ACTH(4-10) comes up often in conversation and rarely with the context attached. Here we lay out the basics in order, then work through the practical considerations.
Last reviewed on 2026-04-12. Where a claim depends on a specific study, the study is described rather than over-claimed.
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.
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.
研究兴趣主要集中在神经营养因子相关的路径上，包括脑源性神经营养因子与神经生长因子的表达变化。部分实验报告称在特定条件下观察到这些因子的水平上升，但具体信号通路和剂量依赖关系仍未完全厘清。多数公开数据来自细胞模型和动物实验，人体对照研究数量有限。因此，该化合物的作用机制在文献中属于活跃讨论，而非已经确立的定论。
Semax 是一种人工合成的七肽，氨基酸序列为 Met-Glu-His-Phe-Pro-Gly-Pro，单字母缩写记作 MEHFPGP。它被归类为促肾上腺皮质激素片段 ACTH(4-10) 的结构类似物，但并不天然存在于生物体内。母体片段 ACTH(4-10) 的序列为 Met-Glu-His-Phe-Arg-Trp-Gly，Semax 替换了中间两个残基，并在羧基端延长了 Pro-Gly-Pro 三肽。这种延长被普遍认为能提升分子对肽酶的耐受性。
| 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 |
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
Solid semax is typically supplied as a lyophilised powder that is hygroscopic and sensitive to moisture, light, and repeated temperature cycling. Long-term storage of the dry peptide is generally recommended at approximately -20 degrees Celsius, while shorter working periods may use refrigeration at 2 to 8 degrees Celsius. Vials should remain tightly closed and desiccated when brought to room temperature, because condensation can damage the material before it is weighed. Dividing a batch into aliquots is preferable to thawing one container repeatedly.
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.
The C-terminal Pro-Gly-Pro extension is not incidental. Proline-rich tails are known to resist several common peptidases, and the published literature attributes the longer half-life of Semax, relative to unmodified ACTH fragments, to this feature. The modification also removes the melanocyte-stimulating and corticosteroidogenic activity that characterizes longer ACTH-derived sequences. Because the molecule is small and hydrophilic, it is typically formulated as an aqueous solution for intranasal or parenteral delivery. Acetylation or amidation at the termini appears in closely related research peptides and shifts the mass by a fixed increment.
Practical handling follows from those properties. Bulk material is best divided into single-use portions soon after receipt, because each thaw exposes the whole container to moisture and temperature cycling. Vials should be allowed to reach room temperature before opening to prevent condensation on the powder. Low-binding plasticware reduces loss of dilute solutions, and sterile filtration is used when a preparation must remain free of microbial growth. Records of batch number, reconstitution date and storage history are what allow a later analytical result to be interpreted meaningfully.
Identity and purity of Semax are established mainly by reversed-phase high-performance liquid chromatography coupled with mass spectrometry. The chromatographic trace gives a purity estimate as a percentage of total peak area, while electrospray or matrix-assisted laser desorption ionization confirms the molecular mass against the calculated value. Amino acid analysis and sequence-specific fragmentation provide further confirmation when a supplier's chain of custody is unclear. Vendors frequently quote a purity figure without stating the detection wavelength or the integration method, which limits how far one number can be compared with another.
Stability depends heavily on physical state. Lyophilized powder held dry, cold and dark retains its content over long periods, whereas dissolved peptide begins to change within days at room temperature. The most cited degradation route is oxidation of the methionine residue, which converts the peptide to a sulfoxide form that elutes differently on chromatography. Hydrolysis of amide bonds and adsorption onto container walls contribute smaller losses. Buffers that exclude oxygen from the headspace slow the oxidation pathway, but no single condition prevents all change indefinitely.
=== Immune system === Inflammation has been suggested to have a role in the pathogenesis of fibromyalgia. People with fibromyalgia tend to have higher levels of inflammatory cytokines IL-6, and IL-8. There are also increased levels of the pro-inflammatory cytokines IL-1 receptor antagonist. Increased levels of pro-inflammatory cytokines may increase sensitivity to pain, and contribute to mood problems. Anti-inflammatory interleukins such as IL-10 have also been associated with fibromyalgia. Neurogenic inflammation has been proposed as a contributing factor to fibromyalgia. A repeated observation shows that autoimmunity triggers, such as traumas and infections, are among the most frequent events preceding the onset of fibromyalgia. A 2024 discussion concluded that the complexity of FM may mean both autoimmune and non-autoimmune mechanisms occur in FM, possibly in different subgroups of FM.
