ACTH(4-10) raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
Reviewed 2025-11-17. Anything still debated is marked as such rather than presented as settled.
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.
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 |
|---|---|---|
| Primary research models | Rodent studies | Largest share of published data |
| Reported markers | BDNF and NGF expression | Measured mainly in animal tissue |
| Common administration | Intranasal | Matches the registered formulation |
| Blood residence time | Minutes | Rapid enzymatic degradation |
| Evidence quality | Small trials, limited replication | Noted repeatedly in reviews |
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.
Solid material is normally kept at minus 20 degrees Celsius in a sealed, desiccated container. Reconstituted solutions are less stable and are usually divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of activity. Light exposure is minimized by using amber glassware or foil wrapping. Published stability data for this peptide are sparse, so recommended storage conditions rest mainly on general practice for short synthetic peptides rather than on dedicated study.
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.
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.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
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.
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.
Japanese scientists from the Japan Aerospace Exploration Agency (JAXA) have discovered a huge cave on the moon with their Kaguya lunar probe, which could offer astronauts protection from dangerous radiation during future lunar landings, especially during the planned stopover of a Mars mission. As part of a human mission to Mars, astronauts must be protected from cosmic radiation. During Curiosity's mission to Mars, a Radiation Assessment Detector (RAD) was used to measure radiation exposure. The radiation exposure of 1.8 millisieverts per day was mainly due to the constant presence of high-energy galactic particle radiation. In contrast, radiation from the sun accounted for only about three to five percent of the radiation levels measured during Curiosity's flight to Mars. On the way to Mars, the RAD instrument detected a total of five major radiation events caused by solar flares. To protect the astronauts, a plasma bubble will surround the spacecraft as an energy shield and its magnetic field will protect the crew from cosmic radiation. This would eliminate the need for conventional radiation shields, which are several centimeters thick and correspondingly heavy. In the Space Radiation Superconducting Shield (SR2S) project, which was completed in December 2015, magnesium diboride was found to be a suitable material for generating a suitable force field.
== History == While working on her dissertation, Evelyn M. Anderson co-discovered ACTH with James Bertram Collip and David Landsborough Thomson and, in a paper published in 1933, explained its function in the body. An active synthetic form of ACTH, consisting of the first 23 amino acids of native ACTH, was first made by Klaus Hofmann at the University of Pittsburgh.
=== Indication differences === Agents specifically labeled for cardiac arrhythmia Esmolol, sotalol, landiolol (Japan) Agents specifically labeled for congestive heart failure Bisoprolol, carvedilol, sustained-release metoprolol Agents specifically labeled for glaucoma Betaxolol, carteolol, levobunolol, timolol, metipranolol Agents specifically labeled for myocardial infarction Atenolol, metoprolol (immediate release), propranolol (immediate release), timolol, carvedilol (after left ventricular dysfunction), bisoprolol (preventive treatment before and primary treatment after heart attacks) Agents specifically labeled for migraine prophylaxis Timolol, propranolol Propranolol is the only agent indicated for the control of tremor, portal hypertension, and esophageal variceal bleeding, and used in conjunction with α-blocker therapy in phaeochromocytoma.
== Pathophysiology == There are three types of dendritic cells, plasmacytic dendritic cells (pDC) and two types of conventional dendritic cells (cDC), myeloid cDC1 and myeloid cDC2. pDC circulate in the blood, representing <0.4% of all nucleated blood cells, and are present in various hematological tissues such as lymph nodes and spleen. Their major function is to detect and then initiate immune responses to intracellular pathogens, particularly viruses such as the cold sore-causing Herpes simplex viruses, HIV, and hepatitis viruses but also bacteria such as the tuberculosis-causing Mycobacterium tuberculosis, fungi such as the aspergillosis-causing Aspergillus fumigatus and parasites such as malaria-causing Plasmodium falciparum. Following detection of these intracellular pathogens, pCD initiate immune responses by producing massive amounts of type I and type III interferons as well as by differentiating (i.e. maturing) into conventional dendritic cells that further promote immune responses by, e.g. functioning as antigen-presenting cells. The malignant pDC in BPDCN have the appearance of immature plasmacytoid dendritic cells. They are distinguished from other dendritic, myeloid, lymphoid and NK cell types by exhibiting at least several of the following properties: 1) plasmacytoid morphology; 2) production of large amounts of type I interferons when properly stimulated; 3) ability to differentiate into conventional dendritic cells when properly stimulated; 4) the expression of key marker proteins such as granzyme B, TCF4, interleukin-3 receptor (i.e.
