If you have been reading about preclinical models and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-04-13. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
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.
A common misconception is that cardarine has been proven safe for human use. In reality, human clinical data are limited, and long-term animal studies have raised concerns about cancer. Another misconception is that it is a supplement or vitamin-like compound. It is a synthetic research chemical with no approved medical indication. Scientific discussion often focuses on its mechanism and detection rather than therapeutic use. Regulatory and anti-doping literature treats it primarily as a prohibited substance.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
| 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 |
Published literature on cardarine includes in vitro assays, rodent experiments, and a small number of human studies. Reports describe effects on exercise capacity and lipid metabolism in animals, while human evidence is sparse. Many online descriptions present the compound as a proven endurance aid, a claim not supported by regulatory approval or large clinical trials. Analytical studies focus on identifying the parent compound and its metabolites in biological samples. Important uncertainties include species differences, dose-response relationships, and the relevance of rodent tumor findings to humans.
Cardarine is the common name for GW501516, a synthetic compound studied as a peroxisome proliferator-activated receptor delta agonist. Researchers developed it to explore treatments for lipid disorders and metabolic conditions. It is not an approved medicine in any country. Early clinical work examined changes in HDL cholesterol and triglycerides, but development was discontinued after animal studies raised concerns about cancer. The compound remains available as a research chemical and appears in discussions of performance enhancement.
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.
GW501516 acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in transcription of genes related to lipid handling and energy use. Activation of PPARδ can shift skeletal muscle toward greater fatty acid oxidation in animal models, which is one reason it drew interest for metabolic disease and exercise research. The exact downstream effects depend on tissue, species, dose, and duration. Human data are sparse, so many proposed benefits remain hypotheses rather than established clinical outcomes.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Activation of PPARδ changes transcription of genes involved in fatty acid transport, mitochondrial function, and skeletal muscle fuel preference. In rodent studies, pharmacological PPARδ activation was associated with increased endurance and altered body composition. These findings generated interest in performance enhancement, but species differences and study designs limit direct extrapolation to humans. Small human trials were conducted in the 2000s and later discontinued. The extent to which cardarine produces similar metabolic or performance effects in people remains an open question.
The Samper administration reacted against FARC's attacks by gradually abandoning numerous vulnerable and isolated outposts in more than 100,000 km2 of the rural countryside, instead concentrating Army and Police forces in the more heavily defended strongholds available, which allowed the guerrillas to more directly mobilize through and influence events in large areas of rural territory which were left with little or no remaining local garrisons. Samper also contacted the guerrillas to negotiate the release of some or all of the hostages in FARC hands, which led to the temporary demilitarization of the municipality of Cartagena del Chairá, Caquetá in July 1997 and the unilateral liberation of 70 soldiers: a move which was opposed by the command of the Colombian military. Other contacts between the guerrillas and the government, as well as with representatives of the religious and economic sectors, continued throughout 1997 and 1998. Altogether, these events were interpreted by some Colombian and foreign analysts as a turning point in the armed confrontation, giving the FARC the upper hand in the military and political balance, making the Colombian government a target of critics from some observers who concluded that its weakness was being evidenced, perhaps even foreshadowing a future guerrilla victory in the middle term. A leaked 1998 U.S. Defense Intelligence Agency (DIA) report went so far as to speculate that this could be possible within 5 years if the guerrilla's rate of operations was kept up without effective opposition.
F. Hoffmann-La Roche AG, commonly known as Roche (), is a Swiss multinational holding healthcare company that operates worldwide under two divisions: Pharmaceuticals and Diagnostics. Its holding company, Roche Holding AG, has shares listed on the SIX Swiss Exchange. The company headquarters are located in Basel. Roche is the fifth-largest pharmaceutical company in the world by revenue and the leading provider of cancer treatments globally. In 2023, the company’s seat in Forbes Global 2000 was 76. The company owns the American biotechnology company Genentech, which is a wholly owned independent subsidiary, and the Japanese biotechnology company Chugai Pharmaceuticals, as well as the United States–based companies Ventana and Foundation Medicine. Roche's revenues during fiscal year 2020, were 58.32 billion Swiss francs. Descendants of the founding Hoffmann and Oeri families own slightly over half of the bearer shares with voting rights (a pool of family shareholders 45%, and Maja Oeri a further 5% apart), with Swiss pharma firm Novartis owning a further third of its shares until 2021. F. Hoffmann-La Roche is a full member of the European Federation of Pharmaceutical Industries and Associations.
=== mz5 === The mz5 format addresses the performance problems present in other XML based formats (such as the above ones). It uses mzML's ontology, but saves the data using the HDF5 backend for reduced storage space requirements and improved read/write speed.
