This is a working overview of secretagogue, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2025-09-05 and is reviewed periodically as new material appears.
At the molecular level, ipamorelin acts as an agonist at the growth hormone secretagogue receptor, also called the ghrelin receptor or GHS-R1a. Binding to this receptor on pituitary somatotroph cells triggers a signaling cascade that leads to growth hormone release. The effect is mediated through phospholipase C and calcium mobilization rather than through the cyclic AMP pathway used by growth hormone releasing hormone. The two pathways are complementary, and combined stimulation produces a larger response than either alone.
Compared with other secretagogues such as GHRP-2, GHRP-6, and hexarelin, ipamorelin is described as more selective. Published animal work reports little or no increase in adrenocorticotropic hormone, cortisol, or prolactin at doses that release growth hormone. This selectivity is the property most often cited in the research literature. Whether the same profile holds across species and dosing schedules remains an open question, since human data are limited and come largely from small studies.
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。
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic pentapeptide | Growth hormone secretagogue family |
| Molecular mass | Approximately 711.9 Da | Free base, calculated value |
| Receptor target | GHS-R1a, the ghrelin receptor | Agonist activity reported |
| Sequence | Aib-His-D-2-Nal-D-Phe-Lys-NH2 | C-terminal amide |
| Reported selectivity | Little change in ACTH, cortisol, prolactin | Based mainly on animal data |
Lyophilized material is generally stored cold and dry, with desiccant, and protected from light. In solution the peptide is more vulnerable: the histidine side chain can oxidize, and repeated freeze-thaw cycles promote aggregation and loss of material to container surfaces. A mildly acidic aqueous buffer is often used for short-term handling because it limits several degradation routes. Accurate prediction of long-term stability under a given set of conditions is difficult, and published stability data remain sparse.
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.
Structural features distinguish the molecule from earlier secretagogues. An alpha-aminoisobutyric acid residue near the N-terminus and a D-naphthylalanine substitution increase receptor affinity, while C-terminal amidation improves resistance to exopeptidases. These modifications are associated with reduced stimulation of appetite and of the hypothalamic-pituitary-adrenal axis compared with hexarelin or growth hormone releasing peptide-6. Whether the same profile applies at every dose level studied is a matter of ongoing investigation rather than settled consensus.
Ipamorelin is a synthetic pentapeptide that acts as an agonist at the ghrelin receptor, also called the growth hormone secretagogue receptor type 1a. Its sequence incorporates non-natural residues, which slows enzymatic breakdown relative to short native peptides. In laboratory and early clinical work the compound is described as a selective growth hormone secretagogue because it raises growth hormone with comparatively little effect on other pituitary outputs. The degree to which that selectivity holds across species and dosing regimens remains an open question in the published literature.
In the scientific literature, ipamorelin appears mainly in preclinical studies, receptor binding assays, and reviews of growth hormone secretagogues. Authors often discuss its selectivity profile alongside limitations such as small sample sizes, short study durations, and differences between species. Some papers examine pharmacokinetics and clearance, but human data are limited and not sufficient to define general clinical effects. Regulatory discussion treats the compound as an investigational or research substance rather than an approved therapy in most jurisdictions. Open questions include oral bioavailability, long-term endocrine effects, and whether selectivity observed in animals persists in humans.
Research peptides such as ipamorelin are commonly supplied as lyophilized powder and characterized by analytical certificates. Reversed-phase high-performance liquid chromatography is used to estimate purity by ultraviolet absorbance, while mass spectrometry confirms molecular identity and detects sequence-related impurities. Counterion content, water content, and residual synthesis reagents can affect the reported mass balance. A certificate of analysis may list a purity percentage, but that number depends on the analytical method and the definition of impurity peaks. Independent verification is often recommended because research supply chains vary in quality control practices.
