ACTH(4-10) raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-12-12. Anything still debated is marked as such rather than presented as settled.
Identity and purity are commonly assessed by reversed-phase high-performance liquid chromatography, with ultraviolet detection near 214 nanometers for the peptide backbone. Mass spectrometry, either electrospray or matrix-assisted laser desorption, confirms molecular mass and detects truncation or modification products. Amino acid analysis can verify composition. Because the sequence contains no strongly absorbing aromatic residue apart from phenylalanine, detection wavelengths are chosen carefully. Purity values above 95 percent are typical for research-grade material.
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.
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.
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.
| 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.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
The international community refused to accept the validity of any agreement which did not incorporate the main nationalist parties. The British government (then led by the recently elected Margaret Thatcher) issued invitations to all parties to attend a peace conference at Lancaster House. These negotiations took place in London in late 1979. The three-month-long conference almost failed to reach conclusion, due to disagreements on land reform, but resulted in the Lancaster House Agreement. UDI ended, and Rhodesia temporarily reverted to the status of a British colony (the 'Colony of Southern Rhodesia'). As per the agreement, Lord Soames became governor with full legislative and executive powers. The Lancaster House Agreement further provided for a ceasefire which was followed by an internationally supervised general election, held in February 1980. ZANU led by Robert Mugabe won this election, some alleged, by terrorising its political opposition, including supporters of ZAPU, through former insurgents that had not confined themselves to the designated guerrilla assembly points, as stipulated by the Lancaster House Agreement. The observers and Soames were accused of looking the other way, and Mugabe's victory was certified. Nevertheless, few could doubt that Mugabe's support within his majority Shona tribal group was extremely strong. The Rhodesian military seriously considered mounting a coup against a perceived stolen election ("Operation Quartz") to prevent ZANU from taking over the country.
Thyroid Stimulating Hormone (TSH) (University of Washington Medical Center). September 2011. Method: Access 2 (Beckman Coulter). Thyroid Stimulating Hormone (TSH) (Collaborative Laboratory Services). September 2011. Method: Access 2 (Beckman Coulter). Thyroid Stimulating Hormone (TSH). September 2009. Method: Access 2 (Beckman Coulter). Lab 18 Thyroid Stimulating Hormone. 2001-2002. Method: Microparticle Enzyme Immunoassay. Lab 18 TSH - Thyroid Stimulating Hormone. 1999-2000. Method: Microparticle Enzyme Immunoassay.
=== Benzofurans === Benzofurans are similar in structure to MD(M)A but differ in that the methylenedioxy groups have been modified, removing one of the two oxygens in the methylenedioxy ring to render a benzofuran ring.
== History == The first recombinant plant-derived protein (PDP) was human serum albumin, initially produced in 1990 in transgenic tobacco and potato plants. Open field growing trials of these crops began in the United States in 1992 and have taken place every year since. While the United States Department of Agriculture has approved planting of pharma crops in every state, most testing has taken place in Hawaii, Nebraska, Iowa, and Wisconsin. In the early 2000s, the pharming industry was robust. Proof of concept has been established for the production of many therapeutic proteins, including antibodies, blood products, cytokines, growth factors, hormones, recombinant enzymes and human and veterinary vaccines. By 2003 several PDP products for the treatment of human diseases were under development by nearly 200 biotech companies, including recombinant gastric lipase for the treatment of cystic fibrosis, and antibodies for the prevention of dental caries and the treatment of non-Hodgkin's lymphoma. However, in late 2002, just as ProdiGene was ramping up production of trypsin for commercial launch it was discovered that volunteer plants (left over from the prior harvest) of one of their GM corn products were harvested with the conventional soybean crop later planted in that field. ProdiGene was fined $250,000 and ordered by the USDA to pay over $3 million in cleanup costs. This raised a furor and set the pharming field back, dramatically. Many companies went bankrupt as companies faced difficulties getting permits for field trials and investors fled.
Nalin Chandra Wickramasinghe (born 20 January 1939) is a Sri Lankan-born British mathematician and astronomer. His research interests include the interstellar medium, infrared astronomy, light scattering theory, applications of solid-state physics to astronomy, the early Solar System, comets, astrochemistry, the origin of life and astrobiology. A student and collaborator of Fred Hoyle, the pair worked jointly for over 40 years as the most famous proponents of a non-mainstream version of panspermia, the proposal that life was seeded (or continues to be seeded) on Earth through space-based processes. In 1974 they proposed that some dust in interstellar space matched the spectral characteristics of freeze-dried bacteria, which was largely ignored at its publishing while the ubiquity of polycyclic aromatic hydrocarbons explains the apparent match. Wickramasinghe has advanced numerous fringe claims, including the argument that various outbreaks of illnesses on Earth are of extraterrestrial origins, including the 1918 flu pandemic and certain outbreaks of polio and mad cow disease. For the 1918 flu pandemic they proposed that cometary dust brought the virus to Earth simultaneously at multiple locations—a view dismissed by experts on this pandemic. Claims connecting terrestrial disease and extraterrestrial pathogens have been rejected by the scientific community. Wickramasinghe has written more than 40 books about astrophysics and related topics; he has made appearances on radio, television and film, and he writes online blogs and articles.
Sources: en.wikipedia.org
Furthermore, it can be triggered by severe acute illness, dehydration, extensive exercise, surgery, low-carbohydrate diets, or excessive alcohol intake. Proposed mechanisms for SGLT2-I induced "euglycemic DKA" include increased ketosis due to volume depletion combined with relative insulin deficiency and glucagon excess. SGLT2 inhibitors should be stopped before surgery and only recommenced when it is safe to do so. SGLT2 inhibitors may be used in people with type 1 diabetes, but the possibility of ketoacidosis requires specific risk management. Specifically, they should not be used if someone is also using a low carbohydrate or ketogenic diet.
Formal tea parties, practiced in a similar way as in British tea culture, was a popular social event for the American upper classes in the 19th century, especially among women. It included fancy tea sets, along with finger foods and sweets. Formal tea parties were traditionally hosted by women as a way to socialize and display their hospitality and refinement.
In early September 2024, Little Caesars announced that it would be exiting Singapore, with the last day of operations for the chain being September 30. The last store was in Funan, after the gradual closure of the chain's six other branches throughout the island. In 2022, Little Caesars had plans to expand into France, Germany, and Portugal. In July 2025, Little Caesars expanded to the United Arab Emirates, opening its first branch in Al Barsha, Dubai In May 2026, Little Caesars expanded to Malaysia, opening its first branch in Damansara Utama.
Notch proteins are a family of type 1 transmembrane proteins that form a core component of the Notch signaling pathway, which is highly conserved in animals. The Notch extracellular domain mediates interactions with DSL family ligands, allowing it to participate in juxtacrine signaling. The Notch intracellular domain acts as a transcriptional activator when in complex with CSL family transcription factors. Members of this type 1 transmembrane protein family share several core structures, including an extracellular domain consisting of multiple epidermal growth factor (EGF)-like repeats and an intracellular domain transcriptional activation domain (TAD). Notch family members operate in a variety of different tissues and play a role in a variety of developmental processes by controlling cell fate decisions. Much of what is known about Notch function comes from studies done in Caenorhabditis elegans (C. elegans) and Drosophila melanogaster. Human homologs have also been identified, but details of Notch function and interactions with its ligands are not well known in this context.
=== LGBTQ rights === In June 2019, Pritzker signed an executive order requiring schools across the state to be "affirming and inclusive" of transgender and non-binary students. He also asked the State Board of Education to take a lead on LGBTQ rights by making relevant resources easily accessible.
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.
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.