This is a working overview of 三重激动剂, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-30. Anything still debated is marked as such rather than presented as settled.
Development has progressed from single- and multiple-ascending-dose studies in healthy volunteers into larger randomized trials in adults with obesity, type 2 diabetes, and fatty liver disease. Early reports describe dose-dependent reductions in body weight and improvements in glycemic markers over treatment periods of several months. Whether the glucagon arm adds tolerability cost without added benefit is still debated. Long-term cardiovascular outcomes, effects after treatment stops, and performance in older or comorbid populations are open questions rather than settled findings. Approval status may change, so the current investigational label should be confirmed against regulatory sources.
Retatrutide is an investigational synthetic peptide developed under the code LY3437943, with a backbone derived from glucose-dependent insulinotropic polypeptide. Several non-proteinogenic residues, including alpha-aminoisobutyric acid, appear in that backbone, and a fatty diacid side chain attached through a linker extends circulation time. The molecule carries roughly thirty-nine amino acid units and a total mass near 4.7 kilodaltons. Administration is by subcutaneous injection once weekly. Published work uses both the name retatrutide and the code LY3437943.
Stability depends strongly on physical state. Dry powder is comparatively robust when held at -20 °C or below, desiccated and shielded from light; under those conditions degradation is slow and measured over years. Once dissolved, the peptide becomes far more vulnerable: backbone hydrolysis, oxidation of susceptible residues and aggregation all proceed faster in solution, and the rates climb with temperature and with pH far from neutral. Refrigerated storage at 2–8 °C extends usable life for short periods, and repeated freeze–thaw cycles are best avoided.
Identity and purity are established by instrumental methods rather than by appearance. Reversed-phase high-performance liquid chromatography separates the peptide from related impurities and yields a purity value, usually expressed as the share of total peak area. Mass spectrometry checks that the observed mass agrees with the mass calculated from the published sequence, while peptide mapping or amino acid analysis adds structural evidence. Water content, counter-ion identity and residual solvents are sometimes reported as well. A certificate of analysis should name the method behind each figure, because results are method-dependent.
Laboratory handling follows the conventions used for other synthetic peptides. Lyophilized material is weighed and dissolved in an aqueous diluent, typically sterile water or bacteriostatic water, using gentle swirling rather than vigorous shaking, because foaming stresses the chain. Solutions are prepared under clean conditions and, where sterility matters, passed through a suitable filter. Working portions are kept small so that stock material is not repeatedly warmed and cooled, a practice that limits both aggregation and gradual loss of activity.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide of about 39 residues | Backbone derived from a GIP sequence |
| Molecular mass | Approximately 4.7 kDa | Peptide chain plus fatty diacid moiety |
| Receptor targets | GLP-1, GIP, glucagon | Unimolecular triple agonist |
| Typical storage temperature | 2 to 8 degrees Celsius | Protect from light; avoid repeated freeze-thaw |
| Common analytical method | LC-MS/MS | Used for plasma quantification and purity checks |
Acting as a triple agonist, the molecule binds the GLP-1, GIP, and glucagon receptors. GLP-1 activity slows gastric emptying and dampens appetite, while GIP signaling contributes to insulin sensitivity and fat metabolism. Glucagon receptor engagement raises energy expenditure and encourages fat breakdown, although it can also elevate blood glucose. Combining three pathways is intended to yield larger weight reduction than single or dual agonists, and researchers continue to examine how the balance among them shapes tolerability.
Clinical studies have reported notable reductions in body weight among participants. Early trials measured safety and explored several dose levels, and later studies tracked body-weight change over months of treatment. Investigators also monitor effects on glycemic markers, liver fat, and blood lipids. Because the compound is still in development, questions about long-term safety, cardiovascular outcomes, and durability after treatment ends remain open.
化学修饰延长了分子在体内的停留时间，使较低频次的给药安排成为可能。脂肪酸侧链通过与白蛋白结合延缓清除，非天然氨基酸则降低酶解速率。这些修饰同时改变分子的溶解性与稳定性，需要在制剂设计和储存条件中一并考虑。修饰引入的免疫原性风险也属于开发过程中需要评估的项目。
该化合物处于临床试验阶段，尚未在多数地区取得上市许可。公开信息主要来自企业公告、学术会议摘要与试验注册平台记录，完整数据仍在逐步披露。关于长期疗效与安全性的判断，需要等待规模更大、随访更久的研究结果，目前不宜对最终结论作出预判。
Each receptor contributes a different physiological effect. Activation of the GLP-1 receptor slows gastric emptying and reduces appetite signaling in the brain. GIP receptor activity influences insulin secretion and lipid handling, while glucagon receptor stimulation raises energy use and fat oxidation. Combining these pathways is intended to produce weight loss beyond what single- or dual-receptor agonists achieve. Researchers attribute the observed potency to simultaneous engagement of all three targets, though the exact contribution of each receptor to overall effect remains under investigation.
