The short version of 胃饥饿素受体 fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-04-18. Anything still debated is marked as such rather than presented as settled.
The compound was developed at Novo Nordisk during the 1990s as part of a programme seeking secretagogues with improved selectivity. It was described in the peer-reviewed literature in 1998 alongside related pentapeptides from the same series. Investigators advanced it because it raised growth hormone output in animal models while leaving other pituitary hormones comparatively unaffected. The development code NNC 26-0161 appears in earlier reports, and ipamorelin later became the common designation in published work.
Selectivity is the property most often attached to this peptide. Published animal and early human studies record increases in growth hormone release after administration, with adrenocorticotropic hormone and cortisol responses remaining small by comparison. Effects on appetite-related pathways also appear weaker than those reported for several earlier secretagogues. Reviews that compare members of the growth hormone secretagogue family cite these findings frequently, though the receptor-level explanation for the selectivity continues to be debated rather than settled.
Ipamorelin 是一种合成五肽，在 20 世纪 90 年代被报道为生长激素促分泌剂。其结构基于胃饥饿素受体激动剂的设计思路，但并非天然激素。早期药理学研究显示，它可刺激垂体释放生长激素，而对应激激素轴的影响相对较小。该化合物常被用作研究生长激素调节通路的工具分子。
在机制层面，ipamorelin 与生长激素促分泌受体 1a 型结合，该受体也介导胃饥饿素的多种效应。受体激活后，细胞内信号促进生长激素从垂体前叶释放。由于对促肾上腺皮质激素和皮质醇的刺激较弱，它被视为选择性较高的促分泌剂。这种选择性在动物模型和少量人体研究中被观察到，但人体数据仍然有限。
现有文献多来自小规模、短期的研究，涉及生长激素缺乏、术后肠麻痹等方向。长期使用是否导致受体脱敏，以及重复给药后效应是否衰减，仍属开放问题。不同研究之间的剂量、给药途径和受试者特征差异较大，因此结论外推需谨慎。关于临床获益的确切证据尚不充分，需要更大规模的对照试验来澄清。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C38H49N9O5 | Pentapeptide with C-terminal amide |
| Average mass | Approximately 711.9 Da | Value derived from the formula |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water and aqueous acetonitrile | Dissolution aided by acidic diluents |
| Common synonyms | Ipamorelin; NNC 26-0161 | Code name used in early reports |
Signal transduction begins when the peptide binds GHSR-1a on pituitary somatotrophs. The receptor couples to Gq/11 proteins, activating phospholipase C, which cleaves phosphatidylinositol bisphosphate into inositol trisphosphate and diacylglycerol. Inositol trisphosphate releases calcium from intracellular stores, and the resulting rise in cytosolic calcium drives growth hormone vesicle fusion. Concurrent Gs coupling and cyclic AMP elevation have also been reported, and the relative contribution of each arm to the overall secretory response is not fully settled.
Structural features distinguish the molecule from earlier secretagogues. An alpha-aminoisobutyric acid residue near the N-terminus and a D-naphthylalanine substitution increase receptor affinity, while C-terminal amidation improves resistance to exopeptidases. These modifications are associated with reduced stimulation of appetite and of the hypothalamic-pituitary-adrenal axis compared with hexarelin or growth hormone releasing peptide-6. Whether the same profile applies at every dose level studied is a matter of ongoing investigation rather than settled consensus.
Ipamorelin is a synthetic pentapeptide that acts as an agonist at the ghrelin receptor, also called the growth hormone secretagogue receptor type 1a. Its sequence incorporates non-natural residues, which slows enzymatic breakdown relative to short native peptides. In laboratory and early clinical work the compound is described as a selective growth hormone secretagogue because it raises growth hormone with comparatively little effect on other pituitary outputs. The degree to which that selectivity holds across species and dosing regimens remains an open question in the published literature.
