Nuclear receptor comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2025-11-02. Where a claim depends on a specific study, the study is described rather than over-claimed.
Published studies have examined GW501516 in animal models of obesity, insulin resistance, and exercise endurance. Early human trials reportedly ended, and development was discontinued after preclinical findings raised concerns about cancer in some rodent studies. Regulatory agencies have not approved cardarine for any medical use. Its availability through non-pharmaceutical channels raises questions about identity, purity, and legal status that are separate from its laboratory pharmacology. Those questions are often addressed through analytical testing rather than assumptions about product labels.
Cardarine is a common name for GW501516, also GW-1516, a synthetic compound developed as a peroxisome proliferator-activated receptor delta (PPARδ) agonist. It belongs to a class of agents that modulate gene transcription related to lipid and energy metabolism. The compound was studied in preclinical and early clinical research for metabolic and cardiovascular conditions, but it did not progress to approved therapeutic use. Its name appears in fitness and sports contexts despite not being approved as a drug.
PPARδ is a nuclear receptor that influences transcription of genes involved in fatty acid oxidation, lipid transport, and energy homeostasis. GW501516 binds and activates this receptor with high selectivity relative to PPARα and PPARγ in laboratory assays. Activation alters expression of target genes in skeletal muscle, liver, and adipose tissue in animal models. The exact clinical consequences of these changes in humans remain incompletely characterized, and observed effects in animals do not establish therapeutic benefit or safety.
Laboratory studies have examined GW501516 in cell cultures and rodents for conditions such as dyslipidemia, insulin resistance, and obesity. Some trials in humans were initiated, but development was discontinued after preclinical findings raised concerns about cancer in certain models. Those findings do not prove that the compound causes cancer in people, but they contributed to regulatory caution. Later reviews often describe the evidence as preliminary and insufficient for assessing long-term safety.
In the fitness and bodybuilding literature, cardarine is frequently discussed as an endurance agent or fat-loss compound, although such claims are not supported by robust clinical evidence. Online descriptions often mix animal data, user anecdotes, and marketing language. Researchers who study PPARδ agonists distinguish between receptor activation in controlled experiments and unsupervised use of unverified products. The latter introduces unknown purity, dose, and interactions, making reported experiences difficult to interpret scientifically.
| Property | Value | Notes |
|---|---|---|
| Chemical class | PPARδ agonist | Not an anabolic steroid. |
| Common synonyms | GW501516, GW-1516 | Cardarine is an informal name. |
| Appearance | White to off-white powder | Typical for research-grade solid. |
| Solubility class | Poorly soluble in water; soluble in some organic solvents | Such as DMSO or ethanol in laboratory settings. |
| Typical storage temperature | Cool, dry, protected from light | Specific conditions vary by supplier and form. |
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.
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.
Laboratory studies indicate that GW501516 activates PPARδ, a nuclear receptor involved in fatty acid oxidation and energy metabolism. In rodent experiments, treated animals often showed increased endurance and reduced fat mass. These effects were observed under controlled conditions and do not establish safe or effective use in humans. The exact dose-response relationship in humans remains poorly characterized. Species differences in metabolism can affect how results translate across animals and people.
== Distinction between a LIMS and a LIS == Until recently, the LIMS and Laboratory Information System (LIS) have exhibited a few key differences, making them noticeably separate entities. A LIMS traditionally has been designed to process and report data related to batches of samples from biology labs, water treatment facilities, drug trials, and other entities that handle complex batches of data. A LIS has been designed primarily for processing and reporting data related to individual patients in a clinical setting. A LIMS may need to satisfy good manufacturing practice (GMP) and meet the reporting and audit needs of the regulatory bodies and research scientists in many different industries. A LIS, however, must satisfy the reporting and auditing needs of health service agencies e.g. the hospital accreditation agency, HIPAA in the US, or other clinical medical practitioners. A LIMS is most competitive in group-centric settings (dealing with "batches" and "samples") that often deal with mostly anonymous research-specific laboratory data, whereas a LIS is usually most competitive in patient-centric settings (dealing with "subjects" and "specimens") and clinical labs. An LIS is regulated as a medical device by the FDA, and the companies that produce the software are therefore liable for defects. Due to this, a LIS can not be customized by the client.
== Medical uses == Trimipramine's primary use in medicine is in the treatment of major depressive disorder, especially where sedation is helpful due to its prominent sedative effects. The drug is also an effective anxiolytic, and can be used in the treatment of anxiety. In addition to depression and anxiety, trimipramine is effective in the treatment of insomnia, and unlike most other hypnotics, does not alter the normal sleep architecture. In particular, it does not suppress REM sleep, and dreams are said to "brighten" during treatment. Trimipramine also has some weak antipsychotic effects with a profile of activity described as similar to that of clozapine, and may be useful in the treatment of psychotic symptoms, such as in delusional depression, schizoaffective disorder or schizophrenia. A major systematic review and network meta-analysis of medications for the treatment of insomnia published in 2022 found that trimipramine had an effect size (standardized mean difference (SMD)) against placebo for treatment of insomnia at 4 weeks of 0.55 (95% CITooltip confidence interval –0.11 to 1.21). The certainty of evidence was rated as very low, and no data were available for longer-term treatment (3 months). For comparison, the other sedating antihistamines assessed, doxepin and doxylamine, had effect sizes (SMD) at 4 weeks of 0.30 (95% CI –0.05 to 0.64) (very low certainty evidence) and 0.47 (95% CI 0.06 to 0.89) (moderate certainty evidence), respectively. The effective dosage of trimipramine in depression is 150 to 300 mg/day.
