This is a working overview of ACTH 片段, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-08-01 and is reviewed periodically as new material appears.
Regulatory status varies sharply by country. Semax is registered for medical use in Russia, where it appears in formularies as a nasal solution, and it also holds registration in a small number of neighbouring states. It has no approval from the United States Food and Drug Administration or the European Medicines Agency, and it is not a scheduled controlled substance in most jurisdictions. Elsewhere it circulates mainly as laboratory material, so purity documentation comes from suppliers rather than from a national pharmacopoeia.
Semax is a synthetic peptide created in the Soviet Union during the early 1980s by researchers working in Moscow. It was built from the short adrenocorticotropic hormone fragment known as ACTH(4-10), and the chain was then extended with three additional amino acids. The resulting molecule was named semax and entered clinical use in Russia in 1994. It is generally described as a nootropic and neuroprotective agent rather than as a hormone analogue.
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。
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。
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | Analogue of the ACTH(4-10) fragment |
| Amino acid sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Single-letter form MEHFPGP |
| Molecular formula | C37H51N9O10S | Free peptide, nominal mass near 814 Da |
| First registration | 1994, Russia | Nasal formulation for neurological indications |
| Typical purity grade | 95% or higher by HPLC | Research material; higher grades used as reference standards |
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
Lyophilized material is chemically stable for extended periods when kept dry, cold, and protected from light. The powder is hygroscopic, so vials should be warmed to room temperature before opening to reduce condensation on the contents. Once dissolved, the peptide is far less stable because peptide bonds are susceptible to hydrolysis and the methionine residue can oxidize. Solutions are typically aliquoted and held at 2-8 °C for short intervals or frozen for longer ones, and repeated freeze-thaw cycles should be avoided.
Routine characterization relies on reversed-phase high-performance liquid chromatography to establish purity and on mass spectrometry to confirm molecular identity. Electrospray ionization and matrix-assisted laser desorption ionization are both used for mass verification. Amino acid analysis and peptide mapping can detect sequence errors. Common impurities include truncated sequences, methionine sulfoxide formed by oxidation, and deamidated products. Chromatograms are usually recorded near 214 nm, where the peptide backbone absorbs, and purity is reported as the percentage area of the principal peak.
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.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
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.
=== Calcium ions === Calcium ions or cyclic AMP (cAMP) act as secondary messengers. This is an example of negative control. The calcium ions activate phosphorylase kinase. This activates glycogen phosphorylase and inhibits glycogen synthase.
=== Czech Republic === A member of Parliament is a member of either of the two chambers of the Parliament of the Czech Republic, although the term member of Parliament of the Czech Republic is commonly referred to as deputy of the Parliament of the Czech Republic (Czech: Poslanec Parlamentu České republiky), who is a member of the lower house of the Parliament, the Chamber of Deputies. For the upper house, the Senate, the term senator is used.
When fungal spores germinate, they initially form preliminary associations with common free-living algae in their vicinity. Additionally, the fungus can recruit compatible algal cells from neighboring lichen thalli—essentially extracting these partners—to help establish a complete symbiotic relationship. Native across Europe, parts of Asia, and coastal North Africa, X. parietina has a more limited and primarily coastal distribution in North America and Australia, where genetic evidence suggests human-mediated introduction. In recent decades, it has expanded inland in these regions, particularly in urban environments and areas affected by agricultural runoff, road salt application, and nitrogen deposition. The lichen grows slowly (averaging 2.6 mm (1⁄8 in) per year) but possesses considerable regenerative abilities, with fragments capable of developing into new thalli. It participates in a complex web of ecological interactions, hosting at least 41 species of lichen-dwelling fungi, while certain gastropods and microscopic rotifers contribute to its dispersal by consuming and excreting viable spores. The species has high diversity even within local populations, with distinct patterns linked to both geographic location and substrate type. This genetic variability, combined with the lichen's flexible associations with different photobiont strains, contributes to its ecological success. X. parietina serves as a bioindicator for monitoring air quality due to its capacity to accumulate environmental contaminants.
