Semax raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2026-01-06 and is reviewed periodically as new material appears.
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
Identity and purity are established with standard peptide methods. Reversed-phase HPLC with ultraviolet detection near 214 nm resolves the parent peak from deletion and truncation byproducts, and reports typically quote a main-peak percentage. Mass spectrometry by electrospray or MALDI-TOF confirms the expected molecular mass, while amino acid analysis or peptide mapping can verify composition when the sequence itself is in question. A certificate of analysis that pairs a chromatogram with a mass spectrum is more informative than a purity figure alone. Counter-ion content and residual solvents are separate specifications and are frequently omitted.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Solid storage temperature | -20 °C or below | Desiccated and protected from light |
| Solution storage temperature | -80 °C as single-use aliquots | Avoid repeated freeze-thaw cycles |
| Purity assessment method | RP-HPLC, around 214 nm | Reported as main-peak area percent |
| Identity confirmation method | ESI-MS or MALDI-TOF | Measured mass compared with calculated mass |
| Common synonyms | ACTH(4-10) analog; Met-Glu-His-Phe-Pro-Gly-Pro | Also written as Semaxum in some sources |
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
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。
Glucagon is a hormone that generally opposes the action of insulin. It increases blood glucose by stimulating the production of glucose in the liver via glycogenolysis (breakdown of glycogen) and gluconeogenesis (production of glucose from non-carbohydrate sources). Glucagon also increases the breakdown of lipids and amino acids and the production of ketones. Unlike currently approved weight loss drugs, glucagon receptor agonists increase energy expenditure. Combination GLP-1/glucagon receptor agonists provide the thermogenic benefits of glucagon activation while almost eliminating hyperglycemia induced by glucagon receptor activation. Several such drugs have reached human trials for obesity, diabetes, and non-alcoholic fatty liver disease but adverse effects have hampered development. The most advanced of these drugs is mazdutide which is in a phase III trial as of 2023.
Glucose + 2 NAD+ + 2 Pi + 2 ADP → 2 pyruvate + 2 NADH + 2 ATP + 2 H+ + 2 H2O + energy Starting with glucose, 1 ATP is used to donate a phosphate to glucose to produce glucose 6-phosphate. Glycogen can be converted into glucose 6-phosphate as well with the help of glycogen phosphorylase. During energy metabolism, glucose 6-phosphate becomes fructose 6-phosphate. An additional ATP is used to phosphorylate fructose 6-phosphate into fructose 1,6-bisphosphate by the help of phosphofructokinase. Fructose 1,6-biphosphate then splits into two phosphorylated molecules with three carbon chains which later degrades into pyruvate.
== Statement == Let P be an arbitrary point inside the triangle ABC. From P and ABC, define U, V, and W as the points where the angle bisectors of BPC, CPA, and APB intersect the sides BC, CA, AB, respectively. Then Barrow's inequality states that
Sources: en.wikipedia.org
=== Prenatal testing === Obtaining a prenatal diagnosis for an embryo or fetus in the womb is also possible, using fetal genetic material acquired through chorionic villus sampling. An amniocentesis can be performed if the pregnancy is further along, within 14–18 weeks. This procedure looks at the amniotic fluid surrounding the baby for indicators of the HD mutation. This, too, can be paired with exclusion testing to avoid disclosure of parental genotype. Prenatal testing can be done when parents have been diagnosed with HD, when they have had genetic testing showing the expansion of the HTT gene, or when they have a 50% chance of inheriting the disease. The parents can be counseled on their options, which include termination of pregnancy, and on the difficulties of a child with the identified gene. In addition, in at-risk pregnancies due to an affected male partner, noninvasive prenatal diagnosis can be performed by analyzing cell-free fetal DNA in a blood sample taken from the mother (via venipuncture) between six and 12 weeks of pregnancy. It has no procedure-related risk of miscarriage.
Colombia has free-trade zones (FTZ), such as Zona Franca del Pacifico, located in the Valle del Cauca, one of the most striking areas for foreign investment. The financial sector has grown favorably due to good liquidity in the economy, the growth of credit and the positive performance of the Colombian economy. The Colombian Stock Exchange through the Latin American Integrated Market (MILA) offers a regional market to trade equities. Colombia is now one of only three economies with a perfect score on the strength of legal rights index, according to the World Bank. Colombia is rich in natural resources, and it is heavily dependent on energy and mining exports. Colombia's main exports include mineral fuels, oils, distillation products, fruit and other agricultural products, sugars and sugar confectionery, food products, plastics, precious stones, metals, forest products, chemical goods, pharmaceuticals, vehicles, electronic products, electrical equipment, perfumery and cosmetics, machinery, manufactured articles, textile and fabrics, clothing and footwear, glass and glassware, furniture, prefabricated buildings, military products, home and office material, construction equipment, software, among others. Principal trading partners are the United States, China, the European Union and some Latin American countries. Non-traditional exports have boosted the growth of Colombian foreign sales as well as the diversification of destinations of export thanks to new free trade agreements.
=== May === 1 May – The FDA trade union announces plans to mount a legal challenge against the UK government's Safety of Rwanda Act amid concerns it breaches international law. MSPs vote 70–58 to defeat a motion of no confidence in the Scottish Government. 2 May – Local elections take place for councils and mayors in England and police and crime commissioners in England and Wales. The 2024 Blackpool South by-election is also held on the same day. John Swinney is set to become the next SNP leader and first minister after Kate Forbes confirms she will not seek the party's leadership. 3 May – With 90% of council election results announced, the Conservatives have lost over 400 council seats, while Labour regains control of Hartlepool, Redditch, Rushmoor and Thurrock Councils. Ben Houchen wins the Tees Valley mayoral election, retaining the seat for the Conservatives, while Labour win mayoral elections in the East Midlands, North East and York and North Yorkshire. Chris Webb wins the 2024 Blackpool South by-election, with a 26% swing to Labour. 2024 Peterborough City Council election: At 18, Daisy Creedon-Blakemore becomes the UK's youngest councillor after winning a seat for Labour in Peterborough City Council's Fletton and Woodston ward. 4 May 2024 London mayoral election: Labour's Sadiq Khan secures a third term as Mayor of London with 44% of the vote, beating the Conservative Susan Hall on 33%. 2024 West Midlands mayoral election: Labour's Richard Parker narrowly defeats the Conservative incumbent Andy Street to become Mayor of the West Midlands.
== General and cited references == Hartwig, Andrea (2013). "Cadmium and Cancer". Cadmium: From Toxicity to Essentiality. Metal Ions in Life Sciences. Vol. 11. pp. 491–507. doi:10.1007/978-94-007-5179-8_15. ISBN 978-94-007-5178-1. PMID 23430782. "Cadmium and you" (PDF). Bootle, UK: Health and Safety Executive. March 2010. Retrieved January 29, 2011. Shannon M. "Heavy Metal Poisoning", in Haddad LM, Shannon M, Winchester JF (editors): Clinical Management of Poisoning and Drug Overdose, Third Edition, 1998.
Sources: en.wikipedia.org
Each freeze-thaw cycle can degrade a fraction of the peptide and promote aggregation. Dividing a stock solution into single-use volumes removes repeated cycling as a variable. It also limits the time a thawed solution spends at room temperature.
A high main-peak percentage says little about identity, counter-ion content, or residual solvents. It also does not distinguish an isomer or a closely eluting analog. Mass confirmation and the accompanying documentation cover those gaps.
Salt form changes mass, solubility, and hygroscopicity, and acetate and trifluoroacetate salts behave differently in solution. Storage guidance still centers on -20 °C for powder and lower temperatures for solutions. The certificate should state which salt is present.
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.