A practical reference on Semax: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
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。
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 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.
| Property | Value | Notes |
|---|---|---|
| 化学类别 | 合成七肽 | ACTH(4-10) 结构类似物 |
| 氨基酸序列 | Met-Glu-His-Phe-Pro-Gly-Pro | 单字母写作 MEHFPGP |
| 分子量 | 约 813.9 Da | 随确切形式和盐型略有变化 |
| 常见同义词 | ACTH(4-10) 类似物 | 俄语文献称 Семакс |
| 开发来源 | 俄罗斯 | 二十世纪八十年代 |
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
The compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
CLIP or Class II-associated invariant chain peptide is the part of the invariant chain (Ii) that binds to the peptide binding groove of MHC class II and remains there until the MHC receptor is fully assembled. CLIP is one of the most prevalent self peptides found in the thymic cortex of most antigen-presenting cells. The purpose of CLIP is to prevent the degradation of MHC II dimers before antigenic peptides bind, and to prevent autoimmunity. During MHC II assembly in the endoplasmic reticulum, the invariant chain polypeptide complexes with MHC II heterodimers. In a late endosome/early lysosome, cathepsin S cleaves the invariant chain, leaving CLIP bound to the MHC II complex. In the presence of antigenic peptide fragments, HLA-DM partially binds to the MHC II peptide binding groove and acts as a catalyst, releasing CLIP and allowing peptides to bind. Antigenic peptides have a high affinity for the MHC II groove, and are readily exchanged for CLIP. This occurs in most cells expressing MHC II–however, in B cells, HLA-DO functions as the accessory protein. Both HLA-DM and HLA-DO interact with each other to act as chaperone proteins and prevent the denaturing of MHC II. MHC II with bound antigen is then transported to the plasma membrane for presentation. CLIP also can affect the differentiation of T cells. MHC II + CLIP complexes are upregulated on maturing dendritic cells, which activate and differentiate T cells into Thelper (Th) and Tcytotoxic (Tc) cells. Th cells can polarize into Th1 or Th2 effector cells depending on the presence of cytokines.
Portugal's main import markets in 2026 were Spain at 32.9% and Germany at 11.9%. Portugal's main imports are machinery and mechanical appliances, chemical products, agricultural products, and mineral fuels. Since the 1990s, Portugal's economic model has been based on public consumption and economic development focused on exports, private investment and the development of its high-tech sector. Consequently, business services have overtaken more traditional industries such as wine and cork in export earnings. Operated by the Euronext Lisbon, Portugal's stock market, the PSI, includes 16 major companies based on the country, including Sonae, Mota-Engil, Corticeira Amorim, The Navigator Company, and EDP. In 2025, Portugal ranked 16th among European Union member states in innovation by the European Innovation Scoreboard, while placing 31st worldwide in the Global Innovation Index. In 2024, neuroscience accounted for 12.5% of Portugal's scientific output, the second-highest national share, and the country ranked 23rd worldwide in total neuroscience output. Among the research institutions based in the country are the Gulbenkian Institute of Molecular Medicine, the International Iberian Nanotechnology Laboratory, and the Champalimaud Foundation which was the world's 11th top non-profit institution in neuroscience research between 2019 and 2023.
=== Side effects and contraindications === Research has shown a limited side effect profile for honokiol, and it appears to be well tolerated. However, its antithrombotic effects could cause hemorrhage especially in patients with conditions that would put them at a higher risk like hemophilia or Von Willebrand disease. Additionally, patients already taking anticoagulants should talk to their doctor before taking honokiol supplements. In a 2002 study, researchers induced cell death in fetal rat cortical neurons by directly applying 100μM in vitro.
Sources: en.wikipedia.org
Studies of known actinides and discoveries of further transuranic elements provided more data in support of this position, but the phrase "actinide hypothesis" (the implication being that a "hypothesis" is something that has not been decisively proven) remained in active use by scientists through the late 1950s. At present, there are two major methods of producing isotopes of transplutonium elements: (1) irradiation of the lighter elements with neutrons; (2) irradiation with accelerated charged particles. The first method is more important for applications, as only neutron irradiation using nuclear reactors allows the production of sizeable amounts of synthetic actinides; however, it is limited to relatively light elements. The advantage of the second method is that elements heavier than plutonium, as well as neutron-deficient isotopes, can be obtained, which are not formed during neutron irradiation. In 1962–1966, there were attempts in the United States to produce transplutonium isotopes using a series of six underground nuclear explosions. Small samples of rock were extracted from the blast area immediately after the test to study the explosion products, but no isotopes with mass number greater than 257 could be detected, despite predictions that such isotopes would have relatively long half-lives of α-decay. This non-observation was attributed to spontaneous fission owing to the large speed of the products and to other decay channels, such as neutron emission and nuclear fission.
=== Gastrointestinal connection === Gastrointestinal problems are one of the most commonly associated medical disorders in people with autism. These are linked to greater social impairment, irritability, behavior and sleep problems, language impairments and mood changes, so the theory that they are an overlap syndrome has been postulated. Studies indicate that gastrointestinal inflammation, food allergies, gluten-related disorders (celiac disease, wheat allergy, non-celiac gluten sensitivity), visceral hypersensitivity, dysautonomia and gastroesophageal reflux are the mechanisms that possibly link both. A 2016 review concludes that enteric nervous system abnormalities might play a role in several neurological disorders, including autism. Neural connections and the immune system are a pathway that may allow diseases originated in the intestine to spread to the brain. A 2018 review suggests that the frequent association of gastrointestinal disorders and autism is due to abnormalities of the gut–brain axis. The "leaky gut syndrome" hypothesis developed by Andrew Wakefield, known for his fraudulent study on another cause of autism, is popular among parents of children with autism. It is based on the idea that defects in the intestinal barrier produce an excessive increase in intestinal permeability, allowing substances present in the intestine (including bacteria, environmental toxins, and food antigens) to pass into the blood.
Overshadowing the decade was the collapse of Colombia's own World Cup. Awarded hosting rights to the 1986 FIFA World Cup in 1974, the country found FIFA's stadium, broadcasting and infrastructure requirements beyond its means as the economy contracted and internal violence escalated. In a televised address on 25 October 1982, President Belisario Betancur renounced the tournament, declaring that the golden rule "that the World Cup should serve Colombia, and not Colombia the World Cup multinational" had not been honoured and that the country had "no time to attend to the extravagances of FIFA and its partners". No nation had previously surrendered a World Cup already granted to it; FIFA reassigned the 1986 finals to Mexico. Construction already under way left a permanent legacy in the Estadio Metropolitano Roberto Meléndez in Barranquilla, later adopted as the national team's home ground.
Sources: en.wikipedia.org
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。
Semax 被描述为 ACTH(4-10) 的结构类似物，两者共享部分序列特征。它保留了该片段的部分神经相关活性方向，但去除了完整片段带来的激素释放效应。二者并非同一物质，也不能互相替代。
加入的 Pro-Gly-Pro 三肽被普遍认为能提升分子对蛋白水解酶的稳定性。这种设计让短肽在体内维持时间更长。具体延长的程度以及不同组织中是否一致，文献中仍存在不同报告。
It is a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.