Clinical development has advanced through phase 2 trials in adults with obesity and type 2 diabetes. Reported phase 2 results described substantial average weight reduction over roughly forty-eight weeks of weekly dosing. A phase 3 program is ongoing to confirm efficacy and assess long-term safety. Because the compound has not received regulatory approval, it is not available as a prescription product. Public discussion of retatrutide often conflates trial findings with marketed status, an important distinction when interpreting coverage of the topic.
Retatrutide is a synthetic peptide developed as a single molecule that activates three distinct hormone receptors: GLP-1, GIP, and glucagon. The compound carries the internal designation LY3437943 and was engineered by modifying the backbone of glucose-dependent insulinotropic polypeptide. Its sequence incorporates non-natural amino acids and a fatty acid side chain that extends circulation time. The triple-agonist design aims to combine appetite suppression, improved insulin response, and increased energy expenditure in one agent. Published reports describe it as an investigational product rather than an approved medicine.
Considered radicals by another moderate current of the PCC, they used terrorism to intimidate authorities of the prison system and were withdrawn from leadership in November 2002, when the leadership was taken over by the current leader of the organization, Marcos "Marcola" Willians Herbas Camacho. Marcola would eventually order the deaths of Geleião and Cesinha for having testified to the police, as well as for allegedly leaving the faction and creating a splinter group called the "Terceiro Comando da Capital" (Third Capital Command, TCC), which is now considered to be defunct.
Through this mechanism the liver may be restored to its original state, scar-free. However, despite nearly 80 years of research on liver regeneration much debate still surrounds the exact mechanisms by which the process occurs. Another example of spontaneous regeneration endometrial lining of the uterus after menses during reproductive years. Endometrial glands from a basal layer of the uterine wall can regenerate the functional layer without fibrosis or scarring. By 2014 the kidney had been found to have the ability to regenerate. Following removal or incapacitation of one kidney the other may double in size in order to counteract the loss of the other kidney. This is known a compensatory growth. Induced regeneration stimulated by an outside source of a "non-regenerative" organ. In humans is for therapeutic use. Induced regeneration is being trialled to replace organ transplants as issues such as rejection, lack of donors, and scarring would be eliminated. The table below details some of the tissues in which induced regeneration has been attempted;
A&W Restaurants entered the Canadian market in 1956. In 1972, the American company sold the Canadian unit to Unilever thus creating A&W (Canada). In 1995, it was spun off into an independent entity with no ties to its American counterpart. They have over 800 locations nationwide.
==== Nutraceuticals ==== Nutraceuticals (from nutrient + pharmaceutical) are substances that are placed in food to enhance nutrition. The increased bioavailability of these substances is relative to the size of the nanocarrier. The smaller the nanocarrier, the better the delivery properties and the solubility of the nutraceuticals; the nanocarrier is able to enter the bloodstream easier if smaller. Lipid or polymer-based (natural biodegradable) are used for encapsulation for nutraceuticals. Types of polymers used include collagen, gelatin, and albumin.
Sources: en.wikipedia.org
The classification according to the Four Natures (四气; sì qì): hot, warm, cool, or cold (or, neutral in terms of temperature) and hot and warm herbs are used to treat cold diseases, while cool and cold herbs are used to treat heat diseases. The classification according to the Five Flavors, (五味; wǔ wèi, sometimes also translated as Five Tastes): acrid, sweet, bitter, sour, and salty. Substances may also have more than one flavor, or none (i.e., a "bland" flavor). Each of the Five Flavors corresponds to one of zàng organs, which in turn corresponds to one of the Five Phases. A flavor implies certain properties and therapeutic actions of a substance; e.g., saltiness drains downward and softens hard masses, while sweetness is supplementing, harmonizing, and moistening. The classification according to the meridian – more precisely, the zàng-fu organ including its associated meridian – which can be expected to be primarily affected by a given compound.
