A practical reference on Neurotrophic signalling: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-11-27. Anything still debated is marked as such rather than presented as settled.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
| Property | Value | Notes |
|---|---|---|
| Molecular weight | ~813.9 Da (free heptapeptide) | N-acetylated form is about 42 Da heavier |
| Residue count | 7 (heptapeptide) | Four residues from ACTH(4-10), three added |
| Appearance | White to off-white powder | Usually supplied lyophilized |
| Solubility class | Freely soluble in water | Also dissolves in DMSO and polar organic solvents |
| Related parent fragment | ACTH(4-10) | Parent motif is Met-Glu-His-Phe |
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
Development took place during the 1980s at institutes of the Russian Academy of Sciences, where peptide fragments of ACTH were screened for cognitive and neuroprotective effects. The compound received regulatory approval in Russia as a nasal preparation, marketed for conditions such as ischemic stroke, transient ischemic attacks, and optic nerve disorders. Registration in other countries has not followed. Most published clinical reports originate from a small number of Russian research groups, and independent replication outside that setting remains limited. The regulatory status therefore differs sharply between Russia and the rest of the world.
Laboratory work points toward modulation of neurotrophic signaling, particularly expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal tissue. Studies also describe effects on monoamine turnover, inflammatory mediators, and oxidative markers. These observations come mainly from animal models and cultured cells, so the causal chain in humans is not firmly established. Whether the reported molecular changes translate into measurable clinical benefit is an open question. Reviews generally present the mechanism as plausible rather than demonstrated.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
The compound was developed in the 1980s at the Institute of Molecular Genetics in Moscow, where it emerged from research on short ACTH fragments and their effects on the central nervous system. Russian pharmaceutical listings describe it as a nootropic and neuroprotective agent, most often formulated as nasal drops. It is not a marketed medicine in the United States or the European Union, and no pharmacopoeial monograph covers it. Consequently, most published clinical experience with the substance originates from a small number of research centres, mainly in Russia and neighbouring countries.
In the continental European countries occupied by the Axis powers, the native communist party usually led the armed resistance (guerrilla warfare and urban guerrilla warfare) against fascist military occupation. In Mediterranean Europe, the communist Yugoslav Partisans led by Josip Broz Tito effectively resisted the German Nazi and Italian Fascist occupation. In the 1943–1944 period, the Yugoslav Partisans liberated territories with Red Army assistance and established the communist political authority that became the Socialist Federal Republic of Yugoslavia. To end the Japanese occupation of China in continental Asia, Stalin ordered Mao Zedong and the Chinese Communist Party to temporarily cease the Chinese Civil War (1927–1949) against Chiang Kai-shek and the anti-communist Kuomintang as the Second United Front in the Second Sino-Japanese War (1937–1945). In 1943, the Red Army began to repel the Nazi invasion of the Soviet Union, especially at the Battle of Stalingrad (23 August 1942 – 2 February 1943) and at the Battle of Kursk (5 July – 23 August 1943). The Red Army then repelled the Nazi and Fascist occupation armies from Eastern Europe until the Red Army decisively defeated Nazi Germany in the Berlin Strategic Offensive Operation (16 April–2 May 1945). On concluding the Great Patriotic War (1941–1945), the Soviet Union was a military superpower with a say in determining the geopolitical order of the world.
=== Cleaning and water softening === A chelating agent is the main component of some rust removal formulations. Citric acid is used to soften water in soaps and laundry detergents. A common synthetic chelator is EDTA. Phosphonates are also well-known chelating agents. Chelators are used in water treatment programs and specifically in steam engineering. Although the treatment is often referred to as "softening", chelation has little effect on the water's mineral content, other than to make it soluble and lower the water's pH level.
=== The seismic cloak === However, it can be demonstrated through computation and visual simulation that the waves are in fact dispersed around the location of the building. The frequency range of this capability is shown to have no limitation regarding the radiated frequency. The cloak itself demonstrates no forward or back scattering; hence, the seismic cloak becomes an effective medium.
=== Early life === Because of his father's career as a foreign service officer, much of Platt's childhood was spent in Asia and Washington, D.C. Platt attended twelve different schools, including the American School in Japan, and has said "Even now I find myself envying people who have neighborhoods and roots." Platt's family made frequent trips back to Washington, where they held Redskins season tickets. Platt is also a fan of the Boston Red Sox. When he was nine years old, Platt and his family visited the Kennedy Center in Washington, where he watched a performance that helped inspire his acting career. "One of the performances that really made me want to be an actor started out with this probably 20-minute rambling, drunken monologue by this bum. And it was a young Morgan Freeman. I'll never forget it. This guy was just so riveting. He stood there on stage alone before the curtain went up, and he held this audience utterly rapt. Including myself, obviously." According to Platt, drama departments gave his childhood some stability, "It was something of a survival mechanism, in that it gave me a little subculture to plug into wherever I ended up. Kids need that. I certainly did."
