This is a working overview of GLP-1 analogue, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-06. Anything still debated is marked as such rather than presented as settled.
Receptor activation follows the canonical Gs pathway: binding increases intracellular cyclic AMP, which promotes protein kinase A activity. In pancreatic beta cells this amplifies glucose-dependent insulin release, so secretion rises when blood glucose is high and changes little when it is low. The same signalling suppresses glucagon release from alpha cells and slows gastric emptying. Receptors in the hypothalamus and brainstem are thought to contribute to reduced appetite and lower energy intake. Which of these effects dominates clinical outcomes remains an area of active study.
Semaglutide is a synthetic peptide analogue of glucagon-like peptide-1, a gut hormone released by intestinal L cells after food intake. The natural hormone acts on pancreatic and central receptors but is degraded within minutes by dipeptidyl peptidase-4 and other peptidases. Semaglutide belongs to the class of long-acting GLP-1 receptor agonists, a group distinguished by structural changes that slow breakdown and extend circulation time. Its development followed earlier short-acting analogues and reflects a general strategy in peptide drug design: preserve receptor activity while blocking proteolytic clearance.
Two structural features account for the prolonged half-life of semaglutide. A modified amino acid at position 8 resists cleavage by dipeptidyl peptidase-4, the enzyme that rapidly degrades native GLP-1. A fatty diacid side chain binds serum albumin, which limits renal clearance and protects the peptide from enzymatic breakdown. These modifications yield a plasma half-life of approximately one week in humans, allowing once-weekly administration. The relationship between plasma concentration and clinical effect varies between individuals, and sources of that variability are still being characterized.
Semaglutide is a synthetic peptide analog of glucagon-like peptide-1 (GLP-1), a hormone released from intestinal L-cells after food intake. The compound belongs to the incretin mimetic class and acts at GLP-1 receptors distributed across pancreatic, gastrointestinal, cardiovascular, and central nervous system tissues. Compared with native GLP-1, the molecule carries structural changes that extend its activity from minutes to roughly one week. It is studied for glycemic control in type 2 diabetes and for weight management, and its effects on cardiovascular and other outcomes remain active research areas.
Receptor binding triggers G protein signaling that raises intracellular cyclic AMP in pancreatic beta cells. Insulin release follows in a glucose-dependent manner, so secretion increases when blood glucose is elevated and diminishes when it is not. The same signaling suppresses glucagon release from alpha cells and slows gastric emptying, which blunts the post-meal glucose rise. In the brain, receptor activation in regions such as the arcuate nucleus is associated with reduced appetite and lower energy intake. How much each of these effects contributes to overall weight change is not fully settled.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C187H291N45O59 | free base, without counter-ion |
| Molecular weight | About 4114 Da | peptide backbone plus attached lipid chain |
| Plasma half-life | About 165 hours | supports once-weekly dosing in humans |
| Plasma protein binding | Greater than 99 percent | attributed mainly to serum albumin |
| Receptor target | GLP-1 receptor | Gs-coupled, raises intracellular cyclic AMP |
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.
Semaglutide belongs to the glucagon-like peptide-1 receptor agonist class, a group of synthetic peptides that imitate an incretin hormone released by intestinal L cells after food intake. Native GLP-1 circulates for only a few minutes because dipeptidyl peptidase-4 cleaves it rapidly. The hormone acts on pancreatic islets, the gastrointestinal tract, and several brain regions. Because the natural peptide is short-lived, development work concentrated on analogues that keep receptor activity while resisting enzymatic breakdown and renal clearance.
The semaglutide sequence is a 31-residue analogue of human GLP-1, altered at three positions relative to the parent hormone. Aminoisobutyric acid replaces alanine at position 8, arginine replaces lysine at position 34, and a lipophilic diacid is attached to lysine 26 through a short linker. These features are reported consistently in the structural literature. The position 8 substitution blocks recognition by dipeptidyl peptidase-4, while the attached chain drives strong, reversible association with a carrier protein in blood.
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.
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.