=== Spatial Localization Sequences === In PRESS, the two chief drawbacks are lengthy echo time (TE) and chemical shift displacement (CSD) artifacts. Lengthy echo time arises from the fact that PRESS uses two 180° pulses, unlike STEAM which uses exclusively 90° pulses. The duration of 180° pulses are generally longer than 90° pulses because it takes more energy to flip a net magnetization vector completely as opposed to only 90°. Chemical shift displacement artifacts arises partly because of less optimal slice selection profiles. Multiple 180° pulses does not allow a very short TE, resulting in less optimal slice selection profile. Additionally, multiple 180° pulses means smaller bandwidth and thus larger chemical shift displacement. Specifically, the chemical shift displacement artifacts occur because signals with different chemical shifts experience different frequency-encoded slice selections and thus do not originate from same volume. Additionally, this effect becomes greater at higher magnetic field strengths. SPECIAL consists of a spatially selective pre-excitation inversion pulse (typically AFP) followed by spatially selective excitation and refocusing pulses, both of which are usually SLR or truncated sinc pulses. SPECIAL is a hybrid of PRESS and Image-Selected In Vivo Spectroscopy (ISIS). ISIS achieves spatial localization in the three spatial dimensions through a series of eight slice-selective preinversion pulses that can be appropriately positioned so that the sum of the eight cycles removes all signal outside the desired 3D region.
The relationships between India in the days of the British Raj and the United States were thick. Swami Vivekananda promoted Yoga and Vedanta in the United States at the World's Parliament of Religions in Chicago, during the World's Fair in 1893. Mark Twain visited India in 1896 and described it in his travelogue Following the Equator with both revulsion and attraction before concluding that India was the only foreign land he dreamed about or longed to see again. Regarding India, Americans learned more from English writer Rudyard Kipling. Mahatma Gandhi had an important influence on the philosophy of non-violence promoted by American civil rights movement leader Martin Luther King Jr. in the 1950s. Former American Military Officer and later a prominent figure in the spiritual and philosophical movement of Theosophy Henry Steel Olcott, left New York in December 1878 to relocate the headquarters of the Theosophical Society to India. He and the society arrived in Bombay on February 16, 1879. Olcott's objective was to immerse himself in the culture of India, the birthplace of his spiritual inspiration, the Buddha. The Society's headquarters were established at Adyar, Chennai, where Olcott also founded the Adyar Library and Research Centre. He aimed to obtain authentic translations of sacred texts from Buddhist, Hindu, and Zoroastrian religions to provide Westerners with a true understanding of Eastern philosophies, countering Westernized interpretations. Throughout his time in India, Olcott worked tirelessly to bridge the cultural and spiritual gap between East and West.
The soft tissue envelope in congenital contractual conditions such as clasped or arthrogrypotic thumbs is often deficient in two planes, the thumb-index web and the flexor aspect of the thumb. There is often an appearance of increased skin at the base of the index finger that is part of the deformity. This tissue can be used to resurface the thumb-index web after a comprehensive release of all the tight structures to allow for a larger range of motion of the thumb. This technique is called the index rotation flap. The flap is taken from the radial side of the index finger. It is proximally based at the distal edge of the thumb-index web. The flap is made as wide as possible, but still small enough to close with the excessive skin on the palmar side of the index finger. The flap is rotated around the tightest part of the thumb to the metacarpophalangeal joint of the thumb, allowing for a larger range of motion.
These ultrafine particles are small enough to bypass respiratory defenses and be inhaled deep into the lungs, where they can enter the bloodstream and are associated with severe systemic inflammation, cardiovascular disease, and premature death. Many e-cigarette companies market their products as a smoking cessation aid without evidence of effectiveness. E-cigarette marketing has been found to make unsubstantiated health statements (e.g., that they help one quit smoking) including statements about improving psychiatric symptoms, which may be particularly appealing to smokers with mental illness. E-cigarette marketing advocate weight control and emphasize use of nicotine with many flavors. These marketing angles could particularly entice overweight people, young people, and vulnerable groups. Some e-cigarette companies state that their products are green without supporting evidence which may be purely to increase their sales.