Scholars associate the Roman, Hellenic, and Christian imperial identities with the general population, but there is ongoing debate about how these and other regional identities blended together. As many as 27 million people lived in the empire at its peak in 540, but this fell to 12 million by 800. Although plague and territorial losses to Arab Muslim invaders weakened the empire, it eventually recovered and by the near end of the Macedonian dynasty in 1025, the population is estimated to have been as high as 18 million. A few decades after the recapture of Constantinople in 1282, the empire's population was in the range of 3–5 million; by 1312, the number had dropped to 2 million. By the time the Ottoman Turks captured Constantinople, there were only 50,000 people in the city, one-tenth of its population in its prime. Slavery remained legal but declined in economic importance as many former slave roles became free professions and the state increasingly promoted intermediate forms of dependency such as the coloni. From the 4th century, imperial legislation progressively limited owners' powers and restricted the enslavement of children, prisoners of war, and eventually Christians.
=== Thyroid hormone uptake === Thyroid hormone uptake (Tuptake or T3 uptake) is a measure of the unbound thyroxine binding globulins in the blood, that is, the TBG that is unsaturated with thyroid hormone. Unsaturated TBG increases with decreased levels of thyroid hormones. It is not directly related to triiodothyronine, despite the name T3 uptake. Reference ranges:
=== TruB === The TruB family only contains PUS 4 located in the mitochondrion and nucleus. PUS 4 modification is heavily conserved located in the U55 in the elbow of the tRNA. The human form of PUS 4 is actually missing a binding domain called PUA or pseudouridine synthase and archaeosine trans-glycosylase. PUS 4 has a sequence specificity for T-loop part of the tRNA. Preliminary data of PUS4 modifying mRNA, but more research is needed to confirm. Also binds to a specific Brome Mosaic Virus, which is a plant-infecting RNA virus.
{\displaystyle {\boldsymbol {\sigma }}(\mathbf {u} ,p){\hat {\mathbf {n} }}={\bigl (}-p\mathbf {I} +2\mu {\boldsymbol {\varepsilon }}(\mathbf {u} ){\bigr )}{\hat {\mathbf {n} }}=-p{\hat {\mathbf {n} }}+\mu {\frac {\partial {\boldsymbol {u}}}{\partial {\hat {\mathbf {n} }}}}.}
Sources: en.wikipedia.org
On 7 December 2024, Syrian rebels announced that they had started surrounding Damascus after capturing nearby towns, with rebel commander Hassan Abdul Ghani stating: "Our forces have begun implementing the final phase of encircling the capital Damascus." The rebels started encircling the capital after capturing Al-Sanamayn, a town 20 kilometres (12 mi) from the southern entrance of Damascus. In the Rif Dimashq region, pro-government forces withdrew from the towns of Assal al-Ward, Yabroud, Flitah, Al-Naseriyah and Artouz, while rebels came within 10 kilometres (6.2 mi) of Damascus. The Syrian government denied claims that its army had withdrawn from positions near the city. By the evening, pro-government forces had left the towns on the outskirts of Damascus, including Jaramana, Qatana, Muadamiyat al-Sham, Darayya, Al-Kiswah, Al-Dumayr, Daraa and sites near the Mezzeh Air Base. Maher al-Assad and his 4th Division were reportedly among the few loyalists who still tried to defend the city; his second-in-command was later found dead in his office, possibly indicating violent disputes over the orders and escapes of many military officers. According to the Syrian Observatory for Human Rights, Syrian rebels were active in the Damascus suburbs of Jaramana, Muadamiyah, and Darayya, and were marching from the east toward Harasta. In the main square of Jaramana, protestors took down a statue of Hafez al-Assad. In the evening, pro-government forces reportedly withdrew from several suburbs where large-scale protests broke out.
== Structure and mechanism == Despite having only four choices for each monomer unit (nucleotides), compared to 20 amino acid side chains found in proteins, ribozymes have diverse structures and mechanisms. In many cases they are able to mimic the mechanism used by their protein counterparts. For example, in self cleaving ribozyme RNAs, an in-line SN2 reaction is carried out using the 2' hydroxyl group as a nucleophile attacking the bridging phosphate and causing 5' oxygen of the N+1 base to act as a leaving group. In comparison, RNase A, a protein that catalyzes the same reaction, uses a coordinating histidine and lysine to act as a base to attack the phosphate backbone. Like many protein enzymes, metal binding is also critical to the function of many ribozymes. Often these interactions use both the phosphate backbone and the base of the nucleotide, causing drastic conformational changes. There are two mechanism classes for the cleavage of a phosphodiester backbone in the presence of metal. In the first mechanism, the internal 2'- OH group attacks the phosphorus center in a SN2 mechanism. Metal ions promote this reaction by first coordinating the phosphate oxygen and later stabling the oxyanion. The second mechanism also follows a SN2 displacement, but the nucleophile comes from water or exogenous hydroxyl groups rather than RNA itself. The smallest ribozyme is UUU, which can promote the cleavage between G and A of the GAAA tetranucleotide via the first mechanism in the presence of Mn2+.
