Everything below concerns fatty acid oxidation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-10-20. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
Safety discussions about cardarine frequently cite rodent carcinogenicity findings reported in the 2000s. In those studies, treated animals developed tumors at multiple sites, leading sponsors to discontinue clinical development. The relevance of these findings to humans has not been resolved, but they are a major reason the compound is not approved. Current literature emphasizes uncertainty about long-term effects and the risks of unregulated use. Regulators and health agencies have not established a safe human exposure level.
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.
| Property | Value | Notes |
|---|---|---|
| Molecular target | PPAR delta (NR1C2) | Ligand-activated nuclear receptor. |
| Primary tissues studied | Skeletal muscle, liver, adipose | Effects on fatty acid oxidation and energy use. |
| Typical detection matrix | Urine | Used in anti-doping analysis. |
| Common analytical method | LC-MS/MS | Detects parent compound and metabolites. |
| Sport regulatory class | Prohibited at all times | Listed as a metabolic modulator by WADA. |
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.
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.
Regulatory bodies treat GW501516 as a prohibited substance in competitive sport. The World Anti-Doping Agency added it to the prohibited list, and it falls under classes covering metabolic modulators and hormone-related agents. It is not approved by drug regulators for human use, and it is not a lawful dietary supplement. Products sold under the cardarine name may contain unlisted ingredients or different compounds. Because no approved product exists, quality and identity are not guaranteed by pharmaceutical manufacturing standards.
Cardarine is a common name for the investigational chemical GW501516, also written GW-1516. It was developed as a peroxisome proliferator-activated receptor delta agonist for metabolic conditions such as dyslipidemia. Early research focused on lipid handling and energy use in skeletal muscle and other tissues. The compound was never approved as a medicine. In public discussion, it is often grouped with performance-enhancing substances, although its receptor target differs from that of anabolic steroids or selective androgen receptor modulators. Regulatory and health authorities have issued warnings about its use.
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.
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.
Products sold as cardarine have been found to contain incorrect compounds, variable amounts, or no active ingredient at all. Independent testing is required to verify identity and purity. Common analytical approaches include high-performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance for structural confirmation. These methods can distinguish GW501516 from related PPAR agonists and from unrelated steroids. For regulators and researchers, such verification is central to interpreting both biological results and adverse event reports.
Cardarine is prohibited in competitive sport under the World Anti-Doping Agency code, where it is classified as a metabolic modulator. It is not approved as a prescription medicine in the United States, European Union, or other major markets. Regulatory action has focused on its presence in sports and in products marketed as research chemicals. Because it has no accepted medical indication, supply is often unregulated. This status creates legal and safety uncertainties for anyone who encounters the substance.
Anti-doping laboratories detect GW501516 and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is the most common matrix, though blood and dried blood spots may also be used in some programs. Detection depends on factors such as dose, timing, metabolism, and the sensitivity of the assay. Published methods describe limits of detection in the low nanogram per milliliter range for related compounds. Exact detection windows are not fixed for all situations and remain an area of ongoing study.
In severe IRIS, symptoms may cause permanent disability or death. Management again includes antimicrobial treatments against the underlying infection. Corticosteroids are the most commonly used intervention in these cases as they work to suppress the inflammatory response seen in IRIS, though there is limited research on their efficacy. Guidelines recommend a risk/benefit analysis prior to starting corticosteroids, especially taking into consideration the patient's comorbidities. Common adverse effects of corticosteroids are hyperglycemia, hypertension, mental status changes, worsening of an existing infection, and increased risk of a new infection. Important exceptions include cases of Cryptococcal-IRIS with worsening meningitis symptoms (cranial nerve defects, hearing or vision changes) and cases of Kaposi's sarcoma. In these cases, corticosteroids should not be used as they have been shown to worsen outcomes. It is recommended to continue ART except in the most severe cases of IRIS. Discontinuing ART may be considered in life-threatening cases of IRIS not improved by corticosteroids, usually in central nervous system-associated IRIS. Stopping ART increases the risk of acquiring new OI and developing IRIS again when restarting ART.
Before refilling with the same solution, the syringe needle should be externally rinsed and dried with lint-free paper, without the need for an internal wash. However, when switching to a different reagent or concentration, the syringe must be thoroughly washed, flushed with ethanol or methanol, and carefully dried under vacuum-using a ThermoVac for VP-ITC or the integrated vacuum systems in other models. The sample cell should be emptied using the loading syringe and rinsed multiple times with water.
