The short version of Melanocortin receptor fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-02-01 and is reviewed periodically as new material appears.
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 compound was developed during the 1980s at the Institute of Molecular Genetics in Moscow as part of research on fragments of adrenocorticotropic hormone. Early work examined short ACTH-derived sequences that retained neurotrophic effects while lacking the endocrine activity of the full hormone. Semax entered clinical use in Russia during the 1990s, where it received registration for several neurological indications. Outside that region it remained primarily a laboratory research material rather than an approved therapeutic. English-language literature on it grew more slowly and frequently cited the original Russian studies.
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.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
| 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 |
Published research on this peptide originates mainly from Russian laboratories, and the wider international literature is comparatively thin. Studies have used rodent models of stroke, hypoxia, and memory tasks, with a smaller number of human trials reported. Reported outcomes include changes in attention and memory measures, along with effects on neurotrophic factor expression in some experiments. Small sample sizes, inconsistent dosing protocols, and limited independent replication are widely noted limitations, so the strength of the clinical evidence remains an open question.
Semax is a synthetic heptapeptide whose sequence is Met-Glu-His-Phe-Pro-Gly-Pro. The first four residues correspond to the ACTH(4-10) fragment, while the terminal Pro-Gly-Pro extension was added to improve metabolic stability. Its molecular formula is C37H51N9O10S and its monoisotopic mass is approximately 813.9 Da. The compound is classified as a peptide research chemical and as a registered pharmaceutical product in Russia, but it does not hold marketing approval in the European Union or the United States. Naming conventions vary across supplier catalogs.
Development of the compound took place in the Soviet Union during the 1980s, largely through peptide research groups affiliated with the Shemyakin-Ovchinnikov Institute and Moscow State University. Investigators screened fragments of adrenocorticotropic hormone for activity on the central nervous system while attempting to separate cognitive effects from hormonal ones. The shortened sequence was selected because it retained behavioral activity in animal models without stimulating corticosteroid release. Early publications described the molecule as an ACTH(4-10) analog.
纯度评估以反相高效液相色谱为主，通过主峰面积百分比给出粗略结果，再配合电喷雾质谱核对分子量。氨基酸分析可验证组成比例，手性色谱或毛细管电泳用于检查残基构型。常见杂质包括缺失序列的短肽、氧化产物与二聚体。由于多数市售品不附带完整检验报告，独立第三方检测常被用来核实标称值。
从分子层面看，Semax 是线性七肽，没有二硫键、糖基或脂链修饰，N 端为游离氨基，C 端为游离羧基。分子含组氨酸与谷氨酸侧链，因此在水和甲醇等极性溶剂中溶解良好，在非极性溶剂中溶解有限。计算分子量约为 814 Da，与其质子化离子的质荷比吻合，可用于质谱确认。
Tryptophan, arginine, cysteine and charged amino acids, like aspartic and glutamic acid, are poorly removed. ERAP1's trimming efficiency can also be influenced by the internal sequence of the peptide, with preferences for hydrophobic and positively charged residues.
Human Growth Hormone Fragment 176–191 (hGH frag 176–191) is a peptide fragment of human growth hormone. It has erroneously been presented as a lipolytic peptide fragment based on extrapolations of clinical data pertaining to AOD9604, a modified form of hGH frag 176–191. In contrast to AOD9604, hGH frag 176–191 has not been studied in humans.
12 September 1946 the minister for external affairs in India, Jawaharlal Nehru demanded in a letter to the Commander in Chief and Defence Secretary, that a large-scale reform should be implemented to improve the Indian Army. Calcutta had been ravaged by large communal riots, but the British Indian Army was able to restore order. Nehru demanded with urgency, that the Indian Army should safeguard India's new democracy. Nehru was a nationalist and opposed India's "divide and rule" policy.
