The short version of intranasal route fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-05-18 and is reviewed periodically as new material appears.
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.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
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。
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。
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C37H51N9O10S | Seven-residue peptide |
| Molecular mass | 813.9 Da | Monoisotopic value |
| Appearance | White to off-white powder | Lyophilized form |
| Solubility | Freely soluble in water | Also soluble in saline and polar solvents |
| Storage (dry) | -20 °C or lower | Desiccated, protected from light |
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.
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.
Pharmacological accounts link semax to melanocortin signalling and to modulation of neurotrophic factor expression, particularly brain-derived neurotrophic factor and nerve growth factor. Much of this evidence comes from rodent studies using intranasal delivery, a route chosen because it allows peptides to reach the central nervous system with limited systemic exposure. Whether the same mechanisms operate in humans at comparable magnitude remains an open question. The precise receptor or receptors responsible for the reported behavioural and neuroprotective effects have not been conclusively identified.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
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.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
== Techniques == Laboratory techniques are the set of procedures used on natural sciences such as chemistry, biology, physics to conduct an experiment; while some of them involve the use of complex laboratory equipment from laboratory glassware to electrical devices, and others require more specific or expensive supplies.
Seizures Syndrome of inappropriate secretion of antidiuretic hormone Blood dyscrasias including: Agranulocytosis Thrombocytopenia Eosinophilia Leukopenia Myocardial infarction Heart block QTc interval prolongation Sudden cardiac death Depression worsening Suicidal ideation
==== Complement Activation ==== The complement system includes blood proteins that can cause cell death after an antibody binds to the cell surface (the classical complement pathway, among the ways of complement activation). Generally, the system deals with foreign pathogens but can be activated with therapeutic antibodies in cancer. The system can be triggered if the antibody is chimeric, humanized, or human; as long as it contains the IgG1 Fc region. Complement can lead to cell death by activation of the membrane attack complex, known as complement-dependent cytotoxicity; enhancement of antibody-dependent cell-mediated cytotoxicity; and CR3-dependent cellular cytotoxicity. Complement-dependent cytotoxicity occurs when antibodies bind to the cancer cell surface, the C1 complex binds to these antibodies and subsequently, protein pores are formed in cancer cell membrane. Blocking Antibody therapies can also function by binding to proteins and physically blocking them from interacting with other proteins. Checkpoint inhibitors (CTLA-4, PD-1, and PD-L1) operate by this mechanism. Briefly, checkpoint inhibitors are proteins that normally help to slow immune responses and prevent the immune system from attacking normal cells. Checkpoint inhibitors bind these proteins and prevent them from functioning normally, which increases the activity of the immune system. Examples include durvalumab, ipilimumab, nivolumab, and pembrolizumab.
==== Minds ==== By contrast to drones, Minds are orders of magnitude more powerful and intelligent than the Culture's other biological and artificial citizens. Typically they inhabit and act as the controllers of large-scale Culture hardware such as ships or space-based habitats. Unsurprisingly, given their duties, Minds are tremendously powerful: capable of running all of the functions of a ship or habitat, while holding potentially billions of simultaneous conversations with the citizens that live aboard them. To allow them to perform at such a high degree, they exist partially in hyperspace to get around hindrances to computing power such as the speed of light. Some inhabited planets and all orbitals have their own Minds: sapient, hyperintelligent machines originally built by biological species, which have evolved, redesigned themselves, and become many times more intelligent than their original creators. According to Consider Phlebas, a Mind is an ellipsoid object roughly the size of a bus and weighing around 15,000 tons. A Mind is in fact a 4-D entity, meaning that the ellipsoid is only the protrusion of the larger four dimensional device into our 3D 'real space'. In the Culture universe, Minds have become an indispensable part of the prevailing society, enabling much of its post-scarcity amenities by planning and automating societal functions, and by handling day-to-day administration with mere fractions of their mental power.
Sources: en.wikipedia.org
For example, the IRGC's involvement in border controls and critical transportation hubs, such as airports, allows it to bypass customs regulations, importing goods illicitly to maintain its economic advantage. This behavior often destabilizes local markets and contributes to food insecurity, as the organization's financial interests may not align with public needs. These activities highlight the IRGC's transition from a military and security body to a comprehensive socio-economic entity within Iran, wielding significant power over critical resources, including the food supply chain.
==== Keeping 17% of programs ==== On March 10, Secretary of State Marco Rubio announced that he was cancelling 83% of USAID programs, or approximately 5,200 out of 6,200 programs. The remaining 1,000 programs (approximately) would be moved to the Department of State. As of late March, DOGE no longer lists the details of canceled USAID contracts on its "Wall of Receipts". DOGE lists approximately $12 billion saved, although a former USAID analyst estimates the actual amount is closer to $6 or $7 billion. In early April, USAID announced it was adding back 14 nations to grants under the UN's World Food Programme. These nations include Lebanon, Syria, Somalia, Jordan, Iraq and Ecuador, plus the International Organization for Migration in the Pacific region. However, food aid was not restored to either Yemen or Afghanistan, with a State Department spokesperson saying this was "based on concern that the funding was benefiting terrorist groups, including the Houthis and the Taliban".
This transformation of obsidian is accelerated by the presence of water. Although newly formed obsidian has a low water content, typically less than 1% water by weight, it becomes progressively hydrated when exposed to groundwater, forming perlite.
The script was co-written by Paul Dehn, who had worked in the Special Operations Executive as an assassin during World War II. The film closely follows the plot of the original source text. One exception is that the name of the principal female character in the novel, Liz Gold, is changed to Nan Perry in the film, reputedly because Martin Ritt was worried about the potential confusion in the media with Burton's wife, Elizabeth Taylor. Le Carré's preferred choice was Rita Tushingham, he initially felt Bloom was "too beautiful, classy," but later changed his mind, feeling she provided a proper foil to Burton. Le Carré favoured Trevor Howard or Peter Finch for the role of Leamas, but they were rejected for not being enough of a box office draw; Burt Lancaster was also considered but was rejected for not being able to put on a convincing British accent. Richard Burton, the eventual choice of the producers, butted heads with director Martin Ritt during the course of the production. The atmosphere on set was also tense from both the presence of Burton's wife, Elizabeth Taylor, as well as the romantic history between co-stars Burton and Bloom. Burton had initially demanded Taylor play Perry, but Martin Ritt insisted on Bloom. Several of the key cast and crew were expatriate Americans who had been blacklisted, including director Martin Ritt, actor Sam Wanamaker and composer Sol Kaplan. Some of the cast and crew had previously worked on the James Bond films, including screenwriter Paul Dehn (who wrote Goldfinger) and actor Bernard Lee (the original M).
Eleven months after reimplantation, a viable intrauterine pregnancy was confirmed, which resulted in the first such live birth – a girl named Tamara. Therapeutic hypothermia, e.g. during heart surgery on a "cold" heart (generated by cold perfusion without any ice formation) allows for much longer operations and improves recovery rates for patients.
Sources: en.wikipedia.org
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.
The extension was introduced to slow enzymatic breakdown of the peptide in biological systems. Natural ACTH fragments are degraded rapidly by peptidases. Adding the tripeptide was intended to extend the window during which the molecule remains intact.
Most published work consists of animal experiments conducted in a small number of laboratories. Human data are limited in number and size. Whether the observed effects translate into reliable clinical benefit is still unresolved.
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。