This is a working overview of 肠促胰素, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-06-26 and is reviewed periodically as new material appears.
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.
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.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Receptor targets | GIP, GLP-1, glucagon | One molecule activates all three pathways |
| Research identifier | LY3437943 | Code used in published trial reports |
| Development stage | Phase 3, reported as ongoing | Not approved by any regulatory agency |
| Route studied | Subcutaneous | Administration form used in clinical trials |
| Studied populations | Adults with obesity or type 2 diabetes | Enrollment criteria vary between trials |
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.
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.
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.
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 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。
To avoid the deep disagreements surrounding the theories of the essential features of well-being, some researchers examine components and contributing factors, independent of whether they are integral parts or external causes. For example, there is wide agreement that positive emotions, achievements, interpersonal relationships, and health typically contribute to well-being in some form, despite academic disagreement about their precise roles.
Glucose enters the β-cells through the glucose transporters, GLUT 2. At low blood sugar levels little glucose enters the β-cells; at high blood glucose concentrations large quantities of glucose enter these cells. The glucose that enters the β-cell is phosphorylated to glucose-6-phosphate (G-6-P) by glucokinase (hexokinase IV) which is not inhibited by G-6-P in the way that the hexokinases in other tissues (hexokinase I – III) are affected by this product. This means that the intracellular G-6-P concentration remains proportional to the blood sugar concentration. Glucose-6-phosphate enters glycolytic pathway and then, via the pyruvate dehydrogenase reaction, into the Krebs cycle, where multiple, high-energy ATP molecules are produced by the oxidation of acetyl CoA (the Krebs cycle substrate), leading to a rise in the ATP:ADP ratio within the cell. An increased intracellular ATP:ADP ratio closes the ATP-sensitive SUR1/Kir6.2 potassium channel (see sulfonylurea receptor). This prevents potassium ions (K+) from leaving the cell by facilitated diffusion, leading to a buildup of intracellular potassium ions. As a result, the inside of the cell becomes less negative with respect to the outside, leading to the depolarization of the cell surface membrane. Upon depolarization, voltage-gated calcium ion (Ca2+) channels open, allowing calcium ions to move into the cell by facilitated diffusion. The cytosolic calcium ion concentration can also be increased by calcium release from intracellular stores via activation of ryanodine receptors.
Injection, also known as "slamming", "banging", "shooting up", "digging" or "mainlining", is a popular method which carries relatively greater risks than other methods of administration. Heroin base (commonly found in Europe), when prepared for injection, will only dissolve in water when mixed with an acid (most commonly citric acid powder or lemon juice) and heated. Heroin in the east-coast United States is most commonly found in the hydrochloride salt form, requiring just water (and no heat) to dissolve. Users tend to initially inject in the easily accessible arm veins, but as these veins collapse over time, users resort to more dangerous areas of the body, such as the femoral vein in the groin. Some medical professionals have expressed concern over this route of administration, as they suspect that it can lead to deep vein thrombosis. Intravenous users can use a variable single dose range using a hypodermic needle. The dose of heroin used for recreational purposes is dependent on the frequency and level of use. As with the injection of any drug, if a group of users share a common needle without sterilization procedures, blood-borne diseases, such as HIV/AIDS or hepatitis, can be transmitted. The use of a common dispenser for water for the use in the preparation of the injection, as well as the sharing of spoons and filters can also cause the spread of blood-borne diseases. Many countries now supply small sterile spoons and filters for single use in order to prevent the spread of disease.
== Classes of attenuators == Attenuators may be classified according to the type of molecule which induces the change in RNA structure. It is likely that transcription-attenuation mechanisms developed early, perhaps prior to the archaea/bacteria separation and have since evolved to use a number of different sensing molecules (the tryptophan biosynthetic operon has been found to use three different mechanisms in different organisms.)
=== Primordial synthesis === The formation of amino acids and peptides is assumed to have preceded and perhaps induced the emergence of life on earth. Amino acids can form from simple precursors under various conditions. Surface-based chemical metabolism of amino acids and very small compounds may have led to the build-up of amino acids, coenzymes and phosphate-based small carbon molecules. Amino acids and similar building blocks could have been elaborated into proto-peptides, with peptides being considered key players in the origin of life.
Sources: en.wikipedia.org
=== Psychotherapy === Ibogaine was used as an adjunct to psychotherapy by Claudio Naranjo, documented in his 1973 book The Healing Journey: New Approaches to Consciousness. He was awarded patent in 1974.
