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 2025-12-21. Anything still debated is marked as such rather than presented as settled.
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.
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.
Most published work on ipamorelin comes from rodent studies and small early-phase human trials. Subcutaneous and intravenous routes have been used, while oral delivery is limited by poor absorption and rapid breakdown in the gut. The reported plasma half-life is short, on the order of two hours, and varies with species and assay method. Whether chronic use produces meaningful clinical benefit remains unresolved, and long-term safety data in humans are sparse. No major regulatory agency has approved the compound as a therapeutic drug.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic pentapeptide | Growth hormone secretagogue family |
| Sequence | Aib-His-D-2-Nal-D-Phe-Lys-NH2 | Contains two non-natural residues |
| Molecular formula | C38H49N9O5 | Free base form |
| Molecular weight | 711.85 g/mol | Calculated from formula |
| Primary target | GHS-R1a ghrelin receptor | Agonist activity |
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.
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。
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.
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.
Material supplied for research use is normally a white to off-white lyophilized powder. The solid is hygroscopic and is handled in a low-humidity environment to limit water uptake. Bulk quantities are frequently shipped in sealed vials under inert gas. Once reconstituted in water or a neutral buffer, the solution is less stable than the dry powder and is usually divided into single-use aliquots.
Long-term storage of the dry powder is typically at minus twenty degrees Celsius or lower, protected from light and moisture. Solutions are commonly kept frozen and thawed only once, because repeated freeze-thaw cycles can promote aggregation and loss of measurable peptide content. Buffers near neutral pH are preferred over strongly acidic or strongly basic conditions. Shipping at ambient temperature is acceptable for short periods when the powder remains sealed and desiccated.
Only extensive modelling can enable the exploration of dynamic gene expression in a form suitable for research and design due to the numerous involved species and the intricacy of their relationships. Dynamic simulations of the entire biomolecular interconnection involved in regulation, transport, transcription, induction, and translation enable the molecular level detailing of designs. As opposed to modelling artificial networks a posteriori, this is contrasted.
=== Dietary supplements === In the US, multi-vitamin/mineral products typically contain 2 to 4 mg of vitamin B6 per daily serving as pyridoxine hydrochloride. However, many US dietary supplement companies also market a B6-only dietary supplement with 100 mg per daily serving. While the US National Academy of Medicine set an adult safety UL at 100 mg/day in 1998, in 2023 the European Food Safety Authority set its UL at 12 mg/day.
By September 1900, the British were nominally in control of both Republics, with the exception of north Transvaal. However, they discovered they only controlled the territory their columns physically occupied. Despite the loss of their capitals and half their army, the Boer commanders adopted guerrilla warfare, conducting raids against railways, resource and supply targets, aimed at disrupting the operational capacity of the British Army. They avoided pitched battles and casualties were light. Boer commando units were sent to the district from which its members were recruited, which meant they could rely on local support and knowledge of the terrain and towns, enabling them to live off the land. Their orders were simply to act against the British whenever possible. Their tactics were to strike fast causing as much damage as possible, then withdraw before enemy reinforcements could arrive. The vast distances of the republics allowed Boer commandos freedom to move about and made it nearly impossible for the 250,000 British troops to control the territory effectively using columns alone. As soon as a British column left a town or district, British control of that area faded away. Boer commandos were especially effective during the initial guerrilla phase because Roberts had assumed the war would end with the capture of the capitals and dispersal of the Boer armies. British troops were therefore redeployed out of the area, and had been replaced by lower-quality Imperial Yeomanry and locally-raised irregular corps.
=== Femarelle Rejuvenate === Femarelle Rejuvenate is intended for women in the perimenopausal stage and focuses on symptoms associated with hormonal fluctuations, including mood changes, tiredness, and changes affecting skin and hair. The formulation contains DT56a together with biotin and riboflavin (vitamin B2).
Sources: en.wikipedia.org
=== President of the Royal Society === One of the most prestigious institutions in the UK was the Royal Society. Mellanby put Florey's name forward for membership in 1937, but at that time it accepted only twenty new members each year. He was elected a fellow in 1941. The Royal Society was governed by a council of twenty-one fellows, and Florey served on the council from 1942 to 1943, and again from 1951 to 1953, when he was vice president. He received the Royal Society's Royal Medal in 1951 and its Copley Medal in 1957. By custom, the president of the Royal Society served for five years, and the position alternated between the mathematical and physical sciences, and the biological sciences, so Florey was eligible in 1960. Since the president was a public figure, his private life had to be beyond reproach, which was a sore point due to his relationship with Margaret Jennings.
