This is a working overview of 肽类药物, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-06-21. Anything still debated is marked as such rather than presented as settled.
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。
retatrutide 是一种人工合成的多肽，设计目标是同时作用于 GIP、GLP-1 与胰高血糖素三种受体。这种三重激动设计试图把多条代谢通路的调节整合进单一分子，而不是只依赖一种肠促胰素受体。分子骨架以天然肽序列为基础，经过非天然氨基酸替换和脂肪酸侧链修饰，以获得更长的作用时间。该方向属于多受体激动剂研究的一部分，与双重激动剂的工作并行推进。
三种受体在能量平衡中的分工并不相同：GLP-1 与 GIP 受体主要参与胰岛素分泌和食欲调节，胰高血糖素受体则与能量消耗及肝糖输出相关。同时激活三者可能产生叠加效应，也可能出现相互制约，具体结果取决于受体亲和力与组织分布。这种组合在理论上可能同时影响体重与血糖指标，但协同关系的细节仍处在研究阶段。
Development has progressed through early- and mid-stage human studies in adults with obesity and with type 2 diabetes. Published phase 2 data reported reductions in body weight and improvements in glycemic markers over the treatment period. No regulatory agency has approved the compound for any indication, and it remains available only within controlled research settings. Whether benefits observed in trials translate into durable outcomes after treatment stops is not yet established.
Retatrutide is an investigational synthetic peptide that acts as an agonist at three distinct G protein-coupled receptors. It combines activity at the glucagon-like peptide-1 receptor, the glucose-dependent insulinotropic polypeptide receptor, and the glucagon receptor within a single molecule. This multi-receptor profile distinguishes it from earlier incretin-based compounds that engage one or two of these pathways. Researchers designed the molecule to test whether simultaneous activation produces greater metabolic effects than single or dual agonism alone.
The peptide backbone is chemically modified to resist rapid enzymatic breakdown in the body. A fatty acid side chain promotes binding to serum albumin, which slows renal clearance and supports an extended circulation time. These modifications allow less frequent administration than would be possible with an unmodified peptide. The precise contribution of glucagon receptor activation to the overall metabolic effect remains an area of active investigation, because glucagon raises glucose while also increasing energy expenditure.
| Property | Value | Notes |
|---|---|---|
| 分子类别 | 合成多肽 | 含非天然氨基酸与脂肪酸侧链 |
| 分子量 | 约 4.7 kDa | 多肽量级，精确值随计法而异 |
| 外观 | 白色至类白色冻干粉 | 常见冻干形态，供复溶使用 |
| 溶解性 | 易溶于水 | 复溶后为澄清至微乳光液体 |
| 常见同义词 | LY3437943 | 开发阶段使用的代号 |
Identity and purity are established with reversed-phase high-performance liquid chromatography and mass spectrometry. Chromatographic profiles reveal related impurities, truncated sequences, and oxidation products, while mass measurement confirms the expected molecular mass. Purity values for research material are typically reported as a percentage by peak area. Reference standards help calibrate retention behavior across instruments. Independent laboratories emphasize method suitability because results depend heavily on column chemistry, gradient, and detection wavelength. Batch-to-batch comparison relies on the same validated method.
Investigational peptide material is commonly distributed as a lyophilized powder in sealed vials. The solid form appears as a white to off-white cake or powder and is hygroscopic once opened. Peptides of this size are sensitive to moisture, repeated freeze-thaw cycles, and prolonged exposure to ambient light. Handling practices therefore emphasize desiccation, minimal vial opening, and cold storage. Working aliquots are often prepared to avoid repeatedly warming the bulk container.
Solid material is generally held at -20 °C or colder, while reconstituted solutions are kept at 2-8 °C and used within a short window. Buffers that maintain a slightly acidic to neutral pH tend to improve short-term peptide stability. Repeated warming and cooling of stock solutions promotes aggregation and should be avoided. Container closures should remain intact, since adsorption to some plastics can reduce the amount of peptide in solution.