=== Primary cold agglutinin disease === In single-center series, primary CAD has been found to account for 13–15% of the cases of AIHA. In a population-based clinical study of primary CAD in Norway, the prevalence was found to be 16 per million in habitants and the incidence rate 1 per million inhabitants per year. Little is known about possible geographic variations. Median age of CAD patients was 76 years and median age at onset of symptoms was approximately 67 years. The male/female ratio has been reported to be 0.5–0.6 which is not very different from a male/female ratio of 0.72 in an age-matched general population. The frequency of auto-immune disorders other than CAD does probably not differ from what is to be expected in an elderly population with some female predominance. as about 12.5 years from diagnosis and median age at death was 82 years, which implies a life expectancy in these patients similar to that of an age-matched general population. More than 90% of patients with primary CAD have Cold-induced circulatory symptoms ranging from moderate acrocyanosis to severe Raynaud phenomena precipitated even by very slight cold exposure.
A comprehensive list of copper alloy surface products that have been granted antimicrobial registration status with public health claims by the EPA can be found here: Antimicrobial copper-alloy touch surfaces#Approved products. Clinical trials are currently being conducted on microbial strains unique to individual healthcare facilities worldwide to evaluate to what extent copper alloys can reduce the incidence of infection in hospital environments. Early results disclosed in 2011 from clinical studies funded by the U.S. Department of Defense that are taking place at intensive care units (ICUs) at Memorial Sloan-Kettering Cancer Center in New York City, the Medical University of South Carolina, and the Ralph H. Johnson VA Medical Center in Charleston, South Carolina, indicate that rooms where common touch surfaces were replaced with copper demonstrated a 97% reduction in surface pathogens versus the non-coppered rooms and that patients in the coppered ICU rooms had a 40.4% lower risk of contracting a hospital acquired infection versus patients in non-coppered ICU rooms.
Due caution needs to be exercised – this includes appropriate personnel protective equipment (PPE) such as a flotation device, adequate training and working in pairs. To further optimize safety, equipment and accessories should include: two-way radios, amphibious vehicles, winch on wheeled vehicles. Ice thickness may be measured with ice augers, at required distance intervals or using a ground-penetrating radar (GPR). This is important, since an ice cover can vary as much as 70% in thickness over a few hundred meters, and the minimum ice thickness is used to determine the bearing capacity of the entire ice cover. Borehole drilling may be used to collect cores of the ice, so as to appreciate its internal structure, e.g. white ice versus clear ice. Snow cover removal is the first major operation in an ice road construction scheme. It may only begin once the ice thickness is safe to support the machinery used for that operation. There are two ways of doing it, depending on available equipment and state of practice for that particular road. One is to pack the snow layer with tracked vehicles into a thin layer, thereby increasing its density and reducing its insulating properties. The other is to remove it altogether, typically with vehicles fitted with a snowplow. Once the ice has reached the target thickness (via accelerated growth after removing the insulating effects of the snow), road construction per se may commence.
Sources: en.wikipedia.org
=== Inhibitors === Increased serum [Ca2+]. Severe decreases in serum [Mg2+], which also produces symptoms of hypoparathyroidism (such as hypocalcemia). Calcitriol Increase in serum phosphate. Fibroblast growth factor-23 (FGF23) is produced in osteoblasts (from bone) in response to increases in serum phosphate (Pi). It binds to the fibroblast growth factor receptor of the parathyroid and suppresses PTH release. This may seem contradictory because PTH actually helps rid the blood of phosphates but it is also causes release of phosphate into the blood from bone resorption. FGF23 inhibits PTH and then takes its place helping inhibit re-absorption of phosphate in the kidney without the phosphate releasing effect on bones.
