The short version of heptapeptide fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-03-15 and is reviewed periodically as new material appears.
Terminology around the compound varies by source. It appears in catalogues and papers as Semax, as the heptapeptide ACTH(4-7)-Pro-Gly-Pro, and under various alphanumeric laboratory codes used by individual suppliers. These names refer to the same sequence but may imply different salt forms, purity grades, or counter-ions. Peptide databases usually list the free base mass, while product descriptions sometimes report acetate or trifluoroacetate salts with a different formula weight. Because naming conventions for research peptides are not standardised across vendors, checking the declared sequence and measured mass is more reliable than relying on a trade name alone.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. Its design combines the ACTH(4-7) core fragment with a C-terminal Pro-Gly-Pro extension, a modification intended to improve stability and prolong activity. The molecule is hydrophilic, carries no lipid chains or glycosylation, and has a theoretical mass just over 810 daltons in its free form. All seven residues are proteinogenic amino acids, so no non-natural building blocks appear in the backbone. A free N-terminal methionine and C-terminal proline define the unmodified parent peptide.
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.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide | ACTH(4-7) analogue |
| Sequence | Met-Glu-His-Phe-Pro-Gly-Pro | Free N terminus, unmodified side chains |
| Molecular weight | 813.9 Da | Free base; salt forms differ |
| Appearance | White to off-white powder | Lyophilised solid |
| Solubility | Freely soluble in water | Hydrophilic; polar solvents preferred |
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。
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
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.
A carcinoid (also carcinoid tumor) is a slow-growing type of neuroendocrine tumor originating in the cells of the neuroendocrine system. In some cases, metastasis may occur. Carcinoid tumors of the midgut (jejunum, ileum, appendix, and cecum) are associated with carcinoid syndrome. Sometimes, carcinoids cause paraneoplastic syndromes, which involve discharge of serotonin and other vasoactive substances from well-differentiated carcinoids. A neuroendocrine paraneoplastic syndrome involves neoplastic secretion of functional peptides, hormones, cytokines, growth factors, and/or immune cross-reactivity between tumor tissues and normal host tissues, resulting in a syndrome of clinical signs and symptoms. Carcinoid tumors are the most common malignant tumor of the appendix, but they are most commonly associated with the small intestine, and they can also be found in the rectum and stomach. They are known to grow in the liver, but this finding is usually a manifestation of metastatic disease from a primary carcinoid occurring elsewhere in the body. They have a very slow growth rate compared to most malignant tumors. The median age at diagnosis for all patients with neuroendocrine tumors is 63 years.
== Contraindications == Suvorexant is contraindicated in people with narcolepsy as it may worsen their symptoms. This is its only absolute contraindication. Suvorexant has not been studied in people with severe hepatic impairment and is not recommended in these individuals due to the likelihood of increased suvorexant exposure. On the other hand, suvorexant may be used in people with mild-to-moderate hepatic impairment as well as renal impairment of any severity and no dose adjustment is necessary in these situations. Concomitant use of suvorexant with strong CYP3A4 inhibitors is not recommended due to potential for increased suvorexant exposure while concomitant use of suvorexant with strong CYP3A4 inducers may result in loss of suvorexant exposure and effectiveness. Suvorexant should be used carefully in people with a history of drug misuse or alcoholism due to its drug-liking effects and possible misuse potential at doses higher than those approved for therapeutic use. Similarly, suvorexant should be used carefully in people with a history of depression or suicidality as it may rarely increase suicidal ideation. The medication is indicated for use in adults and the elderly but has not been studied in children and adolescents and hence is not recommended for these individuals. Suvorexant has shown teratogenic effects in animals such as decreased body weight at doses much higher than the equivalents of those approved for therapeutic use in humans.
== Sport and recreation == The town has a number of parks, including The Carrs Park. Wilmslow held its first Scarecrow Festival in July 2010 with 85 local businesses taking part and 93 different scarecrows. The week-long festival is organised by the Rotary Club of Wilmslow Dean and the members of the Wilmslow Business Group. The Wilmslow Festive 10k, organised by Run North West, takes place at the end of November each year. The run starts in Wilmslow town centre, with 2,479 finishers in 2017. The Wilmslow Half Marathon is an annual half marathon road running race, established in 1984, and usually run in March.