Analytical confirmation relies on reversed-phase high-performance liquid chromatography, often coupled to mass spectrometry for identity and purity assessment. Mass spectrometry distinguishes the intact molecule from truncation products and from oxidation or deamidation variants that share similar chromatographic retention. Immunoassays appear in some biological studies but can cross-react with related peptides, so they are weaker tools for identity work. Reported purity figures depend heavily on the gradient, detector, and integration method used, which complicates direct comparison between laboratories.
Research quantities of ipamorelin are typically distributed as a white to off-white lyophilized powder. The solid dissolves readily in water and in aqueous buffers, and stock solutions are commonly prepared in sterile water or a mildly acidic diluent. Adsorption to plastic and glass surfaces can reduce the concentration of very dilute solutions, so containers and transfer steps deserve attention when accurate concentrations matter. Reconstituted material is generally used promptly rather than held for extended periods.
Storage recommendations for the dry solid center on low temperature and low moisture, most often -20 °C in a sealed, desiccated container protected from light. Solutions are less stable than the powder and are usually kept cold and used within a short window. Freeze-thaw cycling is a recognized source of loss, and aliquoting before freezing is a standard precaution. These practices derive from general peptide handling principles rather than from a single published stability trial, so exact shelf lives should be treated as approximate.
On 24 February 1991 the 1st Cavalry Division fired its artillery against Iraqi artillery units. One artillery mission struck a series of Iraqi bunkers, reinforced by Iraqi T-55 tanks, in the sector of the Iraqi 25th Infantry Division. The same day the 2nd Brigade, 1st Cavalry Division with the 1st Battalion, 5th Cavalry, 1st Battalion, 32nd Armor, and the 1st Battalion, 8th Cavalry destroyed Iraqi bunkers and combat vehicles in the sector of the Iraqi 25th Infantry Division. On 24 February 2nd Brigade, 1st Infantry Division rolled through the breach in the Iraqi defense west of Wadi al-Batin and also cleared the northeastern sector of the breach site of enemy resistance. Task Force 3–37th Armor breached the Iraqi defense clearing four passage lanes and expanding the gap under direct enemy fire. Also on 24 February the 1st Infantry Division along with the 1st Cavalry Division destroyed Iraqi outposts and patrols belonging to the Iraqi 26th Infantry Division. The two divisions also began capturing prisoners. The 1st Infantry Division cleared a zone between Phase Line Vermont and Phase Line Kansas. Once the 1st Infantry Division's 3rd Battalion, 37th Armor reached the Iraqi rear defensive positions it destroyed an Iraqi D-30 artillery battery and many trucks and bunkers. Task Force 1–41 Infantry was given the task of breaching Iraq's initial defensive positions along the Iraq–Saudi Arabia border. The 1st Squadron, 4th Armored Cavalry Regiment handled similar responsibilities in its sector of operations.
These bound antibody/antigen complexes are then added to an antigen-coated well. The plate is washed, so unbound antibodies are removed. (The more antigen in the sample, the more Ag-Ab complexes are formed and so there are less unbound antibodies available to bind to the antigen in the well, hence "competition".) The secondary antibody, specific to the primary antibody, is added. This second antibody is coupled to the enzyme. A substrate is added, and remaining enzymes elicit a chromogenic or fluorescent signal. The reaction is stopped to prevent eventual saturation of the signal. Some competitive ELISA kits include enzyme-linked antigen rather than enzyme-linked antibody. The labeled antigen competes for primary antibody binding sites with the sample antigen (unlabeled). The less antigen in the sample, the more labeled antigen is retained in the well and the stronger the signal. Commonly, the antigen is not first positioned in the well. For the detection of HIV antibodies, the wells of microtiter plate are coated with the HIV antigen. Two specific antibodies are used, one conjugated with enzyme and the other present in serum (if serum is positive for the antibody). Cumulative competition occurs between the two antibodies for the same antigen, causing a stronger signal to be seen. Sera to be tested are added to these wells and incubated at 37 °C, and then washed. If antibodies are present, the antigen-antibody reaction occurs. No antigen is left for the enzyme-labelled specific HIV antibodies. These antibodies remain free upon addition and are washed off during washing.
