If you have been reading about secretagogue and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Updated 2026-08-01. Numbers and descriptions here follow the published literature rather than marketing material.
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。
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。
At the receptor level, ipamorelin binds GHS-R1a and triggers signaling through Gq-coupled pathways. Activation leads to calcium release and downstream effects in pituitary somatotroph cells. These events promote the release of growth hormone into circulation. The response depends on the presence of the receptor and on the physiological state of the animal or tissue studied. Because the receptor is also found in other tissues, effects beyond the pituitary have been examined in laboratory models, though the extent of those effects remains an area of ongoing study.
One distinguishing feature reported in animal studies is selectivity. Ipamorelin stimulated growth hormone release with limited elevation of adrenocorticotropic hormone or cortisol compared with earlier secretagogues such as GHRP-6. This pattern has been described as more selective for the growth hormone axis. The finding comes mainly from preclinical work, and the degree to which it holds across species and doses is not fully settled. Reports also describe effects on gastric motility in animal models, suggesting activity outside the pituitary, though the clinical relevance of this observation is uncertain.
Ipamorelin is a synthetic pentapeptide that acts on the growth hormone secretagogue receptor, also known as the ghrelin receptor. Its sequence contains five amino acid residues, including a non-natural residue that increases stability against enzymatic breakdown. The compound was developed in the 1990s as part of research into small peptides that stimulate pituitary hormone release. Unlike larger protein hormones, it can be produced by solid-phase peptide synthesis and characterized by standard analytical methods.
| Property | Value | Notes |
|---|---|---|
| 分子式 | C38H49N9O5 | 五肽，含非天然氨基酸残基 |
| 分子量 | 711.85 g/mol | 理论值，盐形式可能略有差异 |
| 外观 | 白色至类白色粉末 | 冻干粉常见 |
| 溶解性 | 易溶于水 | 也可溶于部分极性有机溶剂 |
| 储存条件 | -20°C，干燥避光 | 长期保存通常推荐 |
Ipamorelin is a synthetic pentapeptide that belongs to the growth hormone secretagogue family. Its sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2, incorporating two non-natural residues that resist enzymatic breakdown. Researchers at Novo Nordisk described the compound in the 1990s while searching for agents that release growth hormone with fewer side effects than earlier secretagogues. The molecule acts as an agonist at the ghrelin receptor, also called GHS-R1a, which is expressed in the pituitary and in several peripheral tissues.
Selectivity distinguishes ipamorelin from first-generation secretagogues such as GHRP-6. At doses that reliably raise growth hormone, it shows little stimulation of adrenocorticotropic hormone or cortisol release in animal models, and it does not markedly raise prolactin or appetite. Binding at GHS-R1a on pituitary somatotrophs triggers calcium influx and pulsatile growth hormone secretion. Because the compound mimics the natural ghrelin signal, the release pattern tends to follow the body's own rhythm rather than producing a sustained elevation.
At the cellular level, ipamorelin binds the growth hormone secretagogue receptor, also called the ghrelin receptor. Activation of this receptor on pituitary somatotroph cells triggers a signaling cascade that leads to release of growth hormone into circulation. Because release follows a pulsatile pattern, studies often report peak concentration and total area under the curve rather than a single time point. Selectivity for this receptor is the property most frequently discussed in comparative work.
Compared with older secretagogues such as hexarelin or GHRP-6, ipamorelin shows weaker stimulation of cortisol, prolactin, and appetite in the animal models used for early characterization. Whether that selectivity is preserved across longer human exposures remains an open question, because published clinical data are limited in size and duration. Reported effects on food intake are generally described as modest. The compound is therefore treated in the literature as a relatively selective research tool rather than a fully characterized therapeutic agent.
Ipamorelin is a synthetic pentapeptide that belongs to the growth hormone secretagogue class of compounds. Researchers at a pharmaceutical company first described it in the 1990s while screening small peptides for growth hormone releasing activity. Its chain contains five amino acid residues, two of which are non-natural building blocks, including 2-aminoisobutyric acid and a naphthylalanine derivative. The molecule was designed to act at the ghrelin receptor while avoiding several effects observed with earlier secretagogues.
