The short version of incretin mimetic fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Receptor activation raises intracellular cyclic AMP through Gs coupling, which promotes glucose-dependent insulin release and suppresses glucagon secretion when blood glucose is elevated. Effects outside the pancreas include slower gastric emptying and altered appetite signalling in the hypothalamus and hindbrain. The relative contribution of each tissue to overall metabolic outcomes remains an area of active investigation. Central mechanisms in particular are inferred mainly from animal models and indirect human measures rather than direct observation.
Serum protein binding dominates the pharmacokinetic profile. The attached chain associates strongly with albumin, shielding the peptide from enzymatic attack and slowing filtration by the kidney. This interaction extends the circulation half-life to roughly one week in humans, which supports weekly administration intervals. An oral version pairs the peptide with an absorption enhancer that transiently alters gastric epithelium, permitting limited uptake; bioavailability by that route is substantially lower than by injection.
Stability studies examine how temperature, pH, and moisture influence degradation rates over time. In aqueous solution, hydrolysis and deamidation accelerate as pH moves away from mildly acidic conditions. Light exposure and residual metal ions can also trigger oxidation of susceptible residues. Accelerated aging at elevated temperature is used to estimate shelf life, though extrapolation to room temperature carries uncertainty because individual degradation pathways do not always scale predictably.
Lyophilized semaglutide powder is typically held at minus twenty degrees Celsius for long-term storage. At that temperature, solid-state degradation reactions proceed slowly and the peptide remains intact for extended periods. Repeated freeze-thaw cycles are best avoided because they promote aggregation and can shift the proportion of monomeric peptide present. Working aliquots are often prepared so that each portion is thawed only once, and desiccant is placed inside the vial to limit moisture uptake.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide, GLP-1 receptor agonist | 31 amino acid residues |
| Molecular formula | C187H291N45O59 | free peptide, no counter-ion |
| Approximate mass | 4114 Da | matches theoretical value |
| Receptor target | Glucagon-like peptide-1 receptor | Gs-coupled, cyclic AMP pathway |
| Circulation half-life | About one week in humans | extended by albumin association |
The company that developed the compound filed it as a long-acting analogue, and it gained first approval in 2017 for type 2 diabetes. Later authorisations from several regulators extended the indication to chronic weight management, and the World Health Organization added the glucagon-like peptide-1 receptor agonist drug class to its model list of essential medicines in 2023. Production uses solid-phase peptide synthesis followed by side-chain conjugation and chromatographic purification. Supply constraints and cost differences across regions are well documented. Literature on long-term outcomes continues to grow, with many trials reporting surrogate endpoints rather than hard clinical endpoints.
Semaglutide is a synthetic peptide of thirty-one amino acids that shares roughly ninety-four percent sequence identity with human glucagon-like peptide-1. Two substitutions resist enzymatic cleavage by dipeptidyl peptidase-4, and a fatty diacid side chain attached through a linker promotes binding to serum albumin. That albumin binding slows renal clearance and extends the circulating half-life from minutes to approximately one week. The structural changes are well established in the published literature. Whether the same modifications affect receptor signalling bias in ways that matter clinically remains an open question.
Activation of the GLP-1 receptor couples to Gs signalling and raises intracellular cyclic AMP in pancreatic beta cells. The resulting insulin release depends on prevailing glucose concentrations, so the effect is greater when glucose is elevated. Receptor engagement also suppresses glucagon secretion and slows gastric emptying, which flattens post-meal glucose excursions. In the central nervous system, signalling in hypothalamic and brainstem regions is associated with reduced appetite and lower energy intake. Studies continue to examine effects on cardiac, renal and hepatic endpoints; whether those benefits are independent of weight change remains an open question.
Clinical development of this compound followed earlier short-acting GLP-1 analogues that required frequent injection. Once-weekly subcutaneous formulations entered use after 2017, and an oral formulation using a permeation enhancer later became available. The oral version pairs the peptide with sodium N-(8-[2-hydroxybenzoyl] amino) caprylate, a carrier that improves uptake across the gastric epithelium. Interest has expanded from glycaemic control into weight management and metabolic liver disease. Regulatory status and approved indications differ between countries, and the product remains subject to ongoing safety monitoring.
Semaglutide is a synthetic peptide that acts as an agonist at the glucagon-like peptide-1 receptor. It is a structural analogue of human GLP-1(7-37), modified to resist enzymatic degradation by dipeptidyl peptidase-4. The peptide backbone contains alpha-aminoisobutyric acid at position 8, a substitution that stabilises the helix and slows cleavage. A fatty diacid side chain attached through a linker at lysine 34 promotes binding to serum albumin, which extends the circulating half-life. These two modifications together allow less frequent administration than native GLP-1 requires.
