This is a working overview of ACTH(4-10), written for readers who want more than a one-paragraph summary but less than a textbook.
Reviewed 2025-11-17. Anything still debated is marked as such rather than presented as settled.
Quality documentation for research-grade peptide usually includes a certificate of analysis stating purity, identity, and residual counterion content. Batch-to-batch variation in purity and salt form is a recognized issue, and comparisons across suppliers require attention to the exact counterion, for example acetate versus trifluoroacetate. Sequence verification by tandem mass spectrometry provides stronger evidence than a single mass measurement. For any study reporting biological results, the analytical method and the measured purity should be stated explicitly. Independent verification of supplier claims is considered good practice.
Semax is supplied as a lyophilized powder that appears white to off-white. It dissolves readily in water, phosphate-buffered saline, and other aqueous media, which simplifies preparation of working solutions for laboratory use. The nasal products registered in Russia are dilute aqueous solutions, typically around 0.1 percent peptide by weight. Organic solvents are rarely necessary and can complicate handling. Because the peptide is hygroscopic, weighing should be performed quickly and with minimal exposure to ambient humidity.
Reported pharmacological work centers on neurotrophic signaling, including changes in BDNF and NGF expression in hippocampal tissue in animal models. Human data come largely from studies conducted in Russia, and how well those results generalize to other populations remains an open question. Regulatory status differs sharply by jurisdiction: Semax is a registered prescription medicine in Russia, while it holds no approved marketing status in the United States or the European Union. Outside such jurisdictions it is generally handled as a research chemical, which affects both documentation and quality expectations.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. It was developed as a fragment analog of adrenocorticotropic hormone, modeled specifically on the ACTH(4-10) region. The first four residues reproduce that fragment, while a Pro-Gly-Pro tripeptide is appended at the C-terminus. Work on the compound originated in Russia, where it entered clinical use as an intranasal preparation. Its sequence places it among short regulatory peptides studied for effects on the central nervous system rather than on the adrenal axis.
| Property | Value | Notes |
|---|---|---|
| Typical purity | ≥95% by HPLC | Research-grade material |
| Detection wavelength | 214 nm | Peptide bond absorbance |
| Reconstitution medium | Sterile water or saline | Prepare fresh or aliquot immediately |
| Storage (solution) | -80 °C, single-use aliquots | Avoid repeated freeze-thaw cycles |
| Common salt form | Acetate or trifluoroacetate | Affects mass and solubility |
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.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
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.
The parent fragment ACTH(4-10) carries the sequence Met-Glu-His-Phe-Arg-Trp-Gly. Semax replaces the arginine and tryptophan positions with a proline-glycine-proline tail, giving Met-Glu-His-Phe-Pro-Gly-Pro. That change removes residues associated with adrenal stimulation, so the peptide does not drive cortisol release the way full ACTH does. This distinction shapes how the compound is grouped in the literature, where it sits with neuropeptides and peptide neuromodulators rather than with corticosteroids.
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.
Verification of a supplied batch generally combines a certificate of analysis with independent testing, because certificates are self-reported documents. A typical package includes a chromatographic trace, a mass spectrum, and a stated water or counter-ion content. Batch-to-batch consistency matters more than a single purity figure when results are compared across experiments. No single mandatory standard governs research-grade peptide release, so laboratories are expected to define their own acceptance criteria. Residual trifluoroacetate from purification is a frequently overlooked counter-ion.
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.
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.
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.