=== Neurosteroid effects === Progesterone, through the actions of neurosteroid active metabolites such as allopregnanolone and pregnanolone, is a potent positive allosteric modulator of the GABAA receptor, the major signaling receptor of the inhibitory neurotransmitter γ-aminobutyric acid (GABA). It can produce sedative, hypnotic, anxiolytic, euphoric, cognitive-, memory-, and motor-impairing, anticonvulsant, and even anesthetic effects with formation of sufficiently high concentrations of its neurosteroid metabolites and consequent GABAA receptor potentiation in the brain. These actions and effects are characteristically similar to those of other GABAA receptor positive allosteric modulators like alcohol, barbiturates, and benzodiazepines. Similarly to other GABAA receptor positive allosteric modulators like alcohol, barbiturates, and benzodiazepines, tolerance has been found to develop with exposure to increased levels of allopregnanolone and related inhibitory neurosteroids. This includes downregulation and desensitization of the GABAA receptor, reduced effects of allopregnanolone and other GABAA receptor activators (e.g., GABATooltip γ-aminobutyric acid and benzodiazepines), and rebound or withdrawal effects upon falls in allopregnanolone levels. In addition, changes in allopregnanolone levels have been implicated in adverse neuropsychiatric effects associated with the menstrual cycle (e.g., dysphoria, depression, anxiety, irritability) and postpartum period (e.g., postpartum depression), as well as in catamenial epilepsy (seizures).
All employers with more than 100 workers are required to be either vaccinated or test for the virus weekly, while 17 million workers at health facilities that receive federal Medicare or Medicaid are ordered to be fully vaccinated. Texas Governor Greg Abbott signs a bill that prohibits social media sites from banning or restricting users based on "the viewpoint of the user or another person", whether or not that viewpoint is expressed on the social media platform itself. September 10 – Trump–Ukraine scandal: Former Rudy Giuliani associate Igor Fruman pleads guilty to one count of soliciting a contribution by a foreign national. September 11 Commemorations take place around the country to mark the 20th anniversary of the September 11 attacks. A minute's silence is held at the World Trade Center site at the exact time each hijacked plane crashed. British tennis player Emma Raducanu defeats Canadian Leylah Fernandez in the Women's singles US Open with a score of 6–4, 6–3, becoming the first player in the Open Era to win a major tournament after coming through qualifiers. September 13 – COVID-19 pandemic in New York: In New York City, schools reopen to one million children for the first time since the start of the pandemic in March 2020. September 14 – A recall election is held in California on whether Governor Gavin Newsom should remain in office, and who his successor should be if he is voted out. Newsom defeats the recall and remains in office.
Sources: en.wikipedia.org
== Function == Although the function of alpha-synuclein is not well understood, studies suggest that it plays a role in restricting the mobility of synaptic vesicles, consequently attenuating synaptic vesicle recycling and neurotransmitter release. An alternate view is that alpha-synuclein binds to VAMP2 (a synaptobrevin) and stabilizes SNARE complexes; though recent studies indicate that alpha-synuclein–VAMP2 binding is critical for alpha-synuclein-mediated attenuation of synaptic vesicle recycling, connecting the two seemingly divergent views. It may also help regulate the release of dopamine, a type of neurotransmitter that is critical for controlling the start and stop of voluntary and involuntary movements. Alpha-synuclein modulates DNA repair processes, including repair of double-strand breaks (DSBs). DNA damage response markers co-localize with alpha-synuclein to form discrete foci in human cells and mouse brain. Depletion of alpha-synuclein in human cells causes increased introduction of DNA DSBs after exposure to bleomycin and reduced ability to repair these DSBs. In addition, alpha-synuclein knockout mice display a higher level of DSBs, and this problem can be alleviated by transgenic reintroduction of human alpha-synuclein. Alpha-synuclein promotes the DSB repair pathway referred to as non-homologous end joining. The DNA repair function of alpha-synuclein appears to be compromised in Lewy body inclusion bearing neurons, and this may trigger cell death.
== Frequency and population == Sleep disorders including sleep apnea have become an important health issue in the United States. Twenty-two million Americans have been estimated to have sleep apnea, with 80% of moderate and severe OSA cases undiagnosed. OSA can occur at any age, but it happens more frequently in men who are over 40 and overweight.
The disorganised basal cells are seen to be responsible for the major airway changes that are characteristic of COPD, and with continued stress can undergo a malignant transformation. Studies have shown that the initial development of emphysema is centred on the early changes in the airway epithelium of the small airways. Basal cells become further deranged in a smoker's transition to clinically defined COPD.
In the Hellenistic world the art of alchemy first proliferated, mingling magic and occultism into the study of natural substances with the ultimate goal of transmuting elements into gold and discovering the elixir of eternal life. Work, particularly the development of distillation, continued in the early Byzantine period with the most famous practitioner being the 4th century Greek-Egyptian Zosimos of Panopolis. Alchemy continued to be developed and practised throughout the Arab world after the Muslim conquests, and from there, and from the Byzantine remnants, diffused into medieval and Renaissance Europe through Latin translations. The Arabic works attributed to Jabir ibn Hayyan introduced a systematic classification of chemical substances, and provided instructions for deriving an inorganic compound (sal ammoniac or ammonium chloride) from organic substances (such as plants, blood, and hair) by chemical means. Some Arabic Jabirian works (e.g., the "Book of Mercy", and the "Book of Seventy") were later translated into Latin under the Latinized name "Geber", and in 13th-century Europe an anonymous writer, usually referred to as pseudo-Geber, started to produce alchemical and metallurgical writings under this name. Later influential Muslim philosophers, such as Abū al-Rayhān al-Bīrūnī and Avicenna disputed the theories of alchemy, particularly the theory of the transmutation of metals.