Keratocytes may play a role in different corneal disorders. According to comparative research, their functions drastically diverge from the norm in keratoconus, the most frequent form of corneal dystrophy. In keratoconic corneas they have been shown to commit apoptosis far away from any epithelial injury; a hypothesis exists that presents excessive keratocyte apoptosis as a major pathological event in keratoconus. According to one study, patient's keratocytes have decreased levels of one of the alcohol dehydrogenase subforms, they secrete significantly less superoxide dismutase 3, according to another.
Sources: en.wikipedia.org
=== Legal status === Ertugliflozin, ertugliflozin combined with metformin, and ertugliflozin combined with sitagliptin were approved for medical use in the United States in December 2019, and in the European Union in March 2018.
=== Surface modification === The surface modification of nanocellulose is currently receiving a large amount of attention. Nanocellulose displays a high concentration of hydroxyl groups at the surface which can be reacted. However, hydrogen bonding strongly affects the reactivity of the surface hydroxyl groups. In addition, impurities at the surface of nanocellulose such as glucosidic and lignin fragments need to be removed before surface modification to obtain acceptable reproducibility between different batches.
== In various fields == As a central goal of many individual and societal endeavors, well-being is relevant to many fields of inquiry. Grouped under the umbrella term science of well-being, some disciplines investigate the nature and components of well-being directly, while others study its causes, effects, or correlates in specific domains of life. A central motivation of academic inquiry is the belief that well-being can be improved through appropriate measures. Some of these measures focus on individual lifestyle changes. Others take the form of societal interventions to alter how economic, medical, educational, workplace, and political institutions function.
Triiodothyronine, also known as T3, is a thyroid hormone. It affects almost every physiological process in the body, including growth and development, metabolism, body temperature, and heart rate. Production of T3 and its prohormone thyroxine (T4) is activated by thyroid-stimulating hormone (TSH), which is released from the anterior pituitary gland. This pathway is part of a closed-loop feedback process: Elevated concentrations of T3, and T4 in the blood plasma inhibit the production of TSH in the anterior pituitary gland. As concentrations of these hormones decrease, the anterior pituitary gland increases production of TSH, and by these processes, a feedback control system stabilizes the level of thyroid hormones in the bloodstream. At the cellular level, T3 is the body's more active and potent thyroid hormone. T3 helps deliver oxygen and energy to all of the body's cells, its effects on target tissues being roughly four times more potent than those of T4. Of the thyroid hormone that is produced, just about 20% is T3, whereas 80% is produced as T4. Roughly 85% of the circulating T3 is later formed in the liver and anterior pituitary by removal of the iodine atom from the carbon atom number five of the outer ring of T4. In any case, the concentration of T3 in the human blood plasma is about one-fortieth that of T4. The half-life of T3 is about 2.5 days. The half-life of T4 is about 6.5 days. T3 levels start to rise 45 minutes after administration and peak at about 2.5 hours.
This similarity suggests that the two enzymes originally arose due to gene duplication, and evolved over time to fill unique roles in the coagulation cascade. Clotting enzymes isolated from Limulus polyphemus and Tachypleus tridentatus exhibit similar properties, indicating high conservation of this enzyme throughout evolutionary divergence.
Sources: en.wikipedia.org
=== SVSPA === The Swami Vivekananda State Police Academy (SVSPA) is the state level police training institution catering to the training needs of West Bengal Police and Kolkata Police. The Academy conducts basic training for DSP Probationers, Cadet Sub-Inspectors of both Armed & Un-Armed branches and Recruit Constables for West Bengal Police and also for Warders and Inspectors of Correctional Services, Sub-Inspectors and Sergeants of Kolkata Police. The Academy also conducts Pre-promotional training for Constables, Asst. SI's and SI's for their promotion to the next rank besides conducting various short in- service training courses on different professional issues. SVSPA is well equipped with in-house faculty members both for academic indoor training and outdoor training. Besides, a number of eminent faculty members from different disciplines take classes for the training programs. These include academicians, experts from Forensic Science Medicine, scientific officers/experts from Forensic Science Laboratory (FSL) & Central Forensic Science Laboratory (CFSL), lawyers, judicial officers and senior police officers.
