ACTH(4-10) raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-09-22. Anything still debated is marked as such rather than presented as settled.
The peptide is prone to several degradation pathways. Oxidation of the methionine residue produces a sulfoxide that elutes close to the parent peak in many chromatographic systems. Hydrolysis of peptide bonds and deamidation of susceptible residues in related sequences also reduce purity over time. Lyophilised material kept dry at minus twenty degrees Celsius and shielded from light is the most stable form commonly described in laboratory practice.
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
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.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
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.
| Property | Value | Notes |
|---|---|---|
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility class | Freely soluble in water | Also dissolves in aqueous buffers |
| Typical storage temperature | -20 °C | Dry, desiccated, protected from light |
| Typical analytical method | RP-HPLC with UV detection | Often paired with LC-MS |
| Water content | Reported as Karl Fischer value | Freeze-dried material is hygroscopic |
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
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。
=== Neurotoxins === There is evidence that system Xc- may serve as an entry point for neurotoxins and viruses. β-N-methyl-L-alanine (BMAA) is an environmental neurotoxin that can act on system Xc- and inhibit cystine uptake. This leads to a decrease in glutathione levels and an increase in oxidative stress. BMAA can also be transported by system Xc- and lead to an increase in glutamate release and an increase in excitotoxicity. Therefore, BMAA prevents the positive effects of cystine uptake and creates the negative effects of increasing glutamate release.
After a period of rest and recovery, Zita found herself regularly going back to Europe for the weddings of her children. She decided to move back to the continent full-time in 1952 to Luxembourg to look after her aging mother. Maria Antonia died at the age of 96 in 1959. The bishop of Chur proposed to Zita that she move into a residence that he administered (formerly a castle of the Counts de Salis) at Zizers, Graubünden in Switzerland. As the castle had enough space for visits from her large family and a nearby chapel (a necessity for the devoutly-Catholic Zita), she accepted with ease. Zita occupied herself in her final years with her family. Although the restrictions on the Habsburgs entering Austria had been lifted, that applied only to those born after 10 April 1919. That meant that Zita could not attend the funeral of her daughter Adelheid in 1971, which was painful for her. She also involved herself in the efforts to have her deceased husband, the "Peace Emperor" canonised. In 1982, the restrictions were eased, and she returned to Austria after being absent for six decades. Over the next few years, the Empress made several visits to her former Austrian homeland and even appeared on Austrian television. In a series of interviews with the Viennese tabloid newspaper Kronen Zeitung, Zita expressed her belief that the deaths of Crown Prince Rudolf of Austria and his mistress Baroness Mary Vetsera, at Mayerling, in 1889, were not a double suicide but rather murder by French or Austrian agents.
Glyn Ford and Jonathan Simnett, Silver from the Sea, September/October 1982, Volume 33, Number 5, Saudi Aramco World Archived 2006-11-12 at the Wayback Machine Accessed 17 October 2005 Ballard, Robert D., 2000, The Eternal Darkness, Princeton University Press. Csotonyi, J. T.; Stackebrandt, E.; Yurkov, V. (4 July 2006). "Anaerobic Respiration on Tellurate and Other Metalloids in Bacteria from Hydrothermal Vent Fields in the Eastern Pacific Ocean". Applied and Environmental Microbiology. 72 (7): 4950–4956. Bibcode:2006ApEnM..72.4950C. doi:10.1128/AEM.00223-06. PMC 1489322. PMID 16820492. Koschinsky, Andrea; Garbe-Schönberg, Dieter; Sander, Sylvia; Schmidt, Katja; Gennerich, Hans-Hermann; Strauss, Harald (2008). "Hydrothermal venting at pressure-temperature conditions above the critical point of seawater, 5°S on the Mid-Atlantic Ridge". Geology. 36 (8): 615. Bibcode:2008Geo....36..615K. doi:10.1130/G24726A.1. Catherine Brahic (4 August 2008). "Found: The hottest water on Earth". New Scientist. Retrieved 18 June 2010.
Sources: en.wikipedia.org
== Environment == Penicillium expansum grows best in wet, cool (<25C) conditions. P. expansum was found to grow most efficiently in a temperature range of 15–27 degrees Celsius (~59–81 °F), with slower growth at lower and higher temperatures. P. expansum grows best in wet conditions; growth rate has been found to be fastest at a relative humidity of 90%. P. expansum infection acidifies host tissues via the secretion of organic acids, and that acidification enhances fungal development, indicating a link between environmental acidity and P. expansum virulence.
