal opening during the non-mating seasons, most notably mouse and dwarf lemurs. The clitoral morphology of the ring-tailed lemur is the most well-studied. They are described as having "elongated, pendulous clitorises that are [fully] tunneled by a urethra". The urethra is surrounded by erectile tissue, which allows for significant swelling during breeding seasons, but this erectile tissue differs from the typical male corpus spongiosum. Non-pregnant adult ring-tailed females do not show higher testosterone levels than males, but they do exhibit higher A4 and estrogen levels during seasonal aggression. During pregnancy, estrogen, A4, and testosterone levels are raised, but female fetuses are still "protected" from excess testosterone.
A polycyclic aromatic hydrocarbon (PAH) is any member of a class of organic compounds that is composed of multiple fused aromatic rings. Most are produced by the incomplete combustion of organic matter—by engine exhaust fumes, tobacco, incinerators, in roasted meats and cereals, or when biomass burns at lower temperatures as in forest fires. The simplest representative is naphthalene, having two aromatic rings, and the three-ring compounds anthracene and phenanthrene. PAHs are uncharged, non-polar and planar. Many are colorless. Many of them are also found in fossil fuel deposits such as coal and in petroleum. Exposure to PAHs can lead to different types of cancer, fetal development complications, and cardiovascular issues. Polycyclic aromatic hydrocarbons are discussed as possible starting materials for abiotic syntheses of materials required by the earliest forms of life.
== Function and mechanism == An amino acid contains an amino (NH2) group. A keto acid contains a keto (=O) group. In transamination, the NH2 group on one molecule is exchanged with the =O group on the other molecule. The amino acid becomes a keto acid, and the keto acid becomes an amino acid. Transaminases require the coenzyme pyridoxal phosphate, which is converted into pyridoxamine in the first half-reaction, when an amino acid is converted into a keto acid. Enzyme-bound pyridoxamine in turn reacts with pyruvate, oxaloacetate, or alpha-ketoglutarate, giving alanine, aspartic acid, or glutamic acid, respectively. Many transamination reactions occur in tissues, catalysed by transaminases specific for a particular amino/keto acid pair. The reactions are readily reversible, the direction being determined by which of the reactants are in excess. This reversibility can be exploited for synthetic chemistry applications to achieve the synthesis of valuable chiral amines. The specific enzymes are named from one of the reactant pairs, for example; the reaction between glutamic acid and pyruvic acid to make alpha ketoglutaric acid and alanine is called alanine transaminase and was originally called glutamic-pyruvic transaminase or GPT for short.
Sources: en.wikipedia.org
=== Passport validity length === Very few countries, such as Paraguay, just require a valid passport on arrival. However many countries and groupings now require only an identity card – especially from their neighbours. Other countries may have special bilateral arrangements that depart from the generality of their passport validity length policies to shorten the period of passport validity required for each other's citizens or even accept passports that have already expired (but not been cancelled). Some countries, such as Japan, Ireland and the United Kingdom, require a passport valid throughout the period of the intended stay. In the absence of specific bilateral agreements, countries requiring passports to be valid for at least 6 more months on arrival include Afghanistan, Algeria, Anguilla, Bahrain, Bhutan, Botswana, British Virgin Islands, Brunei, Cambodia, Cameroon, Cape Verde, Cayman Islands, Central African Republic, Chad, Comoros, Costa Rica, Côte d'Ivoire, Curaçao, Ecuador, Egypt, El Salvador, Equatorial Guinea, Fiji, Gabon, Guinea Bissau, Guyana, Haiti, India, Indonesia, Iran, Iraq, Israel, Jordan, Kenya, Kiribati, Kuwait, Laos, Madagascar, Malaysia, Marshall Islands, Mongolia, Myanmar, Namibia, Nepal, Nicaragua, Nigeria, Oman, Palau, Papua New Guinea, Peru, Philippines, Qatar, Rwanda, Samoa, Saudi Arabia, Singapore, Solomon Islands, Somalia, Sri Lanka, Sudan, Suriname, Tanzania, Thailand, Timor-Leste, Tokelau, Tonga, Turkey, Tuvalu, Uganda, United Arab Emirates, Vanuatu, Venezuela, and Vietnam.
=== Harness with buoyancy compensation === The AP Valves Mk4 Jump Jacket is a harness with integral buoyancy jacket specifically designed for commercial diving work with helmets and bells. There is a direct feed to the jacket from the main air supply, via the helmet side-manifold block, from the pneumo line and from bailout, and a system which allows the diver's pneumo to be directly connected to another diver's helmet as an emergency air supply. The harness supports a single or twin cylinder bailout set, allows buoyancy control from slightly negative through neutral, to sightly positive, and has a safety harness for retaining the helmet.The Jump Jacket also serves as a recovery harness for rescues to the bell, and has front and back lifting points.
=== Biological strategies === It has become possible to accelerate natural aerobic, anaerobic, and sequential aerobic and/or anaerobic biological processes to minimize the presence of NAPLs in the subsurface environment. Most bioremediation strategies rely on the presence of specific populations of bacteria/microorganisms and the addition of organic carbon to stimulate biodegradation. This organic carbon can be supplied via injection of soluble organic carbon sources such as lactate, alcohols, cheese whey, etc. and placement of slow-release electron donors such as vegetable oil and soybean oil emulsions. Sufficient dissolved oxygen must be present for aerobic biodegradation, which can be supplied through strategies including air sparging and SVE. That said, the ability to supply sufficient oxygen is a limiting factor affecting the success of this type of remediation strategy. Also, many cases require the presence of inducers such as methane, propane, ammonia, or toluene, which are contaminants in and of themselves that are inherently harmful to the subsurface environment. Yet another challenge is maintaining a sufficient population of bacteria/microorganisms in the face of competition from native bacteria and other external pressures. There is also regulatory pushback to the use of genetically modified bacteria. Furthermore, NAPLs may not be readily bioavailable, limiting the effectiveness of biodegradation strategies. In this sense, biodegradation may not be appropriate as a single solution, but it can certainly be used in conjunction with other strategies.
