If you have been reading about alpha-MSH analogue and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-09-14. Where a claim depends on a specific study, the study is described rather than over-claimed.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence incorporates a lactam bridge that constrains the peptide into a ring, which increases resistance to enzymatic breakdown relative to the natural hormone. Researchers at the University of Arizona synthesised the compound in the late 1980s and early 1990s while studying pigmentation pathways. It has never received marketing approval from any national medicines regulator. In the scientific literature it is usually described as a laboratory research reagent rather than a therapeutic product.
The peptide acts as a non-selective agonist at melanocortin receptors, showing affinity for MC1R, MC3R, MC4R and MC5R. Activation of MC1R on melanocytes drives the conversion of tyrosine into melanin and shifts production toward the darker eumelanin form. MC4R signalling in the central nervous system is linked to appetite and energy balance, which helps explain why reduced food intake appeared in early human studies. Effects on MC4R and on vascular tone also account for the erectile responses recorded as unexpected findings in those same trials.
Receptor-binding studies classify melanotan II as a non-selective melanocortin agonist. It interacts with MC1R, MC3R, MC4R and MC5R, with reported affinities in the low nanomolar range and no strong subtype preference. Activation of MC1R on dermal melanocytes shifts pigment synthesis toward eumelanin, the dark polymer deposited in melanosomes and transferred to keratinocytes. Because the same peptide engages MC4R in the hypothalamus, it also appears in animal work on food intake and erectile response, which is why it is discussed in both pigment and metabolic research. Which receptor populations dominate after systemic exposure in humans is not fully established.
Published pharmacokinetic information is limited and comes mainly from small studies rather than registrational trials. Plasma half-life is usually described as short, on the order of tens of minutes, followed by rapid tissue distribution and clearance of the intact peptide. Metabolites and low concentrations of parent compound have been reported in urine, a detail relevant to anti-doping and forensic testing. Whether repeated exposure changes receptor sensitivity or clearance over time remains an open question. Values differ noticeably between analytical assays, so published numbers should be read as approximate rather than definitive.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Alpha-MSH analogue with a lactam ring |
| Molecular formula | C50H69N15O9 | Commonly cited value for the neutral peptide |
| Molecular weight | 1024.18 g/mol | Calculated for the free molecule |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water, DMSO and ethanol | Dissolution in pure water is often slow |
Human data remain limited and mostly short-term. Reports describe small trials and observational accounts rather than large controlled studies, so questions about dose-response relationships and long-term effects on melanocytes stay open. Whether repeated exposure alters naevus behaviour is not settled in the published record. Researchers also note that self-administered use outside clinical settings makes actual exposure difficult to quantify. Statements about efficacy and safety should therefore be read as preliminary rather than established.
Melanotan II is a synthetic cyclic heptapeptide that acts as an agonist at melanocortin receptors. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, the endogenous peptide involved in pigment production. The analogue carries a lactam bridge that constrains the ring and slows enzymatic breakdown relative to the native hormone. In research literature it appears under several abbreviations, and naming conventions are not fully standardized. Published descriptions usually place it within the broader melanocortin agonist family.
Receptor binding at MC1R on melanocytes raises intracellular cyclic AMP and increases expression of tyrosinase and related enzymes. The downstream result is greater synthesis of eumelanin, the dark pigment, without ultraviolet exposure acting as the trigger. The compound is not selective, however, and also engages MC3R, MC4R and MC5R, which are expressed in the central nervous system and elsewhere. That lack of selectivity is the explanation usually offered for effects reported outside pigmentation, including appetite suppression and nausea. Selectivity remains a central theme in comparative studies of related peptides.
Melanocortin receptors comprise five subtypes with distinct tissue distributions and functions. Melanotan-2 is described in the literature as a non-selective agonist that engages several of these subtypes, including MC1R, MC3R, MC4R, and MC5R. MC1R is the subtype most directly linked to melanin production in skin cells. Because the compound is not subtype-selective, its observed effects in experimental settings are generally attributed to activity across multiple receptor pathways rather than to a single target.
Melanotan-2 is a synthetic linear peptide built from seven amino acids arranged in a short chain. Its sequence is commonly written as Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-NH2, which includes a modified N-terminus and an amidated C-terminus. The molecule belongs to the melanocortin family and acts as a receptor agonist. Structural features such as the D-phenylalanine residue and the Nle substitution are associated with increased stability against enzymatic degradation relative to the natural parent peptide.
=== Diseases === Polycystic ovary syndrome and non-alcoholic fatty liver disease (NAFLD) are associated with insulin resistance. Hepatitis C also makes people three to four times more likely to develop type 2 diabetes and insulin resistance.
== Production and development == Mulligan Stew was developed in early 1971 by the USDA Extension Service, and filmed by the USDA Motion Picture Service (which for many years prior produced educational cinematic films and TV programs for public viewing). Mulligan Stew was developed based on plan and design proposals by Developmental Committees, Iowa State University Extension Service 4-H Nutrition Television Programs. The Expanded Food and Nutrition Education Program (EFNEP) provided a grant to produce the series. (4-H is the official youth outreach and development program of the land-grant universities' Cooperative Extension Services and USDA.) The target audience of the program was older elementary school students, fourth through sixth grade. Eleanor Wilson, the national 4-H TV coordinator at the time, was tapped to be the series' technical advisor. Wilson subcontracted with Iowa State University to develop an outline of educational concepts for the series. USDA Extension then hired Ira Klugerman to direct the series. Klugerman, who came from a background of children's television at WQED in Pittsburgh, Pennsylvania, came up with the title and general treatment for the series. V. "Buddy" Renfro was the credited producer. Production began on location in southeast Washington, DC in 1971 (the opening sequence was filmed at RFK Stadium). Other filming locations included major production partner Michigan State University's home base of Lansing, Michigan, and on location for one episode at Johnson Space Center in Houston.