Sources: en.wikipedia.org
=== Shikimate pathway === In plants, the shikimate pathway first leads to the formation of chorismate, which is the precursor of phenylalanine, tyrosine, and tryptophan. These aromatic amino acids are the precursors of many secondary metabolites, all essential to a plant's biological functions, such as the hormones salicylate and auxin. This pathway contains enzymes that can be regulated by inhibitors, which can cease the production of chorismate, and ultimately the organism's biological functions. Herbicides and antibiotics work by inhibiting these enzymes involved in the biosynthesis of aromatic amino acids, thereby rendering them toxic to plants. Glyphosate, a type of herbicide, is used to control the accumulation of excess greens. In addition to destroying greens, Glyphosate can easily affect the maintenance of the gut microbiota in host organisms by specifically inhibiting the 5-enolpyruvylshikimate-3-phosphate synthase which prevents the biosynthesis of essential aromatic amino acids. Inhibition of this enzyme results in disorders such as gastrointestinal diseases and metabolic diseases.
== Education == Kowalska received a master's degree in chemistry in 1968 and a PhD in physical chemistry in 1972, both from Higher Pedagogical School in Katowice, which became University of Silesia in Katowice. She conducted post-doctoral research at University of Salford in the UK, under the supervision of Hans Suschitzky. She received a habilitation degree in 1988 from Maria Curie-Skłodowska University, with the habilitation dissertation titled A New Thermodynamic Model of the Chromatographic Process and its Applications.
Canada is divided into 15 terrestrial and five marine ecozones. These ecozones encompass over 80,000 classified species of Canadian wildlife, with an equal number yet to be formally recognized or discovered. Although Canada has a low percentage of endemic species compared to other countries, due to human activities, invasive species, and environmental issues in the country, there are currently more than 800 species at risk of being lost. About 65 percent of Canada's resident species are considered "Secure". Over half of Canada's landscape is intact and relatively free of human development. The boreal forest of Canada is considered to be the largest intact forest on Earth, with approximately 3,000,000 square kilometres (1,200,000 sq mi) undisturbed by roads, cities or industry. Since the end of the last glacial period, Canada has consisted of eight distinct forest regions. Approximately 12.1 percent of the nation's landmass and freshwater are conservation areas, including 11.4 percent designated as protected areas. Approximately 13.8 percent of its territorial waters are conserved, including 8.9 percent designated as protected areas. Canada's first National Park, Banff National Park was established in 1885. Canada's oldest provincial park, Algonquin Provincial Park was established in 1893. Established in 2015, Lake Superior National Marine Conservation Area is the world's largest freshwater protected area. Canada's largest national wildlife region, established in 2018, is the Scott Islands Marine National Wildlife Area.
Ellen Jane Langer (; born March 25, 1947) is an American psychologist and professor of psychology at Harvard University. In 1981, she became the first woman to be tenured in psychology at Harvard. She has been called the "mother of mindfulness" and the "mother of positive psychology". Langer studies the illusion of control, decision-making, aging, and mindfulness theory. Her most influential work is Counterclockwise, published in 2009, the first test of her mind/body unity theory. Her most recent book, The Mindful Body: Thinking Our Way to Chronic Health, published in 2023, argues for the enormous control we have over our health based on mind/body unity.
==== Capping ==== Capping of the pre-mRNA involves the addition of 7-methylguanosine (m7G) to the 5' end. To achieve this, the terminal 5' phosphate requires removal, which is done with the aid of enzyme RNA triphosphatase. The enzyme guanosyl transferase then catalyses the reaction, which produces the diphosphate 5' end. The diphosphate 5' end then attacks the alpha phosphorus atom of a GTP molecule in order to add the guanine residue in a 5'5' triphosphate link. The enzyme (guanine-N7-)-methyltransferase ("cap MTase") transfers a methyl group from S-adenosyl methionine to the guanine ring. This type of cap, with just the (m7G) in position is called a cap 0 structure. The ribose of the adjacent nucleotide may also be methylated to give a cap 1. Methylation of nucleotides downstream of the RNA molecule produce cap 2, cap 3 structures and so on. In these cases the methyl groups are added to the 2' OH groups of the ribose sugar. The cap protects the 5' end of the primary RNA transcript from attack by ribonucleases that have specificity to the 3'5' phosphodiester bonds. . Note that in plants and some other eukaryotes, Nicotinamide adenine dinucleotide has also been identified as a cap in plants, human, and yeast, with scientists proposing this may be a mechanism to regulate gene expression via metabolites.
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.
不是。Semax 是完全人工合成的七肽，自然界中没有对应的已知肽段。它的设计灵感来自促肾上腺皮质激素片段 ACTH(4-10)，但序列经过了替换和延长。