Fripp was dissatisfied with the quality of the new music being developed by the band, and longstanding friction between himself and Bruford resurfaced. The resulting atmosphere and the lack of workable material almost broke the band up altogether. Instead, the six members opted to work in four smaller groups (or "fraKctalisations", as Fripp called them) known as ProjeKcts. This enabled the group to continue developing ideas and searching for a new direction without the practical difficulty and expense of convening all six musicians at once. From late 1997 to early 1999, ProjeKct One (Fripp, Bruford, Levin, Gunn), ProjeKct Two (Fripp, Belew, Gunn), ProjeKct Three (Fripp, Gunn, Mastelotto), and ProjeKct Four (Fripp, Levin, Gunn, Mastelotto) played live in the United States and the United Kingdom, with recordings from these performances released on The ProjeKcts box set in 1999. These largely-improvised recordings, along with ProjeKct Two's 1998 studio album Space Groove, showed influences including jazz, industrial, techno and drum and bass. Music critic J. D. Considine considered the ProjeKcts' work "frequently astonishing" but lacking in melody. The four live performances of ProjeKct One in December 1997 would be Bruford's last involvement with King Crimson.
Sources: en.wikipedia.org
=== Wound repair === As a major component of the extracellular matrix, hyaluronic acid has a key role in tissue regeneration, inflammation response, and angiogenesis, which are phases of wound repair. As of 2023, however, reviews of its effect on healing for chronic wounds including burns, diabetic foot ulcers or surgical skin repairs show either insufficient evidence or only limited positive clinical research evidence. There is also some limited evidence to suggest that hyaluronic acid may be beneficial for ulcer healing and may help to a small degree with pain control. Hyaluronic acid combines with water and swells to form a gel, making it useful in skin treatments as a dermal filler for facial wrinkles; its effect lasts for about 6 to 12 months, and treatment has regulatory approval from the US Food and Drug Administration.
=== United States === Ochoa then went to the United States, where he again held many positions at several universities. Between 1940 and 1942, Ochoa worked for Washington University's School of Medicine. In 1942 he was appointed research associate in medicine at the New York University School of Medicine and there subsequently became assistant professor of biochemistry (1945), professor of pharmacology (1946), professor of biochemistry (1954), and chair of the department of biochemistry. In 1956, he became an American citizen. He was elected to both the United States National Academy of Sciences and the American Academy of Arts and Sciences in 1957. In 1959, Ochoa and Arthur Kornberg were awarded the Nobel Prize for Physiology or Medicine "for their discovery of the mechanisms in the biological synthesis of ribonucleic acid and deoxyribonucleic acid". He was elected to the American Philosophical Society in 1961. Ochoa continued research on protein synthesis and replication of RNA viruses until 1985, when he returned to now democratic Spain where he was a science advisor. Ochoa was also a recipient of U.S. National Medal of Science in 1978. Severo Ochoa died in Madrid, Spain on 1 November 1993. Carmen García Cobián had died in 1986. Long after his death, Spanish actress Sara Montiel claimed that she and Severo Ochoa were involved in a romantic relationship in the 1950s, as stated in an interview in Spanish newspaper El País: "The great love of my life was Severo Ochoa. But it was an impossible love. Clandestine.
== See also == Upper Voltan Territorial Assembly election, 1957 List of French possessions and colonies French colonial empire French West Africa Heads of state of Burkina Faso Heads of government of Burkina Faso
Principal cells: columnar cells that, with the basal cells, form the majority of the epithelium. In the caput (head) region, these cells have long stereocilia that are tuft-like extensions that project into the lumen. The stereocilia are much shorter in the cauda (tail) segment. They also secrete carnitine, sialic acid, glycoproteins, and glycerylphosphorylcholine into the lumen. Basal cells: shorter, pyramid-shaped cells, which contact the basal lamina but taper off before their apical surfaces reach the lumen. These are thought to be undifferentiated precursors of principal cells. Apical cells: predominantly found in the head region Clear cells: predominant in the tail region Intraepithelial lymphocytes: distributed throughout the tissue. Intraepithelial macrophages
There was low- to moderate-strength evidence of no benefit for most of the other medications used in RCTs, which included antidepressants (bupropion, mirtazapine, sertraline), antipsychotics (aripiprazole), anticonvulsants (topiramate, baclofen, gabapentin), naltrexone, varenicline, citicoline, ondansetron, prometa, riluzole, atomoxetine, dextroamphetamine, and modafinil.
Sources: en.wikipedia.org
Cardarine targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not bind the androgen receptor in the way SARMs do.
Most methods use liquid chromatography with tandem mass spectrometry. Urine is common in anti-doping testing, and blood or plasma may be used in research.
Typical guidance is cool, dry, dark storage, often at low temperature and with desiccant. Stability data are limited, so storage conditions should be verified for each batch or supplier.
It binds to and activates PPAR delta, a nuclear receptor that controls expression of genes related to fatty acid oxidation. This mechanism can alter energy metabolism in animal models. It is not a direct stimulant or fat-burning enzyme.