The short version of melanocortin signalling fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-10-25 and is reviewed periodically as new material appears.
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 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.
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。
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。
| 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 studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
Later generations of the molecule include an N-acetylated form and an amidated form, both marketed online alongside the parent peptide. These variants differ in terminal chemistry and stability, and they are frequently discussed in the same breath even though they have not been compared in controlled trials. Supply outside formal healthcare systems comes largely from laboratories that synthesize peptides to order. Purity and identity of these materials vary widely, and no single body oversees the international trade.
Semax is a synthetic heptapeptide developed in the Soviet Union during the 1980s by researchers at the Institute of Molecular Genetics in Moscow. It was designed as a truncated analog of adrenocorticotropic hormone, retaining only the fragment spanning residues four through ten. Investigators sought a peptide that would preserve the cognitive effects associated with ACTH while eliminating the hormonal stimulation of the adrenal cortex. The compound entered clinical use in Russia during the following decade.
Russian regulatory authorities approved the peptide for nasal administration, and it remains listed in the national pharmacopoeia under several trade names. Documented indications include acute ischemic stroke, transient ischemic attacks, traumatic brain injury, and certain ophthalmological and neurological conditions. Physicians also prescribe it for cognitive complaints in older patients, although the evidence base for that use is thinner. Outside Russia and a few neighboring states, the substance is not an approved medicine and is sold instead as a research chemical.
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.
Clinical reports describe use in ischaemic stroke, transient ischaemic attack, optic nerve conditions, and cognitive complaints, but most of these studies are small and were conducted in a single region. Systematic reviews have generally described the evidence base as limited in size and variable in methodological quality. Randomised controlled data suitable for international regulatory assessment are scarce. As a result, major treatment guidelines outside Russia do not include the peptide, and interest in it remains largely research-driven rather than routine clinical.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It is described in the literature as an analogue of the ACTH(4–10) fragment, a short N-terminal portion of adrenocorticotropic hormone that retains some neurotropic activity without the full hormonal effects of the parent peptide. The molecule carries a methionine residue at the N-terminus and two proline residues near the C-terminus, features that shape both its interactions with receptor systems and its chemical stability. The free peptide corresponds to the formula C37H51N9O10S and a molecular mass near 813.9 Da.
=== Christian: The Angry Couch Potato === First aired 5 April 2009 Mayhem helps out Cameron and Brian, by dropping Conor "Hurricane" Heun in the cage with Christian, a lazy, couch potato with a thirst for the pain of others.
Driver, who is incarcerated at Salinas Valley State Prison (CDCR #D-35391), has filed numerous pro se civil rights actions under 42 U.S.C. § 1983 at multiple California facilities. While his lawsuits have consistently been dismissed on procedural grounds, he has appealed some decisions to the U.S. Court of Appeals for the Ninth Circuit. In May and June 2022, Adilah Patton, a 28‑year‑old pretrial detainee in Indianapolis, was forcibly injected twice with Invega Sustenna while in custody at the Marion County Adult Detention Center. A federal lawsuit filed on her behalf alleges that the injections were administered without a medical assessment, a prescription, or the consent of her court‑appointed guardian. The lawsuit describes the injections as assault, battery, excessive force, and violations of the Fourteenth Amendment right to informed consent. In September 2024, Haitian immigrant Cassandra Fameux filed a criminal complaint alleging that her husband, Michigan anesthesiologist Dr. Paul Gregory St. Claire, and psychiatrist Dr. Dominic Barberio forcibly injected her monthly from 2017 to 2021 with unprescribed Invega Sustenna—sometimes at doses up to 256 mg—as "punishment" when her husband was angry. Divorce court testimony and a recorded conversation indicate Barberio admitted she was not schizophrenic; two psychiatrists found she had PTSD, not bipolar disorder or schizophrenia. A subsequent police investigation led to a recommendation that her husband be charged with domestic assault.
