This is a working overview of 生长激素促分泌剂, written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2026-08-01. Anything still debated is marked as such rather than presented as settled.
从用途定位看，ipamorelin 目前主要以研究用肽的身份被讨论，未见主要药品监管机构将其批准为治疗药物。市售材料通常标注仅供研究使用，不得用于人体或诊断程序。文献中它常与生长激素促分泌素、GHS-R1a 激动剂、胃饥饿素拟似物等表述并列出现。既有研究的样本量普遍偏小，因此对其效应强度与一致性的描述应保持谨慎。
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。
Lyophilized ipamorelin is generally held at minus twenty degrees Celsius or colder, protected from light and moisture. In solution the peptide is less stable, and degradation proceeds through hydrolysis of the amide backbone, oxidation of the histidine residue, and aggregation. Repeated freeze-thaw cycles accelerate these processes, so dividing material into single-use aliquots before freezing is common practice in research settings. Buffered formulations near neutral pH tend to show the slowest degradation, while strongly acidic or basic conditions raise hydrolysis rates. Stability data specific to ipamorelin are sparse, and much guidance is extrapolated from other short peptides.
Quality control for research-grade ipamorelin is not governed by a single harmonized pharmacopeial monograph, so certificates of analysis vary between suppliers. Common tests include appearance, solubility, water content, peptide content by quantitative amino acid analysis, and residual counterion measurement. Independent verification by an outside laboratory is often used to confirm identity and purity claims. Salt form, counterion content, and residual solvent levels are frequently unspecified, which complicates direct comparison between lots and leaves reproducibility partly unresolved.
Identity and purity assessment of ipamorelin relies mainly on reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometers, a wavelength where the peptide backbone absorbs. Mass confirmation is typically obtained by electrospray ionization mass spectrometry or by liquid chromatography coupled to mass spectrometry, comparing the observed mass with the calculated value. Amino acid analysis and peptide mapping after enzymatic digestion can confirm the sequence. Impurity profiles include deletion peptides, truncated fragments, and oxidation products, reported as relative area percentages.
| Property | Value | Notes |
|---|---|---|
| 分子式 | C38H49N9O5 | 五肽，C 端酰胺化 |
| 分子量 | 约 711.85 g/mol | 游离碱形式 |
| 外观 | 白色至类白色冻干粉 | 研究用材料的常见形态 |
| 溶解性 | 溶于水及 DMSO 等极性溶剂 | 建议现配现用 |
| 储存温度 | -20 °C 或更低 | 干燥、避光、限制冻融次数 |
The lyophilised solid is normally held at -20 °C or colder, shielded from light and moisture. Stability in that state is measured in years, although shelf life depends on residual water content and the container seal. Once dissolved, the peptide is more fragile: aqueous solutions are commonly kept at 2-8 °C and used within days to weeks, and repeated freeze-thaw cycling is avoided. Strongly acidic or basic conditions accelerate hydrolysis, and prolonged exposure to them can strip the terminal amide.
Purity assessment for this peptide relies mainly on reversed-phase high-performance liquid chromatography. A C18 column with a water-acetonitrile gradient containing trifluoroacetic acid separates the target from truncated sequences and oxidation products. Detection near 214 nm exploits the amide backbone, while the aromatic side chains allow additional monitoring close to 280 nm. Reported purity values depend on the method, so a certificate of analysis carries weight only when gradient, column and integration parameters are given.
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.
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。
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。
Lyophilized ipamorelin powder is the form usually supplied for laboratory work. Kept dry, protected from light, and held at minus 20 degrees Celsius or below, it remains stable for extended periods, often measured in years. Once dissolved, the peptide degrades faster through hydrolysis, oxidation, and deamidation, so solutions are typically refrigerated and used within weeks. Repeated freeze-thaw cycles and exposure to alkaline conditions accelerate loss of the parent compound.
Reversed-phase high-performance liquid chromatography is the standard tool for assessing purity. Detection near 214 nanometers captures the peptide backbone, and the resulting chromatogram shows the main peak alongside related impurities. Electrospray ionization mass spectrometry confirms molecular mass and supports sequence verification. Common degradation products include oxidized residues, deamidated forms, and truncated fragments, each appearing as a distinct peak or shoulder in the trace.