Peptides in this class degrade mainly through hydrolysis, oxidation, and aggregation. The lipid modification improves plasma residence time but can also promote self-association in aqueous solution at higher concentrations. Oxidation of methionine and deamidation of asparagine residues are common chemical liabilities that accumulate during storage. Stability studies therefore track purity loss, aggregate formation, and changes in receptor-binding potency over time under defined temperature and humidity conditions.
Solid peptide is generally held as a lyophilised powder at low temperature to slow degradation, with desiccant to limit moisture uptake. Reconstituted solutions are less stable and are usually kept refrigerated and protected from light for short periods. Repeated freeze-thaw cycles are avoided because they encourage aggregation. Laboratory handling includes work in a fume hood or laminar flow cabinet to limit inhalation and contamination. Weighing and transfer steps are performed with antistatic tools to reduce static-driven loss of fine powder.
Characterising a peptide of this size relies on a combination of chromatographic and mass spectrometric techniques. Reversed-phase high-performance liquid chromatography separates the intact molecule from related impurities, while electrospray mass spectrometry confirms molecular mass and detects truncation or oxidation products. Peptide mapping after enzymatic digestion verifies the amino acid sequence and locates modified residues. Because the molecule carries a lipid chain, assays must also distinguish the correctly conjugated product from incompletely acylated species.
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.
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.
Retatrutide is an investigational synthetic peptide engineered to activate three distinct hormone receptors within a single molecule. It targets the glucose-dependent insulinotropic polypeptide receptor, the glucagon-like peptide-1 receptor, and the glucagon receptor simultaneously. This triagonist design distinguishes it from earlier incretin-based compounds that act on one or two of these pathways. Structural modifications relative to native gut hormones extend its residence time in circulation. The molecule remains under clinical evaluation and is not approved for any indication.
Receptor activation produces downstream effects that differ by tissue. GLP-1 receptor signaling influences appetite regulation and insulin secretion in a glucose-dependent manner. GIP receptor activity contributes to metabolic handling of nutrients and may modulate adipose tissue. Glucagon receptor engagement raises energy expenditure and promotes hepatic lipid turnover, though the balance among these actions in humans is still being characterized. Preclinical models showed reductions in body weight and improved glycemic markers.
Clinical development has progressed through phase 2 trials in adults with obesity and type 2 diabetes, with phase 3 programs reported as ongoing. Reported outcomes include reductions in body weight and improvements in glycemic measures over defined treatment periods. Whether these effects translate into durable benefits after treatment ends remains an open question. Long-term safety data across broad populations are not yet complete, and regulatory decisions have not been announced.
Between 400 and 1200 AD, Arab traders introduced opium to China, and to India by 700 AD. The physician Muhammad ibn Zakariya al-Razi of Persian origin ("Rhazes", 845–930 CE) maintained a laboratory and school in Baghdad, and was a student and critic of Galen; he made use of opium in anesthesia and recommended its use for the treatment of melancholy in Fi ma-la-yahdara al-tabib, "In the Absence of a Doctor", a home medical manual directed toward ordinary citizens for self-treatment if a doctor was not available. The renowned Andalusian ophthalmologic surgeon Abu al-Qasim al-Zahrawi ("Abulcasis", 936–1013 CE) relied on opium and mandrake as surgical anesthetics and wrote a treatise, al-Tasrif, that influenced medical thought well into the 16th century. The Persian physician Abū 'Alī al-Husayn ibn Sina ("Avicenna") described opium as the most powerful of the stupefacients, in comparison to mandrake and other highly effective herbs, in The Canon of Medicine. The text lists medicinal effects of opium, such as analgesia, hypnosis, antitussive effects, gastrointestinal effects, cognitive effects, respiratory depression, neuromuscular disturbances, and sexual dysfunction. It also refers to opium's potential as a poison. Avicenna describes several methods of delivery and recommendations for doses of the drug. This classic text was translated into Latin in 1175 and later into many other languages and remained authoritative until the 19th century. Şerafeddin Sabuncuoğlu used opium in the 14th-century Ottoman Empire to treat migraine headaches, sciatica, and other painful ailments.