Reverse-phase high-performance liquid chromatography with ultraviolet detection near 214 or 280 nanometres is widely used to assess purity and to resolve related impurities. Liquid chromatography coupled to mass spectrometry confirms identity through the protonated molecular ion and fragment ions formed in tandem experiments. Capillary electrophoresis and peptide mapping after enzymatic digestion supply complementary information on charge variants and modification sites. Circular dichroism and nuclear magnetic resonance can report on secondary structure in solution. Absolute quantification usually depends on an external standard, and reported purity depends on the detection wavelength and integration parameters chosen.
Lyophilised material appears as a white to off-white cake or powder that is hygroscopic, and containers are usually equilibrated to room temperature before opening to limit condensation. Dissolution is performed in water, phosphate-buffered saline, or a mildly alkaline buffer, since solubility rises above neutral pH. Gentle inversion or low-speed mixing is preferred, because vigorous vortexing can promote surface denaturation and aggregation. Complete dissolution may require several minutes, and brief sonication is sometimes applied. Passing the solution through a 0.22 micrometre membrane removes particulates but does not by itself sterilise the liquid.
== Chemistry == Vitamin B12 is the "generic descriptor" name for any vitamers of vitamin B12. Animals, including humans, can convert cyanocobalamin to any one of the active vitamin B12 compounds. Cyanocobalamin is one of the most widely manufactured vitamers in the vitamin B12 family (the family of chemicals that function as B12 when put into the body), because cyanocobalamin is the most air-stable of the B12 forms, and is the easiest to purify after it is produced by bacterial fermentation. It can be obtained as dark red crystals or as an amorphous red powder. Cyanocobalamin is hygroscopic in the anhydrous form, and sparingly soluble in water (1:80). It is stable to autoclaving for short periods at 121 °C (250 °F). The vitamin B12 coenzymes are unstable in light. Vitamin B12 additionally becomes inactive when exposed to intense heat or electromagnetic radiation.
Shaw's 2014 short film SMILF, which she wrote, directed and starred in opposite Thomas Middleditch, won the 2015 Short Film Jury Award for U.S. Fiction at Sundance. In 2015, SMILF was picked up by Showtime as a half-hour comedy television show with Shaw as showrunner, writing, directing, starring in, and producing the series. The first season, which was shot on location in South Boston as well as Los Angeles, received generally positive reviews, with her portrayal of single mother Bridgette Bird notable for its realism, insight, and biting humor. "Frankie Shaw, it [SMILF] marks the arrival of an important and original voice." SMILF co-stars Connie Britton and Rosie O'Donnell, and tackles subjects like eating disorders and sexual abuse. Shaw said that the show was a way to discuss and portray the role of women on screen. In November 2017, Showtime renewed SMILF for a second season. In December 2018, it was reported that Shaw and the series had been accused of workplace misconduct. In March 2019, the series was cancelled after two seasons. In 2016, Shaw returned to the Sundance Film Festival with another short film she wrote and directed, a dark comedy titled Too Legit, which stars Zoë Kravitz, Teresa Palmer, Nate Corddry and Clark Gregg. Too Legit is inspired by a satire of Congressman Todd Akin's controversial 2012 remarks about rape and pregnancy: "It seems to be, first of all, from what I understand from doctors, [rape resulting in pregnancy is] really rare.
A chiral auxiliary is an organic compound which couples to the starting material to form a new compound which can then undergo diastereoselective reactions via intramolecular asymmetric induction. At the end of the reaction the auxiliary is removed, under conditions that will not cause racemization of the product. It is typically then recovered for future use.
=== Stability and half-lives === All roentgenium isotopes are extremely unstable and radioactive; in general, the heavier isotopes are more stable than the lighter. The most stable known roentgenium isotope, 282Rg, is also the heaviest known roentgenium isotope; it has a half-life of 100 seconds. The unconfirmed 286Rg is even heavier and appears to have an even longer half-life of about 10.7 minutes, which would make it one of the longest-lived superheavy nuclides known; likewise, the unconfirmed 283Rg appears to have a long half-life of about 5.1 minutes. The isotopes 280Rg and 281Rg have also been reported to have half-lives over a second. The remaining isotopes have half-lives in the millisecond range. The missing isotopes between 274Rg and 278Rg are too light to be produced by hot fusion and too heavy to be produced by cold fusion. A possible synthesis method is to populate them from above, as daughters of nihonium or moscovium isotopes that can be produced by hot fusion. The isotopes 283Rg and 284Rg could be synthesised using charged-particle evaporation, using the 238U+48Ca reaction where a proton is evaporated alongside some neutrons.
