The short version of GHSR-1a fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2026-02-10. Anything still debated is marked as such rather than presented as settled.
Ipamorelin is a synthetic pentapeptide classified as a growth hormone secretagogue. Its sequence, Aib-His-D-2-Nal-D-Phe-Lys-NH2, combines three non-proteinogenic residues with a C-terminal amide. The N-terminal aminoisobutyric acid unit and the two aromatic D-amino acids distinguish it from peptides assembled only from standard L-amino acids. Its formula is C38H49N9O5, corresponding to an average mass near 711.9 Da. At neutral pH the molecule carries a net positive charge, a property that shapes its behaviour in chromatographic and electrophoretic systems.
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.
Ipamorelin 是一种合成五肽，序列为 Aib-His-D-2-Nal-D-Phe-Lys-NH2，分子式 C38H49N9O5，游离碱分子量约 711.85 g/mol。它属于生长激素促分泌素（GHS）家族，作用靶点是胃饥饿素受体 GHS-R1a。该化合物由诺和诺德的研究团队在二十世纪九十年代末报道，设计目标是提高对生长激素释放的选择性。C 端酰胺化与 N 端 Aib 残基是两个用于抵抗肽酶降解的结构特征。
在 GHS 家族中，早期肽类如 GHRP-6 与 GHRP-2 会同时促进生长激素、皮质醇与催乳素的释放，并明显增加食欲。Ipamorelin 在动物与早期人体研究中表现出对生长激素释放的相对选择性，对上述其他激素的影响较小。这种差异通常归因于受体结合模式与下游信号偏向的不同，而完整的分子解释仍有待补充。需要区分的是，选择性是研究观察中的相对程度，并非绝对界限。
| 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 |
The molecule contains five residues, including alpha-aminoisobutyric acid, D-2-naphthylalanine, and D-phenylalanine, and it ends in a lysine amide. Non-natural and D-configured residues make the chain less susceptible to common peptidases, which helps explain its resistance to rapid breakdown. Its molecular formula is C38H49N9O5, corresponding to a free-base mass near 711.9 daltons. The C-terminal amide removes a negative charge and is a recurring feature in receptor-active peptides of this family. These structural choices are usually discussed as the basis for its selectivity profile.
Published animal and early human work describes growth hormone release that is separated from comparable rises in adrenocorticotropic hormone and cortisol. Prolactin changes are reported as small in the same studies. Selectivity is attributed to binding at the ghrelin receptor and to the downstream signaling that follows, rather than to differences in how quickly the peptide is cleared. Authors commonly label the compound selective rather than potent, because the same mass produces a smaller growth hormone response than some older secretagogues tested in parallel. Whether that profile holds across species and routes of administration remains an open question.
Ipamorelin is a synthetic pentapeptide first described in the 1990s by researchers at Novo Nordisk during a program to develop selective growth hormone secretagogues. Its sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2, incorporating two non-natural residues, alpha-aminoisobutyric acid and D-2-naphthylalanine. The C-terminus is amidated, and the material is supplied as a white lyophilized powder. The molecular formula is C38H49N9O5 and the monoisotopic mass is approximately 711.85 daltons. The short chain and modified residues give it greater resistance to enzymatic degradation than many larger peptide hormones.
At the molecular level, ipamorelin acts as an agonist at the growth hormone secretagogue receptor type 1a, the same G protein-coupled receptor that binds ghrelin. Receptor activation couples to Gq/11 signaling, raising intracellular calcium through inositol trisphosphate and diacylglycerol, which in turn promotes exocytosis of growth hormone from pituitary somatotroph cells. Ipamorelin binds this receptor with high affinity and shows weak activity at other secretagogue-related targets in vitro. Its action requires the intact receptor and is not reversed by growth hormone-releasing hormone antagonists.
Compared with earlier growth hormone secretagogues such as GHRP-6 and hexarelin, ipamorelin has been reported to produce less stimulation of adrenocorticotropic hormone, cortisol, and prolactin in animal and early human studies. This selectivity is usually attributed to differences in receptor subtype interactions and to the tissue distribution of the receptor. Effects on appetite appear weaker than those of ghrelin itself, although the supporting evidence base is small. Whether these differences produce a distinct clinical profile remains an open question, since controlled human trials are limited.
=== Anxiety disorders === KOR antagonists have demonstrated anxiolytic efficacy in preclinical stress models and early clinical evaluation. Early generation antagonists such as JDTic and nor-BNI produced anxiolytic-like effects in GAD, PTSD, and panic disorder models. However their long duration of action and off-target toxicities limited clinical development. Contemporary short-acting antagonists such as aticaprant are being evaluated for anxiety indications given their improved pharmacokinetic profiles and reduced toxicity burden.