== Medical uses == Oritavancin is considered a long-lasting antibiotic due to its extended half-life (up to 16 d), high protein binding capacity, and ability to penetrate tissues effectively. It binds strongly to plasma proteins (around 85%), resulting in prolonged release into surrounding tissues. Furthermore, oritavancin exhibits excellent tissue penetration and distribution throughout various sites, including skin structures, synovial fluid (found in joints), bone tissue, and macrophages. Less frequent dosing requirements still keep efficacy against gram-positive infections, which is convenient for prolonged treatment courses such as osteoarticular infections and endocarditis, making it an option for outpatient antibiotic therapy in difficult-to-treat populations where adherence may be challenging and those with limited access to healthcare facilities.
The possibility is mentioned, above, that all living organisms may be descended from an original single-celled organism with a DNA genome, and that this implies a single origin for life. Although such a universal common ancestor may have existed, such a complex entity is unlikely to have arisen spontaneously from non-life and thus a cell with a DNA genome cannot reasonably be regarded as the origin of life. To understand the origin of life, it has been proposed that DNA based cellular life descended from relatively simple pre-cellular self-replicating RNA molecules able to undergo natural selection. During the course of evolution, this RNA world was replaced by the evolutionary emergence of the DNA world. A world of independently self-replicating RNA genomes apparently no longer exists (RNA viruses are dependent on host cells with DNA genomes). Because the RNA world is apparently gone, it is not clear how scientific evidence could be brought to bear on the question of whether there was a single origin of life event from which all life descended.
Here J denotes current density(whose direction is against electron flow by convention) due to electron flow within the considered volume of the semiconductor. It is also called electron current density. Total electron current density is the sum of drift current and diffusion current densities:
The close of the Permian saw the greatest mass extinction known (see the Permian–Triassic extinction event), an event prolonged by the combination of two or more distinct extinction pulses. Most of the earlier parareptile and synapsid megafauna disappeared, being replaced by the true reptiles, particularly archosauromorphs. These were characterized by elongated hind legs and an erect pose, the early forms looking somewhat like long-legged crocodiles. The archosaurs became the dominant group during the Triassic period, though it took 30 million years before their diversity was as great as the animals that lived in the Permian. Archosaurs developed into the well-known dinosaurs and pterosaurs, as well as the ancestors of crocodilians. Since reptiles, first rauisuchians and then dinosaurs, dominated the Mesozoic era, the interval is popularly known as the "Age of Reptiles". The dinosaurs also developed smaller forms, including the feather-bearing smaller theropods. In the Cretaceous period, these gave rise to the first true birds. The sister group to Archosauromorpha is Lepidosauromorpha, containing lizards and tuataras, as well as their fossil relatives. Lepidosauromorpha contained at least one major group of the Mesozoic sea reptiles: the mosasaurs, which lived during the Cretaceous period. The phylogenetic placement of other main groups of fossil sea reptiles – the ichthyopterygians (including ichthyosaurs) and the sauropterygians, which evolved in the early Triassic – is more controversial.
Sources: en.wikipedia.org
In endothelial cells and mammary epithelial cells, the stimulatory effect of IGFBP-3 has been shown to involve activation of the enzyme sphingosine kinase, and generation of the bioactive lipid, sphingosine-1-phosphate, which promotes growth by transactivating the EGFR receptor.
==== Quaternary ammonium ==== The quaternary ammonium compound Dimethyloctadecyl (3-trimethoxysilyl propyl) ammonium chloride (Si-QAC) has been found to have antimicrobial activity when covalently bonded to a surface. Many other quaternary ammonium compounds are known to have antimicrobial properties (e.g. alkyldimethylbenzylammonium chloride and didecyldimethylammonium chloride). These last two are membrane-active compounds; against S. aureus the first forms a single monolayer coverage of the S. aureus cells on the outer membrane, while the second forms a double monolayer. This leads to cell leakage and total release of the intracellular potassium and 260 nm-absorbing pools in this order.