ADAMTS7 was identified as a protease that binds and cleaves COMP in a yeast two-hybrid screen using the epidermal growth factor (EGF) domain of COMP as the bait. However, this initial finding has been contested; a 2025 study demonstrated that purified ADAMTS7 does not exhibit proteolytic cleavage activity toward purified COMP. Furthermore, three independent unbiased N-terminal amine isotopic labeling of substrates (N-TAILS) proteomic studies identified a number of candidate substrates for ADAMTS7 but did not identify COMP as a potential substrate. Consequently, there is as yet no scientific consensus on the physiological function of ADAMTS7. Tissue inhibitor of metalloproteinases 4 (TIMP-4) appears to be the physiological inhibitor of ADAMTS7.
238Pu also exists in sizable quantities in spent nuclear fuel but would have to be separated from other isotopes of plutonium. Irradiating neptunium-237 with electron beams, provoking bremsstrahlung, also produces quite pure samples of the isotope plutonium-236, useful as a tracer to determine plutonium concentration in the environment.
== Further reading == Manna, Utpal; Sritharan, S. S. (2007). "Lyapunov Functionals and Local Dissipativity for the Vorticity Equation in Lp and Besov spaces". Differential and Integral Equations. 20 (5): 581–598. arXiv:0802.2898. doi:10.57262/die/1356039440. S2CID 50701138. Barbu, V.; Sritharan, S. S. (2000). "M-Accretive Quantization of the Vorticity Equation" (PDF). In Balakrishnan, A. V. (ed.). Semi-Groups of Operators: Theory and Applications. Boston: Birkhauser. pp. 296–303. Krigel, A. M. (1983). "Vortex evolution". Geophysical & Astrophysical Fluid Dynamics. 24 (3): 213–223. Bibcode:1983GApFD..24..213K. doi:10.1080/03091928308209066.
No. 237 Squadron, based in Kenya since before the start of the war, had expanded to 28 officers and 209 other ranks by March 1940. By mid-1940, most of the officers and men Southern Rhodesia had sent overseas were in Kenya, attached to various East African formations, the King's African Rifles (KAR), the RWAFF, or to the colony's own Medical Corps or Survey Unit. The Southern Rhodesian surveyors charted the previously unmapped area bordering Abyssinia and Italian Somaliland between March and June 1940, and the Medical Corps operated No. 2 General Hospital in Nairobi from July. A company of coloured and Indian-Rhodesian transport drivers was also in the country, having arrived in January. The first Southern Rhodesian contingent despatched to North Africa and the Middle East was a draft of 700 from the Rhodesia Regiment who left in April 1940. No white Rhodesian force of this size had ever left the territory before. They were posted to a variety of British units across Egypt and Palestine. The largest concentration of Rhodesian soldiers in North Africa belonged to the King's Royal Rifle Corps (KRRC), whose connections with the colony dated back to World War I. Several Rhodesian platoons were formed in the KRRC's 1st Battalion in the Western Desert. A company of men from the Southern Rhodesian Signal Corps was also present, operating in tandem with the British Royal Corps of Signals.
Sources: en.wikipedia.org
In January 2024, the first 11 US spot bitcoin ETFs began trading, offering direct exposure to bitcoin for the first time on American stock exchanges. In December 2024, bitcoin price reached $100,000 for the first time, as US president-elect Donald Trump promised to make the US the "crypto capital of the planet" and to stockpile bitcoin. The same month, BlackRock, the world's largest asset manager, recommended investors to allocate up to 2% of their portfolio to bitcoin. As of 2025, the Salvadoran government continues to describe Bitcoin as legal tender under the 2021 Bitcoin Law; however, a January 2025 reform removed obligations for businesses and the government to accept it, so many analysts regard its legal-tender status as effectively ended in practice. In March 2025, President Trump signed an executive order to establish a strategic bitcoin reserve. Later that year, some U.S. states, such as Texas and New Hampshire also instituted strategic bitcoin reserves, and the Czech National Bank bought less than €1 million in a "test portfolio".