Sibabrata Mukhopadhyay, Mumu Chakraborty, Arun Bandyopadhyay, Dipak Kar, Tanima Banerjee, Aditya Konar, Debaprasad Jana, Siddhartha Roy, Santu Bandyopadhyay, Balram Ghosh, Mabalirajan Ulaganathan, Rakesh Johri, Subhash Sharma, Gurdarshan Singh, Bholanath Paul, Vasanta Madhava Sharma Gangavaram, Jhillu Singh Yadav, Radha Krishna Palakodety (August 2013). "Method for treatment of bronchial asthma (Patent US8519154B2)". {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link) Sujoy K Das Gupta, Abhik Saha, Archana Sharma, Siddhartha Roy, Bhabatarak Bhattacharya (January 2012). "Peptide antagonists for inhibiting heat shock protein (Hsp 16.3) of Mycobacterium tuberculosis (Patent 7569537)". Retrieved 15 October 2016.{{cite web}}: CS1 maint: multiple names: authors list (link) S. Bandyopadhay, B. Ghosh, Parasuraman Jaisankar, Bikas C Pal, Siddhartha Roy, Nath Paul, Arjun Ram, U. Mabalirajan, Nahid Ali, Arun Bandyopadhyay, Aditya Konar, J. B. Chakraborty, I. C. Mukherjee, Jaydeep Chaudhuri, Sanjit Kumar Mahato, A. Manna, Roma Sinha, Pradyot Bhattacharya, J. Vinayagam, Sudeshna Chowdhury (January 2012). "Substituted catechols as inhibitors of IL-4 and IL-5 for the treatment of bronchial asthma (WO Patent 2,012,140,574)". doi:10.13140/RG.2.1.2784.6488. Retrieved 15 October 2016. {{cite journal}}: Cite journal requires |journal= (help)CS1 maint: multiple names: authors list (link) 1st S. Bandyopadhay, B. Ghosh, Parasuraman Jaisankar, Bikas C Pal, Siddhartha Roy, Nath Paul, Arjun Ram, U.
West of the Porte Palatine stands the Quadrilatero Romano (Roman Quadrilateral), the old medieval district recently renewed. The current neighbourhood is characterised by its tiny streets and its several medieval buildings and today it is popular for its aperitivo bars and its small shops run by local artisans. The hub of the Quadrilatero is Piazza Emanuele Filiberto. South of the Quadrilatero Romano stands Via Garibaldi, another popular street of the city. It is a 1 km (0.6 mi) pedestrian street between Piazza Castello and Piazza Statuto which features some of the old shops of the city. Large Piazza Statuto is another example of Baroque square with arcades. Another main street of downtown is Via Pietro Micca, which starts in Piazza Castello and ends in the large Piazza Solferino. The street continues in Via Cernaia up to Piazza XVIII Dicembre, which features the former Porta Susa passengers building, relocated in 2012 a little more southward. The new and larger passengers building is situated between Corso Bolzano and Corso Inghilterra and is an example of contemporary architecture, being a 300 m-long (980 ft) and 19 m-high (62 ft) glass and steel structure. Porta Susa is currently the international central station of the city (high speed trains to Paris) and it is becoming the central hub of railway transportation of the city, being the station in which local trains (so-called Ferrovie Metropolitane), national trains and high-speed national and international trains converge. Close to Via Cernaia stands the Cittadella (Citadel), in the Andrea Guglielminetti garden.
Sources: en.wikipedia.org
== Amino acid profile == Hemp protein is rich in essential amino acids, containing, in sufficient quantities, all essential amino acids required by humans except lysine, which appears at lower than recommended levels for infants aged up to five years old according to Food and agricultural organization (FOA) standards; still, the overall nutritive value of hemp protein remains relatively good, as sulfur-containing amino acids are higher than in casein or soy, while other non-essential amino acids present in hemp protein, such as arginine, provide additional health benefits including cardiovascular support, immune function optimization, and muscle repair. Hemp protein has unique properties that are useful in food processing. Its cysteine-rich amino acid composition and high sulfhydryl (-SH)/disulfide (S-S) ratio offer a glimpse of its distinctive features. These features can facilitate the development of new food materials.
The number of events at the park grew significantly after its reopening, causing some consternation by people who feared that the park would be dominated by private entities, thus would be inaccessible to the public. As a result, BPC makes most events free and open to the public. One exception was the New York Fashion Week shows that formerly took over the park for two weeks in the winter and late summer each year. BPC cofounder Dan Biederman often publicly expressed his frustration that the fashion shows were not under BPC's control. "They pay us a million dollars. It's a million dollars I would happily do without," he told the Los Angeles Times. BPC was particularly frustrated that the fashion shows dominated the park during two crucial times: in late summer, when the weather is perfect for park visitors; and in early February, necessitating the early closure of the park's popular free-admission ice-skating rink.