==== Estrogens (estrogen receptor agonists) ==== Conjugated estrogens (conjugated equine estrogens; CEEs; Premarin) – estrogen (estrogen receptor agonist) – atrophic vaginitis, dyspareunia [132] Conjugated estrogens oral (Enjuvia; synthetic conjugated estrogens) – estrogen (estrogen receptor agonists) – atrophic vaginitis [133] Conjugated estrogens/bazedoxifene (Aprela; bazedoxifene acetate/conjugated estrogens; bazedoxifene/conjugated estrogens; bazedoxifene/Premarin; BZA/CE; CE/BZA; conjugated estrogens/bazedoxifene acetate; Duavee; Duavive; Premarin/bazedoxifene; SERM + Premarin) – combination of conjugated estrogens (estrogen) and bazedoxifene (selective estrogen receptor modulator (SERM)) – atrophic vaginitis [134] Estradiol (Estrofem; Innofem; oral estradiol; Vagifem; vaginal estradiol) – estrogen (estrogen receptor agonist) – atrophic vaginitis [135] Estradiol transdermal micro patch (Estradot; Minivelle; Vivelle-Dot) – estrogen (estrogen receptor agonist) – atrophic vaginitis [136] Estradiol vaginal (E2; 17β-estradiol; Estradiol VagiCap; Imvexxy; Joyesta; TX-12-004-HR; TX-004HR; VagiCap; Yuvvexy) – estrogen (estrogen receptor agonist) – atrophic vaginitis [137] Estradiol acetate (Estrace; estradiol acetate intravaginal ring; estradiol acetate IVR; Femring; Menoring) – estrogen (estrogen receptor agonist) – atrophic vaginitis [138] Estriol succinate vaginal gel (6α-hydroxyestradiol; Blissel; Gelistrol) – estrogen (estrogen receptor agonist) – atrophic vaginitis [139] Estriol/lactobacillus (estriol-Lactobcillus acidophilus mixt.; estriol/lyophilised lactobacilli; Gynoflor; ultra-low dose estrogen/lactobacillus) – combination of estriol (estrogen) and lactobacillus (probiotic) – atrophic vaginitis [140] Ospemifene (FC-1271a; Ophena; Osphena; Senshio) – selective estrogen receptor modulator (SERM) – atrophic vaginitis, dyspareunia [141]
=== Coronary artery disease === Homocysteine, a sulfur based amino acid is the main product of methionine demethylation. Elevated homocysteine is an independent risk factor for cardiovascular disease and inversely correlated to consumed vitamin B12/B6 and folate levels. Homocysteine methylation to methionine is catalyzed by MTR, resulting in appropriate intracellular levels of methionine and tetrahydrofolate, alongside non-toxic homocysteine levels. The GG phenotype promotes the development of premature coronary artery disease (CAD) independent of hyperhomocysteinemia. Hyperhomocysteinemia is associated with cerebral, coronary and peripheral atherosclerotic pathology as it promotes endothelial cell dysfunction, platelet adhesion and vascular smooth muscle cell proliferation. DNA damage and homocysteine levels are proportional to CAD severity. Micronucleus frequency in human lymphocytes, dependent on homocysteine levels increases reactive oxygen species and uracil incorporation in DNA methylation, promoting genetic alterations and point mutations. The (MTRR):c.66A>G, polymorphism containing chromosome is prone to fragmentation. This chromosomal loss or global DNA hypomethylation results in under condensation of pericentromeric heterochromatin, micronucleus formation and elevated risks of aneuploidy. Co-expression of this mutation and the 677T polymorphism in methionine tetrahydrofolate reductase (MTHFR) Methylenetetrahydrofolate reductase act to further the extent of DNA damage.
== The Strep-tag principle == Just like other short-affinity tags (His-tag, FLAG-tag), the Strep-tag can be easily fused to recombinant proteins during subcloning of its cDNA or gene. For its expression, various vectors for various host organisms (E. coli, yeast, insect, and mammalian cells) are available. A particular benefit of the Strep-tag is its rather small size and the fact that it is biochemically almost inert. Therefore, protein folding or secretion is not influenced and usually it does not interfere with protein function. Strep-tag is especially suited for analysis of functional proteins, because the purification procedure can be kept under physiological conditions. This not only allows the isolation of sensitive proteins in a native state, but it is also possible to purify intact protein complexes, even if just one subunit carries the tag. In the first step of the Strep-tag purification cycle, the cell lysate containing Strep-tag fusion protein is applied to a column with immobilized Strep-Tactin (step 1). After the tagged protein has specifically bound to Strep-Tactin, a short washing step with a physiological buffer (e.g. phosphate buffered saline, PBS) removes all other host proteins (step 2). This is due to Strep-Tactin's low tendency to bind proteins non specifically. Then, the purified Strep-tag fusion protein is gently eluted with a low concentration of desthiobiotin, which specifically competes for the biotin binding pocket (step 3). To regenerate the column, desthiobiotin is removed by application of a HABA containing solution (a yellow azo dye).