Carbohydrate antigens on the surface of cells can be used as targets for immunotherapy. GD2 is a ganglioside found on the surface of many types of cancer cell including neuroblastoma, retinoblastoma, melanoma, small cell lung cancer, brain tumors, osteosarcoma, rhabdomyosarcoma, Ewing's sarcoma, liposarcoma, fibrosarcoma, leiomyosarcoma and other soft tissue sarcomas. It is not usually expressed on the surface of normal tissues, making it a good target for immunotherapy. As of 2014, clinical trials were underway.
Once this was finished, the riggers carefully made their way across the hanging cables, tying the foot-ropes together and connecting the handrails and the foot-ropes with the remainder of the thin grass ropes. Not all rope bridges were exactly alike in terms of design and build. Some riggers also wove pieces of wood into the foot-ropes. Modern-day rope bridge builders in Huinchiri, Peru make offerings to Pacha Mama, otherwise known as "Mother Earth," throughout their building process to ensure that the bridge will be strong and safe. This may have been a practice used by the Inca people since they too were religious. If all went smoothly and if tasks were performed in a timely fashion, a bridge had the potential of being constructed in three days.
Sources: en.wikipedia.org
A common issue with animal vaccination is that it interferes with immunological tests as both infection and vaccination can result in antibodies against an antigen being made. To solve this issue, special marker vaccines are created using pathogen strains carrying at least one epitope less than the equivalent wild microorganism. An accompanying diagnostic test that detects the antibody against that epitope assists in identifying whether the animal has been vaccinated or not. They are also called "DIVA vaccines". The first marker vaccines and companion diagnostic tests were developed by J. T. van Oirschot and colleagues at the Central Veterinary Institute in Lelystad, The Netherlands. They found that some existing vaccines against pseudorabies (also termed Aujeszky's disease) had deletions in their viral genome (among which was the gE gene). Monoclonal antibodies were produced against that deletion and selected to develop an ELISA that demonstrated antibodies against gE. In addition, novel genetically engineered gE-negative vaccines were constructed. Along the same lines, DIVA vaccines and companion diagnostic tests against bovine herpesvirus 1 infections have been developed. The DIVA strategy has been applied in various countries to successfully eradicate pseudorabies virus from those countries. Swine populations were intensively vaccinated and monitored by the companion diagnostic test and, subsequently, the infected pigs were removed from the population. Bovine herpesvirus 1 DIVA vaccines are widely used in European BoHV-1 control and eradication programmes.
== Honors and awards == 2010 American Chemical Society The Delaware Section Award 2015 Dupont Pederson Medal 2016 the Analytical Scientist The Power List 2016 Top 50 most influential women 2020 Eastern Analytical Symposium (EAS) Award for Outstanding Achievements in Mass Spectrometry
=== Awards === Half-Life 2 earned 39 Game of the Year awards, including Overall Game of the Year at IGN, GameSpot's Award for Best Shooter, GameSpot's Reader's Choice — PC Game of the Year Award, "Game of the Year" and "Computer Game of the Year" from the Interactive Achievement Awards, and "Best Game" with the Game Developers Choice Awards, where it was also given various awards for technology, characters, and writing. The editors of Computer Gaming World nominated Half-Life 2 for their 2004 "Single-Player Shooter of the Year" and overall "Game of the Year" awards, although it lost to Painkiller and World of Warcraft. They wrote, "Half-Life 2, everyone's default pick to win this year, is indeed a fantastic roller coaster of a ride, not as great as the original but still leagues above most other shooters." Edge gave Half-Life 2 its top honor of the year with the award for Best Game, as well as awards for Innovation and Visual Design. It also had a strong showing at the 2004 British Academy Video Games Awards, picking up six awards, more than any other game that night, with awards including "Best Game" and "Best Online and Multiplayer". Computer Games Magazine named Half-Life 2 the fourth-best computer game of 2004 and gave it the awards for "Best Technology" (beating Doom 3) and "Best Writing", and runner-up awards for "Best Sound Effects", "Best AI" and "Best Voice Acting". The editors called it "a masterful single-player experience that plays a constant game of one-upmanship with itself".
Behavioral endocrinology is a branch of endocrinology that studies the Neuroendocrine system and its effects on behavior. Behavioral endocrinology studies the biological mechanisms that produce behaviors, this gives insight into the evolutionary past. The field has roots in ethology, endocrinology and psychology.
