growth hormone secretagogue comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-07-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
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.
| 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 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.
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 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。
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。
== Toxicity == α-Bungarotoxin belongs to a group of bungarotoxins, which are a type of poisonous proteins found in the venom of kraits - among the six most deadly snakes in Asia. Their bite can lead to respiratory paralysis and death. α-Bungarotoxin irreversibly and competitively binds to muscular and neuronal acetylcholine receptors. The paralysis happens due to the neuromuscular transmission at the postsynaptic site being blocked. LD50 values, representing lethal dose required to cause death in 50%, were studied in mice using different routes of administration. Subcutaneous administration showed that 0.108 mg/kg was needed to kill 50% of mice. Intravenous administration resulted in a slightly higher LD50 value of 0.113 mg/kg. However, when it was administered intraperitoneally, the LD50 value was 0.08 mg/kg. These values can aid in risk assessment of the toxin.
Clobazam is predominantly a positive allosteric modulator at the GABAA receptor to increase GABAergic transmission, particularly chloride conductance in neurons and with some speculated additional activity at sodium channels and voltage-sensitive calcium channels. Clobazam binds at a distinct binding site associated with a Cl− ionophore at the GABAA receptor, increasing the duration of time for which the Cl− ionophore is open. The post-synaptic inhibitory effect of GABA in the thalamus is prolonged as a result. The exact mechanism of action for clobazam, a 1,5-benzodiazepine, which has anxiolytic and anticonvulsant effects similar to those produced by other benzodiazepine derivatives. Clobazam is a potent benzodiazepine receptor partial agonist at the GABAA receptor and the effects are related to binding to one or more specific GABA receptor subunits, increasing GABA-mediated inhibition. Clobazam is thought to involve the potentiation of GABAergic neurotransmission resulting from binding at the benzodiazepine site of the GABAA receptor. Like other 1,5-benzodiazepines (for example, arfendazam, lofendazam, triflubazam, and CP-1414S), clobazam and the active metabolite N-desmethylclobazam have less affinity for the α1 subunit (sedative effects) of the GABAA receptor compared to the 1,4-benzodiazepines. They have a higher affinity for the α2 subunit (anxiolytic effects) and γ2 subunit of the GABAA receptor, which is essential for the anxiolytic and anticonvulsant effects of clobazam.
=== Derivatives === A number of derivatives of 18-MC have been developed, with several of them being superior to 18-MC itself, the methoxyethyl congener ME-18-MC being more potent than 18-MC with similar efficacy, and the methylamino analogue 18-MAC being more effective than 18-MC with around the same potency. These compounds were also found to act as selective α3β4 nicotinic acetylcholine antagonists, with little or no effect on NMDA receptors.
As chronic obstructive pulmonary disease (COPD) advances, about 35% of patients experience severe weight loss called pulmonary cachexia, including diminished muscle mass. Around 25% experience moderate to severe weight loss, and most others have some weight loss. Greater weight loss is associated with poorer prognosis. Theories about contributing factors include appetite loss related to reduced activity, additional energy required for breathing, and the difficulty of eating with dyspnea (labored breathing). Cancer, a very common and sometimes fatal cause of unexplained (idiopathic) weight loss. About one-third of unintentional weight loss cases are secondary to malignancy. Cancers to suspect in patients with unexplained weight loss include gastrointestinal, prostate, hepatobiliary (hepatocellular carcinoma, pancreatic cancer), ovarian, hematologic or lung malignancies. People with HIV often experience weight loss, and it is associated with poorer outcomes. Wasting syndrome is an AIDS-defining condition. Gastrointestinal disorders are another common cause of unexplained weight loss – in fact they are the most common non-cancerous cause of idiopathic weight loss. Possible gastrointestinal etiologies of unexplained weight loss include: celiac disease, peptic ulcer disease, inflammatory bowel disease (crohn's disease and ulcerative colitis), pancreatitis, gastritis, diarrhea, chronic mesenteric ischemia and many other GI conditions. Infection. Some infectious diseases can cause weight loss.
Sources: en.wikipedia.org
Although American rocket pioneer Robert H. Goddard developed, patented, and flew small liquid-propellant rockets as early as 1914, the United States was the only one of the three major allied World War II powers to not have its own rocket program, until Von Braun and his engineers were expatriated from Nazi Germany in 1945. The US acquired a large number of V-2 rockets and recruited von Braun and most of his engineering team in Operation Paperclip. The team was sent to the Army's White Sands Proving Ground in New Mexico, in 1945. They set about assembling the captured V-2s and began a program of launching them and instructing American engineers in their operation. These tests led to the first photos of Earth from space, and the first two-stage rocket, the WAC Corporal-V-2 combination, in 1949. The German rocket team was moved from Fort Bliss to the Army's new Redstone Arsenal, located in Huntsville, Alabama, in 1950. From here, von Braun and his team developed the Army's first operational medium-range ballistic missile, the Redstone rocket, derivatives of which launched both America's first satellite, and the first piloted Mercury space missions. It became the basis for both the Jupiter and Saturn family of rockets.
