ACTH analog is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2025-11-08. Where a claim depends on a specific study, the study is described rather than over-claimed.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
该化合物于二十世纪八十年代在俄罗斯被开发，相关工作由俄罗斯科学院分子遗传学研究所的研究团队主导。开发目标并非复制 ACTH 的完整激素活性，而是寻找保留其神经作用方向、同时去除促肾上腺皮质激素释放效应的短肽片段。研究记录显示，这一方向促成了多个相关短肽的合成与筛选，而 Semax 是其中被研究最广泛的一个。当地文献常以 Семакс 这一名称指代它。
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
=== First signs === The first sign of flerovium was found in December 1998 by a team of scientists at Joint Institute for Nuclear Research (JINR), Dubna, Russia, led by Armenian nuclear scientist Yuri Oganessian, who bombarded a target of plutonium-244 with accelerated nuclei of calcium-48:
Benfluorex, sold under the brand name Mediator, is an anorectic and hypolipidemic agent that is structurally related to fenfluramine (a substituted amphetamine). It acts mostly as a prodrug of norfenfluramine. It was fraudulently claimed to improve glycemic control and decrease insulin resistance in people with poorly controlled type-2 diabetes through norfenfluramine acting as a 5-HT2B receptor agonist It was on the market between 1976 and 2009, and is thought to have caused between 500 and 2,000 deaths. It was patented and manufactured by the French pharmaceutical company Servier. However, Servier has wittingly concealed the nature of Benfluorex, so that it would avoid the ban of Fenfluramine-related medications, which were mostly marketed by Servier (Racemic Fenfluramine/Ponderal, Dexfenfluramine/Isomeride) Servier has been found to be aware of the Fenfluramine-structure nature when starting marketing Benfluorex as an anti diabetic. The mechanism of action of Benfluorex was the anoretic property that is shared with the other Fenfluramine-related compounds. In fact, Benfluorex acts as a prodrug to norfenfluramine, a worldwide withdrawn anorectic because of its high incidence of cardiac fibrosis which is completely out of line for treating type 2 diabetes.
On April 17, Ty Cobb, a former member of Trump's legal counsel during his first term in office, claimed that Trump displayed symptoms of dementia, characterizing the linguistic changes displayed in the Truth Social posts as "suggestive of the absence of any frontal lobe controls." Cobb additionally highlighted the late-night timestamps of the posts and Trump's apparent dozing off at Cabinet meetings as aligning with sleep cycle reversals seen in Alzheimer's disease, claiming that the combination of these behavioral traits characterized an acceleration in cognitive decline. White House spokesman David Ingle responded to both Crockett and Cobb's comments by praising Trump's "sharpness, unmatched energy, and historic accessibility" while accusing Crockett of aiding in an alleged cover-up of Joe Biden's mental decline as president and characterizing Cobb as "[a] severe case of Trump Derangement Syndrome." NATO official Paul Fritch also contested the mental illness characterization, speculating that Trump's behavior was instead the result of frustration towards his inability to bring the Iran war to a quick resolution. On June 2, journalist Aaron Rupar tweeted that Trump had made no public appearances since May 27 when he had attended a Cabinet meeting with a pre-recorded interview being released during that time, in response many commentors questioned the apparent pattern of Trump disappearing from public commitments for about a week each month.
The Scar Free Foundation is a medical research charity focused on scar free healing. It was founded in 1998 by plastic surgeon Michael Brough, following his work with survivors of the King's Cross Fire in London. Initially known as The Healing Foundation, it was relaunched as The Scar Free Foundation in 2016. The charity funds medical research into wound healing and scarring conditions. Current research is focused on identifying the pathways that lead to scarring, developing new treatment options, and improving the psychological outcomes and quality of life of patients currently living with scars. The current Chairman is former Medical Director of the NHS, Sir Bruce Keogh, and the Chief Executive is Richard Nugee CB CVO CBE. Peter Weissberg CBE is the Research Council Chairman. Sophie, Duchess of Edinburgh is the charity's Royal Patron. Notable Ambassadors include Simon Weston CBE and Pam Warren.
