If you have been reading about ACTH(4-10) and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2026-05-28. Where a claim depends on a specific study, the study is described rather than over-claimed.
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。
=== Polish === Very long Polish words can be created as adjectives from numerals and nouns. For example, Dziewięćsetdziewięćdziesięciodziewięcionarodowościowego, 54 letters, is the genitive singular form of an adjective meaning roughly "of nine-hundred and ninety-nine nationalities". Similar words are rather artificial compounds, constructed within allowed grammar rules, but are seldom used in spoken language, although they are not nonsense words. It is possible to make even longer words in this way, for example: Dziewięćsetdziewięćdziesiątdziewięćmiliardówdziewięćsetdziewięćdziesiątdziewięćmilionów-dziewięćsetdziewięćdziesiątdziewięćtysięcydziewięćsetdziewięćdziesięciodziewięcioletniego (176 letters, meaning "of 999,999,999,999 years old"). One of the longest common words is 31-letter dziewięćdziesięciokilkuletniemu – the dative singular form of "ninety-and-some years old one". Another known long word is konstantynopolitańczykowianeczka (32 letters), "a daughter of a man who lives in Constantinople" and pięćdziesięciogroszówka (23 letters), "a 50 groszy coin".
Many groups have sought recognition by the federal government as Cherokee tribes, but today there are only three groups so recognized. Cherokee Nation spokesman Mike Miller has said that some groups, which he calls Cherokee Heritage Groups, are encouraged. Others have created controversy by their attempts to gain economically through their claims to be Cherokee. The three federally recognized groups say that only they have the legal right to present themselves as Cherokee Indian Tribes. The Mount Tabor Indian Community was recognized as a tribe by the State of Texas in 2017. Cherokee descendants must trace lineal descent from one or more of the six progenitor families. All citizens of the Cherokee Nation must be original enrollees or descendants of original enrollees listed on the Dawes Commission Rolls.
In February 2005, Bagwell and Biggio were jointly inducted into the Texas Sports Hall of Fame. Shortly after the 2005 season began, the chronic arthritic condition in his shoulder that had begun in 2001 finally sidelined him, rendering him inactive for three-quarters of the season. The former Gold Glove winner was now a defensive liability with a severely limited throwing arm; he had to "push" the ball instead of throwing it. Teams began taking advantage of his defensive weakness. Once possessing great ability to throw out the lead runner at third base ahead on bunt plays, Bagwell found it difficult to practice with the other infielders between innings. Concurrently, Bagwell's offensive production suffered, and pressure mounted on Astros management to bench the perennial All-Star; the club had started the season with a 15–30 won–loss record. He hit his last major league home run against Maddux on April 29, tying him for the most against any pitcher with seven. Bagwell continued to play through the pain until, after going 0-for-5 in a loss to the Pirates on May 4, it became so unbearable that he asked manager Phil Garner to remove him from the lineup the following day. He had hit just .250 with three home runs in 88 at-bats. The Astros placed him on the disabled list a few days later, and shoulder surgery followed. The Astros dramatically improved after their poor start to finish 74–43 over their final 117 games and capture the NL wild card.
Sources: en.wikipedia.org
== Early life == Peters was born Braden Eric Peters to a businessman father and stay-at-home mother. He was raised in Hoboken, New Jersey, and attended Seton Hall Preparatory School in West Orange, New Jersey. He has stated that he became interested in looksmaxxing—a term originating on incel message boards in the early 2010s that describes the process of making oneself as physically attractive as possible—in high school, which he has attributed to wanting to influence others politically by becoming more attractive. Peters described his life during the COVID-19 lockdowns as being "online for 14 hours a day", browsing looksmaxxing forums, playing Grand Theft Auto V and skipping online classes. Peters has stated in interviews that he would often hide his testosterone supplements from his parents, and when caught, he would be sent to live with his grandmother. Peters claims to have been expelled after "just three weeks" from Sacred Heart University in Fairfield, Connecticut for his use of "peptides and 'roids".
=== Carbon metabolism === Clostridium scindens can anaerobically ferment several different carbon sources, including monosaccharides (fructose, galactose, glucose, mannose, ribose, and xylose), a disaccharide (lactose), and a couple of 2-sugar alcohols (dulcitol and sorbitol). Glucose metabolism takes the form of mixed acid fermentation, as the fermentation products include acetate, ethanol, and formate. In defined and minimal media, the preferred glucose fermentation product for C. scindens is ethanol, while the production of hydrogen, acetate, and formate significantly decreases during growth in minimal media.
== Toponym == The name of the town was attested in 1489, even before it was founded by François I in the form le Hable de Grace then Ville de Grace in 1516, two years before its official founding. The learned and transient name of Franciscopolis in tribute to the same king, is encountered in some documents then that of Havre Marat, referring to Jean-Paul Marat during the French Revolution but was not imposed. However it explains why the complementary determinant -de-Grace was not restored. This qualifier undoubtedly referred to the Chapel of Notre Dame located at the site of the cathedral of the same name. The chapel faced the Chapel Notre Dame de Grace of Honfleur across the estuary. The common noun havre meaning 'port' was out of use at the end of the 18th or beginning of the 19th centuries but is still preserved in the phrase havre de paix meaning 'safe haven'. It is generally considered a loan from Middle Dutch from the 12th century. A Germanic origin can explain the "aspiration" of the initial h. Havre de Grace, Maryland, in the United States retains the de Grace from colonial times. New research however focuses on the fact that the term was attested very early (12th century) and in Norman texts in the forms Hable, hafne, havene, havne, and haule makes a Dutch origin unlikely.
The large spectrum of cancer phenotypes due to mutations in the TP53 gene is also supported by the fact that different isoforms of p53 proteins have different cellular mechanisms for prevention against cancer. Mutations in TP53 can give rise to different isoforms, preventing their overall functionality in different cellular mechanisms and thereby extending the cancer phenotype from mild to severe. Recent studies show that p53 isoforms are differentially expressed in different human tissues, and the loss-of-function or gain-of-function mutations within the isoforms can cause tissue-specific cancer or provide cancer stem cell potential in different tissues. TP53 mutation also hits energy metabolism and increases glycolysis in breast cancer cells.
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.