Cys arylation Free thiols has been considered unfavorable for Pd-mediated reactions due to Pd-catalyst decomposition. However, PdII oxidative addition complexes (OACs) supported by dialkylbiaryl phosphine ligands have shown to work efficiently towards cysteine S-arylation. The first example is the use of PdII OAC with RuPhos: The PdII complex resulting from the oxidative addition of aryl halides or trifluoromethanesulfonates and using RuPhos as the ligand could chemoselectively modify cysteines in various buffer with 5% organic co-solvent under neutral pH. This method has been shown to modify peptides and proteins, achieve peptide macrocyclization (by using bis-palladium reagent and peptides with two unprotected cysteines) and synthesizing antibody-drug conjugates (ADCs). Changing the ligand to sSPhos supports the PdII complex to be sufficiently water soluble to achieve cysteine S-arylation under cosolvent-free aqueous conditions.
Le Havre is located 50 kilometres (31 miles) west of Rouen on the shore of the English Channel and at the mouth of the Seine. Numerous roads link to Le Havre with the main access roads being the A29 autoroute from Amiens and the A13 autoroute from Paris linking to the A131 autoroute.
Isoliquiritigenin is a chalcone found in the roots of several Glycyrrhiza species, such as liquorice, studied for its activity as a tyrosinase inhibitor, NMDA receptor antagonist, GABA modulator, and its potential antineoplastic and geroprotective effects.
Trifluridine (also called trifluorothymidine; abbreviation TFT or FTD) is an anti-herpesvirus antiviral drug, used primarily as prescription eyedrops. It was sold under the trade name Viroptic by Glaxo Wellcome, now merged into GlaxoSmithKline. The brand is now wholly owned by King Pharmaceuticals. Trifluridine was approved for medical use in 1980. It is also a component of the anti-cancer drug trifluridine/tipiracil, which is taken by mouth.
Sources: en.wikipedia.org
== Recognition == In 2003, a GameSpy editorial cited Minh Le as the most important reason Half-Life was still popular five years after it was released. IGN ranked Jess Cliffe and Minh Le as number 14 in their "Top 100 Game Creators of All Time" list.
=== In diagnosis === Lactoferrin levels in tear fluid have been shown to decrease in dry eye diseases such as Sjögren's syndrome. A rapid, portable test utilizing microfluidic technology has been developed to enable measurement of lactoferrin levels in human tear fluid at the point-of-care with the aim of improving diagnosis of Sjögren's syndrome and other forms of dry eye disease.
=== Cardiovascular system === Nicotine exerts several significant effects on the cardiovascular system. Primarily, it stimulates the sympathetic nervous system, leading to the release of catecholamines. This activation results in an increase in heart rate and blood pressure, as well as enhanced myocardial contractility, which raises the workload on the heart. Additionally, nicotine causes systemic vasoconstriction, including constriction of coronary arteries, which can reduce blood flow to the heart. Long-term exposure to nicotine may impair endothelial function, potentially contributing to atherosclerosis. Furthermore, nicotine has been associated with the development of cardiac arrhythmias, particularly in individuals who already have underlying heart disease. The effects of nicotine can be differentiated between short-term and long-term use. Short-term nicotine use, such as that associated with nicotine replacement therapy (NRT) for smoking cessation, appears to pose little cardiovascular risk, even for patients with known cardiovascular conditions. In contrast, longer-term nicotine use may not accelerate atherosclerosis but could contribute to acute cardiovascular events in those with pre-existing cardiovascular disease. Many severe cardiovascular effects traditionally associated with smoking may not be solely attributable to nicotine itself. Cigarette smoke contains numerous other potentially cardiotoxic substances, including carbon monoxide and oxidant gases.
Ambulatory care pharmacy (BCACP) Critical care pharmacy (BCCCP) Nuclear pharmacy (BCNP) Nutrition support pharmacy (BCNSP) Oncology pharmacy (BCOP) Pediatric pharmacy (BCPPS) Geriatric pharmacy (BCGP) Pharmacotherapy (BCPS) Infectious disease pharmacy (BCIDP) Compounded sterile preparations pharmacy (BCSCP) Cardiology pharmacy (BCCP) Emergency medicine pharmacy (BCEMP) Transplant Pharmacist (BCTXP) Psychiatric pharmacy (BCPP) There are several types of clinical pharmacists in the United States. In California they are called advanced practice pharmacists (APh). In New Mexico, they are known as Pharmacist Clinicians (PhC) and lastly in Montana and North Carolina they are known as Clinical Pharmacist Practitioners (CPP). Clinical pharmacists in the Veteran Administration are known as Clinical Pharmacy Specialists (CPS). Role in the health care system Within the system of health care, clinical pharmacists are experts in the therapeutic use of medications. They routinely provide medication therapy evaluations and recommendations to patients and other health care professionals. Clinical pharmacists are a primary source of scientifically valid information and advice regarding the safe, appropriate, and cost-effective use of medications. Clinical pharmacists are also making themselves more readily available to the public. In the past, access to a clinical pharmacist was limited to hospitals, clinics, or educational institutions.
