The short version of alpha-MSH fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-12-03 and is reviewed periodically as new material appears.
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.
The compound emerged from research programs in the 1980s that examined analogues of alpha-melanocyte-stimulating hormone for pigmentation and photoprotection. Investigators modified the native sequence to extend activity duration and potency. A related analogue, afamelanotide, was developed within the same broad line of inquiry and eventually gained approval in certain jurisdictions for a rare light-sensitivity condition. Melanotan-2 itself did not progress through the same regulatory route and has no approved therapeutic indication.
Lyophilised peptide powder is comparatively stable when kept dry, cold and protected from light. Once dissolved, the molecule is exposed to hydrolysis, oxidation and microbial growth, and degradation accelerates at higher temperatures and in alkaline solution. Repeated freeze-thaw cycles concentrate solutes and promote aggregation. Handling guidance for research peptides commonly clusters around freezer temperatures for powder and short refrigerated use for reconstituted solutions, with pH control and sterile technique applied throughout.
Verification of a purchased sample requires documentation linking a batch to a certificate of analysis, and that document should be read for the methods used rather than the headline purity figure. A single chromatographic percentage does not establish identity. Independent laboratories can perform identity and content assays, but no such test establishes that a product is suitable for human use. Claims about efficacy rest largely on small, early studies rather than on replicated controlled trials, and that gap remains open.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C50H69N15O9 | Free base; salt forms differ |
| Molecular weight | Approximately 1024 g/mol | Calculated for the free base |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water and polar solvents | Poorly soluble in non-polar solvents |
| Typical storage | -20 degrees Celsius, dry, protected from light | Refers to the solid form |
The compound was developed in the late 1980s and early 1990s by academic researchers investigating melanocortin signaling and pigmentation. Early work explored whether synthetic analogs could reproduce effects of the natural hormone under controlled conditions. The molecule never advanced through the full regulatory pathway required for approval as a medicine. From the mid-2000s onward it appeared in unregulated consumer markets, often distributed through informal channels. That gap between research origins and commercial availability shapes how the compound is discussed today.
Melanotan-2 is a synthetic peptide designed as an analog of alpha-melanocyte-stimulating hormone, a signaling molecule produced in the pituitary and skin. Its structure is a linear chain of seven amino acids that folds into a ring through an internal lactam bridge joining two side chains. The compound is sometimes written as MT-II or MEL-2 in informal and commercial contexts. It belongs to the melanocortin peptide family, a group of short signaling molecules that share a conserved core sequence recognized by melanocortin receptors.
Solid peptide kept dry at minus twenty degrees Celsius, shielded from light and moisture, is generally considered stable for extended periods. Solutions are divided into single-use aliquots and held at minus twenty or minus eighty degrees Celsius, because repeated freeze-thaw cycles promote aggregation and loss of material to container surfaces. Hydrolysis of the backbone and oxidation of tryptophan are the principal degradation routes in aqueous solution, and both accelerate at ambient temperature. Hygroscopic uptake after a vial is opened can also shift the actual mass weighed, which affects any concentration calculated from it.
Routine characterisation relies on reversed-phase high-performance liquid chromatography with ultraviolet detection near 214 nanometres, using a C18 column and a water-acetonitrile gradient containing trifluoroacetic acid. Electrospray ionisation mass spectrometry confirms the expected molecular mass and can reveal truncated or oxidised by-products that co-elute poorly. Sequence and stereochemistry require additional work, such as peptide mapping or amino acid analysis, because a chromatographic purity figure alone does not distinguish a diastereomer from the target peptide. Independent testing of research-grade material frequently shows measured content below the stated label, so a certificate of analysis is best read together with the method that produced it.
All adenosine receptor subtypes (A1, A2A, A2B, and A3) are G-protein-coupled receptors. The four receptor subtypes are further classified based on their ability to either stimulate or inhibit adenylate cyclase activity. The A1 receptors couple to Gi/o and decrease cAMP levels, while the A2 adenosine receptors couple to Gs, which stimulates adenylate cyclase activity. In addition, A1 receptors couple to Go, which has been reported to mediate adenosine inhibition of Ca2+ conductance, whereas A2B and A3 receptors also couple to Gq and stimulate phospholipase activity. Researchers at Cornell University have recently shown adenosine receptors to be key in opening the blood-brain barrier (BBB). Mice dosed with adenosine have shown increased transport across the BBB of amyloid plaque antibodies and prodrugs associated with Parkinson's disease, Alzheimer's, multiple sclerosis, and cancers of the central nervous system.