Hans Studener (1966–1969) Kurt Holke (1969–1971) Horst Scherbaum (1971–1976) Manfred Pfeifer (1976–1978) Heinz Joerk (1978–1979) Harro Miller (1979–1985) Hans-Ulrich "Uli" Thomale (1985 – February 1990) Gunter Böhme (February 1990 – 27 May 1991) VfB Leipzig
Friedrich Sertürner (1783–1841) first isolated morphine from opium in 1804; he named it morphine after Morpheus, the Greek god of dreams. Henry Hill Hickman (1800–1830) experimented with the use of carbon dioxide as an anesthetic in the 1820s. He would make the animal insensible, effectively via almost suffocating it with carbon dioxide, then determine the effects of the gas by amputating one of its limbs. In 1824, Hickman submitted the results of his research to the Royal Society in a short treatise titled Letter on suspended animation: with the view of ascertaining its probable utility in surgical operations on human subjects. The response was an 1826 article in The Lancet titled "Surgical Humbug" that ruthlessly criticised his work. Hickman died four years later at age 30. Though he was unappreciated at the time of his death, his work has since been positively reappraised and he is now recognised as one of the fathers of anesthesia. By the late 1830s, Humphry Davy's experiments had become widely publicized within academic circles in the northeastern United States. Wandering lecturers would hold public gatherings, referred to as "ether frolics", where members of the audience were encouraged to inhale diethyl ether or nitrous oxide to demonstrate the mind-altering properties of these agents while providing much entertainment to onlookers. Four notable men participated in these events and witnessed the use of ether in this manner. They were William Edward Clarke (1819–1898), Crawford W. Long (1815–1878), Horace Wells (1815–1848), and William T. G. Morton (1819–1868).
In addition to publishing numerous reviews of opera performances and concerts, Adorno's Four Songs for medium voice and piano, Op. 3, was performed in Berlin in January 1929. Between 1928 and 1930, Adorno took on a greater role within the editorial committee of the Musikblätter des Anbruchs. In a proposal for transforming the journal, he sought to use Anbruch to champion radical modern music against what he called the "stabilized music" of Pfitzner, the later Richard Strauss, as well as the neoclassicism of Stravinsky and Hindemith. During this period he published the essays "Night Music," "On Twelve-Tone Technique," and "Reaction and Progress." Yet his reservations about twelve-tone orthodoxy became steadily more pronounced. According to Adorno, twelve-tone technique's use of atonality can no more be regarded as an authoritative canon than can tonality be relied on to provide instructions for the composer. At this time Adorno struck up a correspondence with the composer Ernst Krenek, discussing problems of atonality and the twelve-tone technique. In a 1934 letter, he sounded a related criticism of Schoenberg:
==== Release of endorphins or adenosine ==== Some modern practitioners support the use of acupuncture to treat pain, but have abandoned the use of qi, meridians, yin, yang and other mystical energies as an explanatory frameworks. The use of qi as an explanatory framework has been decreasing in China, even as it becomes more prominent during discussions of acupuncture in the US. Many acupuncturists attribute pain relief to the release of endorphins when needles penetrate, but no longer support the idea that acupuncture can affect a disease. Some studies suggest acupuncture causes a series of events within the central nervous system, and that it is possible to inhibit acupuncture's analgesic effects with the opioid antagonist compound naloxone, suggesting that the use of acupuncture may trigger the release of endogenous opioids. Mechanical deformation of the skin by acupuncture needles appears to result in the release of adenosine. The anti-nociceptive effect of acupuncture may be mediated by the adenosine A1 receptor. A 2014 review in Nature Reviews Cancer analyzed mouse studies that suggested acupuncture relieves pain via the local release of adenosine, which then triggered nearby A1 receptors. The review found that in those studies, because acupuncture "caused more tissue damage and inflammation relative to the size of the animal in mice than in humans, such studies unnecessarily muddled a finding that local inflammation can result in the local release of adenosine with analgesic effect."