=== Naproxen and Cromolyn === Naproxen is a non-steroidal anti-inflammatory drug while cromolyn is an anti-allergic agent which acts as a mast cell stabilizer. Both drugs have demonstrated the anticancer effect in addition to hypoglycemic effect due to inhibition of glycogen synthase kinase-3β (GSK-3β). To validate the anti-GSK-3β hypothesis of naproxen and cromolyn, docking of the two structures against GSK-3β binding pocket and comparing their fitting with known GSK-3β inhibitor ARA014418 was performed, in addition to measuring the serum glucose, serum insulin, serum C-peptide, weight variation and hepatic glycogen levels for normal and diabetic fasting animal's models to assess their in vitro hypoglycemic effects. Naproxen and cromolyn were successfully docked into the binding site of GSK-3β (both were fitted into its binding pocket). They exhibited electrostatic, hydrophobic, and hydrogen-bonding interactions with key amino acids within the binding pocket with binding interaction profiles similar to AR-A014418 (the known inhibitor). The negative charges of the carboxylic acid groups in both drugs interact electrostatically with the positively charged guanidine group of Arg141. Moreover, the hydrogen bonding interactions between carboxylic acid moieties of cromolyn and the ammonium groups of Lys183 and Lys60, in addition to π-stacking of the naphthalene ring system of naproxen with the phenolic ring of Tyr134.
Sources: en.wikipedia.org
A standardised set of terminology is used in anatomy to describe relative and absolute location and movement of anatomical parts. The standard anatomical position is the orientation that anatomical terms of location and motion are typically used in reference to. In humans, this refers to the body in a standing position with arms at the side and palms facing forward. Other positions referenced in medicine include prone (lying facing down) and supine (lying facing up).
According to the Endocrine Society, there is "growing evidence suggesting that obesity is a disorder of the energy homeostasis system, rather than simply arising from the passive accumulation of excess weight" and that "obesity pathogenesis involves two related but distinct processes: (1) sustained positive energy balance (energy [caloric] intake > energy expenditure) and (2) resetting of the body weight "set point" at an increased value." In other words, the fundamental cause of obesity is consuming more calories than are used by the body, and the body adapting to a heavier weight as the standard for the individual.
Prince August Wilhelm married his cousin Princess Alexandra Victoria of Schleswig-Holstein-Sonderburg-Glücksburg on 22 October 1908 at the Berliner Stadtschloss. The couple had planned to take up residence in Schönhausen Palace in Berlin, but changed their mind when his father, Kaiser Wilhelm, decided to leave his son the Villa Liegnitz in the Sanssouci Park. In 1912 their only child, Prince Alexander Ferdinand of Prussia, was born. Their Potsdam residence developed into a meeting place for artists and scholars. In the First World War, August Wilhelm was made district administrator (Landrat) of the district of Ruppin; his office and residence was now Schloss Rheinsberg. His personal adjutant Hans Georg von Mackensen played an important role in his life; the two had been close friends since August Wilhelm's youth. These "pronounced homophilic tendencies" contributed to the failure of his marriage to Princess Alexandra Victoria. The couple did not divorce while August Wilhelm's father, Kaiser Wilhelm II, was Emperor, owing to his opposition to the idea.
Glutathione S-transferase kappa 1 (GSTK1) is an enzyme that in humans is encoded by the GSTK1 gene which is located on chromosome seven. It belongs to the superfamily of enzymes known as glutathione S-transferase (GST), which are mainly known for cellular detoxification. The GSTK1 gene consists of eight exons and seven introns and although it is a member of the GST family, its structure has been found to be similar to bacterial HCCA (2-hydroxychromene-2-carboxylate) isomerases and bacterial disulphide-bond-forming DsbA oxidoreductase. This similarity has later allowed the enzyme GSTK1 to be renamed to DsbA-L. Research has also suggested that several variations of the GSTK1 gene can be responsible for metabolic diseases and certain types of cancer.
The Pentagon was extensively damaged, causing one section of the building's E ring to collapse. The plane hit the Pentagon at the first-floor level. The front part of the fuselage disintegrated on impact; debris from the tail section penetrated the furthest into the building, breaking through 310 feet (94 m) of the three outermost of the building's five rings.
