This is a working overview of PPARδ, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-10-04 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.
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.
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.
| 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. |
=== Lifespan === The lifespan of a starfish varies considerably among species. For example, Leptasterias hexactis reaches sexual maturity at 20 g (0.7 oz) in two years and lives for about ten years. Pisaster ochraceus matures at 70–90 g (2.5–3.2 oz) in five years and has a maximum recorded lifespan of 34 years.
The Cherokee Freedmen, descendants of African American slaves owned by citizens of the Cherokee Nation during the Antebellum Period, were first guaranteed Cherokee citizenship under a new treaty made in 1866 with the United States. This was in the wake of the American Civil War, when the US emancipated slaves by passing a constitutional amendment granting freedmen citizenship in the United States. After the war the US government required that the Cherokee Nation, which under pressure had briefly allied with the Confederate States of America, end slavery and grant full citizenship to Freedmen living within their nation. Those who left could become United States citizens. However, despite "the promises of the 1866 treaty, the freedmen were never fully accepted as citizens of the Cherokee Nation" during the 19th and 20th centuries. In practice, enrollment in the Cherokee Nation rolls was often strongly influenced by race. During creation of the Dawes Rolls prior to allotment of tribal communal lands to households, many Freedmen and Afro-Cherokees were listed separately from Cherokee by blood, regardless of their ancestry or culture. As a result, they did not receive land allotments and later were for a time excluded from tribal membership.
== Plot == In Chile, Michael Green, a retired former employee of assassin organization Damocles, is killed by a specialist hit squad consisting of decoy Sindy, sniper Facundo, and an assault team of Alexei, Karl, and Hilde, all of whom are also Damocles employees. Duncan Vizla, "The Black Kaiser", is a Damocles employee nearing mandatory retirement on his 50th birthday. By making sizable contributions to his company retirement fund, he is owed over $8 million when he retires. Duncan is pressured into accepting one final contract by Vivian, a common associate of Damocles. He travels to Belarus to fulfill the mission, but finds it was a setup to have him killed. Unknown to him, Mr. Blut, owner of Damocles, plans to sell the company and is inflating its value by murdering its retired operatives, receiving their retirement benefits by way of a clause in their contract that lists Damocles as a beneficiary. Duncan, living in a remote Montana town, is haunted by flashbacks of his violent past. He begins to build a friendship with his troubled new neighbor, Camille. One day, after giving an ill-fated talk at a school about foreign countries and combat, he gives Camille a gun as a gift. While trying to teach her how to shoot, she breaks down, seemingly disturbed by the weapon. Meanwhile, Facundo's squad works to locate Duncan's residence. While beating his accountant, Lomas, they receive a list of his current property holdings. They work through the list without any success, killing the residents of each property.
Sources: en.wikipedia.org
=== Lineage-dependent features === Features of de novo genes can depend on the species or lineage being examined. This appears to partly be a result of varying GC content in genomes and that young genes bear more similarity to non-genic sequences from the genome in which they arose than do established genes. Features in the resulting protein, such as the percentage of transmembrane residues and the relative frequency of various predicted secondary structural features show a strong GC dependency in orphan genes, whereas in more ancient genes these features are only weakly influenced by GC content. The relationship between gene age and the amount of predicted intrinsic structural disorder (ISD) in the encoded proteins has been subject to considerable debate. It has been claimed that ISD is also a lineage-dependent feature, exemplified by the fact that in organisms with relatively high GC content, ranging from D. melanogaster to the parasite Leishmania major, young genes have high ISD, while in a low GC genome such as budding yeast, several studies have shown that young genes have low ISD. However, a study that excluded young genes with dubious evidence for functionality, defined in binary terms as being under selection for gene retention, found that the remaining young yeast genes have high ISD, suggesting that the yeast result may be due to contamination of the set of young genes with ORFs that do not meet this definition, and hence are more likely to have properties that reflect GC content and other non-genic features of the genome.
== Classification == Metal complexes, also including all coordination compounds, include virtually all metal compounds. The study of "coordination chemistry" is the study of "inorganic chemistry" of all alkali and alkaline earth metals, transition metals, lanthanides, actinides, and metalloids. Thus, coordination chemistry is the chemistry of the majority of the periodic table. Metals and metal ions exist, in the condensed phases at least, only surrounded by ligands. The areas of coordination chemistry can be classified according to the nature of the ligands, in broad terms:
==== Slow-tight ==== Slow-tight inhibition occurs when the initial enzyme–inhibitor complex EI undergoes conformational isomerism (a change in shape) to a second more tightly held complex, EI*, but the overall inhibition process is reversible. This manifests itself as slowly increasing enzyme inhibition. Under these conditions, traditional Michaelis–Menten kinetics give a false value for Ki, which is time–dependent. The true value of Ki can be obtained through more complex analysis of the on (kon) and off (koff) rate constants for inhibitor association with kinetics similar to irreversible inhibition.
Sources: en.wikipedia.org
== History and etymology == In 1840-1841, Carl Julius Fritzsche was able to extract and crystallize two acids from the products of reaction of indigo dye with caustic potash, which he called chrysanilic and anthranilic acids after their colors before purification (golden yellow and black respectively) and the plant anil (Indigofera suffruticosa). The former was identified as ortho-carboxy anil of indoxyl-2-aldehyde only in 1910 while the latter was identified as salicylamide already in 1843 by Cahours.
==== GMO synthesis ==== In 2022, a GMO produced N. benthamiana were discovered that were able to produce 25% of the amount of cocaine found in a coca plant. However, since N. benthamiana also naturally contains nicotine, separating the cocaine from nicotine and related alkaloids would be challenging.
== B == B cell - bacteria - bacterial conjugation - bacterial outer membrane protein - bacterial protein - bacteriorhodopsin - base (chemistry) - base pair - base sequence - basic fibroblast growth factor - Bcl-2 - bcr-abl fusion protein - benzene - benzene ring - beta-2 microglobulin - beta adrenergic receptor - beta sheet - beta-1 adrenergic receptor - beta-2 adrenergic receptor - beta-thromboglobulin - bioaccumulation - biochemistry - biodiversity - bioethics - biogenic amine receptor - bioinformatics - biological membrane - biologist - biology - biomechanics - biomedical model - biomolecule - biophysics - biopolymer - biosalinity - biotechnology - BLAST - blood proteins - boiling point - Boltzmann distribution - Boltzmann principle - bombesin - bombesin receptor - bone morphogenetic protein - bradykinin - bradykinin receptor - BRCA1 - buffer solution
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.
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.