Dehydrated eggs advertisements appeared in the late 1890s in the United States. Powdered eggs appear in literature as a staple of camp cooking at least as early as 1912. Powdered eggs, known also as dried eggs, were widely used in the United Kingdom during World War II when food (including both fresh and dried eggs) was rationed. While nutritious, they were not a culinary treat; Esther Rantzen, reminiscing about the time, wrote that there were few real eggs, and "I can still remember the disgusting taste of powdered egg". It was also part of military rations. Bob Hope joked during a USO show, "Fellows, the folks at home are having a terrible time about eggs. They can't get any powdered eggs at all. They've got to use the old-fashioned kind you break open".
Sources: en.wikipedia.org
In ambient ionization, the formation of ions occurs outside the mass spectrometer without sample preparation. Electrospray is used for ion formation in a number of ambient ion sources. Desorption electrospray ionization (DESI) is an ambient ionization technique in which a solvent electrospray is directed at a sample. The electrospray is attracted to the surface by applying a voltage to the sample. Sample compounds are extracted into the solvent which is again aerosolized as highly charged droplets that evaporate to form highly charged ions. After ionization, the ions enter the atmospheric pressure interface of the mass spectrometer. DESI allows for ambient ionization of samples at atmospheric pressure, with little sample preparation.
The products stored in qullqas varied from region to region in the Inca Empire depending upon production in the local area. At Wanuku Pampa in north central Peru, a major Inca administrative and storage area, 50 to 80 percent of the qullqas were used to store dried potatoes and other root crops. Only 5 to 7 percent of qullqas were devoted to the storage of maize, probably because the high altitudes and cool climate limited the local production of maize. Root crops were layered with straw and baled for storage. Maize was shelled and stored in large jars. Additional agriculture products stored in qullqas consisted of quinoa, beans, other vegetables, dried meat (Ch'arki or jerky), and seeds. Non-agricultural goods stored included textiles and clothing, wool, cotton, and feathers (used in clothing), tools and weapons and gold and silver vessels and other luxury items. Inventories of items stored were kept on quipus, the knotted strings the Incas used in lieu of a written language. The scope of the Inca's commitment for storage is described by Pedro Sánchez de la Hoz, the first Spanish chronicler to visit the Inca capital of Cuzco, who said that in the city «[there are] storehouses full of blankets, wool, weapons, metals and clothes and of everything that is grown and made in this realm ... and there is a house in which are kept more than 100,000 dried birds, for from their feathers articles of clothing are made. ...
DNA expression requires the transfection of suitable host cells. Typically, either bacterial, yeast, insect, or mammalian cells (such as human embryonic kidney cells or Chinese hamster ovary cells) are used as host cells. Following transplantation into the host organism, the foreign DNA contained within the recombinant DNA construct may or may not be expressed. That is, the DNA may simply be replicated without expression, or it may be transcribed and translated and a recombinant protein is produced. Generally speaking, expression of a foreign gene requires restructuring the gene to include sequences that are required for producing an mRNA molecule that can be used by the host's translational apparatus (e.g. promoter, translational initiation signal, and transcriptional terminator). Specific changes to the host organism may be made to improve expression of the ectopic gene. In addition, changes may be needed to the coding sequences as well, to optimize translation, make the protein soluble, direct the recombinant protein to the proper cellular or extracellular location, and stabilize the protein from degradation.
Einstein died on April 18, 1955, months prior to the institution's dedication and opening. Although affiliation with Mount Sinai Hospital in Manhattan was considered, a site in the Bronx's Morris Park was selected due to ample land and proximity to the adjacent Bronx Municipal Hospital then under construction. Construction of the first medical school building—now the Leo Forchheimer Medical Sciences Building—began in October 1953, with a contemporary design of steel and concrete. On September 12, 1955, Einstein welcomed its first class of 56 students in the partially completed Forchheimer Building. Einstein was the first new medical school to open in New York City since 1897 and the first in the United States to open under Jewish auspices.
The primary purpose of a tablet counter (also known as a pill counter or drug counter) is to accurately count prescription medications in tablet or capsule form to aid the requirement for patient medication safety, to increase efficiency and reduce costs for the typical pharmacy. Newer versions of this counting device include advanced software to continue to improve safety for the patient who is receiving the prescription, ensuring that the pharmacy staff dispense the right medication at correct dosage strength for the right patient. (see also medication safety). Today's pharmacy industry recognizes the need for heightened vigilance against medication errors across the entire spectrum. A wealth of research has been conducted regarding the prevalence of medication errors and the ability of technology to decrease or eliminate such errors. (See the March 2003 landmark study by Auburn University's Center for Pharmacy Operations and Designs). Prescription dispensing safety and accuracy in the pharmacy are an essential part of ensuring the right patient gets the right medication at the right dosage. A trend in pharmacy is to place a greater reliance on technology and pharmacy automation to minimize the chance of human error and speed up the process of dispensing. Pharmacy management generally sees technology as a solution to industry challenges like staffing shortages, prescription volume increases, long and hectic work hours and complicated insurance reimbursement procedures.