In animal and early human studies, ipamorelin produces pulsatile growth hormone release and a secondary rise in insulin-like growth factor 1. The magnitude and duration of that rise depend on route, sampling schedule, and the baseline endocrine state of the subject. Whether repeated exposure alters the response over time is not firmly settled, since some reports describe stable pulsatility while others note attenuation. Most published data come from small samples, which limits the strength of any general claim about long-term behavior.
Ipamorelin is a synthetic pentapeptide that belongs to the growth hormone secretagogue class of compounds. Its sequence is Aib-His-D-2-Nal-D-Phe-Lys-NH2, a structure that differs from natural ghrelin in length and in the presence of non-natural amino acid residues. Early laboratory work described it as a comparatively selective agent that stimulates growth hormone release with limited effect on other pituitary hormones. The compound is supplied as a lyophilized solid for research use and has no identified natural source in the body.
Activity is mediated mainly through the growth hormone secretagogue receptor, now generally called the ghrelin receptor or GHS-R1a. Binding at this G-protein-coupled receptor triggers phospholipase C signaling, calcium mobilization, and release of growth hormone from pituitary somatotrophs. Reports describe less pronounced stimulation of adrenocorticotropic hormone and prolactin compared with earlier secretagogues such as hexarelin or GHRP-6. Selectivity figures vary between assay systems, so the degree of separation from other secretagogues is an area of ongoing comparison rather than a fixed constant.
Published discussion of this compound is uneven. Some references describe it as a tool for probing growth hormone regulation, while others focus on analytical characterization or on comparisons with related secretagogues. Statements about selectivity, half-life and potency often trace back to a small number of original reports that later authors cite secondhand. Readers evaluating a claim should therefore check whether a figure reflects a direct measurement or a repeated citation, and whether the underlying study was conducted in animals, in isolated cells or in human volunteers.
Identity and purity assessment for a research peptide of this kind typically combines reversed-phase high-performance liquid chromatography with mass spectrometry. The chromatographic run separates related impurities and yields a purity percentage, while electrospray ionization or matrix-assisted laser desorption mass spectrometry confirms the expected molecular mass. Amino acid analysis or tandem mass spectrometry sequencing can add confidence when material is intended for quantitative work. Laboratories differ in how they calculate and report purity, so figures from different sources are not always directly comparable.
Collins, who has suffered with urinary incontinence herself, said of the collaboration that she wanted to "help break down the stigma around the subject for women", describing it as "a taboo subject" and said that "it's really sad to know that women are stopping doing their activities because of leaks." Collins said she was "so surprised to find out how many women, just like [her], [were] also experiencing bladder leaks" adding that she had previously "held back on doing things [she enjoyed], like trampolining, riding a bike or working out, and dancing the night away with friends, because [she] was worried about bladder leaks" and that "since learning that pelvic floor exercises can help to manage them, and using pads for those moments when [she needed] more protection, [she] no longer [had] to hold back." Collins continued to collaborate with the brand over the following year to "get women talking and empower those experiencing bladder leaks to live life without compromise" and subsequently discussed her own experience on This Morning. In July 2023, she collaborated with the internet service provider Plusnet, for which she assumed the role of an agony aunt and answered queries from the public in an online video segment titled "Gemma's Dilemmas". Collins said of her role: "From technology mishaps to fashion disasters, I know what it's like to deal with daily frustrations and so this is why I am launching my new campaign, Gemma's Dilemmas, to give my advice to the nation and solve their problems – one step at a time.
Post-SSRI sexual dysfunction (PSSD) is an iatrogenic condition in which sexual side effects persist after discontinuation of serotonin reuptake inhibiting antidepressants, including escitalopram. Characteristic symptoms include genital numbness, pleasureless or weak orgasm, loss of libido, and erectile dysfunction; non-sexual symptoms such as emotional blunting and cognitive impairment may also occur. The condition can arise after even brief exposure to a serotonin reuptake inhibitor and may persist indefinitely; there is currently no established treatment. The DSM-5 noted in 2013 that serotonin reuptake inhibitor-induced sexual dysfunction may persist after the agent is discontinued. A 2023 retrospective cohort study of over 12,000 males estimated the risk of irreversible sexual dysfunction at approximately 0.46% of patients treated with serotonergic antidepressants, including SSRIs, though the actual prevalence remains uncertain and the condition is likely underreported. A 2023 systematic review found that escitalopram was the single most frequently reported SSRI in PSSD case reports, followed by citalopram, paroxetine, sertraline, and fluoxetine. In 2019, the European Medicines Agency's Pharmacovigilance Risk Assessment Committee (PRAC) recommended that product labels for all SSRIs and SNRIs, including escitalopram, be updated to state that sexual dysfunction may be long-lasting even after treatment is stopped. Health Canada followed with similar label updates in 2021.
