Everything below concerns 肽类药物. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
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。
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.
| 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 |
Dissolution behavior depends on the amino acid sequence, the counterion content, and the buffer chosen. Many peptides disperse readily in water or mild aqueous buffers, while others require a small amount of organic co-solvent or a change in pH. Adsorption to plastic and glass surfaces can reduce the concentration of a solution over time, particularly at low concentrations. Filtration before analysis removes particulates, and aliquoting limits repeated freeze-thaw cycles that stress the material.
Research-grade peptide material is commonly supplied as a lyophilized powder, a form that limits degradation during transport and storage. Standard practice keeps such material cold and protected from light and moisture, with tighter conditions used for long-term archives. Once dissolved, solutions are generally considered less stable than the dry powder and are handled on shorter timescales. These established conventions derive largely from general peptide chemistry rather than from compound-specific evidence alone.
Human evidence remains limited to controlled studies. A phase 2 trial in adults with obesity reported large, dose-dependent reductions in body weight over 48 weeks, with gastrointestinal events as the most frequently recorded adverse effect. Phase 3 programs designated TRIUMPH, for obesity, and TRANSCEND, for type 2 diabetes, are intended to confirm efficacy and to characterize safety in larger populations. Related studies are examining conditions such as knee osteoarthritis in people with obesity and metabolic liver disease. Open questions include long-term tolerability, effects on lean mass, and what happens after treatment is stopped.
Retatrutide is an investigational synthetic peptide that acts on three receptor targets at once: glucose-dependent insulinotropic polypeptide, glucagon-like peptide-1, and glucagon. It is developed by Eli Lilly and appears in the literature and in trial registries under the code LY3437943. The molecule belongs to a class of engineered peptides designed to resist rapid breakdown and permit infrequent subcutaneous administration. No regulatory agency has approved it for clinical use, and all available human data come from controlled trials rather than from routine practice.
The intended pharmacology combines three signals in one molecule. GLP-1 receptor activation reduces appetite and slows gastric emptying, effects already exploited by approved incretin-based therapies. GIP receptor engagement is associated with improved insulin sensitivity and with direct effects on adipose tissue, although how much it contributes to overall outcomes is still debated. Glucagon receptor agonism raises energy expenditure and supports hepatic lipid handling, a mechanism that also tends to increase glucose output. The triple profile is hypothesized to produce a larger metabolic effect than single or dual agonism, but the relative weight of each receptor in humans is not settled.
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.
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.
供应环节涉及来源核实与文件审核两类工作。分析证书、批次记录以及第三方检测报告构成常见的可追溯材料。来源不清的样品很难确认身份与纯度，因此核实步骤在实际操作中具有明确意义。缺少方法细节的报告通常无法复核。
多肽类化合物的表征通常依赖色谱与质谱联用技术。反相高效液相色谱用于评估纯度与有关物质，质谱用于确认分子量，肽图分析通过酶解碎片比对验证一级结构。这些手段组合使用，可以把目标产物与降解产物或类似物区分开来。单一方法往往不足以完成完整确认。
=== Legal status === In January 2016, Eli Lilly submitted a new drug application to the US Food and Drug Administration (FDA) for the approval of baricitinib to treat moderately-to-severely active rheumatoid arthritis. In December 2016, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) recommended the approval of baricitinib as a therapy for rheumatoid arthritis. European Union approval was granted in February 2017. Despite widespread expectations that the FDA would approve baricitinib for rheumatoid arthritis, in April 2017, the FDA issued a rejection, citing concerns about dosing and safety. In May 2018, baricitinib was approved in the United States for the treatment of rheumatoid arthritis. In March 2020, the US FDA granted breakthrough therapy designation to baricitinib for the treatment of alopecia areata and granted approval in June 2022. The efficacy and safety of baricitinib in alopecia areata was studied in two randomized, double-blind, placebo-controlled trials (Trial AA-1 and Trial AA-2) with participants who had at least 50% scalp hair loss as measured by the Severity of Alopecia Tool (SALT) for more than six months. Participants in these trials received either a placebo, 2 milligrams of baricitinib, or 4 milligrams of baricitinib every day. The primary measurement of efficacy for both trials was the proportion of participants who achieved at least 80% scalp hair coverage at week 36.