Semaglutide 是一种经结构修饰的胰高血糖素样肽-1 类似物，其主链与内源性 GLP-1(7-36) 约有百分之九十四的序列一致性。第 8 位丙氨酸被 α-氨基异丁酸取代，使二肽基肽酶-4 无法识别原有切割位点。第 34 位赖氨酸换为精氨酸，进一步降低酶解速率。第 26 位赖氨酸经间隔基连接一条含十八个碳的二酸脂肪链，该侧链赋予分子与血浆白蛋白结合的能力。
该分子作为 GLP-1 受体的选择性激动剂发挥作用，受体属于 B 类 G 蛋白偶联受体家族，激活后经 Gs 通路提升细胞内环腺苷酸水平。在胰腺 β 细胞，信号促进葡萄糖依赖性的胰岛素释放，血糖偏低时该作用明显减弱。在胰岛 α 细胞，胰高血糖素分泌受到抑制。中枢神经系统与胃肠道同样存在受体表达，相应信号参与食欲调节以及胃排空速率的降低。
皮下注射后吸收相对缓慢，绝对生物利用度约为百分之八十九，血药浓度峰值通常出现在给药后一到三天。与白蛋白结合使清除减慢，终末半衰期约为一百六十五小时，接近一周。连续给药约四到五周后达到稳态暴露水平。表观分布容积约为每千克零点二五升，血浆蛋白结合率超过百分之九十九。代谢以蛋白水解切割和脂肪二酸侧链的 β-氧化为主，相关产物主要经尿液与粪便排出。
If the concentration of ATP drops in alpha cells, this causes potassium ion channels in the plasma membrane to close. This causes depolarization across the membrane causing calcium ion channels to open, allowing calcium to flood into the cell. This increase in the cellular concentration of calcium causes secretory vesicles containing glucagon to fuse with the plasma membrane, thus causing the secretion of glucagon from the pancreas.
At the end of the fourth century, Ausonius enumerated Aquileia as the ninth among the great cities of the world, placing Rome, Constantinople, Carthage, Antioch, Alexandria, Trier, Mediolanum, and Capua before it. However, such prominence made it a target and Alaric and the Visigoths besieged it in 401, during which time some of its residents fled to the nearby lagoons. Alaric again attacked it in 408. Attila attacked the city in 452. During this invasion, on July 18, Attila and his Huns so utterly destroyed the city that it was afterwards hard to recognize its original site. The fall of Aquileia was the first of Attila's incursions into Roman territory; followed by cities like Mediolanum and Ticinum. The Roman inhabitants, together with those of smaller towns in the neighbourhood, fled en masse to the lagoons, where they laid the foundations of the cities of Venice and nearby Grado. Yet Aquileia would rise again, though much diminished, and continue to exist until the Lombards invaded in 568; the Lombards destroyed it a second time in 590. Meanwhile, the patriarch fled to the island town of Grado, which was under the protection of the Byzantines. When the patriarch residing in Grado reconciled with Rome in 606, those continuing in the Schism of the Three Chapters, rejecting the Second Council of Constantinople, elected a patriarch at Aquileia.
Andrea Patricia Clausen (born 1971) is a British civil servant in the Falkland Islands who has been the Chief Executive of the Falkland Islands since 2025. She is the first resident of the Falkland Islands and first woman to serve as chief executive. Prior to her tenure as chief executive she was a member of the Legislative Assembly of the Falkland Islands from 2005 to 2009.
Some patients may believe they have determined their own allergic sensitivity from observation. A skin test is much better than patient observation for allergy detection. If a serious life-threatening anaphylactic reaction has brought a patient in for evaluation, some allergists may prefer to perform an initial blood test before conducting a skin prick test. Skin testing may also not be possible in patients with widespread skin disease or those who have taken antihistamine within the past several days.
Since this series was only discovered and studied in 1947–1948, its nuclides were never given historic names. Each of the other series have many of their nuclides given historical names. This series has an isotope of radon only produced in a rare branch (not shown in the illustration) but not in the main decay sequence. Other series produce radon in the main decay sequence, which, if occurring in mineral, would tend to migrate through the mineral and be released as radioactive gas. This series ends in thallium (or, practically speaking, bismuth) rather than lead. Its parent nuclides are essentially extinct, explaining why the series was discovered much later, after the development of artificial nucleosynthesis. Each of the other series have primordial parent nuclides. The total energy released from neptunium-237 to thallium-205, including the energy lost to neutrinos, is 49.29 MeV; from californium-249, 66.87 MeV. As the energy of the final step from bismuth to thallium, though known, will not be available until the inconceivable future, it may be better to quote the figures 46.16 MeV and 63.73 MeV to bismuth-209.