Not only is the monolith column more economically prudent when considering the value of product processing times, but, at the same time, less media is used, representing a significant reduction in variable costs.
Sources: en.wikipedia.org
== Objective == Grameen Danone Foods aims to reduce poverty by creating business and employment opportunities for local people since raw materials including milk needed for production, will be sourced locally. The companies that make up Grameen Danone Foods Ltd. have agreed not to take out any of the profits out of the company. Instead they will invest these for creation of new opportunities for the welfare and development of people. Hence it is called 'social business enterprise'.
Hoffman alleged Edwards employed monopoly practices in breach of the Sherman Act because it had 70% share of the integrated vacuum pump frame systems market in the US and suppressed competition, imposing non-compete covenants on its suppliers and engaged in employee intimidation; customer threats, and bad faith litigation. In May 2021, Edwards was granted a partial, interim injunction against Hoffman selling a bellows component. Judgement declined to accept Edwards' application of Noerr–Pennington doctrine to dismiss Hoffman's anti competition counterclaim. In June 2022, the parties entered into a Confidential Settlement Agreement through which both parties' claims were dismissed with prejudice.
== Biological role == Alkaloids are among the most important and best-known secondary metabolites, i.e. biogenic substances not directly involved in the normal growth, development, or reproduction of the organism. Instead, they generally mediate ecological interactions, which may produce a selective advantage for the organism by increasing its survivability or fecundity. In some cases their function, if any, remains unclear. An early hypothesis, that alkaloids are the final products of nitrogen metabolism in plants, as urea and uric acid are in mammals, was refuted by the finding that their concentration fluctuates rather than steadily increasing. Most of the known functions of alkaloids are related to protection. For example, aporphine alkaloid liriodenine produced by the tulip tree protects it from parasitic mushrooms. In addition, the presence of alkaloids in the plant prevents insects and chordate animals from eating it. However, some animals are adapted to alkaloids and even use them in their own metabolism. Such alkaloid-related substances as serotonin, dopamine and histamine are important neurotransmitters in animals. Alkaloids are also known to regulate plant growth. One example of an organism that uses alkaloids for protection is the Utetheisa ornatrix, more commonly known as the ornate moth. Pyrrolizidine alkaloids render these larvae and adult moths unpalatable to many of their natural enemies like coccinelid beetles, green lacewings, insectivorous hemiptera and insectivorous bats.
A follow-up analysis, and a letter to the editor by Gregory Francis from the Department of Psychological Sciences, Purdue University, demonstrated that the problem in the paper could be a simple reporting error in which t-statistics were reported as F-statistics by mistake. Francis also showed that this error does not negate the findings in the original article. In November 2022, the Israeli TV investigative show Hamakor (Channel 13), aired an episode questioning a number of Ariely's studies that were not reproducible or whose reliability was dubious in terms of the way they were carried out, the data collected, or whether the studies were carried out at all. For example, Ariely claimed that data for his "Ten Commandments" study were collected in 2004–2005 at UCLA with the assistance of Aimee Drolet Rossi. However, despite being thanked in the 2004 paper for collecting the data almost 20 years later, Rossi denies having run the study, and UCLA has issued a statement that the study did not take place there. Ariely told The New Yorker that the surveys were collected at UCLA but processed by an assistant at MIT, a mixup that he credited for the confusion surrounding Rossi and UCLA's role in the study. An analysis conducted by the American Marketing Association on the study in question found that the study's results were largely replicable using the data provided by the authors, although conditions had been dropped from the first two experiments in the study.