A university reports on the first study (25 Oct) of the new privacy-intrusion Web tracking technique of "UID smuggling" by the ad industry, which finds it to be prevalent and largely not mitigated by latest protection tools – such as Firefox's tracking protection and uBlock Origin – and contributes to countermeasures. 15 December Astronomers find that a pair of exoplanets orbiting the red dwarf star Kepler-138 are likely to be water worlds. News reports about the development (22 Oct) in China of an edible, plant-based ink derived from food waste, which could be used in 3D printing of scaffolds to reduce the cost of cultured meat. Promising results of therapeutic candidates are reported: phase 2-trialed talquetamab against multiple myeloma (10&15 Dec), a phase 1-trialed HIV vaccine (2 Dec), mice-tested Pillar[6]MaxQ against meth and fentanyl drug overdoses (15 Dec), first approval of a trialed honeybee vaccine against American foulbrood (29 Dec), a mice-tested triple combination therapy against pancreatic cancer of immunotherapy medications undergoing trials as monotherapies (30 Dec). 19 December – A new world record solar cell efficiency for a silicon-perovskite tandem solar cell is achieved, with scientists in Germany converting 32.5% of sunlight into electrical energy. 20 December – OpenAI releases Point-E, a machine learning system that can generate 3D models from text prompts (text-to-3D), similar to previously released GET3D and Magic3D by Nvidia and DreamFusion by Google.
== Plate production == TLC plates are usually commercially available, with standard particle size ranges to improve reproducibility. They are prepared by mixing the adsorbent, such as silica gel, with a small amount of inert binder like calcium sulfate (gypsum) and water. This mixture is spread as a thick slurry on an unreactive carrier sheet, usually glass, thick aluminum foil, or plastic. The resultant plate is dried and activated by heating in an oven for thirty minutes at 110 °C. The thickness of the absorbent layer is typically around 0.1–0.25 mm for analytical purposes and around 0.5–2.0 mm for preparative TLC. Other adsorbent coatings include aluminium oxide (alumina), or cellulose.
Mimoun "Rocky" Kaabouni, who was nicknamed "The Moroccan Escobar", was born in Ben Taïeb, a village in the province of Nador. He grew up in Hoensbroek, in the Netherlands, where he and his brother owned a coffeeshop named Happy Days. While often visiting Amsterdam, he eventually started meeting big names within the Moroccan mafia with whom he maintained regular contact. Mimoun left the Netherlands for southern Spain and Romania, where he founded his own criminal organisation made up of Lithuanians and Colombians. Mimoun, who was already bringing in tons of cocaine through the ports of Antwerp, Rotterdam, Amsterdam, and Algeciras, wanted to create a new route in Romania through the port of Constanța. He is currently serving a 19-year prison sentence in Romania for a record seizure of 2.5 tons of cocaine (the biggest seizure of cocaine in the country's history). Mimoun was arrested in 2016 when he tried to leave Spain through the Málaga Airport after the seizure in Romania, which was worth €600 million. It was one of the largest drug seizures in Eastern European history.
=== Analysis === The interaction between metal ions and peptides are typically studied in solution using spectroscopic or electrochemical methods. Amongst which are circular dichroism (CD), nuclear magnetic resonance (NMR) spectroscopy, cyclic voltammetry, and mass spectrometry (MS).
Sources: en.wikipedia.org
=== Effects during pregnancy === During human pregnancy, increased fetal production of cortisol between weeks 30 and 32 initiates production of fetal lung pulmonary surfactant to promote maturation of the lungs. In fetal lambs, glucocorticoids (principally cortisol) increase after about day 130, with lung surfactant increasing greatly, in response, by about day 135, and although lamb fetal cortisol is mostly of maternal origin during the first 122 days, 88% or more is of fetal origin by day 136 of gestation. Although the timing of fetal cortisol concentration elevation in sheep may vary somewhat, it averages about 11.8 days before the onset of labor. In several livestock species (e.g. cattle, sheep, goats, and pigs), the surge of fetal cortisol late in gestation triggers the onset of parturition by removing the progesterone block of cervical dilation and myometrial contraction. The mechanisms yielding this effect on progesterone differ among species. In the sheep, where progesterone sufficient for maintaining pregnancy is produced by the placenta after about day 70 of gestation, the prepartum fetal cortisol surge induces placental enzymatic conversion of progesterone to estrogen. (The elevated level of estrogen stimulates prostaglandin secretion and oxytocin receptor development.) Exposure of fetuses to cortisol during gestation can have a variety of developmental outcomes, including alterations in prenatal and postnatal growth patterns.