Lucee - Free, open source CFML engine forked from Railo. Lucee's aim is to provide the functionality of CFML using less resources and giving better performance and to move CFML past its roots and into a modern and dynamic web programming platform. Lucee is backed by community supporters and members of the Lucee Association. These are discontinued or down :
Due to its role in generating the activated form of NF-κB, an anti-apoptotic and pro-inflammatory regulator of cytokine expression, proteasomal activity has been linked to inflammatory and autoimmune diseases. Increased levels of proteasome activity correlate with disease activity and have been implicated in autoimmune diseases including systemic lupus erythematosus and rheumatoid arthritis. The proteasome is also involved in Intracellular antibody-mediated proteolysis of antibody-bound virions. In this neutralisation pathway, TRIM21 (a protein of the tripartite motif family) binds with immunoglobulin G to direct the virion to the proteasome where it is degraded.
=== Health === In 1934, at the age of 24, Dorothy began experiencing pain in her hands causing them to become swollen and distorted. She was diagnosed with rheumatoid arthritis, and went to a clinic in Buxton for thermal baths and gold treatments. After some treatment, Hodgkin returned to the lab, where she struggled to use the main switch on the x-ray equipment due to the condition of her hands. She had to create a lever on her own in order to operate the switch. Her condition would become progressively worse and debilitating over time, with deformities in both her hands and feet, and prolonged periods of pain. While Hodgkin spent a great deal of time in a wheelchair in her later years, she remained scientifically active in her career.
Sources: en.wikipedia.org
=== Into Germany === After helping to secure the Ruhr, the 82nd Airborne Division took over Ludwigslust past the Elbe River, accepting the surrender of over 150,000 men of Lieutenant General Kurt von Tippelskirch's 21st Army on 2 May 1945. General Omar Bradley, commanding the US 12th Army Group, stated in a 1975 interview with Gavin that Field Marshal Sir Bernard Montgomery, commanding the Anglo-Canadian 21st Army Group, had told him that German opposition was too great to cross the Elbe. When Gavin's 82nd crossed the river, in company with the British 6th Airborne Division, the 82nd Airborne Division moved 36 miles in one day and captured over 100,000 troops, causing great laughter in Bradley's 12th Army Group headquarters.
A U.S. court rejected the lawsuit blaming UCC for causing soil and water pollution around the site of the plant and ruled that responsibility for remedial measures or related claims rested with the State Government and not with UCC. In 2005, the state government invited various Indian architects to enter their "concept for development of a memorial complex for Bhopal gas tragedy victims at the site of Union Carbide". In 2011, a conference was held on the site, with participants from European universities which was aimed for the same.
=== Types of microneedle === There are many types of microneedle that are distinguished by the shape and other characteristics. The types include: Dissolvable MNPs, solid non-soluble MNPs, and hollow MNPs. Different MNPs may be chosen depending on the situation and the drug properties.
== G == GC-MS – Gas chromatography-mass spectrometry GDMS – Glow discharge mass spectrometry GDOS – Glow discharge optical spectroscopy GISAXS – Grazing incidence small angle X-ray scattering GIXD – Grazing incidence X-ray diffraction GIXR – Grazing incidence X-ray reflectivity GLC – Gas-liquid chromatography GPC – Gel permeation chromatography
Sources: en.wikipedia.org
指同一个分子能激活 GIP、GLP-1 和胰高血糖素三类受体。它与只激活一到两种受体的同类分子在设计思路上有所区别。这种设计的目的在于覆盖更多代谢调节通路。
天然肽类在体内容易被酶解并快速清除。脂肪酸侧链与非天然氨基酸可以延缓清除、降低酶解速率。修饰后的分子因此更适合较长间隔的给药安排。
公开资料主要来自临床阶段的报告与注册平台记录。这些材料提供的是阶段性信息，而非最终结论。完整的安全性与有效性数据仍在积累中。
Retatrutide is an investigational synthetic peptide that activates three metabolic receptors: GLP-1, GIP, and glucagon. It is being studied for obesity and type 2 diabetes. It has not been approved for clinical use.