Sources: en.wikipedia.org
strongly acidic cation (SAC), typically featuring sulfonic acid groups, e.g. sodium polystyrene sulfonate or polyAMPS, often used for water softening and demineralization operations. strongly basic anion (SBA), typically featuring quaternary amino groups, for example, trimethylammonium groups, e.g. polyAPTAC), good for silica, uranium, nitrates removal. weakly acidic cation (WAC), typically featuring carboxylic acid groups. An ideal choice for dealkalization part and also for softening streams with high salinity levels. weakly basic anion (WBA), typically featuring primary, secondary, and/or tertiary amino groups, e.g. polyethylene amine. Are effective for demineralization where removal of SiO2 and CO2 are not required. Also effective for acid absorption. Specialised ion-exchange resins are also known such as chelating resins (iminodiacetic acid, thiourea-based resins, and many others). Anion resins and cation resins are the two most common resins used in the ion-exchange process. While anion resins attract negatively charged ions, cation resins attract positively charged ions.
deuterium Also hydrogen-2 or heavy hydrogen, and symbolized 2H or D. One of two stable isotopes of a hydrogen atom, the nucleus of which contains one proton and one neutron. Deuterium is both heavier and much less abundant in nature than the other stable isotope, known as protium (1H).
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic consisting of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States also asserts sovereignty over five major island territories and various uninhabited islands in Oceania and the Caribbean. It is a megadiverse country, with the world's fourth-largest total area and third-largest population, exceeding 341 million. Paleo-Indians migrated from North Asia to North America at least 15,000 years ago and formed various civilizations. Beginning in 1607, British colonization established the Thirteen Colonies. The 18th-century American Enlightenment spread values of republicanism and liberalism there, and clashes with the British Crown over taxation without parliamentary representation, among other denied rights, sparked the American Revolution. Independence from Great Britain was formally declared in the Lee Resolution of July 2, 1776, two days before the Declaration of Independence. Victory in the 1775–1783 Revolutionary War brought international recognition of U.S. sovereignty. The U.S. expanded westward through the purchase, settlement, and conquest of European- and Indigenous-controlled territory.
Other tools include DocFinder at docfinder.docboard.org and certificationmatters.org from the American Board of Medical Specialties. In some cases more information is available from a mailed or walk-in request than the internet; for example, the Medical Board of California removes dismissed accusations from website profiles, but these are still available from a written or walk-in request, or a lookup in a separate database. The trend to disclosure is controversial and generate significant public debate, particularly about opening up the National Practitioner Data Bank. In 1996, Massachusetts became the first state to require detailed disclosure of malpractice claims.
=== Bradycardia or AV block === Unless a pacemaker is present, beta blockers can severely depress conduction in the AV node, resulting in a reduction of heart rate and cardiac output. One should be very cautious with the use of beta blockers in tachycardia patients with Wolff-Parkinson-White Syndrome, as it can result in life-threatening arrhythmia in certain patients. By slowing the conduction through the AV node, preferential conduction through the accessory pathway is favored. If the patient happens to develop atrial flutter, this could lead to a 1:1 conduction with very fast ventricular rate, or worse, ventricular fibrillation in the case of atrial fibrillation.
Sources: en.wikipedia.org
It is a synthetic five-amino-acid peptide that acts as a growth hormone secretagogue. Three of its residues are non-standard amino acids, and the chain ends in an amide rather than a free acid. The molecule is small enough that it can be characterised by routine peptide analytical techniques.
It has not received marketing approval as a medicine in the United States or the European Union. Supplied material is generally described and handled as a research chemical. Regulatory treatment varies by jurisdiction, and some countries restrict growth hormone secretagogues under sports or medicines legislation.
Earlier secretagogues were associated with broader hormonal responses, including measurable changes in cortisol and prolactin. Reports on this peptide describe a narrower profile in which growth hormone release is the most prominent effect. The observation is influential because it shapes how the compound is compared with other members of the same receptor family.
不是。它属于人工合成的五肽，设计上模拟胃饥饿素受体的部分作用，但不存在于人体天然激素谱中。