tap water (5 July), an analysis of the efficacy of the Rotterdam Convention in curbing illegal trade of highly hazardous chemicals shows that large-scale trade of chemicals like tetraethyllead continues (10 July), a researcher reports subterranean climate change urban heat islands may affect the durability of infrastructure and buildings (11 July), a study indicates consumer protection-related validation and quality control for a set of advanced sports supplements such as Dynamine is insufficient, finding most of the tested products either did not contain a detectable amount of the labeled ingredient or substantially deviated from the declared dosage (17 July), a study for the first time determines a wet-bulb temperature threshold where it may be physiologically too hot for daily activity by young healthy adults due to an increase in cardiovascular strain, showing this limit is crossed at a lower temperature than thought previously (20 July), researchers elaborate in a scientific journal why they conclude that "new nuclear is a costly and dangerous distraction" in climate change mitigation (21 July), a study affirms recent findings that suggest revived ancient pathogens from either potential lab-leaks or from permafrost thawing represent significant risks (27 July), scientists provide data about the genetic basis of induced parthenogenesis in sexually reproducing fruit flies which could inform pest control (28 July).
Sources: en.wikipedia.org
Its main geographical units are: the Coastal Plain along the Gulf of Guinea, the Ashanti uplands in the centre, the Volta Basin in the east, which is dominated by Lake Volta, and the Northern Plains stretching to Burkina Faso. The highest point is Mount Afadja (885 m) in the Akwapim-Togo Range. The northernmost settlement in Ghana is Pulmakong near the Burkina Faso border, while the southernmost point is Cape Three Points.
== Limits of reversal == Most tissues and organs of the body can survive clinical death for considerable periods. Blood circulation can be stopped in the entire body below the heart for at least 30 minutes, with injury to the spinal cord being a limiting factor. Detached limbs may be successfully reattached after 6 hours of no blood circulation at warm temperatures. Bone, tendon, and skin can survive as long as 8 to 12 hours. The brain, however, appears to accumulate ischemic injury faster than any other organ. Without special treatment after circulation is restarted, full recovery of the brain after more than 3 minutes of clinical death at normal body temperature is rare. Usually brain damage or later brain death results after longer intervals of clinical death even if the heart is restarted and blood circulation is successfully restored. Brain injury is therefore the chief limiting factor for recovery from clinical death. Although loss of function is almost immediate, there is no specific duration of clinical death at which the non-functioning brain clearly dies. The most vulnerable cells in the brain, CA1 neurons of the hippocampus, are fatally injured by as little as 10 minutes without oxygen. However, the injured cells do not actually die until hours after resuscitation. This delayed death can be prevented in vitro by a simple drug treatment even after 20 minutes without oxygen. In other areas of the brain, viable human neurons have been recovered and grown in culture hours after clinical death.
== Applications of peptide microarrays == Peptide microarrays can be used to study different kinds of protein-protein interactions, specially those involving modular protein substructures called peptide recognition modules or, most commonly, protein interaction domains. The reason for this is that such protein substructures recognize short linear motifs often exposed in natively unstructured regions of the binding partner, such that the interaction can be modelled in vitro by peptides as probes and the peptide recognition module as analyte. Most publications can be found in the context of immune monitoring and enzyme profiling.
Peyronie's disease (PD) is a benign, acquired penile connective tissue disease characterized by the occurrence of fibrotic plaques within the tunica albuginea—the dense elastic covering of the corpora cavernosa. The plaques cause abnormal curvature, pain, penile deformities (e.g., narrowing or indentation), and usually erectile dysfunction, particularly during erection. The condition typically leads to significant sexual and psychological effects, including difficulty with penetration and lowered self-esteem or evasiveness. Peyronie's disease is most often seen in middle-aged and older men with a median age of onset between 55 and 60 years, however, it has also been reported in adolescents. While the etiology of Peyronie's disease is still uncertain, the leading hypothesis is that it arises from dysregulated wound healing in response to chronic microtrauma of the erect penis. This triggers a cascade of profibrotic molecular pathways—most notably overexpression of transforming growth factor-beta 1 (TGF-β1)—that end in fibroblast proliferation, myofibroblast differentiation, and overproduction of type I collagen. Genetic predisposition is supported by family clustering and linkage with systemic fibrosing disorders such as Dupuytren's contracture. Risk factors include age, penile injury, diabetes mellitus, and cigarette smoking. The prevalence of Peyronie's disease has been projected at 1% to 20% among the general population of men increasing with age and comorbidities such as erectile dysfunction (ED) or connective tissue disease.