=== Calcium ion channels === Calcium channels are important for certain cell-signaling cascades as well as neurotransmitter release at axon terminals. A variety of different types of calcium ion channels are found in excitable cells. As with sodium ion channels, calcium ion channels have been isolated and cloned by chromatographic purification techniques. It is notable, as with the case of neurotransmitter release, that calcium channels can interact with intracellular proteins and plays a strong role in signaling, especially in locations such as the sarcoplasmic reticulum of muscle cells.
Another glycogen storage disease that affects muscle (muscle GSD); Metabolic myopathy other than glycogen storage disease; Endocrine myopathy that affects carbohydrate metabolism secondary to the primary disease; Inadequate blood flow (ischemia), particularly of the calves Intermittent claudication; Popliteal artery entrapment syndrome; Chronic venous insufficiency. Poor diet or malabsorption disease resulting in malnutrition of micronutrients essential for muscle glycogen metabolism; Other rare myopathies, such as Brody disease, Rippling muscle disease, Erythrocyte lactate transporter defect, a small number of muscular dystrophies, Tubular aggregate myopathy (TAM), etc. Exercise-induced muscle fatigue without cramping:
Polish refugees were housed at dedicated settlements set up at Marandellas and Rusape, two towns about 40 km (25 mi) apart to the south-east of Salisbury, from 1943. There were similar camps in Kenya, Nyasaland, Tanganyika, Northern Rhodesia and South Africa. The Polish settlements in Southern Rhodesia were run jointly by local authorities and the Polish consulate in Salisbury; the Polish government-in-exile in London provided funding. Transport back to Europe picked up sharply as the war came to a close, and by October 1945 less than 2,000 Polish refugees remained. Colonial officials were reluctant to let the Poles stay indefinitely, asserting that they were not culturally British enough and might have communist connections or sympathies, but most of those who remained showed little inclination to leave. Southern Rhodesia ultimately allowed around 726 Polish refugees to settle permanently after the war.
=== Mental tools === FM can cause negative mental effects. German guidance encourages FM patients to focus on coping with symptoms (instead of fighting the syndrome), on aspects of life which are important to them, on ceasing perfectionism, and on establishing and respecting their limits. In a 2020 Cochrane review, cognitive behavioral therapy (CBT) was found to have a small but beneficial effect for reducing pain and distress, but adverse events were not well evaluated. CBT and related psychological and behavioral therapies have a small to moderate effect in reducing symptoms of fibromyalgia. Effect sizes tend to be small when psychological therapies are used as treatment for patients with fibromyalgia, and are comparable to the effect sizes seen with other drug and pain treatments. Multicomponent treatment appears to have greater efficacy than any individual treatment. Several reviews have found that CBT has no significant effect in pain reduction, although it does improve sleep quality. There is also limited evidence that acceptance and commitment therapy improves outcomes such as health-related quality of life and pain acceptance. Patient education is recommended by the European League Against Rheumatism (EULAR) as an important treatment component. As of 2022, there is only low-quality evidence showing that patient education can decrease pain and fibromyalgia impact. Sleep hygiene interventions show low effectiveness in improving insomnia in people with chronic pain.
Sources: en.wikipedia.org
It is a synthetic seven-amino-acid peptide built from the ACTH(4-7) sequence plus a Pro-Gly-Pro tail. It belongs to the family of short ACTH fragments studied for nervous-system effects. Its backbone contains only standard amino acids.
It contains the 4-7 fragment of adrenocorticotropic hormone extended at the C terminus. That truncation removes the region associated with steroidogenic activity. The design intent was to keep neurotrophic properties while avoiding full hormonal effects.
No natural source of the intact heptapeptide is known. It is produced by solid-phase peptide synthesis. Some related ACTH fragments arise as hormone processing products, but the Pro-Gly-Pro extension is a designed addition rather than a natural sequence.
Registered medical products are most often 0.1% nasal drops. Research suppliers ship lyophilized powder, usually in milligram quantities, which is dissolved before use. The active peptide is the same in both cases; presentation and excipients differ.