=== Types of sutures === Serrate sutures – similar to a denticulate suture but the interlocking regions are serrated rather than square. Eg: Coronal suture, sagittal Sutures. Plane sutures – edges of the bones are flush with each other as in a normal butt joint. Eg: Internasal suture. Limbous sutures – edges are bevelled so the plane of the suture is sloping as in a mitre joint. Eg: Temporo-parietal suture. Schindylesis – formed by two bones fitting into each other similar to a bridle joint. Eg: Palatomaxillary suture. Denticulate sutures – the edges slot into each other as in a finger joint. Eg: Lambdoid suture.
HMB is believed to reduce muscle protein breakdown in humans by inhibiting the 19S and 20S subunits of the ubiquitin–proteasome system in skeletal muscle and by inhibiting apoptosis of skeletal muscle nuclei via unidentified mechanisms. Based upon animal studies, HMB appears to be metabolized within skeletal muscle into cholesterol, which may then be incorporated into the muscle cell membrane, thereby enhancing membrane integrity and function. The effects of HMB on muscle protein metabolism may help stabilize muscle cell structure. One review suggested that the observed HMB-induced reduction in the plasma concentration of muscle damage biomarkers (i.e., muscle enzymes such as creatine kinase and lactate dehydrogenase) in humans following intense exercise may be due to a cholesterol-mediated improvement in muscle cell membrane function. HMB has been shown to stimulate the proliferation, differentiation, and fusion of human myosatellite cells in vitro, which potentially increases the regenerative capacity of skeletal muscle, by increasing the protein expression of certain myogenic regulatory factors (e.g., myoD and myogenin) and gene transcription factors (e.g., MEF2). HMB-induced human myosatellite cell proliferation in vitro is mediated through the phosphorylation of the mitogen-activated protein kinases ERK1 and ERK2. HMB-induced human myosatellite differentiation and accelerated fusion of myosatellite cells into muscle tissue in vitro is mediated through the phosphorylation of Akt, a serine/threonine-specific protein kinase.
Big Drawer II (ビグドローワー2, Bigu Dorōwā Tsū): A chest-of-drawers-themed Super Kaijuki that he uses in his smear campaign against the Dekarangers before it is destroyed by Deka Base Robo. Abtrex (アブトレックス, Abutorekkusu): Abrella's personal Kaijuki that can assume the Abtrailer (アブトレーラー, Abutorērā) drill-vehicle mode. He tasks the Alienizer Angorl with using it to attack the Deka Base and damage Dekaranger Robo before the Kaijuki is destroyed by Deka Bike Robo and the Deka Wing Cannon. During the events of the crossover film Mahō Sentai Magiranger vs. Dekaranger, Agent X pilots the succeeding model, Abotrex (アボトレックス, Abotorekkusu), before it is blasted into space by Magi Legend and the Deka Wing Cannon and destroyed by Magi King, Dekaranger Robo, Travelion, and Deka Bike Robo. Abrella is voiced by Ryūsei Nakao (中尾 隆聖, Nakao Ryūsei).
TikTok has taken measures to remove and prevent access to content displaying the trend. Another TikTok trend known as the Kia Challenge involves users stealing certain models of Kia and Hyundai cars manufactured without immobilizers, which was a standard feature at the time, between 2010 and 2021. As of February 2023, it had resulted in at least 14 crashes and eight deaths according to the National Highway Traffic Safety Administration. In May, Kia and Hyundai settled a $200-million class-action lawsuit by agreeing to provide software updates to affected vehicles and over 26,000 steering wheel locks. In 2023, a trend emerged where streamers acted as if they were video-game characters following prompts from their viewers. On Douyin, the Chinese version of TikTok, some celebrities who had garnered large followings as of August 2019 include Dilraba Dilmurat, Angelababy, Luo Zhixiang, Ouyang Nana, and Pan Changjiang. In the 2022 FIFA World Cup, a Qatari teenage royal became an Internet celebrity after his angry expressions were recorded in Qatar's opening match loss to Ecuador; he amassed more than 15 million followers in less than a week after creating a Douyin account. On Douyin, viral memes and parodies of North Korea's tightly choreographed state propaganda such as "general's dance" or "You came from Dandong" amassed millions of views in 2024. The memes have also spilled offline. In Dandong, visitors have filmed themselves reenacting exaggerated greeting gestures toward the Yalu River, set to the same soundtracks popularized on Douyin.