=== Academia === Prior to his postdoctoral fellowship, Kopeček served as the research scientific officer for the Institute of Macromolecular Chemistry at the Czechoslovak Academy of Sciences from 1965 to 1967. He then served in the same capacity after his postdoctoral fellowship at the National Research Council of Canada until 1972, when he became the head of the Laboratory of Medical Polymers at the Institute of Macromolecular Chemistry from 1972 to 1980. Kopeček then became head of the Laboratory of Biodegradable Polymers until 1988. In 1986, Kopeček became co-director for the Center of Controlled Chemical Delivery of Utah and was a visiting professor. From 1989, he was professor of bioengineering and professor of pharmaceutics and pharmaceutical chemistry. As of 2002, Kopeček has been a distinguished professor in both pharmaceutical chemistry and biomedical engineering. In 2017, he became the director for the Center of Controlled Chemical Delivery at the University of Utah.
Sources: en.wikipedia.org
The treaty stipulated that East Germany would unify its territory with Federal Republic of Germany via Article 23 of the Basic Law, meaning that East Germany and the Volkskammer would cease to exist. The chamber's last legislative period therefore only lasted four and a half months. The treaty took effect on 3 October 1990; on the same day, 144 of the 400 Volkskammer deputies became members of the Bundestag (63 from the CDU, 33 from the SPD, 24 from the PDS, 9 from the BFD, 8 from the DSU, and 7 from Alliance 90 and the Green Party). The 8 DSU members joined the CDU/CSU Bundestag Group, briefly renamed CDU/CSU/DSU. The distribution of seats between these parties was determined by recalculating the results of the 1990 elections on a per-state basis. Their tenure came to an end two months later with the first all-German federal election on 2 December 1990.
== Metabolism and sources == Ergothioneine has been found in bacteria, plants, and animals, sometimes at high (millimolar) levels relative to the environment. Foods found to contain ergothioneine include liver, kidney, black beans, kidney bean, and oat bran, with the highest levels in bolete and oyster mushrooms, especially in Pleurotus citrinopileatus. Levels can be variable, even within species and some tissues can contain much more than others. In the human body, the largest amounts of ergothioneine are found in erythrocytes, eye lens, semen, and skin. Although many species contain ergothioneine, only a few make it; the others absorb it from their diet or, in the case of plants, from their environment. Biosynthesis has been detected in Actinomycetota, such as Mycobacterium smegmatis and certain fungi, such as Neurospora crassa (red bread mold) and Schizosaccharomyces pombe (fission yeast). Lactobacillus reuteri was reported to produce ergothioneine but later was clarified to merely accumulate rather than produce it. Other species of bacteria, such as Bacillus subtilis, Escherichia coli, Proteus vulgaris, and Streptococcus, as well as fungi in the Saccharomycotina cannot make ergothioneine.
On May 2, 2025, reports surfaced that the match ball would be called the "Adidas Trionda". The design features red, green, and blue (the three colors representing Canada, Mexico, and the United States, respectively, and also featured on the host countries' flags), as well as a white wave connecting each of the colors, hence the name using the Spanish words for three (tri) and wave (onda). The design also features the national symbols of the three host countries (a maple leaf for Canada, a golden eagle for Mexico, and a five-pointed star for the United States) as well as gold embellishments to represent the World Cup Trophy. Later it was officially announced by Adidas on October 2, 2025.
* UAG is normally the amber stop codon, but in organisms containing the biological machinery encoded by the pylTSBCD cluster of genes the amino acid pyrrolysine will be incorporated. ** UGA is normally the opal (or umber) stop codon, but encodes selenocysteine if a SECIS element is present. † The stop codon is not an amino acid, but is included for completeness. †† UAG and UGA do not always act as stop codons (see above). ‡ An essential amino acid cannot be synthesized in humans and must, therefore, be supplied in the diet. Conditionally essential amino acids are not normally required in the diet, but must be supplied exogenously to specific populations that do not synthesize it in adequate amounts. & Occurrence of amino acids is based on 135 Archaea, 3775 Bacteria, 614 Eukaryota proteomes and human proteome (21 006 proteins) respectively.
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.
不存在。它是依据 ACTH 的一段序列人工设计的分子，天然蛋白质中找不到与之完全相同的七肽。名称属于研究代号，而非天然物质名。