Narirutin is a flavanone-7-O-glycoside, consisting of the flavanone naringenin bonded with the disaccharide rutinose. It is found in orange juice. Narirutin is found in citrus fruits such as Yuzu, grapefruit, mandarins, especially in their peels. There are reports that Narirutin is abundant in Jabara(A fruit discovered and grown in the Kitayama village, Wakayama prefecture, Japan). Narirutin is reported to be effective for allergies caused by immunoglobulin E antibodies. Those allergies include hayfever and some cases of food allergy.
The cover for the latter song included a musical sequence in the episode where it was featured, depicting Kimiko and Frenchie dancing and singing together across hospital, though it was not featured in the soundtrack in contrast to the former song which was briefly depicted in the premiere episode where Kimiko starts to sing after seeing a woman play the piano. A soundtrack album for the season was released digitally by Madison Gate Records on July 8, 2022.
Sources: en.wikipedia.org
=== Plot === Decay begins with Gina Cross and Colette Green arriving at the Anomalous Materials Labs at Black Mesa and reporting to Dr. Keller, who is readying the day's analysis of an unknown specimen. Despite the objections of Dr. Rosenberg to pushing the analysis equipment beyond its design capacities, Cross and Green are assigned to assist setting up the experiment for Gordon Freeman. When Freeman inserts the specimen into the scanning beam, however, it triggers a "resonance cascade", causing massive damage to the facility and teleporting alien creatures into the base. Keller and Rosenberg agree that Black Mesa cannot deal with the situation on its own, and so decide to call for military assistance. Cross and Green escort Rosenberg to the surface, where he sends a distress signal to the military. However, the military are ordered not only to contain the situation, but to silence the base by killing its employees. Rosenberg elects to stay behind to meet with the military on arrival and Cross and Green return to Keller. Once reunited with Keller, Cross and Green work to seal the dimensional tear to stop the invasion. The military arrive and try to remove all personnel as well as the alien force. After resetting key equipment to prevent a second dimensional rift, the two are tasked with preparing a satellite for launch. The satellite, which is launched by Freeman in Half-Life, is used in tandem with ground-based equipment to significantly weaken the effects of the resonance cascade.
==== Phytoplankton and bacteria ==== The δD of lipids from phytoplankton is largely affected by δD of water, and there seems to be a linear correlation between those two values. The δD of most other biosynthetic products in phytoplankton or cyanobacteria are more negative than that of the surrounding water. The δD values of fatty acids in methanotrophs living in seawater lie between −50 and −170‰, and that of sterols and hopanols range between −150 and −270‰. The HIC of photoautotrophs can be estimated using the equation,
An urgent issue that had to be addressed was the economic crisis that began in 1974. Minister of Economy Fuentes Quintana proposed the signing of a great "social pact" that would "compensate" the harsh adjustment measures that had to be taken through social improvements and some juridical-political reforms. This led to the Moncloa Pacts signed on October 27, 1977, which succeeded in stabilizing the economy and controlling inflation ─ from 26.4% in 1977 to 16.5 the following year ─ and social spending was increased in return ─ unemployment benefits, pensions, education and health spending ─ thanks to the tax reform implemented by Minister Francisco Fernández Ordóñez. Another pressing matter was the "regional question", since the demands for self-government on the part of Catalonia and the Basque Country did not admit any further delay. In the case of Catalonia, the restoration of the Statute of Autonomy approved by the Republic was demanded, but Suárez opted to approve a decree-law of September 29, 1977, which "provisionally" restored the Generalitat although without reference to the 1932 Statute which allowed the return from exile of the "president" Josep Tarradellas. For the Basque Country, the Basque General Council was constituted in December 1977 under the presidency of the socialist Ramón Rubial, but as in the case of Catalonia, the Statute of Autonomy approved by the Republic was not reestablished either.
Static chairs can include: standard hospital chairs; chairs with no cushions or manual/dynamic function; and chairs with integrated pressure redistributing surfaces and recline, rise or tilt functions. More research is needed to establish how effective pressure redistributing static chairs are for preventing pressure ulcers. For individuals with limited mobility, pressure shifting on a regular basis and using a wheelchair cushion featuring pressure relief components can help prevent pressure wounds.
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Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide modelled on alpha-melanocyte-stimulating hormone. A lactam bridge links two side chains, forming a ring that stabilises the molecule against proteolysis. It belongs to the broader melanocortin peptide family.
No national medicines agency has approved melanotan-2 for clinical use. Afamelanotide, a related but distinct peptide, holds a marketing authorisation in the European Union for a rare photosensitivity disorder. Melanotan-2 itself is handled as a laboratory chemical.
Its broad activity across melanocortin receptors makes it a tool for probing pigmentation, appetite and vascular signalling. Early trials recorded skin darkening and other effects that were not the original focus of the work. Those observations generated hypotheses that later studies have examined.
No. It is a synthetic analogue carrying four amino acid changes, a lactam ring and an amidated C-terminus. The natural hormone is a linear thirteen-amino-acid peptide processed from proopiomelanocortin.