== Further reading == Dimachkie, Mazen M.; Barohn, Richard J. (7 April 2013). "Chronic Inflammatory Demyelinating Polyneuropathy". Current Treatment Options in Neurology. 15 (3): 350–366. doi:10.1007/s11940-013-0229-6. ISSN 1092-8480. PMC 3987657. PMID 23564314. Katirji, Bashar; Kaminski, Henry J.; Ruff, Robert L. (2013-10-11). Neuromuscular Disorders in Clinical Practice. Springer Science & Business Media. ISBN 9781461465676. Retrieved 26 August 2016. Said, Professor Gérard (2014). Peripheral Neuropathy & Neuropathic Pain: Into The Light. tfm Publishing Limited. p. 17. ISBN 9781910079027. Retrieved 3 August 2016.
Sources: en.wikipedia.org
{\displaystyle {\frac {\mathrm {d} \left[\mathrm {M} _{1}\right]}{\mathrm {d} \left[\mathrm {M} _{2}\right]}}={\frac {\left[\mathrm {M} _{1}\right]\left(r_{1}\left[\mathrm {M} _{1}\right]+\left[\mathrm {M} _{2}\right]\right)}{\left[\mathrm {M} _{2}\right]\left(\left[\mathrm {M} _{1}\right]+r_{2}\left[\mathrm {M} _{2}\right]\right)}}}
In Warwick 1816, a farm laborer was tried and convicted of the murder of a young maidservant. She had been drowned in a shallow pool and bore the marks of violent assault. The police found footprints and an impression from corduroy cloth with a sewn patch in the damp earth near the pool. There were also scattered grains of wheat and chaff. The breeches of a farm labourer who had been threshing wheat nearby were examined and corresponded exactly to the impression in the earth near the pool. An article appearing in Scientific American in 1885 describes the use of microscopy to distinguish between the blood of two persons in a criminal case in Chicago.
In castrated immature male rats, vosilasarm (at 10 mg/kg/day orally, the highest assessed dose) maximally stimulated prostate weight to 67%, seminal vesicle weight to 59%, and levator ani muscle weight to 117% compared to that induced with testosterone propionate 1 mg/kg/day. Moreover, when combined with testosterone propionate, vosilasarm partially antagonized the weight increases of the prostate gland and seminal vesicles, reducing them to 84% and 78% (both from 100%), respectively. Conversely however, the combination of testosterone propionate and vosilasarm was additive in terms of levator ani muscle weight stimulation, increasing it to 124%. Vosilasarm was found to stimulate muscle at a dose much lower than that required to stimulate the prostate. A dose of 0.3 mg/kg/day stimulated levator ani muscle weight to a similar extent relative to the levator ani weight in non-castrated controls. Conversely, a 33-fold higher dose of 10 mg/kg/day was required to stimulate prostate weight to a similar extent as that in non-castrated controls. Similarly, in gonadally intact immature rats, 0.3 mg/kg/day vosilasarm stimulated levator ani muscle weight to a similar extent as testosterone propionate 0.5 mg/kg/day, but a dose of 30 mg/kg/day (100-fold higher) was required to stimulate the prostate to a similar extent as testosterone propionate 0.5 mg/kg/day.
Aperture Desk Job is a free game set in the Portal universe released on March 1, 2022. It is a demonstration of the various features of the Steam Deck handheld system. In the game, the player works as a quality assurance checker for toilets manufactured by Aperture Science in its early years. They are guided by the personality core Grady through the steps, but as the game progresses, mishaps in the automated factory lead Grady to suggest that the player develop a weaponized toilet as an invention to pitch to Cave Johnson.
Sources: en.wikipedia.org
Ipamorelin is a synthetic pentapeptide that stimulates growth hormone release by activating the ghrelin receptor. It is handled as a research tool rather than as a licensed therapeutic product. Its short chain length makes it comparatively simple to synthesize and analyze.
Both bind the same receptor, but ghrelin is a 28-amino-acid hormone with roles in appetite and energy balance. Ipamorelin is a much smaller synthetic peptide selected for growth hormone release with limited effect on appetite signaling in animal models. The full overlap between their effects is not completely mapped.
Most published data come from animal studies and a small number of human trials. Findings on growth hormone release are reasonably consistent, while long-term effects and direct comparisons with other secretagogues remain incompletely studied. Open questions include duration of action across different populations.
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。