Sources: en.wikipedia.org
=== Initiation === Initiation involves the small subunit of the ribosome binding to the 5' end of mRNA with the help of initiation factors. The ribosome and its associated factors assemble and bind to an mRNA. The first TRNA is attached at the start codon. This process is defined as either cap-dependent, in which the ribosome binds initially at the 5' cap and then travels to the stop codon, or as cap-independent, where the ribosome does not initially bind the 5' cap. The 5' cap is added when the nascent pre-mRNA is about 20 nucleotides long.
==== Physical symptoms ==== Lightheadedness Tearing of the eyes Mydriasis (dilated pupils) Photophobia (sensitivity to light) Hyperventilation (breathing that is too fast/deep) Runny nose Yawning Sneezing Nausea, vomiting, and diarrhea Fever Sweating Chills Tremors Akathisia (restlessness) Tachycardia (fast heartbeat) Aches and pains, often in the joints or legs Elevated pain sensitivity Blood pressure that is too high (hypertension, may cause a stroke)
Severe side effects are rare and occur mostly in those with poor immune function. Its use in people with HIV/AIDS should be done with care. It is not recommended during pregnancy; however, the few times it has been given during pregnancy no problems resulted. The vaccine is available either by itself or along with the MMR vaccine, in a version known as the MMRV vaccine. It is made from weakened virus. A live attenuated varicella vaccine, the Oka strain, was developed by Michiaki Takahashi and his colleagues in Japan in the early 1970s. American vaccinologist Maurice Hilleman's team developed a chickenpox vaccine in the United States in 1981, based on the "Oka strain" of the varicella virus. The chickenpox vaccine first became commercially available in 1984. It was first licensed for use in the US by Merck, under the brand name Varivax, in 1995. It is on the World Health Organization's List of Essential Medicines.
BioShock received highly positive reviews from critics, with an average review score of 96/100 for Xbox 360 and Microsoft Windows, and 94/100 for PlayStation 3 on reviews aggregator Metacritic. Mainstream press reviews praised the immersive qualities of the game and its political dimension. The Boston Globe described it as "a beautiful, brutal, and disquieting computer game ... one of the best in years", and compared the game to Whittaker Chambers' 1957 riposte to Atlas Shrugged, "Big Sister Is Watching You". Wired also mentioned the Ayn Rand connection (a partial anagram of Andrew Ryan) in a report on the game which featured a brief interview with Levine. The Chicago Sun-Times review said "I never once thought anyone would be able to create an engaging and entertaining video game around the fiction and philosophy of Ayn Rand, but that is essentially what 2K Games has done ... the rare, mature video game that succeeds in making you think while you play". The Los Angeles Times review concluded: "Sure, it's fun to play, looks spectacular and is easy to control.
The first organ ever induced and made in the lab was the bladder, which was created in 1999. By 2014, there had been various tissues regenerated by the 3D printer and these tissues included: muscle, vagina, penis and the thymus. In 2014, a conceptual human lung was first bioengineered in the lab. In 2015, the lab robustly tested its technique and regenerated a pig lung. The pig lung was then successfully transplanted into a pig without the use of immunosuppressive drugs. In 2015, researchers developed a proof of principle biolimb inside a laboratory; they also estimated that it would be at least a decade for any testing of limbs in humans. The limb demonstrated fully functioning skin, muscles, blood vessels and bones. In April 2019, researchers 3D printed a human heart. The prototype heart was made by human stem cells but only to the size of a rabbit's heart. In 2019, the researchers hoped to one day place a scaled up version of the heart inside humans.
Sources: en.wikipedia.org
The main proposal is modulation of neurotrophic factors such as brain-derived neurotrophic factor, supported largely by animal experiments. Receptor-level targets have not been firmly established. Most reviews describe the mechanism as only partially characterized.
The compound is registered as a medicine in Russia, so clinical work has concentrated there. Trials elsewhere are few and generally small. This geographic concentration is a recognized limitation in evidence reviews.
Some fraction may reach the central nervous system through olfactory pathways, and this is often cited as the rationale for the nasal route. The size of that fraction in humans is not well quantified. Blood concentrations after nasal dosing are low, which complicates measurement.
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.