National authorities could be justified in refusing to reimburse patients for medical services abroad if the health care received at home was without undue delay, and it followed "international medical science" on which treatments counted as normal and necessary. The Court requires that the individual circumstances of a patient justify waiting lists, and this is also true in the context of the UK's National Health Service. Aside from public services, another sensitive field of services are those classified as illegal. Josemans v Burgemeester van Maastricht held that the Netherlands' regulation of cannabis consumption, including the prohibitions by some municipalities on tourists (but not Dutch nationals) going to coffee shops, fell outside article 56 altogether. The Court of Justice reasoned that narcotic drugs were controlled in all member states, and so this differed from other cases where prostitution or other quasi-legal activity was subject to restriction. If an activity does fall within article 56, a restriction can be justified under article 52, or by overriding requirements developed by the Court of Justice. In Alpine Investments BV v Minister van Financiën a business that sold commodities futures (with Merrill Lynch and another banking firms) attempted to challenge a Dutch law that prohibiting cold calling customers. The Court of Justice held the Dutch prohibition pursued a legitimate aim to prevent "undesirable developments in securities trading" including protecting the consumer from aggressive sales tactics, thus maintaining confidence in the Dutch markets.
=== Familial adenomatous polyposis === Familial adenomatous polyposis (FAP) is a familial cancer syndrome caused by mutations in the APC gene. In FAP, adenomatous polyps are present in the colon. The polyps progress into colon cancer unless removed. The APC gene is a tumor suppressor. Its protein product is involved in many cellular processes. Inactivation of the APC gene leads to the buildup of a protein called β-catenin. This protein activates two transcription factors: T-cell factor (TCF) and lymphoid enhancer factor (LEF). These factors cause the upregulation of many genes involved in cell proliferation, differentiation, migration and apoptosis (programmed cell death), causing the growth of benign tumors.
== Research trends == PPy is a potential vehicle for drug delivery. The polymer matrix serves as a container for proteins. Polypyrrole has been investigated as a catalyst support for fuel cells and to sensitize cathode electrocatalysts. Together with other conjugated polymers such as polyaniline, poly(ethylenedioxythiophene) etc., polypyrrole has been studied as a material for "artificial muscles", a technology that offers advantages relative to traditional motor actuating elements. Polypyrrole was used to coat silica and reverse phase silica to yield a material capable of anion exchange and exhibiting hydrophobic interactions. Polypyrrole was used in the microwave fabrication of multiwalled carbon nanotubes, a rapid method to grow CNT's. A water-resistant polyurethane sponge coated with a thin layer of polypyrrole absorbs 20 times its weight in oil and is reusable. The wet-spun polypyrrole fibre can be prepared chemical polymerization pyrrole and DEHS as dopant. Polypyrrole is often used as a coating material to accelerate synthetic mimics of cosmic dust into impact ionisation mass spectrometers, which are used on space missions to analyse the composition of their parent bodies.
Hikmat al-Hijri issued a statement demanding an urgent call for international protection, reiterating the leadership's rejection of any security force entering their areas, the General Security Service and another unidentified agency, accusing them of crossing into the province under the pretext of providing protection while bombing border villages and supporting extremist groups with heavy weaponry and drones. Shelling was reported in the neighboring Daraa Governorate, in which four civilians were wounded by a Druze group from the town of Al-Thaalah and among the villages controlled by Druze groups. Israeli aircraft were seen conducting low-altitude flights over the western countryside of Suwayda, deploying flares, the Israeli Army later announced that it had struck multiple tanks belonging to the Syrian Army in Suwayda Governorate. However a tank was repaired and was deployed again in an hour, The Syrian Arab News Agency reported a total of three Israeli strikes. On 15 July, the Syrian Minister of Defense announced that a ceasefire had been reached with Druze spiritual leadership in Suwayda to cooperate with the Interior and Defense Forces and to surrender their weapons, though it was denied by Hikmat al-Hijri who declared that he would "resist this brutal campaign by all available means", including women, children, and elderly fighting, accusing government forces of violating the ceasefire by shelling Suwayda. Israel conducted further strikes in al-Mazraa after the Syrian Armed Forces took control of the town. Strikes were also reported on the outskirts of Suwayda.