Systemic-onset juvenile idiopathic arthritis (sJIA), also known as Still disease, Still's disease, and systemic juvenile idiopathic arthritis, is a subtype of juvenile idiopathic arthritis (JIA) that is distinguished by arthritis, a characteristic erythematous skin rash, and remitting fever. Fever is a common symptom in patients with sJIA, characterized by sudden temperature rise above 39°C and then a sudden drop. Over 80% of patients have a salmon-colored macular or maculopapular rash, which can be migratory and nonpruritic. Arthritis can develop weeks, months, or even years after onset and can affect various joints. SJIA is characterized by splenic and lymph node enlargements, with prominent symmetrical lymphadenopathy. Pericardial involvement is common, with 81% of children with active systemic symptoms having abnormal echocardiographic findings and 36% having an effusion or pericardial thickening. Around one-third of children with sJIA have occult macrophage activation syndrome (MAS), a potentially fatal illness causing T cells and macrophages to rapidly multiply and activate, resulting in a "cytokine storm." The cause of sJIA is currently unknown. While infectious organisms have been suggested as the cause, microbiologic and virologic analyses cannot pinpoint a single agent. sJIA is not an infectious disease by definition, but a genetic predisposition may play a role. It is considered an autoinflammatory condition, rather than an autoimmune disease, due to the lack of evidence linking specific antigen-antibody dyads.
Sources: en.wikipedia.org
The Trump administration authorizes its ambassador to Lebanon Michel Issa to hold talks with Hezbollah. August 27 Incidents at Six Flags parks: The X2 roller coaster at the Six Flags Magic Mountain amusement park in Valencia, California, closes after two riders were recently hospitalized for brain injuries including hemorrhages. The US states it disrupted a Chinese hacking campaign that targeted the Justice Department, NASA, the Federal Reserve, the Senate, and other important government entities. Trump signs an executive order to rename Lake Ontario as "Lake America" in federal agency usage. August 28 Protests against Donald Trump: Demonstrators gather in Washington, D.C. at the March on Washington 2026: Defend the Vote rally to protest against the Trump administration's efforts to roll back voting and civil rights, 63 years after the March on Washington rally by Martin Luther King Jr. 2026–27 NHL season: In ice hockey, the Colorado Avalanche sign defenceman and alternate captain Cale Makar to an eight-year extension worth $163.2 million, the largest contract in National Hockey League history. He is the first player to exceed $20 million in AAV (average annual value). Trump announces the establishment of a "Space Academy" to train future civilian and military recruits. Richmond, Virginia removes the last three Confederate statues, with the three removed are statues of Stonewall Jackson, former Governor William Smith, and Hunter McGuire.
Studies in the hematopoietic system disclosed that during endothelial to hematopoietic stem cell transition, ADGRG1 is a transcriptional target of the heptad complex of hematopoietic transcription factors, and is required for hematopoietic cluster formation. Recently, two studies showed that ADGRG1, is a cell autonomous regulator of oligodendrocyte development through Gα12/13 proteins and Rho activation. Della Chiesa et al. demonstrate that ADGRG1 is expressed on CD56dull natural killer (NK) cells. Lin and Hamann's group show all human cytotoxic lymphocytes, including CD56dull NK cells and CD27–CD45RA+ effector-type CD8+ T cells, express ADGRG1.
== References == This article was submitted to WikiJournal of Science for external academic peer review in 2017 (reviewer reports). The updated content was reintegrated into the Wikipedia page under a CC-BY-SA-3.0 license (2018). The version of record as reviewed is: Mike Christie; et al. (2018). "Radiocarbon dating" (PDF). WikiJournal of Science. 1 (1): 6. doi:10.15347/wjs/2018.006. Wikidata Q55120317.
=== Approval overview === Since 1996, seven novel insulin analogues have been approved. Three short-acting and four long-acting analogues have been made, while one short-acting lispro modification has been produced. Since 2021, three insulin biosimilars have been approved, two of which are long-acting and one of which is short-acting.
Sources: en.wikipedia.org
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.
Semax is a synthetic analog of the ACTH(4-10) fragment rather than a copy of the full hormone. Truncation plus the added tail removes the steroidogenic portion of ACTH. That distinction explains why it is studied for nervous-system effects instead of adrenal stimulation.
It is registered as a prescription product in Russia and has been used there clinically, chiefly by the intranasal route. No approval exists in the United States or the European Union. Availability elsewhere typically falls under research-chemical distribution, with varying purity documentation.
It is a synthetic peptide of seven amino acids. Its backbone corresponds to a fragment of adrenocorticotropic hormone extended at the carboxyl end. The material is distributed as a lyophilized solid for laboratory use.