However, Fewster, who had a flourishing variolation practice, may have considered this option but used smallpox instead. He thought vaccination offered no advantage over variolation, but maintained friendly contact with Jenner and certainly made no claim of priority for vaccination when critics attacked Jenner's reputation. It seems clear that the idea of using cowpox instead of smallpox for inoculation was considered, and actually tried in the late 18th century, and not just by the medical profession. Therefore, Jenner was not the first to try cowpox inoculation. However, he was the first to publish his evidence and distribute vaccine freely, provide information on selection of suitable material, and maintain it by arm-to-arm transfer. The authors of the official World Health Organization (WHO) account Smallpox and its Eradication assessing Jenner's role wrote:
Regarding artistic influences, Levine cited the books Nineteen Eighty-Four and Logan's Run, representing societies that have "really interesting ideas screwed up by the fact that we're people". The idea of the mind control used on Jack was offered by LeBreton, inspired by films like The Manchurian Candidate, as a means to provide a better reason to limit the player's actions as opposed to the traditional use of locked doors to prevent them exploring areas they should not. The team had agreed that Jack's actions would be controlled by a key phrase but struggled with coming up with one that would not reveal Atlas' true nature. Levine happened upon "Would you kindly" after working on marketing materials for the game that asked the reader hypothetical questions such as "Would you kill people, even innocent people, to survive?", later working that phrase into the first script for the game. Levine's cultural background unintentionally influenced the game's themes, with the game's characters reflecting his culturally, but not religious, Jewish background. In the 2018 interview, Levine recognized several of the characters, including Andrew Ryan (who was inspired by Ayn Rand who was also Jewish), Sander Cohen, and Brigid Tenenbaum, were written all as Jewish, and all seeking to escape a world they felt they did not fit into by going to Rapture; Levine said: "'There's literal displacement and then there's a feeling of not fitting in, of 'I don't really belong here'. I think Jews are always going to feel a little bit like they don't belong wherever they are.
Sources: en.wikipedia.org
The same month, Lineage entered the Spanish marketplace, acquiring cold storage firm Frigorificos de Navarra of Gijón, Spain from Frioastur and, in June 2021, entered the European freight industry with its acquisition of Rotterdam-based UTI Forwarding, and also acquired Kloosterboer Group in Europe, and the cold storage division of Claus Sorensen Group in Denmark. In November 2021, Lineage expanded into the Italian cold storage market with the acquisition of Kantaro SRL. In January 2022, Lineage continued its expansion by acquiring Auscold Logistics in South Australia. In the same month, Lineage also acquired Van Tuyl Logistics, as well as individual locations from H&S Coldstores in Beneden-Leeuwen and Frigocare Rotterdam BV in Rotterdam. In March, Lineage further expanded its network by acquiring MTC Logistics, adding nearly 38 million cubic feet of capacity and more than 113,000 pallet positions in the United States and its presence at key ports along the U.S. East and Gulf Coasts. In April, Lineage acquired VersaCold Logistics to expand its presence in Canada. Later in May, the company acquired Mandai Link Logistics to expand into Singapore. In August, Lineage acquired Cold Storage Nelson in New Zealand. This increased its presence in the Asia-Pacific area. In August 2023, Lineage expanded its European network by acquiring Grupo Fuentes, a Spanish transport and cold store operator. In addition, Lineage strengthened its presence in northern Vietnam through a joint venture with SK Logistics.
Crucially, investigations confirmed that Kambolina had absolutely no involvement with the "Blue Whale Challenge" or online "death groups", as they did not exist at the time of her passing. Instead, her story and imagery were retroactively co-opted and weaponised by predatory online administrators to orchestrate a widespread moral panic, fabricate the mythos of a centralized "suicide game", and draw susceptible teenagers into harmful online communities.