== History == Robert Guthrie is given much of the credit for pioneering the earliest screening for phenylketonuria in the late 1960s using a bacterial inhibition assay (BIA) to measure phenylalanine levels in blood samples obtained by pricking a newborn baby's heel on the second day of life on filter paper. Congenital hypothyroidism was the second disease widely added in the 1970s. Guthrie and colleagues also developed bacterial inhibition assays for the detection of maple syrup urine disease and classic galactosemia. The development of tandem mass spectrometry (MS/MS) screening in the early 1990s led to a large expansion of potentially detectable congenital metabolic diseases that can be identified by characteristic patterns of amino acids and acylcarnitines. In many regions, Guthrie's BIA has been replaced by MS/MS profiles, however the filter paper he developed is still used worldwide, and has allowed for the screening of millions of infants around the world each year. In the United States, the American College of Medical Genetics recommended a uniform panel of diseases that all infants born in every state should be screened for. They also developed an evidence-based review process for the addition of conditions in the future. The implementation of this panel across the United States meant all babies born would be screened for the same number of conditions. This recommendation is not binding for individual states, and some states may screen for disorders that are not included on this list of recommended disorders.
Sources: en.wikipedia.org
when more than one class of infectives is involved. This method, originally introduced by Diekmann et al. (1990), can be used for models with underlying age structure or spatial structure, among other possibilities. In this picture, the spectral radius of the next-generation matrix
18 October — The Primary Principals Collective Bargaining Union accepts a 2.5% pay rise offer following four months of negotiations with the Ministry of Education. This will be followed by another 2.1% pay rise in 2026. 20 October: The New Zealand Government introduces two new requirements for job seeker beneficiaries who have failed a welfare obligation: engaging in three job search activities weekly and attending at least one employment-training course per month. A measles case linked to international travel is reported in Auckland. 21 October: Strong winds cause power outages, fallen trees and disrupt road and rail travel across the Wairarapa region. Lines company Powerco reports that 10,000 houses in the area have lost electricity due to fallen power lines. Strong winds and heavy rains disrupt road, rail and air travel in the Wellington Region. One person is killed by a fallen tree branch in Mount Victoria during a storm that hits Wellington. Strong winds cause four vegetation fires in the Hawke's Bay Pōrangahau area, leading to the evacuation of vie homes. Strong winds and dry conditions cause six fires in the Kaikōura District, leading to the destruction of 14 buildings and local evacuations. Three new measles cases are reported in Manawatū and Nelson. 22 October: Fire and Emergency New Zealand deploys numerous firefighters and helicopters to combat fires in the Kaikōura District and Pōrangahau. Strong winds and fires cause power outages and flight disruptions through the lower North Island and upper South Island.
=== Flow cell === The eluant from the column passes through one or more flow cells to measure the concentration of protein in the eluant (by UV light absorption at 280 nm). The conductivity cell measures the buffer conductivity, usually in millisiemens/cm, which indicates the concentration of salt in the buffer. A flow cell which measures pH of the buffer is also commonly included. Usually each flow cell is connected to a separate electronics module which provides power and amplifies the signal.
== Glycosyltransferases == Before monosaccharide units are incorporated into glycoproteins, polysaccharides, or lipids in living organisms, they are typically first "activated" by being joined via a glycosidic bond to the phosphate group of a nucleotide such as uridine diphosphate (UDP), guanosine diphosphate (GDP), thymidine diphosphate (TDP), or cytidine monophosphate (CMP). These activated biochemical intermediates are known as sugar nucleotides or sugar donors. Many biosynthetic pathways use mono- or oligosaccharides activated by a diphosphate linkage to lipids, such as dolichol. These activated donors are then substrates for enzymes known as glycosyltransferases, which transfer the sugar unit from the activated donor to an accepting nucleophile (the acceptor substrate).
=== Pharmacokinetics === In terms of metabolism, TMA-2 is known to be at least partially O-demethylated in animals in vivo. It might produce 2,4,5-trihydroxyamphetamine (THA) as a metabolite. The pharmacokinetics and metabolism of TMA-2 in humans are unknown.