Homochirality is the uniformity of materials composed of chiral (non-mirror-symmetric) units. Living organisms use molecules with the same chirality: with almost no exceptions, amino acids are left-handed while nucleotides and sugars are right-handed. Chiral molecules can be synthesized, but in the absence of a chiral source or a chiral catalyst, they are formed in a 50/50 (racemic) mixture of both forms. Non-racemic mixtures can arise from racemic materials by asymmetric physical laws such as the electroweak interaction, or in asymmetric environments, such as those in which molecules are exposed to circularly polarized light of a given handedness. It has been hypothesized that the solar nebula was such an environment, exposed to circularly-polarized radiation from an external source before or during the epoch of planet formation. This proposal is consistent with the finding that some amino acids delivered to Earth in meteorites exhibit a chiral asymmetry of the same sign as terrestrial life. Once established, a chirality imbalance may influence subsequent chemical evolution. A small bias in the population can be amplified by asymmetric autocatalysis, as in the Soai reaction, where a chiral molecule catalyzes its own production.
Sources: en.wikipedia.org
=== 20th-century use === Opium production in China and the rest of East Asia was nearly wiped out after WWII; however, sustained covert support by the United States Central Intelligence Agency for the Thai Northern Army and the Chinese Nationalist Kuomintang army invading Burma facilitated production and trafficking of the drug from Southeast Asia for decades, with the region becoming a major source of world supplies. During the Communist era in Eastern Europe, poppy stalks sold in bundles by farmers were processed by users with household chemicals to make kompot ("Polish heroin"), and poppy seeds were used to produce koknar, an opiate.
=== Legal status === In March 2024, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Agilus, intended for the treatment of malignant hyperthermia in combination with adequate support measures. The applicant for this medicinal product is Norgine B.V. In the formulation of Agilus, the mannitol and sodium hydroxide have been replaced with hydroxypropyl-beta-cyclodextrin (HP-β-CD) and Macrogol 3350 to shorten the preparation time and improve the ease of use. It was designated an orphan drug. Dantrolene sodium, hemiheptahydrate (Agilus) was approved for medical use in the European Union in May 2024.
=== Treatment === A potential treatment for the high ammonia levels is to give sodium benzoate, which combines with glycine to produce hippurate, at the same time removing an ammonium group. Biotin (vitamin B7) also plays an important role in the functioning of the OTC enzyme and has been shown to reduce ammonia intoxication in animal experiments. Additionally, the use of whole-body therapeutic hypothermia (TH) has been proposed and studied as a treatment. TH is thought to increase the effectiveness of dialysis to extract ammonia from the body.
The dioxide is soluble in acidic solutions (the monoxide GeO, is even more so), and this is sometimes used to classify germanium as a metal. Up to the 1930s germanium was considered to be a poorly conducting metal; it has occasionally been classified as a metal by later writers. As with all the elements commonly recognised as metalloids, germanium has an established organometallic chemistry (see Organogermanium chemistry).
== 2016 suspension from coaching == On 12 January 2016, McVeigh was named as one of 34 past and present Essendon players found guilty over their use of illegal supplements during the 2012 AFL season. As a result, McVeigh was suspended from involvement in football for twenty-four months, which (due to back-dating and time served in provisional suspensions) saw him suspended until November 2016. The terms of the suspension meant that McVeigh was unable to continue his assistant coaching role at Greater Western Sydney during 2016.
Sources: en.wikipedia.org
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。
公开资料中它主要以研究用肽的形式出现，未获主要监管机构批准用于治疗。可得材料通常标注仅供研究使用。任何临床用途的宣称都缺少监管依据。
序列中的 Aib 与 D-2-Nal 等非天然残基可提高对肽酶的抵抗能力，并影响受体结合的构象。这类修饰在合成肽设计中较为常见。它们也使常规氨基酸分析需要额外步骤才能确认序列。
Aib 即 α-氨基异丁酸，是一种非蛋白质源氨基酸，其侧链为两个甲基。它在肽链中倾向于诱导螺旋构象并限制骨架的柔性。这种刚性被认为有助于抵抗蛋白酶切割。