It is not always distinguished from hematoidin, which one modern dictionary defines as synonymous with it but another defines as "apparently chemically identical with bilirubin but with a different site of origin, formed locally in the tissues from hemoglobin, particularly under conditions of reduced oxygen tension." The synonymous identity of bilirubin and hematoidin was confirmed in 1923 by Fischer and Steinmetz using analytical crystallography. In the 1930s, significant advances in bilirubin isolation and synthesis were described by Hans Fischer, Plieninger, and others, and pioneering work pertaining to endogenous formation of bilirubin from heme was likewise conducted in the same decade. The suffix IXα is partially based on a system developed Fischer, which means the bilin's parent compound was protoporphyrin IX cleaved at the alpha-methine bridge (see protoporphyrin IX nomenclature). Origins pertaining to the physiological activity of bilirubin were described by Ernst Stadelmann in 1891, who may have observed the biotransformation of infused hemoglobin into bilirubin possibly inspired by Ivan Tarkhanov's 1874 works. Georg Barkan suggested the source of endogenous bilirubin to be from hemoglobin in 1932. Plieninger and Fischer demonstrated an enzymatic oxidative loss of the alpha-methine bridge of heme resulting in a bis-lactam structure in 1942. It is widely accepted that Irving London was the first to demonstrate endogenous formation of bilirubin from hemoglobin in 1950, and Sjostrand demonstrated hemoglobin catabolism produces carbon monoxide between 1949 and 1952.
The relative molecular mass (denoted Mr) of a substance, formerly also called molecular weight and abbreviated as MW, is the mass of one molecule of that substance, relative to the dalton (Da), which is equal to 1/12 the mass of one atom of 12C. Due to this relativity, the molecular mass of a substance is commonly referred to as the relative molecular mass, and denoted to Mr.
Sources: en.wikipedia.org
===== Medicines for curative treatment ===== Artemether Artemether/lumefantrine (artemether + lumefantrine) Artesunate Artesunate/amodiaquine (artesunate + amodiaquine) Artesunate/mefloquine (artesunate + mefloquine) Artesunate/pyronaridine tetraphosphate (artesunate + pyronaridine tetraphosphate) Artesunate + sulfadoxine/pyrimethamine (Co-packaged) Chloroquine Dihydroartemisinin/piperaquine phosphate (dihydroartemisinin + piperaquine phosphate) Primaquine Quinine
Ag+ + BH4− + 3 H2O → Ag0 +B(OH)3 +3.5 H2 The reduced metal atoms will form nanoparticle nuclei. Overall, this process is similar to the above reduction method using citrate. The benefit of using sodium borohydride is increased monodispersity of the final particle population. The reason for the increased monodispersity when using NaBH4 is that it is a stronger reducing agent than citrate. The impact of reducing agent strength can be seen by inspecting a LaMer diagram which describes the nucleation and growth of nanoparticles. When silver nitrate (AgNO3) is reduced by a weak reducing agent like citrate, the reduction rate is lower which means that new nuclei are forming and old nuclei are growing concurrently. This is the reason that the citrate reaction has low monodispersity. Because NaBH4 is a much stronger reducing agent, the concentration of silver nitrate is reduced rapidly which shortens the time during which new nuclei form and grow concurrently yielding a monodispersed population of silver nanoparticles. Particles formed by reduction must have their surfaces stabilized to prevent undesirable particle agglomeration (when multiple particles bond together), growth, or coarsening. The driving force for these phenomena is the minimization of surface energy (nanoparticles have a large surface to volume ratio).
The latest ONS data shows that inflation was 2.2% in August, unchanged from the previous month. The UK operator of TGI Fridays goes into administration, putting 4,500 jobs at risk. 19 September A BBC investigation, which includes testimony from over 20 female ex-employees, reveals serious sexual abuse allegations by the late former Harrods owner Mohamed Al-Fayed. The Bank of England holds interest rates at 5%. BBC News reports that a number of offenders released early from prison to ease overcrowding have yet to be fitted with electronic tags, despite this being a condition of their release. The Met Office issues a yellow warning for thunderstorms for 20 and 21 September following a period of unseasonably warm weather. The final edition of the London Evening Standard is published, before it switches to a weekly format titled The London Standard, published each Thursday from 26 September. 20 September The UK's debt-to-GDP reaches 100%, its highest level since 1961. A tornado strikes the Hampshire town of Aldershot, causing damage to properties and trees. The UK operation of the international construction company ISG collapses, with the loss of 2,200 jobs. Steven Wilson, who suffered life-changing injuries after being stabbed as he worked in a prison kitchen while serving a sentence for burglary, is awarded more than £5m in damages by the High Court. The UK government confirms that domestic abuse specialists will be "embedded" in emergency 999 call centres in England and Wales as part of plans to halve the number of incidents of violence against women and girls in ten years.
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.
两者都是 GHS-R1a 激动剂，但 ipamorelin 在研究中显示出更高的生长激素释放选择性。早期资料显示它对皮质醇、催乳素与食欲的刺激弱于 GHRP-6。这些差异是相对程度，而非绝对区分。