Military tension between the two countries in the Kargil district led to the Kargil War of 1999, and turmoil in civil-military relations allowed General Pervez Musharraf to take over through a bloodless coup d'état. Musharraf governed Pakistan as chief executive from 1999 to 2002 and as president from 2001 to 2008—a period of enlightenment, social liberalism, extensive economic reforms, and direct involvement in the US-led war on terrorism. By its own financial calculations, Pakistan's involvement in the war on terrorism has cost up to $118 billion, over eighty one thousand casualties, and more than 1.8 million displaced civilians. The National Assembly historically completed its first full five-year term on 15 November 2007. After the assassination of Benazir Bhutto in 2007, the PPP secured the most votes in the elections of 2008, appointing party member Yusuf Raza Gilani as Prime Minister. Threatened with impeachment, President Musharraf resigned on 18 August 2008, and was succeeded by Asif Ali Zardari. Clashes with the judicature prompted Gilani's disqualification from the Parliament and as the prime minister in June 2012. The general election held in 2013 saw the PML (N) achieve victory, following which Nawaz Sharif was elected as Prime Minister for the third time. In 2018, PTI won the general election and Imran Khan became the 22nd Prime Minister. In April 2022, Shehbaz Sharif was elected as prime minister, after Imran Khan lost a no-confidence vote.
Serine proteases - using a serine alcohol Cysteine proteases - using a cysteine thiol Threonine proteases - using a threonine secondary alcohol Aspartic proteases - using an aspartate carboxylic acid Glutamic proteases - using a glutamate carboxylic acid Metalloproteases - using a metal, usually zinc Asparagine peptide lyases - using an asparagine to perform an elimination reaction (not requiring water) Proteases were first grouped into 84 families according to their evolutionary relationship in 1993, and classified under four catalytic types: serine, cysteine, aspartic, and metallo proteases. The threonine and glutamic proteases were not described until 1995 and 2004 respectively. The mechanism used to cleave a peptide bond involves making an amino acid residue that has the cysteine and threonine (proteases) or a water molecule (aspartic, glutamic and metalloproteases) nucleophilic so that it can attack the peptide carbonyl group. One way to make a nucleophile is by a catalytic triad, where a histidine residue is used to activate serine, cysteine, or threonine as a nucleophile. This is not an evolutionary grouping, however, as the nucleophile types have evolved convergently in different superfamilies, and some superfamilies show divergent evolution to multiple different nucleophiles. Metalloproteases, aspartic, and glutamic proteases utilize their active site residues to activate a water molecule, which then attacks the scissile bond.
Sources: en.wikipedia.org
German cider, usually called Apfelwein (apple wine), and regionally known as Ebbelwoi, Apfelmost (apple must), Viez (from Latin vice, the second or substitute wine), or Saurer Most (sour must), has an alcohol content of 5.5–7% and a tart, sour taste. German cider is mainly produced and consumed in Hessen, particularly in the Frankfurt, Wetterau, and Odenwald areas, in Moselfranken, Merzig (Saarland) and the Trier area, as well as the lower Saar area and the region bordering on Luxembourg and in the area along the Neckar River in Swabia. In these regions, several large producers, as well as numerous small, private producers, often use traditional recipes. An official Viez route or cider route connects Saarburg with the border to Luxembourg.
However, the military provided him with no records of any medical discrepancies caused by actions during war. If Willie was to be diagnosed with Gulf War Illness, he would not have a course of treatment. He would have to learn to cope with the disease until a treatment becomes available in the future. Willie and his wife go to visit a Marine Veteran who was diagnosed with Gulf War Illness to be able to relate any similarities and narrow down the possibilities.
General standards for broadcasting are found in the Audiovisual Media Services Directive 2010. It defines an audiovisual media services to mean those 'devoted to providing programmes, under the editorial responsibility of a media service provider, to the general public, in order to inform, entertain or educate, to the general public by electronic communications networks', either on TV or an 'on-demand' service. An 'on-demand' service involves 'viewing of programmes at the moment chosen by the user and at his individual request on the basis of a catalogue of programmes selected by the media service provider'. Member states must ensure audiovisual services 'do not contain any incitement to hatred' based on race, sex, religion, nationality or other protected characteristics. Article 9 prohibits media with 'surreptitious' communication or 'subliminal' techniques, to 'prejudice respect for human dignity', that would 'promote any discrimination', prejudice health and safety or 'encourage behaviour grossly prejudicial to the protection of the environment'. Social media on Facebook, YouTube or Twitter may be thought to be exempt as they lack 'editorial responsibility', however each use algorithms to exert 'effective control' and profit from arrangement of media.
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 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.