== January 31, 1982 (Sunday) == The documentary Let Poland be Poland was televised around the world and reportedly watched by 185,000,000 in 50 nations. Hosted by Charlton Heston in the U.S., the show included appearances by Paul McCartney, Orson Welles, Henry Fonda, Kirk Douglas, Max von Sydow, James A. Michener, Glenda Jackson, Madeleine Albright and the song "Ever Homeward", sung by Frank Sinatra. The show also featured recorded segments from world leaders, including U.S. President Ronald Reagan, UK Prime Minister Margaret Thatcher, German Chancellor Helmut Schmidt, Japanese premier Zenkō Suzuki, French President François Mitterrand, and prime ministers Pierre Trudeau (Canada), Arnaldo Forlani (Italy), Adolfo Suárez (Spain), Kåre Willoch (Norway), Bülend Ulusu (Turkey), Francisco Pinto Balsemão (Portugal), Wilfried Martens (Belgium), Pierre Werner (Luxembourg) and Gunnar Thoroddsen (Iceland). The Statute of Autonomy of the Principality of Asturias went into effect, recognizing the right of self-government of the Spanish region of 78 municipalities in areas formerly occupied by the medieval Kingdom of Asturias, including the capital, Oviedo. Spain's province of Santander was renamed Cantabria
== Sources == Kahn, Charles H. (2001). Pythagoras and the Pythagoreans: A Brief History. Indianapolis, Indiana and Cambridge, England: Hackett Publishing Company. ISBN 978-0-87220-575-8. OCLC 46394974 – via Internet Archive. Varasdi, J. Allen (1996). Myth Information. New York: Ballantine Books. ISBN 0-345-41049-1.
Sources: en.wikipedia.org
These organostannanes are also stable to both air and moisture, and many of these reagents either are commercially available or can be synthesized from literature precedent. However, these tin reagents tend to be highly toxic. X is typically a halide, such as Cl, Br, or I, yet pseudohalides such as triflates and sulfonates and phosphates can also be used. Several reviews have been published.
The above descriptions ignore the effects of Gβγ–signalling, which can also be important, in particular in the case of activated Gαi/o-coupled GPCRs. The primary effectors of Gβγ are various ion channels, such as G-protein-regulated inwardly rectifying K+ channels (GIRKs), P/Q- and N-type voltage-gated Ca2+ channels, as well as some isoforms of AC and PLC, along with some phosphoinositide-3-kinase (PI3K) isoforms.
Tbr1 forms a complex with CASK and regulates gene expression in cortical development. Tbr1 binds to the guanylate kinase (GK) domain of CASK. It was determined that the C-terminal domain of Tbr1 in crucial and solely capable of this process. Through luciferase reporter assays of neurons in the hippocampus, it was found that increased Tbr1/CASK complex expression results in enhanced promoter activity in genes downstream of TBR1 such as NMDAR subunit 2b (NMDAR2b), glycine transporter, interleukin-7 receptor (IL-7R) and OX-2 genes. NMDAR2b experienced the greatest change in activity. Tbr1 and CASK also play an important role in activation of the RELN gene. One study suggests that CASK acts as a coactivator of TBR1, interacting with CINAP (CASK-interacting nucleosome assembly protein) to form a complex with Tbr1. The Tbr1/CASK/CINAP complex regulates expression of NMDAR2b and RELN, which both play important roles in long-term potentiation. Sox5 is another co-regulatory protein of Tbr1. Sox5 is a marker of layer VI neurons in the neocortex. It aids in the suppression of layer V neuron identity within layer VI cortical neurons through suppression of Fezf2. TBR1 is involved in the downstream regulation of Sox5. Sox5 expression was reduced in Tbr1 null mutants. It has been found that Sox5 interacts with Tbr1 to regulate Fezf2 transcription in layer VI cortical neurons.