Sources: en.wikipedia.org
A bispecific monoclonal antibody (BsMAb, BsAb) is an artificial protein that can simultaneously bind to two different types of antigen or two different epitopes on the same antigen. Naturally occurring antibodies typically only target one antigen. BsAbs can be manufactured in several structural formats. BsAbs can be designed to recruit and activate immune cells, to interfere with receptor signaling and inactivate signaling ligands, and to force association of protein complexes. BsAbs have been explored for cancer immunotherapy, drug delivery, and Alzheimer's disease.
=== Therapeutic foods === Due in part to limited research on supplementary feeding, there is little evidence that this strategy is beneficial. A 2015 systematic review of 32 studies found that there are limited benefits when children under 5 receive supplementary feeding, especially among younger, poorer, and more undernourished children. However, specially formulated foods do appear to be useful in treating moderate acute malnutrition in the developing world. These foods may have additional benefits in humanitarian emergencies, since they can be stored for years, can be eaten directly from the packet, and do not have to be mixed with clean water or refrigerated. In young children with severe acute malnutrition, it is unclear if ready-to-use therapeutic food differs from a normal diet. Severely malnourished individuals can experience refeeding syndrome if fed too quickly. Refeeding syndrome can result regardless of whether food is taken orally, enterally or parenterally. It can present several days after eating with potentially fatal heart failure, dysrhythmias, and confusion. Some manufacturers have fortified everyday foods with micronutrients before selling them to consumers. For example, flour has been fortified with iron, zinc, folic acid, and other B vitamins like thiamine, riboflavin, niacin and vitamin B12. Baladi bread (Egyptian flatbread) is made with fortified wheat flour. Other fortified products include fish sauce in Vietnam and iodized salt.
Authentic extracts elevated to the rank of originals (Series A); Declarations by individuals (Series B); Official reconstructions based on documents held by the administration or registers transferred to it (Series C). This operation lasted until 1897 and ended due to a lack of funds. It made it possible to restore slightly more than 2.6 million records, most of which date from the 19th century. Only 347,000 records were restored for the Ancien Régime, with just five dating back to the 16th century. Altogether, the restored documents represent only one-third of those that were destroyed. Birth records are the most numerous, with approximately 1,422,000 records dating from 1550 to 1859, compared to around 922,000 death records from 1568 to 1859 and 322,000 marriage records from 1630 to 1859. However, the vast majority of data, particularly that concerning families without descendants, is lost forever. The reconstructed records are preserved at the Archives of Paris. Their duplicates, stored at the Montlignon Fort (Val-d’Oise), were destroyed in a fire in June 1974.
The word Pseudomonas means "false unit", from the Greek pseudēs (Greek: ψευδής, false) and (Latin: monas, from Greek: μονάς, a single unit). The stem word mon was used early in the history of microbiology to refer to microorganisms and germs, e.g., kingdom Monera. The species name aeruginosa is a Latin adjective form derived from the noun aerūgō meaning verdigris ("copper rust"), here applied in reference to the blue-green (verdigris-like) colour seen in laboratory cultures of the species. This blue-green pigment is a combination of two secondary metabolites of P. aeruginosa, pyocyanin (blue) and pyoverdine (green), which impart the blue-green characteristic color of cultures.
Sources: en.wikipedia.org
Solid peptide is best kept frozen at about minus 20 degrees Celsius in a sealed container with desiccant. It should be allowed to reach room temperature before opening to prevent condensation. Repeated warming and cooling of the same vial is discouraged.
Reversed-phase liquid chromatography establishes purity, while mass spectrometry confirms molecular mass. The two techniques are normally used together. Retention time alone is not sufficient evidence of identity.
Different counterions change the mass per unit of peptide and can shift chromatographic behavior. Two samples of equal stated purity may therefore not be directly comparable. Reports should specify the counterion whenever quantitative comparisons are made.
The sequence is Met-Glu-His-Phe-Pro-Gly-Pro, a seven-residue peptide. The first four residues correspond to the ACTH(4-10) fragment, and Pro-Gly-Pro is added at the C-terminus. N-acetylated versions also appear in the literature and differ in mass.