Duchenne muscular dystrophy (DMD) is a severe type of muscular dystrophy predominantly affecting males. The onset of muscle weakness typically begins around age four, with rapid progression. Initially, muscle loss occurs in the thighs and pelvis, extending to the arms, which can lead to difficulties in standing up. By the age of 12, most individuals with Duchenne muscular dystrophy are unable to walk. Affected muscles may appear larger due to an increase in fat content, and scoliosis is common. Some individuals may experience intellectual disability, and females carrying a single copy of the mutated gene may show mild symptoms. Duchenne muscular dystrophy is caused by mutations or deletions in any of the 79 exons encoding the large dystrophin protein, which is essential for maintaining the muscle fibers' cell membrane integrity. The disorder follows an X-linked recessive inheritance pattern, with approximately two-thirds of cases inherited from the mother and one-third resulting from a new mutation. Diagnosis can frequently be made at birth through genetic testing, and elevated creatine kinase levels in the blood are indicative of the condition. While there is no known cure, management strategies such as physical therapy, braces, and corrective surgery may alleviate symptoms. Assisted ventilation may be required in those with weakness of breathing muscles. Several drugs designed to address the root cause are currently available including gene therapy (Elevidys), and antisense drugs (Ataluren, Eteplirsen etc.).
1993/788) Legal Aid in Criminal and Care Proceedings (General) (Amendment) Regulations 1993 (S.I. 1993/789) Legal Advice and Assistance (Amendment) Regulations 1993 (S.I. 1993/790) Measuring Instruments (EEC Requirements) (Fees) Regulations 1993 (S.I. 1993/798) Public Lending Right (Increase of Limit) Order 1993 (S.I. 1993/799)
Evidence suggests that, although survival rates have improved with modern medical treatment, in patients with moderate to severe poisoning up to half of those who did recover suffered permanent liver damage. However, a follow-up study has shown that most survivors recover completely without any sequelae if treated within 36 hours of mushroom ingestion.
Sources: en.wikipedia.org
=== Diseases === Interferon beta-1a and interferon beta-1b are used to treat and control multiple sclerosis, an autoimmune disorder. This treatment may help in reducing attacks in relapsing-remitting multiple sclerosis and slowing disease progression and activity in secondary progressive multiple sclerosis. Interferon therapy is used (in combination with chemotherapy and radiation) as a treatment for some cancers. This treatment can be used in hematological malignancy, such as in leukemia and lymphomas including hairy cell leukemia, chronic myeloid leukemia, nodular lymphoma, and cutaneous T-cell lymphoma. Patients with recurrent melanomas receive recombinant IFN-α2b. Both hepatitis B and hepatitis C can be treated with IFN-α, often in combination with other antiviral drugs. Some of those treated with interferon have a sustained virological response and can eliminate hepatitis virus in the case of hepatitis C. The most common strain of hepatitis C virus (HCV) worldwide—genotype I— can be treated with interferon-α, ribavirin and protease inhibitors such as telaprevir, boceprevir or the nucleotide analog polymerase inhibitor sofosbuvir. Biopsies of patients given the treatment show reductions in liver damage and cirrhosis. Control of chronic hepatitis C by IFN is associated with reduced hepatocellular carcinoma. A single nucleotide polymorphism (SNP) in the gene encoding the type III interferon IFN-λ3 was found to be protective against chronic infection following proven HCV infection and predicted treatment response to interferon-based regimens.