== Signs and symptoms == People with hypothyroidism often have no or only mild symptoms. Numerous signs and symptoms are associated with hypothyroidism and can be related to the underlying cause, or a direct effect of not having enough thyroid hormones. Many symptoms of hypothyroidism are otherwise common and do not necessarily indicate thyroid problem. Hashimoto's thyroiditis may present with the mass effect of a goiter (enlarged thyroid gland). In middle-aged women, the symptoms may be mistaken for those of menopause.
The area of a familiar country, state or city is often used as a size reference, especially in journalism. Usually the region is used to describe something of similar size to the reference region, but in some cases such references become common enough that multiples of the area start to be used, as in "twice the area of Wales". Besides Wales (20,779 km2 (8,023 sq mi)), other regions that have been used this way include Belgium (30,528 km2 or 11,787 mi2), the German state of Saarland (2,569.69 km2 or 992.16 mi2), and Washington, D.C. (61.4 mi2 or 159 km2).
Sources: en.wikipedia.org
Complementary protein combinations make for delicious recipes – they are combinations that formed the basis of the world's traditional cuisines. We use them naturally in our cooking without even being aware of it. The three most common complementary protein combinations are: Grains (rice, corn, wheat, barley, etc.) + legumes (peas, beans, lentils) Grains and milk products Seeds (Sesame or sunflower) +legumes In 1975, both Vogue and American Journal of Nursing carried articles describing the principles and practice of protein combining. For a time, The American National Research Council and the American Dietetic Association (ADA) cautioned vegetarians to be sure to combine their proteins. Protein combining reached the pages of a general chemistry textbook in 1982:
The name has its origin in the belief that just as St Peter holds the keys to heaven, the effects of the cactus allow users "to reach heaven while still on earth." In 2022, the Peruvian Ministry of Culture declared the traditional use of San Pedro cactus in northern Peru as cultural heritage. Although people of Western culture have tended to use psychedelics for either psychotherapeutic or recreational reasons, most indigenous cultures, particularly in South America, have seemingly tended to use psychedelics for more supernatural reasons such as divination. This can often be related to "healing" or health as well but typically in the context of finding out what is wrong with the individual, such as using psychedelic states to "identify" a disease and/or its cause, locate lost objects, and identify a victim or even perpetrator of sorcery. In some cultures and regions, even psychedelics themselves, such as ayahuasca and the psychedelic lichen of eastern Ecuador (Dictyonema huaorani) that supposedly contains both 5-MeO-DMT and psilocybin, have also been used by witches and sorcerers to conduct their malicious magic, similarly to nightshade deliriants like brugmansia and latua.
Ventral developmental patterning and the expression of transcription factors is influenced by the gradients of BMP2 and sonic hedgehog protein (SHH). These factors are essential for coordinating early patterns of cell proliferation. Six weeks into gestation, the corticotroph cells can be identified. By seven weeks of gestation, the anterior pituitary is capable of secreting ACTH. Within eight weeks of gestation, somatotroph cells begin to develop with cytoplasmic expression of human growth hormone. Once a fetus reaches 12 weeks of development, the thyrotrophs begin expression of Beta subunits for TSH, while gonadotrophs being to express beta-subunits for LH and FSH. Male fetuses predominately produced LH-expressing gonadotrophs, while female fetuses produce an equal expression of LH and FSH expressing gonadotrophs. At 24 weeks of gestation, prolactin-expressing lactotrophs begin to emerge.
Sources: en.wikipedia.org
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.
No. The peptide is synthetic, although it is modelled on a fragment of a naturally occurring hormone. ACTH(4-10) is generated when ACTH is cleaved, but the Pro-Gly-Pro extension is not a known endogenous sequence. It is therefore a designed analogue rather than a natural metabolite.
The label reflects reported effects on attention, memory and recovery after neurological injury in regional clinical reports. Those reports are mostly small and have not been widely replicated outside the region. The classification is descriptive and does not imply a single defined mechanism.
一般不建议常温长期保存。多数说明指向 -20 °C 冷冻避光。常温运输通常被视为短期可接受，但会加快降解风险。