Sources: en.wikipedia.org
Thank you." In January 2016, Schumer was accused of stealing jokes from comedians Tammy Pescatelli, Kathleen Madigan, Wendy Liebman, and Patrice O'Neal. Schumer denied the allegations. Other comedians, such as Marc Maron and Dave Rubin, defended Schumer. Pescatelli later apologized, stating it had "gone too far" and was probably "parallel thinking".
Mambalgin1 binding to hASIC1aΔC induces a conformational change in Finger-II of Mamba1. The significant residues from hASIC1aΔC in this interaction are Asp347, Asp351, and Phe352 on the α5 helix of the thumb domain. These residues interact with Phe27 and Arg28 on Mambalgin1, likely forming salt bridges and causing the hASIC1aΔC residues to flip outward from the acidic pocket. This change is significant as the tip region of Finger-II flips to the thumb domain of hASIC1aΔC to facilitate the interaction between the toxin and the channel.
== Diagnosis == SJIA is diagnosed clinically and corroborated by typical test findings; it is a diagnosis of exclusion. Other causes of fever, such as infections, cancer, and other inflammatory/rheumatologic disorders such autoinflamatory syndromes, systemic lupus erythematosus, and Kawasaki disease, must be ruled out. When a child is suspected of having sJIA, they should always have a full evaluation for infection and cancer. This evaluation should include blood and urine cultures, imaging tests, and perhaps a bone marrow exam or lymph node biopsy to rule out leukemia or lymphoma. According to the most recent International League of Associations for Rheumatology (ILAR) criteria, a child must have arthritis, ≥2 weeks of daily fever that is documented as occurring daily for ≥3 days, and any one of the following symptoms to be classified as having sJIA: organomegaly, lymphadenopathy, serositis, or non-fixed/evanescent rash While there are typical patterns of laboratory abnormalities, such as elevated C-reactive protein levels, high erythrocyte sedimentation rates, neutrophilia, thrombocytosis, and microcytic anemia, there are no particular laboratory tests for sJIA.
Eurogamer echoed criticism on the game's length; reviewer Tom Bramwell commented that "although I'm hard pressed to criticize what you get, the complete absence of everything we've learnt from the likes of Counter-Strike and everything since is frankly bizarre". Bramwell did, however, criticize the game's artificial intelligence and the occasional bug that caused a player to get stuck on a wall. PC Zone's Mark Hill was more lenient, praising the game's artificial intelligence as "intelligent as you could hope an AI enemy to be". In addition, Hill praised the game for showing more activity in the base, noting that "a whole world goes on around you, with people eating at a cantina and scientists doing their laundry. The complex is more alive than ever before". Hill also praised the focus "on a greater interaction with scientists as proper people rather than the two or three models that were cloned throughout the facility who kept repeating the same phrases", describing this as Blue Shift's "greatest achievement". PC Zone's review closed by commenting that "as a Dreamcast extra it works perfectly, but as a standalone PC title there's not nearly enough to it." In his negative review of the game, Jim Preston of NextGen recommended that players play the Half-Life mods They Hunger or Day of Defeat instead. The game sold around 800,000 units at retail, excluding digital sales on Steam.
== Incubation length == Incubation times vary based upon the microbe that requires culturing. Traditional culturing techniques, for example, require less than 24 hours culture time for Escherichia coli but 6–8 weeks for successful culturing of Mycobacterium tuberculosis before definitive results are expressed. A benefit of non-culture tests is that physicians and microbiologists are not handicapped by waiting periods. Incubation follows a growth curve variable for every microorganism. Cultures follow a lag, log, stationary, and finally death phase. The lag phase is not well known in microbiology, but it is speculated that this phase consists of the microorganism adjusting to its environment by synthesizing proteins specific for the surrounding habitat. The log phase is the period where a culture experiences logarithmic growth until nutrients become scarce. The stationary phase is when culture concentration is the highest and cells stop reproducing. When nutrients in the environment are depleting, organisms enter the death phase where toxic metabolites become abundant and nutrients are depleted to the point where cell death exceeds reproduction.
Sources: en.wikipedia.org
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.
Early-stage trials examined lipid and glucose markers, but the development program was discontinued. Published human results are limited and do not support approved use for any indication. Claims of performance or health benefits remain unproven.
Yes. Laboratories use LC-MS/MS to detect GW501516 and its metabolites in urine. Detection depends on timing and sensitivity, but the substance is banned at all times.
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.