The short version of PPARδ fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-31 and is reviewed periodically as new material appears.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Cardarine is a synthetic compound also known as GW501516, GW-501516, and sometimes endurobol. It was developed as a selective agonist of peroxisome proliferator-activated receptor delta, a nuclear receptor involved in fatty acid oxidation and energy metabolism. The compound was studied in preclinical models for metabolic and cardiovascular conditions, but it did not become a marketed human medicine. In regulatory and anti-doping contexts, it is treated as a prohibited substance rather than a licensed medicine.
The pharmacological interest in cardarine centers on PPARδ activation and its downstream effects on lipid handling and mitochondrial function. In animal studies, PPARδ agonists have been associated with changes in exercise endurance and fatty acid utilization, though results vary by model and protocol. Human data remain sparse, and the absence of large controlled trials limits conclusions about efficacy. Researchers often describe the compound as a tool for probing PPARδ biology rather than a proven therapeutic agent.
| Property | Value | Notes |
|---|---|---|
| Primary target | PPARδ | Nuclear receptor; not androgen receptor |
| Studied indications | Dyslipidemia; obesity; diabetes | Early clinical research; development discontinued |
| Rodent toxicity | Tumor formation in multiple tissues | Dose-dependent findings in some studies |
| Human approval | None | No approved therapeutic use |
| Typical analytical method | LC-MS/MS | Used for identity and quantification |
Safety concerns emerged from long-term animal studies. In rodents given the compound for extended periods, researchers found an increased incidence of certain cancers, including liver and bladder tumors. These findings contributed to the discontinuation of clinical development. Whether similar risks apply to short-term or low-level exposure in humans is not established, and controlled human safety data are limited. The relevance of high-dose rodent carcinogenicity findings to human use remains a subject of debate.
Human trials of GW501516 were small and short in duration. They examined lipid levels, glucose handling, and other metabolic markers, but the programs were halted after the animal cancer findings. No approved therapeutic product exists, and published human data are insufficient for establishing long-term safety. Reports of use for athletic performance come mainly from non-clinical settings and cannot be verified through controlled trials. Independent testing of products sold as cardarine has found inconsistent purity and labeling.
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.
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.
In homolytic cleavage, or homolysis, the two electrons in a cleaved covalent bond are divided equally between the products. This process is also known as homolytic fission or radical fission. The bond-dissociation energy of a bond is the amount of energy required to cleave the bond homolytically. This enthalpy change is one measure of bond strength. The triplet excitation energy of a sigma bond is the energy required for homolytic dissociation, but the actual excitation energy may be higher than the bond-dissociation energy due to the repulsion between electrons in the triplet state.
Spectroscopy measures the interaction of the molecules with electromagnetic radiation. Spectroscopy consists of many different applications such as atomic absorption spectroscopy, atomic emission spectroscopy, ultraviolet-visible spectroscopy, X-ray fluorescence spectroscopy, infrared spectroscopy, Raman spectroscopy, nuclear magnetic resonance spectroscopy, photoemission spectroscopy, Mössbauer spectroscopy, and circular dichroism spectroscopy.
Christianity does not require male circumcision, with covenant theology teaching that the Christian sacrament of baptism fulfills the Israelite practice of circumcision, both being signs and seals of the covenant of grace. Most mainstream Christian denominations currently maintain a neutral position on the practice of non-religious circumcision. Male circumcision is commonly practiced in many predominantly Christian countries and many Christian communities. In the Coptic Orthodox Church, the Ethiopian Orthodox Church and the Eritrean Orthodox Tewahedo Church male circumcision is an established practice, and require that their male members undergo circumcision, and it is seen as a rite of passage. While male circumcision is widely practiced by the Druze, the procedure is practiced as a cultural tradition, and has no religious significance in the Druze faith. There is no special date for this act in the Druze faith: male Druze infants are usually circumcised shortly after birth, however some remain uncircumcised until the age of ten or older. Some Druzes do not circumcise their male children, and refuse to observe this "common Muslim practice".