Established uitlanders, including the mining magnates, wanted political, social, and economic control over their lives. These rights included a stable constitution, a fair franchise law, an independent judiciary and a better educational system. The Boers recognised that the more concessions they made to the uitlanders the greater the likelihood—with approximately 30,000 white male Boer voters and potentially 60,000 white male uitlanders—that their independent control of the Transvaal would be lost, and the territory absorbed into the British Empire. The uitlanders resented the taxes levied by the Transvaal government, particularly when this was not spent on Johannesburg or uitlander interests but diverted to projects elsewhere in the Transvaal. For example, as the gold-bearing ore sloped away from the outcrop underground to the south, more and more blasting was necessary to extract it, and mines consumed vast quantities of explosives. A box of dynamite costing five pounds included five shillings tax. Not only was this tax perceived as exorbitant, but British interests were offended when President Paul Kruger gave monopoly rights for the manufacture of the explosive to a non-British branch of the Nobel company, which infuriated Britain. The so-called "dynamite monopoly" became a casus belli. British imperial interests were alarmed when in 1894–95 Kruger proposed building a railway through Portuguese East Africa to Delagoa Bay, bypassing British-controlled ports in Natal and Cape Town and avoiding British tariffs.
Initial research work was done by Alfred Champagnat at BP's Lavera Refinery in France; a small pilot plant there started operations in March 1963, and the same construction of the second pilot plant, at Grangemouth Oil Refinery in Britain, was authorized. The term SCP was coined in 1966 by Carroll L. Wilson of MIT. The "food from oil" idea became quite popular by the 1970s, with Champagnat being awarded the UNESCO Science Prize in 1976, and paraffin-fed yeast facilities being built in a number of countries. The primary use of the product was as poultry and cattle feed. The Soviets were particularly enthusiastic, opening large "BVK" (belkovo-vitaminny kontsentrat, i.e., "protein-vitamin concentrate") plants next to their oil refineries in Kstovo (1973) and Kirishi (1974). The Soviet Ministry of Microbiological Industry had eight plants of this kind by 1989. However, due to concerns of toxicity of alkanes in SCP and pressured by the environmentalist movements, the government decided to close them down, or convert to some other microbiological processes. Quorn is a range of vegetarian and vegan meat-substitutes made from Fusarium venenatum mycoprotein, sold in Europe and North America. Another type of single cell protein-based meat analogue (which does not use fungi however but rather bacteria) is Calysta. Other producers are Unibio (Denmark) Circe Biotechnologie (Austria) and String Bio (India). SCP has been argued to be a source of alternative or resilient food.
== Epidemiology == McLeod syndrome is present in 0.5 to 1 per 100,000 of the population. McLeod males have variable acanthocytosis due to a defect in the inner leaflet bilayer of the red blood cell, as well as mild hemolysis. McLeod females have only occasional acanthocytes and very mild hemolysis; the lesser severity is thought to be due to X chromosome inactivation via the Lyon effect. Some individuals with McLeod phenotype develop myopathy, neuropathy, or psychiatric symptoms, producing a syndrome that may mimic chorea.
Sources: en.wikipedia.org
As of the mid-2020s retatrutide remains investigational and is not an approved medicine in the United States or the European Union. It has been supplied mainly to participants in clinical trials. Labels and availability can change, so regulatory listings should be checked directly.
Dual agonists act at the GLP-1 and GIP receptors, whereas retatrutide adds glucagon receptor activity on the same peptide. This third activity is the main structural and pharmacological distinction discussed in the literature. Direct head-to-head comparisons remain limited.
Reports usually give the study code LY3437943 alongside the name, the dose in milligrams, and the week at which an endpoint was measured. Percent body-weight change is the most frequent headline measure. Units and populations vary, so comparisons across reports require care.
Purity is normally given as a percentage from reversed-phase HPLC, calculated as the main peak area relative to total peak area. Research-grade material is commonly specified at 95 per cent or higher, with tighter specifications available. The number is method-dependent and should be read alongside the chromatogram.