==== Receptor and ion channel targets ==== Caffeine is an antagonist of adenosine A2A receptors, and knockout mouse studies have specifically implicated antagonism of the A2A receptor as responsible for the wakefulness-promoting effects of caffeine. Antagonism of A2A receptors in the ventrolateral preoptic area (VLPO) reduces inhibitory GABA neurotransmission to the tuberomammillary nucleus, a histaminergic projection nucleus that activation-dependently promotes arousal. This disinhibition of the tuberomammillary nucleus is the downstream mechanism by which caffeine produces wakefulness-promoting effects. Caffeine is an antagonist of all four adenosine receptor subtypes (A1, A2A, A2B, and A3), although with varying potencies. The affinity (KD) values of caffeine for the human adenosine receptors are 12 μM at A1, 2.4 μM at A2A, 13 μM at A2B, and 80 μM at A3. Antagonism of adenosine receptors by caffeine also stimulates the medullary vagal, vasomotor, and respiratory centers, which increases respiratory rate, reduces heart rate, and constricts blood vessels. Adenosine receptor antagonism also promotes neurotransmitter release (e.g., monoamines and acetylcholine), which endows caffeine with its stimulant effects; adenosine acts as an inhibitory neurotransmitter that suppresses activity in the central nervous system. Heart palpitations are caused by blockade of the A1 receptor. Because caffeine is both water- and lipid-soluble, it readily crosses the blood–brain barrier that separates the bloodstream from the interior of the brain.
Sydenham's Laudanum: "According to the Paris Codex this is prepared as follows: opium, 2 ounces; saffron, 1 ounce; bruised cinnamon and bruised cloves, each 1 drachm; sherry wine, 1 pint. Mix and macerate for 15 days and filter. Twenty drops are equal to one grain of opium." Rousseau's Laudanum: "Dissolve 12 ounces white honey in 3 pounds warm water, and set it aside in a warm place. When fermentation begins add to it a solution of 4 ounces selected opium in 12 ounces water. Let the mixture stand for a month at a temperature of 86° Fahr.; then strain, filter, and evaporate to 10 ounces; finally strain and add 41⁄2 ounces proof alcohol. Seven drops of this preparation contain about 1 grain of opium." Tincture of Opium (Laudanum), U.S.P., attributed to the United States Pharmacoepia of 1863: "Macerate 21⁄2 ounces opium, in moderately fine powder in 1 pint water for 3 days, with frequent agitation. Add 1 pint alcohol, and macerate for 3 days longer. Percolate, and displace 2 pints tincture by adding dilute alcohol in the percolator."
In April 2017, a case was filed by lawyer Jude Sabio before the International Criminal Court (ICC), charging Duterte and 11 other officials with crimes against humanity in relation to the deaths of the controversial war on drugs; in response, outgoing ICC chief prosecutor Fatou Bensouda in early 2018 launched a preliminary examination into the charges against the accused. This prompted Duterte in March 2018 to initiate the withdrawal of the Philippines from the ICC, which took effect on March 17, 2019. Duterte rebuked the idea of allowing foreigners to meddle in the country's justice system and his administration emphasized that cases against him should be filed before the national courts. Additionally, he argued that the Rome Statute, which was ratified by the Senate in 2011, was never binding in the Philippines as it was never published in the Official Gazette, a requirement for a law in the country to take effect. For its part, the ICC reiterated that it maintains jurisdiction over crimes which took place before the withdrawal. Stating that his 2017 case was an orchestrated move by the Liberal Party, notably Senators Antonio Trillanes and Leila de Lima, to discredit Duterte, Sabio retracted his allegations in January 2020 and requested the ICC to dismiss the case. The ICC rejected Sabio's request and asserted that it "cannot effectively destroy or return information once it is in its possession or control".
==== Reliance on industry giants ==== Training frontier AI models requires an enormous amount of computing power. Usually only Big Tech companies have the financial resources to make such investments. Smaller start-ups such as Cohere and OpenAI end up buying access to data centers from Google and Microsoft respectively.
Sources: en.wikipedia.org
Reversed-phase high-performance liquid chromatography is the standard method, with detection in the ultraviolet range. Peak area percentage yields a purity figure for the main component. Mass spectrometry is normally run alongside to confirm molecular identity.
Dry lyophilised powder is generally kept at minus twenty degrees Celsius, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they encourage aggregation and moisture uptake. Solutions are less stable than the solid form and degrade faster at room temperature.
A certificate documents what the supplier measured, not what an independent party confirmed. Methods, instruments and acceptance criteria can differ between suppliers. Third-party testing is the usual way to resolve discrepancies.
Semax is based on the ACTH(4-10) fragment, a seven-amino-acid segment of adrenocorticotropic hormone. The synthetic peptide retains the core sequence while removing regions associated with endocrine activity. This modification is intended to isolate effects on the nervous system.