=== Functional and bioactive components === Among the functional proteins detected in donkey milk, there are molecules active in antimicrobial protection such as lysozyme and lactoferrin. The lactoferrin content of donkey milk is intermediate between the lower values of cow milk and the higher values of human milk. Lactoferrin inhibits the growth of iron-dependent bacteria in the gastrointestinal tract. This inhibits certain organisms, such as coliforms and yeast, that require iron. Lysozyme in donkey milk is present in large amounts, and ranges from 1.0 mg/mL to 4 mg/mL, depending on the analytical method used (chemical or microbiological); This substance is present also in humans (0.12 mg/mL) but only in trace amounts in cow and goat milk. Lysozyme in donkey milk is highly thermo-stable and is very resistant to acid and protease and may play a significant role in the intestinal immune response. In donkey mammary secretion, defatted or not, growth factors and hormones have also been determined. Donkey mammary secretions contain human-like leptin at levels close to human milk (3.35 e 5.32 ng/mL milk). The bioactive peptides insulin-like growth factor 1, ghrelin, and triiodothyronine were also found in frozen donkey milk. These molecules and many others present in human milk, are increasingly receiving attention from a nutraceutical point of view because of their potential direct role in regulating food intake, metabolism, and infant body condition.
Singapore — The death penalty: A hidden toll of executions from Amnesty International The Singapore Government's Response To Amnesty International's Report from 30 January 2004 Asia Death Penalty monitors the death penalty in Asia, including in Singapore Singapore: Death Penalty Worldwide Academic research database on the laws, practice, and statistics of capital punishment for every death penalty country in the world.
Gentle cleansing and coverage of the wound with antibiotic ointment or petrolatum is recommended until sutures are removed in instances of primary closure or local flap repairs. Depending on varying factors such as tension of the wound, anatomic site, and personal patient factors, this usually occurs 5-14 days after the operation. On the other hand, immobilization and non-adherent dressings may be required for skin grafts. This is more intensive postoperative care, and better outcomes in select locations, like on the nose or foot, are associated with delayed grafting. For certain areas of the body, like the concave surface of the ear, secondary intention healing (SIH) may be the best option for healing as it is associated with good cosmetic outcomes and lower complications in the appropriate cases. SIH involves leaving the wound to heal naturally, by itself, with no intervention (including no stitches or grafts). The wound heals while the patient monitors for healthy tissue formation and keeps the area clean with dressing changes. To reduce the risk of bleeding, patients are generally advised not to carry over 10 pounds of weight and avoid excessive physical activity for 2-3 days after the procedure. Minor complications (outlined above in the Risks and Complications section) rarely occur and patients are usually able to continue their normal activity within days of the operation.
Sources: en.wikipedia.org
The 43,000-year-old Divje Babe flute (a cave bear femur) from Slovenia has been attributed by some researchers to Neanderthals, though its status as a Palaeolithic flute is heavily disputed. Many researchers consider it to be most likely the product of a carnivorous animal chewing the bone.
=== FDA warning letters === Over the period of 2021–2023, the US FDA issued warning letters to manufacturers of ginkgo dietary supplements for false advertising about health claims and misbranding of their products as non-approved drugs.
==== Attention deficit hyperactivity disorder ==== Modafinil is occasionally prescribed off-label for individuals with attention deficit hyperactivity disorder (ADHD). It has not consistently shown efficacy in treating adult ADHD, especially when compared to other treatments such as lisdexamfetamine. In children, modafinil shows efficacy for ADHD symptoms in clinical trials, though it is less effective than first-line treatments such as methylphenidate and amphetamines. Modafinil was investigated for ADHD because of its lower abuse potential than conventional psychostimulants, but evidence for adult ADHD is mixed. A 2016 systematic review did not recommend its use, and a large Phase III trial found modafinil ineffective with a high rate of side effects (86%) and discontinuation (47%), possibly due to high doses (210–510 mg/d). A 2008 US Food and Drug Administration application for pediatric ADHD was denied due to concerns about rare but serious dermatological toxicity. Modafinil is considered a second-line treatment for comorbid ADHD and bipolar disorder, after psychostimulants and bupropion.
=== 25 April === At least 11 people were killed in an RSF drone strike in Atbara that hit a displaced persons camp and energy facilities. RSF shelling from Salha in Omdurman hit the SAF's general headquarters in Khartoum.
The Association for Laboratory Medicine (previously the Association for Clinical Biochemistry and Laboratory Medicine) is a United Kingdom-based learned society dedicated to the practice and promotion of laboratory medicine which consists of the clinical biochemistry, immunology and microbiology professions. It was founded on 28 March 1953 at the inaugural meeting attended by 75 members at the Hammersmith Hospital in London, and its official journal is the Annals of Clinical Biochemistry. The association is a full, national society member of the International Federation of Clinical Chemistry and Laboratory Medicine IFCC as well as a full member of the regional European Federation of Clinical Chemistry and Laboratory Medicine. Its qualifying members are automatically members of the certificated trade union called Federation of Clinical Scientists (FCS), which represents the interests of clinical scientists. Some members who meet the eligibility criteria are enrolled to the register of European Specialists in Laboratory Medicine (EuSpLM).
Sources: en.wikipedia.org
It is a synthetic peptide triagonist that engages GIP, GLP-1, and glucagon receptors. Investigational compounds in this class are studied for metabolic conditions rather than for a single organ system.
No regulatory agency has approved it for any indication. It remains an investigational product studied within controlled clinical trial programs.
A dual agonist engages two receptor targets, typically GIP and GLP-1. A triagonist adds glucagon receptor activity, which is intended to influence energy expenditure alongside appetite and glucose handling.
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.