First proposed in 1972 by Meldner, such a reaction might enable the production of macroscopic quantities of superheavy elements within the island of stability; the role of fission in intermediate superheavy nuclides is highly uncertain, and may strongly influence the yield of such a reaction.
Sources: en.wikipedia.org
Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. Stretching across the Horn of Africa, it borders Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, the Gulf of Aden to the north, and the Indian Ocean to the east. Somalia has the longest coastline on Africa's mainland. Somalia has an estimated population over 19 million, of which 2.7 million live in the capital and largest city, Mogadishu. As one of Africa's most ethnically homogeneous countries, around 85% of its residents are ethnic Somalis. The official and national language of the country is Somali, and Arabic is recognised as a second language. The overwhelming majority of the population are Sunni Muslims. In ancient history, Somalia was an important commercial centre. During the Middle Ages, several powerful Somali empires dominated the regional trade, including the Ajuran Sultanate, Adal Sultanate, and the Sultanate of the Geledi. In the late 19th century, the Somali sultanates were colonised by the Italian and British empires, who merged these tribal territories into two colonies: Italian Somaliland and British Somaliland. In 1960, the two territories united to form the independent Somali Republic under a civilian government. Siad Barre of the Supreme Revolutionary Council (SRC) seized power in 1969 and established the Somali Democratic Republic, launching a failed invasion of Ethiopia which triggered major instability in Somalia and brutally attempting to quash the Somaliland War of Independence in the north of the country.
=== History === Cornish-Bowden, Athel (1997). New Beer in an Old Bottle. Eduard Buchner and the Growth of Biochemical Knowledge. Valencia: Universitat de Valencia. ISBN 978-84-370-3328-0. Archived from the original on 13 December 2010. Retrieved 8 December 2007., A history of early enzymology. Williams, Henry Smith (1904). Modern Development of the Chemical and Biological Sciences. A History of Science: in Five Volumes. Vol. IV. New York: Harper and Brothers. Archived from the original on 9 May 2012. Retrieved 8 December 2007., a textbook from the 19th century.
=== Assessment and physical examination === Catatonia is often overlooked and under-diagnosed. Most patients present with an underlying psychiatric disorder, which can obscure recognition of catatonia. For example, psychotic symptoms may dominate the clinical picture, while classic catatonic features (such as mutism or posturing) are absent. Motor abnormalities can also be misleading; in mania, increased motor activity is typically goal-directed, whereas in excited catatonia, activity is non–goal-directed and repetitive. Careful observation of motor behavior is therefore crucial for diagnosis. Catatonia remains a clinical diagnosis with no specific laboratory test to diagnose it. However, supportive investigations may help identify underlying causes:
About 89 percent of the bank's $172 billion in deposit liabilities exceeded the maximum insured by the FDIC. Two days after the failure, the FDIC received exceptional authority from the Treasury and announced jointly with other agencies that all depositors would have full access to their funds the next morning. Seeking to auction off all or parts of the bank, the FDIC reopened it on Monday March 13 as a newly organized bridge bank, Silicon Valley Bridge Bank, N.A. Although some characterized the government response as a bailout, the plan did not entail rescuing the bank, its management or shareholders, but rather making uninsured depositors whole from the proceeds of selling the bank's assets, without the use of taxpayer money. The collapse of SVB had significant consequences for startup companies in the U.S. and abroad, with many briefly unable to withdraw money from the bank. Other large technology companies, media companies, and wineries were also affected. For a number of founders and their venture capital backers, this was the bank of choice.
Sources: en.wikipedia.org
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
不是。Semax 是完全人工合成的七肽，自然界中没有对应的已知肽段。它的设计灵感来自促肾上腺皮质激素片段 ACTH(4-10)，但序列经过了替换和延长。