Sources: en.wikipedia.org
==== Vision ==== Microbats tend to have small eyes but are still sensitive to light, and no species is truly blind. Most microbats have mesopic vision, meaning that they can detect light only in low levels, whereas other mammals have photopic vision, which allows colour vision. Microbats may use their vision for orientation and while travelling between their roosting grounds and feeding grounds, as echolocation is effective only over short distances. Megabat species generally have good eyesight and may have some colour vision to help them distinguish ripe fruits. Some species can detect ultraviolet (UV). As the bodies of some microbats have distinct colouration, they may be able to discriminate colours.
== Contraindications == Contraindications include the coadministration of terfenadine, astemizole, cisapride, pimozide, or carbamazepine. Nefazodone is contraindicated in patients who were withdrawn from nefazodone because of evident liver injury as well as those that have shown hypersensitivity to the drug, its inactive ingredients, or other phenylpiperazine antidepressants. Furthermore, the coadministration of triazolam and nefazodone should be avoided for all patients, including the elderly, since it causes a significant increase in the plasma level of triazolam and not all commercially available dosage forms of triazolam permit a sufficient dosage reduction. If coadministrated, a 75% reduction in the initial dosage of triazolam is recommended.
18 January – The BBC's Laura Kuenssberg reports that the Prime Minister has chaired a series of "mini-cabinet" meetings, along with the Chancellor, Foreign Secretary and Business Secretary, in an attempt to plan "for what might come" in terms of the effect on the UK during the Second Trump Presidency. 19 January – Foreign Secretary David Lammy tells the BBC the prime minister will visit the United States within weeks to meet incoming US president Donald Trump. Jeremy Corbyn and John McDonnell agree to be interviewed under caution by police following a pro-Palestinian rally in London. The police are investigating what they say was "a coordinated effort by organisers to breach conditions imposed on the event". 21 January – Marcus Bokkerink is dismissed as chair of the Competition and Markets Authority amid concerns the group is not focussed enough on economic growth; Doug Gurr replaces him on a temporary basis. First Minister of Wales Eluned Morgan tells the Senedd she is lobbying the UK government to give the Welsh Government powers over the Crown Estate in Wales, after a UK government minister suggested otherwise. 25 January – Sinn Féin lifts its suspension on Belfast City Councillor JJ Magee following an investigation by the Local Government Commissioner for Standards. 28 January – Labour's Stephen Timms is reprimanded for attending a Muslim Council of Britain dinner despite official government advice being to not engage with the organisation.
All high schools in Prince George's County operate with a "comprehensive" model as their base, with the exception of the Academy of Health Sciences at Prince George's Community College, which is a middle college program. All students are assigned to a high school based on an attendance area. Magnet Programs operate as a "School-Within-A-School" model, where the magnet serves as an alternative program---in addition to the main comprehensive program---and students from outside the regular attendance area of the high school are enrolled and accepted into the magnet, either through continuity (automatic continuation from a middle school magnet program to the high school level equivalent) or more commonly, through a Magnet Lottery, in which students apply for a magnet program and are granted acceptance through a random drawing. Enrollment into the Center for the Visual and Performing Arts is through audition only. Several high schools have also implemented a Smaller Learning Community model, where they offer anywhere from two or more Academy Programs, which effectively breaks a school down into several smaller schools within the school, by allowing students to essentially declare a major (such as a student attending a college or university) through career academies such as "Arts, Media, and Communication" or the "National Academy of Finance," for example. All high schools within PGCPS operate on a staggered school day schedule, where some high schools start as early as 7:45am and end as early as 2:25pm, and other high schools start as late as 9:30am and end as late as 4:10pm.
Sources: en.wikipedia.org
It targets PPARδ, a nuclear receptor involved in lipid and energy metabolism. It does not act primarily on androgen receptors. This distinction separates it from SARMs.
Rodent studies found dose-dependent tumors in several organs. The sponsor discontinued the program over cancer concerns. Human risk from long-term use remains unknown.
Controlled human endurance trials are lacking. Animal studies show increased exercise capacity under some conditions. Anecdotal reports are not equivalent to clinical evidence.
Cardarine is an investigational synthetic compound that acts as a PPARδ agonist. It is also known as GW501516 and has been studied mainly in preclinical research. It is not an approved medicine.