Sources: en.wikipedia.org
BACE1 is the major beta secretase for the generation of amyloid-β peptides in neurons. Generation of the 40 or 42 amino acid-long amyloid-β peptides that aggregate in the brain of Alzheimer's patients requires two sequential cleavages of the amyloid precursor protein (APP). Extracellular cleavage of APP by BACE1 creates a soluble extracellular fragment and a cell membrane-bound fragment referred to as C99. Cleavage of C99 within its transmembrane domain by γ-secretase releases the intracellular domain of APP and produces amyloid-β. Since gamma-secretase cleaves APP closer to the cell membrane than BACE1 does, it removes a fragment of the amyloid-β peptide. Initial cleavage of APP by α-secretase rather than BACE1 prevents eventual generation of amyloid-β, forming P3, this demonstrates that BACE1 and Alpha secretase compete for the APP processing. Unlike APP and the presenilin proteins important in γ-secretase, no known mutations in the gene encoding BACE1 cause early-onset, familial Alzheimer's disease, which is a rare form of the disorder. However, levels of this enzyme have been shown to be elevated in the far more common late-onset sporadic Alzheimer's. BACE2 is a close homolog of BACE1 with no reported APP cleavage in vivo. The physiological purpose of BACE's cleavage of APP and other transmembrane proteins is unknown: some studies observed that BACE1 is involved in myelination (it is co-express with neuregulin 1 type III). In a manner analogous to APP processing, the VGSC subunit beta is a substrate for BACE1.
SAS: Are You Tough Enough? (2002–2004). SAS: Who Dares Wins – Quasi-military training television reality programme which pits contestants against harsh environments in a two-week-long training course designed to replicate Special Air Service selection. Ultimate Force – ITV action drama series following the operations of the fictitious "Red Troop" of the Special Air Service (2002–2008). SAS: Rogue Heroes – BBC historical drama series which depicts the formation of the Special Air Service during World War II (2022). Video games featuring the SAS
== Dietary sources == Some foods considered rich in cysteine include poultry, eggs, beef, and whole grains. In high-protein diets, cysteine may be partially responsible for reduced blood pressure and stroke risk. Although classified as a nonessential amino acid, in rare cases, cysteine may be essential for infants, the elderly, and individuals with certain metabolic diseases or who suffer from malabsorption syndromes. Cysteine can usually be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available through the transsulfuration pathway.
ATC code G Genito-urinary system and sex hormones is a section of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products. Codes for veterinary use (ATCvet codes) can be created by placing the letter Q in front of the human ATC code: for example, QG. ATCvet codes without corresponding human ATC codes are cited with the leading Q in the following list.National versions of the ATC classification may include additional codes not present in this list, which follows the WHO version.
== Causes == In July 2017 Live Science reported Romain Pizzi, the specialist wildlife veterinary surgeon at the Scottish Society for the Prevention of Cruelty to Animals (Scottish SPCA), saying that, "Hedgehogs have a little windpipe that runs from their mouth and nose to their lungs, and at the top of this windpipe is the glottis, which opens and closes as hedgehogs breathe. [...] If a hedgehog is struck when that glottis is open, air simply flows out of the lungs and out of the body. But if the glottis is closed when the animal is struck, that air has nowhere to go, and the lung tissue can rupture. It's like a balloon popping. [...] This trauma can also cause damage to the muscles in between a hedgehog's ribs". Live Science added that "the ruptures in the lungs and rib muscles [according to Pizzi] 'act like a one-way valve,' so air can flow out of the lungs and into the body cavity—but not back in. So, with each breath the hedgehog takes, a bit of air leaks out, causing the hedgehog to inflate itself. [...] Pizzi noted that the tissue under a hedgehog's skin isn't designed to be filled with air, so it's not one big open compartment. Instead, there is a lot of connective tissue under the skin, sectioning areas off into little compartments of air. Though it's called balloon syndrome, in most cases the hedgehogs 'puff up more like Bubble Wrap,' he said".
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。
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.