Sources: en.wikipedia.org
in a gathering or a date, are known as dining, and large dining events where many people are invited to eat food together are known as banquets or feasts. The craft of preparing and presenting meals for formal eating is called culinary arts, and the person performing such tasks is known as a cook, chef or cater depending on the respective nature of food service. Physicians and dieticians consider eating a healthy diet essential for maintaining peak physical condition. Some individuals may reduce their amount of dietary intake, which may be a result of a voluntary choice as part of dieting lifestyle or as fasting for reasons of religious food prohibition, abstinence or political protest (i.e. a hunger strike). Limited consumption or rationing may also be due to logistical reasons such as a food shortage or a famine, in which case it will lead to starvation and undernutrition. On the contrary, overeating and excessive intake of calories (overnutrition) may lead to obesity and associated health problems, and while the reasons behind it are myriad, its prevalence in the developed world has led some public health professionals to declare an "obesity epidemic".
(2026) provide age estimates for Pleistocene rock art (hand stencils, human figures and non-figurative, geometric motifs) from southeastern Sulawesi (Indonesia) and determine the calcite overlying a hand stencil from Liang Metanduno on Muna Island to be at least 67,800 years old, representing the oldest demonstrated minimum-age constraints for parietal art worldwide reported to date, and interpreted as the oldest known archaeological evidence for the presence of Homo sapiens in Wallacea. Ruff et al. (2026) describe a Late Pleistocene human femur from Wajak (Java, Indonesia), calculate body mass and stature of the studied individual and compare them with data on other Late Pleistocene individuals from East Asia, reporting evidence of greater body mass and relative body breadth in individuals from higher latitudes. Borreggine et al. (2026) reconstruct likely timing and paths of early human migration from Sundaland into Sahul, and find northern routes of migration to be more likely than southern when changes of sea level and ocean currents are taken into account. Evidence of exploitation of a broad range of resources by humans occupying the Inumaki Cave on Biak (Indonesia) during the Last Glacial Maximum is presented by Tolla et al. (2026). Brumm et al. (2026) identify dental pathologies in late Pleistocene and Holocene human remains from the Leang Bulu Bettue and Leang Cappalombo 1 sites (Sulawesi, Indonesia) interpreted as consistent with use of areca nuts as drugs by the studied individuals through sucking on intact nuts. Allen et al.
Westerhoff also notes that for Nāgārjuna, cause and effect do not exist objectively, that is to say, they are not independent of a cognizing subject. As such, cause and effect are "not just mutually interdependent, but also mind-dependent." This means that for Nāgārjuna, causality and causally constructed objects are ultimately just conceptual constructs. Nāgārjuna applies a similar analysis to numerous other kinds of phenomena in the MMK such as motion, the self, and time. Chapter 7 of the MMK attempts to argue against the idea that dependent arising exists either as a conditioned entity or as an unconditioned one. Rejecting both options, Nāgārjuna ends this chapter by stating that dependent arising is like an illusion, a dream or a city of gandharvas (a stock example for a mirage). Chapter 20 tackles the question of whether an assemblage of causes and conditions can produce an effect (it is argued that it cannot). This analysis of dependent arising therefore means that emptiness itself is empty. As Jay Garfield explains, this means that emptiness (and thus dependent origination) "is not a self-existent void standing behind the veil of illusion represented by conventional reality, but merely an aspect of conventional reality."
=== Brand names === As of June 2017, clonidine is marketed under many brand names worldwide: Arkamin, Aruclonin, Atensina, Catapin, Catapres, Catapresan, Catapressan, Chianda, Chlofazoline, Chlophazolin, Clonid-Ophtal, Clonidin, Clonidina, Clonidinã, Clonidine, Clonidine hydrochloride, Clonidinhydrochlorid, Clonidini, Clonidinum, Clonigen, Clonistada, Clonnirit, Clophelinum, Dixarit, Duraclon, Edolglau, Haemiton, Hypodine, Hypolax, Iporel, Isoglaucon, Jenloga, Kapvay, Klofelino, Kochaniin, Lonid, Melzin, Menograine, Normopresan, Paracefan, Pinsanidine, Run Rui, and Winpress. It is marketed as a combination drug with chlortalidone as Arkamin-H, Bemplas, Catapres-DIU, and Clorpres, and in combination with bendroflumethiazide as Pertenso.