Sources: en.wikipedia.org
=== Profitability === The fine chemical industry has undergone several boom and bust phases during its almost 30 years of existence. The biggest boom took place in the late 1990s, when high-dosage, high volume anti-AIDS drugs and COX-2 inhibitors gave a big boost to custom manufacturing. After the end of the "irrational exuberance" in 2000, the industry suffered a first bust in 2003, as a result of capacity expansions, the advent of Asian competitors and a ruinous M&A activity, and several billion dollars of shareholder value were lost. A minor boom was associated with stockpiling of GlaxoSmithKline's Relenza (zanamivir) and Roche's Tamiflu (oseltamivir phosphate) by many countries in order to prepare for a possible avian flu epidemic. Surprisingly, the main cause for the 2009 slump was not the general recession, but slow-downs of growth and inventory adjustments by the pharma industry. They resulted in postponements or cancellations of orders. The unfavorable development was in sharp contrast to the very optimistic growth forecasts, which many fine chemical companies had announced. These were based on equally promising sector reports from investment banks which, in turn, had evolved from forward projections of the preceding boom period. In most cases, these projections were missed by a large margin. Following these slumps, almost half of the industry achieved a return on sales (ROS) of more than 10%, and less than 10% received an ROS below 5%. In the worst years, 2003 and 2009, almost half of the companies suffered from an ROS of less than 5%.
==== Methadone clinics ==== In the United States, prescription of methadone requires intensive monitoring and must be obtained in-person from an Opioid Treatment Program—colloquially known as a 'methadone clinic'—when prescribed for opioid use disorder (OUD). According to federal laws, methadone cannot be prescribed by a doctor and obtained from a pharmacy to treat addiction. Because of its long half-life, methadone is almost invariably prescribed to be taken in a single daily dose. At nearly all methadone clinics in the US, patients must visit a clinic to receive and take their dose under the supervision of a nurse. Patients earn take home bottles with their daily dose, by providing clean drug tests and doing therapy. These bottles will be taken away if they provide a dirty drug test, or break clinic rules. They can be earned back. Both patients who are new to methadone treatment and high-risk patients—such as those who are using drugs and alcohol, including cannabis in some states—must visit the clinic daily.
=== Discovery and development === The patent for Vicoprofen was filed in December 1984, and US patent number 4,587,252 was granted in May 1986. Although ibuprofen and hydrocodone were already available on the market at this time, the fact that they had never been supplied together in a single formulation required approval from the FDA as if it were a new drug. Knoll filed an investigational new drug application on 30 December 1986. A new drug application was later filed by Knoll on 25 April 1996, and received final approval from the FDA on 23 September 1997. Vicoprofen tablets were initially formulated and packaged by Knoll, with ibuprofen supplied by Albemarle Corporation and hydrocodone supplied by Mallinckrodt Pharmaceuticals. The validity of Knoll's patent on Vicoprofen has been challenged in federal court. In September 2002, the US District Court for the Northern District of Illinois granted a motion of invalidity filed by Teva Pharmaceuticals against Knoll's patent on Vicoprofen, ruling the patent was invalid as obvious. This ruling paved the way for Teva's abbreviated new drug application to be approved by the FDA which would allow them to manufacture and market their own generic. Knoll appealed the decision. In April 2003, Teva announced that its abbreviated new drug application had been approved by the FDA, and its generic would begin shipping immediately.
An anorectic is a drug that reduces appetite, resulting in lower food consumption, leading to weight loss. These substances work by affecting the central nervous system or certain neurotransmitters to create a feeling of fullness or reduce the desire to eat. The understanding of anorexiant effects is crucial in the development of interventions for weight management, eating disorders, and related health concerns. The anorexiant effect can be induced through diverse mechanisms, ranging from hormonal regulation to neural signaling. Ghrelin, leptin, and peptide YY are among the hormones involved in appetite control. Additionally, neurotransmitters such as serotonin and dopamine in the central nervous system contribute significantly to the regulation of food intake. By contrast, an appetite stimulant is referred to as orexigenic. The term is (from the Greek ἀν- an- 'without' and ὄρεξις órexis 'appetite'), and such drugs are also known as anorexigenic, anorexiant, or appetite suppressant.
In some eukaryotes, such as the parasitic worm Ascaris suum, an enzyme similar to complex II, fumarate reductase (menaquinol:fumarate oxidoreductase, or QFR), operates in reverse to oxidize ubiquinol and reduce fumarate. This allows the worm to survive in the anaerobic environment of the large intestine, carrying out anaerobic oxidative phosphorylation with fumarate as the electron acceptor. Another unconventional function of complex II is seen in the malaria parasite Plasmodium falciparum. Here, the reversed action of complex II as an oxidase is important in regenerating ubiquinol, which the parasite uses in an unusual form of pyrimidine biosynthesis.
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.
It is associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.