== In popular culture == A fictionalized version of the Black Dragon Society "featured in much of American popular culture". It appeared in Master Comics starting with issue 21, first published by Fawcett Comics on December 10, 1941. Initially displayed as an external threat, the Black Dragon Society was given elements of a fifth column after the attack on Pearl Harbor, which reflected the fear of subversion of American society by Japanese-Americans. In DC's All Star Comics from 1942 the Society functioned as an opponent of the Justice Society of America and were likewise presented as an example of "alleged Japanese American perfidy". Another fictionalized version of the Black Dragon Society is featured in the CBS television series Raven, where they are a ninja clan operating in Hawaii.
Sources: en.wikipedia.org
=== Salinization/acidification of soils === Sediment from abandoned aquaculture farms can remain hypersaline, acidic and eroded. This material can remain unusable for aquaculture purposes for long periods thereafter. Various chemical treatments, such as adding lime, can aggravate the problem by modifying the physicochemical characteristics of the sediment.
== Target == GsMTx-4 mainly targets mechanosensitive channels from the Piezo and TRP families, such as Piezo1 and TRPC6 which are generally bilayer tension-sensitive. This corresponds to the strong bilayer partitioning energy of GsMTx-4. It also targets a spectrum of voltage-dependent sodium channels (human Nav1.1- Nav1.7), human ERG channels (Kv11.1 and Kv11.2), and acetylcholine receptors.
Eicosanoids include prostaglandins that produce fever and the dilation of blood vessels associated with inflammation and leukotrienes that attract certain white blood cells (leukocytes). Common cytokines include interleukins that are responsible for communication between white blood cells; chemokines that promote chemotaxis; and interferons that have antiviral effects, such as shutting down protein synthesis in the host cell. Growth factors and cytotoxic factors may also be released. These chemicals recruit immune cells to the site of infection and promote the healing of any damaged tissue following the removal of pathogens.
Sub-ppb (parts per billion) levels of silica make it equally complex for both reactive and total silica analysis, making the choice of total silica test often preferred. Although particles and TOC are usually measured using on-line methods, there is significant value in complementary or alternative off-line lab analysis. The value of the lab analysis has two aspects: cost and speciation. Smaller UPW facilities that cannot afford to purchase on-line instrumentation often choose off-line testing. TOC can be measured in the grab sample at a concentration as low as 5 ppb, using the same technique employed for the on-line analysis (see on-line method description). This detection level covers the majority of needs of less critical electronic and all pharmaceutical applications. When speciation of the organics is required for troubleshooting or design purposes, liquid chromatography-organic carbon detection (LC-OCD) provides an effective analysis. This method allows for identification of biopolymers, humics, low molecular weight acids and neutrals, and more, while characterizing nearly 100% of the organic composition in UPW with sub-ppb level of TOC. Similar to TOC, SEM particle analysis represents a lower cost alternative to the expensive online measurements and therefore it is commonly a method of choice in less critical applications. SEM analysis can provide particle counting for particle size down to 50 nm, which generally is in-line with the capability of online instruments.
At the 2015 China Victory Day Parade, Xi announced a reduction of 300,000 troops from the PLA, bringing its size to 2 million troops. Xi described this as a gesture of peace, while analysts have said that the cut was done to reduce costs as well as to modernize the PLA. In November 2015, the Central Leading Group for Military Reform announced extensive reforms in the PLA called Deepening National Defense and Military Reform. In 2016, Xi reduced the number of theater commands of the PLA from seven to five. He also abolished the four autonomous general departments of the PLA, replacing them with 15 agencies directly reporting to the CMC. Two new branches of the PLA were created under his reforms, the Strategic Support Force and the Joint Logistics Support Force. PLA Second Artillery Corps was upgraded to the PLA Rocket Force. In March 2016, the CMC announced the abolishment of paid services by the PLA and the People's Armed Police (PAP) by 2019, meaning activities like military-run hospitals and hotels open to the public. On 21 April 2016, Xi was named commander-in-chief of the country's new CMC Joint Operations Command Center. In 2018, the PAP was placed under the sole control of the CMC; it was previously under the joint command of the CMC and the State Council through the Ministry of Public Security. The PLA went through further extensive reforms in 2024; the Strategic Support Force was dissolved and the Aerospace Force, the Cyberspace Force and the Information Support Force was established as arms of the PLA, joining the Joint Logistics Support Force.
Sources: en.wikipedia.org
Cardarine is commonly known as GW501516 or GW-1516. These names refer to the same synthetic compound. It is not a brand-name approved medicine.
No, cardarine is not a steroid. It is classified as a PPARδ agonist. Its structure and receptor target differ from anabolic steroids.
No regulatory agency has approved cardarine as a medicine. It was investigated in early research but development was discontinued. It is not available as a prescription drug.
It binds and activates PPARδ, a nuclear receptor that influences gene expression related to fatty acid metabolism and energy balance. This mechanism has been studied mainly in animals and cell models, not established as a safe human therapy.