The most common molecule in the Universe, H2 (molecular hydrogen), is completely invisible to radio telescopes because it has no dipole; its electronic transitions are too energetic for optical telescopes, so detection of H2 required ultraviolet observations with a sounding rocket. Vibrational lines are often not specific to an individual molecule, allowing only the general class to be identified. For example, the vibrational lines of polycyclic aromatic hydrocarbons (PAHs) were identified in 1984, showing the class of molecules is very common in space, but it took until 2021 to identify any specific PAHs through their rotational lines.
Sources: en.wikipedia.org
Forensic chemistry is the application of chemistry and its subfield, forensic toxicology, in a legal setting. It involves the identification, analysis, and interpretation of substances such as drugs, toxin, accelerants, and unknown materials recovered from crimes scenes or biological samples. A forensic chemist can assist in the identification of unknown materials found at a crime scene. Specialists in this field have a wide array of methods and instruments to help identify unknown substances. These include high-performance liquid chromatography, gas chromatography-mass spectrometry, atomic absorption spectroscopy, Fourier transform infrared spectroscopy, and thin layer chromatography. The range of different methods is important due to the destructive nature of some instruments and the number of possible unknown substances that can be found at a scene. Forensic chemists prefer using nondestructive methods first, to preserve evidence and to determine which destructive methods will produce the best results. Along with other forensic specialists, forensic chemists commonly testify in court as expert witnesses regarding their findings. Forensic chemists follow a set of standards that have been proposed by various agencies and governing bodies, including the Scientific Working Group on the Analysis of Seized Drugs. In addition to the standard operating procedures proposed by the group, specific agencies have their own standards regarding the quality assurance and quality control of their results and their instruments.
In Christian tradition, the Four Evangelists are Matthew, Mark, Luke, and John, the authors attributed with the creation of the four canonical Gospel accounts. In the New Testament, they bear the following titles: the Gospel of Matthew; the Gospel of Mark; the Gospel of Luke; and the Gospel of John. These names were assigned to the works by the early church fathers in the 2nd century AD; none of the writers signed their work. The Druze tradition honors several "mentors" and "prophets", including Matthew, Mark, Luke, and John are honored as a prophets. These Gospel writers are respected for their contributions to spiritual knowledge and guidance. Druze doctrine teaches that Christianity is to be "esteemed and praised", as the Gospel writers are regarded as "carriers of wisdom". The number 5 holds special significance within the Druze faith, as it is believed that great prophets come in groups of five. In ancient Greek times, these prophets were represented by Pythagoras, Plato, Aristotle, Parmenides, and Empedocles. In the first century, the five were represented by Jesus, John the Baptist, Saint Matthew, Matthew, and Luke. In the time of the faith's foundation, the five were Hamza ibn Ali ibn Ahmad, Muḥammad ibn Wahb al-Qurashī, Abū'l-Khayr Salama ibn Abd al-Wahhab al-Samurri, Ismāʿīl ibn Muḥammad at-Tamīmī, and Al-Muqtana Baha'uddin.
Organelles are compartments of the cell that are specialized for carrying out one or more functions, analogous to the organs, such as the heart, and lungs. There are several types of organelles held in the cytoplasm. Most organelles are membrane-bound, and vary in size and number based on the growth of the host cell. Organelles include the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, peroxisomes, vesicles, and vacuoles. Membrane-less organelles include the nucleolus in the nucleus, centrosomes, ribosomes, proteasomes, and vaults.
nicotinamide + Nomega-[(2'-phospho-ADP)-D-ribosyl]-protein-L-arginine Thus, the two substrates of this enzyme are NAD+ (or NADP+) and protein L-arginine, whereas its two products are nicotinamide and Nomega-(ADP-D-ribosyl)-protein-L-arginine (or Nomega-[(2'-phospho-ADP)-D-ribosyl]-protein-L-arginine, respectively). This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is NAD(P)+:protein-L-arginine ADP-D-ribosyltransferase. Other names in common use include ADP-ribosyltransferase, mono(ADP-ribosyl)transferase, NAD+:L-arginine ADP-D-ribosyltransferase, NAD(P)+-arginine ADP-ribosyltransferase, and NAD(P)+:L-arginine ADP-D-ribosyltransferase. At least five forms of the enzyme have been characterised to date, some of which are attached to the membrane via glycosylphosphatidylinositol (GPI) anchors, while others appear to be secreted. The enzymes contain ~250-300 residues, which encode putative signal sequences and carbohydrate attachment sites. In addition, the N- and C-termini are predominantly hydrophobic, a characteristic of GPI-anchored proteins.
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.
Yes, WADA prohibits cardarine as a PPARδ agonist. It appears on the prohibited list and can be detected in urine or blood. Athletes using it risk sanctions.