For services to Library and Information Services in Wales. George Norman Wilson, Vice-Chairman, Peak Park Joint Planning Board, Peak District National Park. For services to Local Government. Monica Wilson. For services to disabled people. Primrose Eileen Wilson. For services to Conservation. Anthony Webbe Winkle. For services to the Construction Industry in Scotland. Samuel Derek Woods. For public service. Diplomatic Service and Overseas List Norma Alice Cox Astwood, Vice-President, The Senate, Bermuda. David John Franklin Burton, Director, British Council, Jordan. The Honourable William McKeeva Bush, , Minister of Community Development, Sports, Women's and Youth Affairs and Culture, Cayman Islands. Alfred Chappory, . For services to sport in Gibraltar. Chen Din-hwa. For charitable and community services in Hong Kong. Joan Collins. For services to drama. Michael John Cooper, Principal, British School in the Netherlands. William Montgomerie Courtauld. For services to British commercial interests in Hong Kong. Thomas Eddie Cowin, lately Director, British Council, Ghana. Anthony Campbell Crombie, Deputy Head of Mission, Belgrade. Christopher Tom Franklin. For services to British musical interests in France. Robert John Gladwell. For services to British commercial and aerospace interests in the United States of America. Stuart Wreford Harbinson, , Permanent Hong Kong Representative to the World Trade Organization, Geneva. Peter Anthony Jenner, lately Editor, NATO Review. Sarah Caroline Rowland Jones, , lately First Secretary, HM Embassy, Budapest. Masood Husain Khan.
The Assam Legislative Assembly is the unicameral legislature of the Indian state of Assam. The Legislative Assembly comprises 126 Members of Legislative Assembly, directly elected from single-seat constituencies. Its term is five years, unless sooner dissolved. Members of the Assembly are directly elected by the people of Assam through elections held every five years, unless the Assembly is dissolved earlier. The current Assembly was elected in April–May 2026, and the next election is scheduled for 2031. The Assembly plays a key role in law-making for the state, handling crucial matters such as state budgets, development policies, and local governance. It has the authority to legislate on issues specified under the State and Concurrent Lists of the Constitution of India. The Assembly functions through various committees that handle specific issues, including the budget, public accounts, and legislative procedures. The Chief Minister, who is the leader of the majority party in the Assembly, holds executive powers and is the head of the state government.
== Early life == Princess Zita of Bourbon-Parma was born at the Villa Pianore in the Italian Province of Lucca, 9 May 1892. The unusual name Zita was given to her after Zita, a popular Italian saint who had lived in Tuscany in the 13th century. She was the third daughter and fifth child of the deposed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, a daughter of King Miguel of Portugal and his wife Adelaide of Löwenstein-Wertheim-Rosenberg. Zita's father had lost his throne as a result of the movement for Italian unification in 1859 when he was still a child. He fathered twelve children during his first marriage to Princess Maria Pia of the Two Sicilies (six of whom were mentally disabled, and three of whom died young). Duke Robert became a widower in 1882, and two years later he married Infanta Maria Antonia of Portugal. The second marriage produced a further twelve children. Zita was the 17th among Duke Robert's 24 children. Robert moved his large family between Villa Pianore (a large property located between Pietrasanta and Viareggio) and his Schwarzau Castle in Lower Austria. It was mainly in these two residences that Zita spent her formative years. The family spent most of the year in Austria, moving to Pianore in the winter and returning in the summer. To move between them, they took a special train with sixteen coaches to accommodate the family and their belongings.
Before entering metamorphosis, the larvae expel a transparent glue from their salivary gland through their mouth, which solidifies within a few seconds and fixes them into a substrate. Then the larvae encapsulate in the puparium and undergo a four-day-long metamorphosis (at 25 °C), after which the adults eclose (emerge).
Sources: en.wikipedia.org
It is a synthetic pentapeptide in the growth hormone secretagogue family. The chain contains five residues, two of which are non-natural amino acids.
It acts as an agonist at the growth hormone secretagogue receptor, also known as the ghrelin receptor. Binding at pituitary somatotroph cells promotes growth hormone release.
Early studies report weaker effects on cortisol, prolactin, and appetite than compounds such as GHRP-6. The size of that difference in humans is not firmly established.
The peptide is Aib-His-D-2-Nal-D-Phe-Lys-NH2. Two of its residues are non-natural, which slows enzymatic degradation. The C-terminal amide is common among bioactive peptides.