=== Medical specialists === The medical treatment of infectious diseases falls into the medical field of Infectious Disease and in some cases the study of propagation pertains to the field of Epidemiology. Generally, infections are initially diagnosed by primary care physicians or internal medicine specialists. For example, an "uncomplicated" pneumonia will generally be treated by the internist or the pulmonologist (lung physician). The work of the infectious diseases specialist therefore entails working with both patients and general practitioners, as well as laboratory scientists, immunologists, bacteriologists and other specialists. An infectious disease team may be alerted when:* The disease has not been definitively diagnosed after an initial workup
Sources: en.wikipedia.org
A multiple-sequence FASTA format, or multi-FASTA format, would be obtained by concatenating several single-sequence FASTA files in one file. This does not imply a contradiction with the format as only the first line in a FASTA file may start with a ";" or ">", forcing all subsequent sequences to start with a ">" in order to be taken as separate sequences (and further forcing the exclusive reservation of ">" for the sequence definition line). Thus, the examples above would be a multi-FASTA file if taken together. Modern bioinformatics programs that rely on the FASTA format expect the sequence headers to be preceded by ">". The sequence is generally represented as "interleaved", or on multiple lines as in the above example, but may also be "sequential", or on a single line. Running different bioinformatics programs may require conversions between "sequential" and "interleaved" FASTA formats.
=== Viet Minh === According to Arthur J. Dommen, the Việt Minh assassinated 100,000–150,000 civilians during the war out of a total civilian death toll of 400,000. Viet Minh militants employed terrorist attacks throughout the conflict as a systematic practice, often targeting European and Eurasian civilians. One of the worst attacks on Europeans was on 21 July 1952, when Viet Minh militants, using grenades, Sten guns, and machetes, massacred twenty unarmed people at a military hospital in Cap St. Jacques—eight officers on sick leave, six children, four Vietnamese servants, and two women. Many French Union and Vietnamese National Army prisoners died in the Việt Minh POW camps as a result of torture. In the Boudarel Affair, French Communist militant Georges Boudarel was discovered to have used brainwashing and torture against French Union POWs in Việt Minh reeducation camps. The French national association of POWs brought Boudarel to court for a war crime charge.
Someone experiencing PTG will achieve elements of Seligman's "good life" theory, including a more meaningful and purposeful valuing of life, improved positive relationships, accomplishment, and a more optimistic and open mindset according to the broaden-and-build theory.
== External links == International Chemical Safety Card 1313 Oregon Veterinary Medical Association (OVMA) Pet Food Contamination Page Archived 2008-10-20 at the Wayback Machine – News and developments updated regularly
=== Cachexia === Certain diseases can cause a complex muscle wasting syndrome known as cachexia. It is commonly seen in cancer, congestive heart failure, chronic obstructive pulmonary disease, chronic kidney disease and AIDS although it is associated with many disease processes, usually with a significant inflammatory component. Cachexia causes ongoing muscle loss that is not entirely reversed with nutritional therapy. The pathophysiology is incompletely understood but inflammatory cytokines are considered to play a central role. In contrast to weight loss from inadequate caloric intake, cachexia causes predominantly muscle loss instead of fat loss and it is not as responsive to nutritional intervention. Cachexia can significantly compromise quality of life and functional status and is associated with poor outcomes.
Sources: en.wikipedia.org
Native GLP-1 is a short-lived peptide cleared within one to two minutes by dipeptidyl peptidase-4 and related enzymes. Semaglutide keeps the receptor-binding backbone but adds substitutions and a lipid chain. These changes block the main cleavage site and allow reversible albumin binding, extending the half-life to roughly 165 hours.
Albumin is the most abundant protein in plasma and carries molecules that bear fatty-acid chains. Binding shields the peptide from renal filtration and from peptidases, keeping a circulating reservoir. Slow release from this reservoir produces sustained receptor occupancy and supports infrequent dosing.
The insulinotropic effect is glucose-dependent, meaning secretion increases mainly when glucose is elevated. This property is often described as lowering the chance of hypoglycaemia when the compound is used alone. Other glucose-lowering agents used at the same time can still cause low blood glucose.
Native GLP-1 is degraded within minutes by dipeptidyl peptidase-4 and cleared quickly. Semaglutide carries a position 8 substitution that blocks that cleavage and a fatty diacid chain that binds albumin. Together these changes extend its circulating half-life to about one week.