Sources: en.wikipedia.org
== Further reading == Nuclides and Isotopes – 14th Edition, GE Nuclear Energy, 1989. Fioni, Gabriele; Cribier, Michel & Marie, Frédéric. "Can the minor actinide, americium-241, be transmuted by thermal neutrons?". Commissariat à l'énergie atomique. Archived from the original on 11 November 2007. Stwertka, Albert (1999). A Guide to the Elements. Oxford University Press, USA. ISBN 978-0-19-508083-4.
In September 2026, a UN-commissioned fact-finding mission panel found "reasonable grounds" to believe that the United States had committed war crimes during military strikes in Iran during the 2026 Iran war. The report highlighted two 28 February strikes that killed at least 178 civilians. U.S. president Donald Trump's threats to completely destroy Iranian power plants and other essential infrastructure during the 2026 Iran war have been widely condemned by human rights organizations, legal experts, and lawmakers as potential war crimes. The report published by the Independent International Fact-Finding Mission on Iran detailed two specific U.S. military operations on the first day of the 2026 Iran war that it determined constituted indiscriminate attacks on civilian infrastructure, the Minab School Bombing, where a U.S. Tomahawk missile strike targeted the Shajareh Tayyebeh Primary School in the southern city of Minab. The attack killed more than 150 people, including approximately 120 children. The UN mission concluded that the school was the intended point of impact rather than collateral damage, as well as the Lamerd Sports Complex Strike, where a separate U.S. airstrike utilized precision strike missiles to disperse tungsten pellets over a clearly identifiable sports complex and residential area in Lamerd. The attack resulted in the deaths of 22 civilian men and women. The Trump administration firmly rejected the allegations. White House spokeswoman Anna Kelly dismissed the findings as "unserious nonsense," stating that the U.S.
=== Tenerife === Upon landing on Tenerife, Humboldt and Bonpland were received by local officials and noted the distinctive flora of the island, including bananas, papaws, and ornamental plants. On June 20, before dawn,Bonpland an Humboldt departed with guides and mules for La Orotava, near the Teide volcano. They passed through San Cristébal, built on a basalt ridge around the Peak of Tenerife, and paused to inspect rocks, eventually arriving at La Laguna, the capital of Tenerife. After the climbing Humboldt and his party left La Laguna, traversing a landscape rich in plant diversity, including palms, orange trees, vines, and cacti. The region’s natural beauty was contrasted by socio-economic inequality, with land concentrated among a few wealthy planters and the indigenous population living in poverty. The group passed through Juan de la Rambla, Victoria, and Matanza, sites of both agricultural abundance and historical conflict with Spanish conquest in the fifteenth century. In La Orotava, they visited the botanical garden and met Monsieur LeGros, the French vice-consul, who had lived on Tenerife since being shipwrecked and agreed to guide their ascent of Pico del Teide. On 21 June 1799, the climbing party, which included LeGros, other local guides, and consular staff, departed for the volcano. The route passed solidly built but somber towns, lush gardens, and a renowned dragon tree, a species present in the Canaries but native to the West Indies, illustrating the complexities of plant distribution.
== Risk factors == Identified risk factors for plantar fasciitis include excessive running, prolonged standing on hard surfaces, high arches, leg length inequality, and flat feet. The tendency of flat feet to excessively roll inward, or supinate, during walking or running makes them more susceptible. Obesity is seen in 70% of individuals who present with plantar fasciitis and is an independent risk factor. Plantar fasciitis is commonly a result of some biomechanical imbalance that causes increased tension along the fascia. Achilles tendon tightness and inappropriate footwear are significant risk factors.
Sources: en.wikipedia.org
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。
生长激素释放激素通过其专用受体起作用，而 ipamorelin 主要作用于胃饥饿素受体。两者可影响生长激素释放，但信号通路和下游效应并不相同。
研究多集中在生长激素释放的急性调节、受体选择性以及不同给药方式下的药代动力学。临床终点研究数量有限，长期结局尚不明确。
It acts on the growth hormone secretagogue receptor, GHS-R1a, which is also the receptor for ghrelin. Binding triggers intracellular signaling that promotes growth hormone release from the pituitary. The interaction is the basis for its classification as a secretagogue.