Meprobamate, 2-methyl-2-propyl-1,3-propanediol dicarbamate is synthesized by the reaction of 2-methylvaleraldehyde with two molecules of formaldehyde and the subsequent transformation of the resulting 2-methyl-2-propylpropan-1,3-diol into the dicarbamate via successive reactions with phosgene and ammonia.
Sources: en.wikipedia.org
== History == Pembrolizumab was invented by scientists at Organon after which they worked with Medical Research Council Technology (which became LifeArc) starting in 2006, to humanize the antibody; Schering-Plough acquired Organon in 2007, and Merck & Co. acquired Schering-Plough two years later. Inventors Gregory Carven, Hans van Eenennaam and Gradus Dulos were recognized as Inventors of the Year by the Intellectual Property Owners Education Foundation in 2016. The development program for pembrolizumab was seen as high priority at Organon, but low at Schering and later Merck. In early 2010, Merck terminated development and began preparing to out-license it. Later, in 2010, scientists from Bristol Myers Squibb published a paper in The New England Journal of Medicine showing that their checkpoint inhibitor, ipilimumab (Yervoy), had shown strong promise in treating metastatic melanoma and that a second Bristol Myers Squibb checkpoint inhibitor, nivolumab (Opdivo), was also promising. Merck at that time had little commitment or expertise in either oncology or immunotherapy, but understood the opportunity and reacted strongly, reactivating the program and filing its IND by the end of 2010. As one example, Martin Huber was one of the few senior people at Merck with strong experience in lung cancer drug development, but had been promoted to senior management and was no longer involved in product development. He stepped down from his role to lead clinical development of pembrolizumab for lung cancer.
== Terms == The ceasefire established a 10-day cessation of hostilities, during which both sides agreed to halt offensive military operations. According to a statement by the United States Department of State, the agreement included the following provisions:
==== Earl G. Graves School of Business and Management ==== The Earl G. Graves School of Business and Management (GSBM) is named in honor of alumnus Earl G. Graves, Sr. and is housed in the Graves School of Business and Management building, which was opened for the Fall Semester 2015 at the western edge of the campus. It contains classrooms, laboratories, and office buildings with rooms for hospitality management students to operate. The GSBM offers Bachelor of Science, Master of Science, Master of Business Administration, and PhD degree programs. These programs are accredited by The Association to Advance Collegiate Schools of Business (AACSB).
Nuclear magnetic resonance (NMR) spectroscopy is the most commonly used technique, often permitting the complete assignment of atom connectivity and even stereochemistry using correlation spectroscopy. The principal constituent atoms of organic chemistry – hydrogen and carbon – exist naturally with NMR-responsive isotopes, respectively 1H and 13C. Elemental analysis: A destructive method used to determine the elemental composition of a molecule. See also mass spectrometry, below. Mass spectrometry indicates the molecular weight of a compound and, from the fragmentation patterns, its structure. High-resolution mass spectrometry can usually identify the exact formula of a compound and is used in place of elemental analysis. In former times, mass spectrometry was restricted to neutral molecules exhibiting some volatility, but advanced ionization techniques allow one to obtain the "mass spec" of virtually any organic compound. Crystallography can be useful for determining molecular geometry when a single crystal of the material is available. Highly efficient hardware and software allows a structure to be determined within hours of obtaining a suitable crystal. Traditional spectroscopic methods such as infrared spectroscopy, optical rotation, and UV/VIS spectroscopy provide relatively nonspecific structural information but remain in use for specific applications. Refractive index and density can also be important for substance identification.
Sources: en.wikipedia.org
It is a synthetic peptide of 31 amino acids, built to resemble the natural incretin hormone GLP-1. Because of its size and composition it is handled analytically like other therapeutic peptides, using chromatographic and mass spectrometric methods rather than the techniques typical of small organic drugs.
The substitution at position 8 removes the site recognised by dipeptidyl peptidase-4, the enzyme that destroys the native hormone within minutes. The linked lipophilic chain then binds circulating albumin, which further limits access by degradative enzymes and reduces renal loss. Together these features lengthen the effective circulation time considerably.
It acts at the glucagon-like peptide-1 receptor, a G protein-coupled receptor that signals mainly through cyclic AMP. Activation is glucose dependent, meaning insulin release is stimulated more strongly when blood glucose is already elevated. Other tissues carrying the same receptor respond as well, which explains effects beyond glucose control.
Manufacturers commonly state multi-year stability when the powder is kept dry and frozen. Actual shelf life depends on residual moisture, vial sealing, and storage temperature. A re-test by chromatography is the only way to confirm remaining purity.