=== Photocatalysis === Being smaller than the wavelengths of visible light, nanoparticles can be dispersed in transparent media without affecting its transparency at those wavelengths. This property is exploited in many applications, such as photocatalysis.
== RNase L == Ribonuclease L or RNase L (for latent), ais an interferon (IFN)-induced ribonuclease which, upon activation, destroys all RNA within the cell (both cellular and viral) as well as inhibiting mRNA export. RNase L is an enzyme that in humans is encoded by the RNASEL gene in humans.
== Business and philanthropy career == Pritzker co-founded Pritzker Group Private Capital with his brother Anthony Pritzker, serving as managing partner before stepping down in 2017 to run for governor. Anthony Pritzker reported that the Pritzker Group generated a return of 28.7% from 2007 to 2012, focusing on investing in family businesses and other entrepreneurial enterprises. In 2008, he received the Chicagoland Chamber of Commerce's Entrepreneurial Champion Award for his efforts to promote economic development and job creation. Pritzker served as chairman of ChicagoNEXT, then-Chicago Mayor Rahm Emanuel's Council on Innovation and Technology, and founded 1871, a nonprofit digital startup incubator, which, as of February 2025, had created 15,000 jobs and raised $4 billion in venture capital, according to a memo by its CEO, Betsy Ziegler. He was involved in the creation of the Illinois Venture Capital Association and the Chicagoland Entrepreneurial Center. He also co-founded Chicago Ventures and funded the startups Techstars Chicago and Built in Chicago. Pritzker is a member of the Illinois State Bar Association and the Chicago Bar Association. He has also been active in philanthropy. The J.B. and M.K. Pritzker Family Foundation, founded in 2001, has given millions of dollars to numerous causes, particularly early-childhood education. Most notably, in 2015, the foundation gave $100 million to the Northwestern Law School, which was renamed the Pritzker Law School.
Sources: en.wikipedia.org
=== Earlier leaks === In 1976, two local trade unions complained of pollution within the plant. In 1981, a worker was accidentally splashed with phosgene as he was carrying out a maintenance job of the plant's pipes. In a panic, he removed his gas mask and inhaled a large amount of toxic phosgene gas, leading to his death 72 hours later. Following these events, journalist Rajkumar Keswani began investigating and published his findings in Bhopal's local paper Rapat, in which he urged "Wake up, people of Bhopal, you are on the edge of a volcano." In January 1982, a phosgene leak exposed 24 workers, all of whom were admitted to a hospital. None of the workers had been ordered to wear protective equipment. One month later in February 1982, an MIC leak affected 18 workers. In August 1982, a chemical engineer came into contact with liquid MIC, resulting in burns over 30% of his body. In October 1982, there was another MIC leak. In attempting to stop the leak, the MIC supervisor suffered severe chemical burns and two other workers were severely exposed to the gases. During 1983 and 1984, there were leaks of MIC, chlorine, monomethylamine, phosgene, and carbon tetrachloride, sometimes in combination.
The actions of Δ9-THC result from its partial agonist activity at the cannabinoid receptor CB1 (Ki = 40.7 nM), located mainly in the central nervous system, and the CB2 receptor (Ki = 36 nM), mainly expressed in cells of the immune system. The psychoactive effects of THC are primarily mediated by the activation of (mostly G-coupled) cannabinoid receptors, which result in a decrease in the concentration of the second messenger molecule cAMP through inhibition of adenylate cyclase. The presence of these specialized cannabinoid receptors in the brain led researchers to the discovery of endocannabinoids, such as anandamide and 2-arachidonoyl glyceride (2-AG). THC is a lipophilic molecule and may bind non-specifically to a variety of entities in the brain and body, such as adipose tissue (fat). THC, as well as other cannabinoids that contain a phenol group, possess mild antioxidant activity sufficient to protect neurons against oxidative stress, such as that produced by glutamate-induced excitotoxicity. THC targets receptors in a manner far less selective than endocannabinoid molecules released during retrograde signaling, as the drug has a relatively low cannabinoid receptor affinity. THC is also limited in its efficacy compared to other cannabinoids due to its partial agonistic activity, as THC appears to result in greater downregulation of cannabinoid receptors than endocannabinoids. Furthermore, in populations of low cannabinoid receptor density, THC may even act to antagonize endogenous agonists that possess greater receptor efficacy.
A lack of economy of size: as most fine chemicals are produced in quantities of less than a few 10 tons per year in multipurpose plants, there is little or no economy of size. The reactor trains of these plants are similar throughout the industry. Regardless of the size of the companies, their main constituents, the reaction vessels, have a median size of 4–6 m3 (140–210 cubic feet). Various products are made throughout a year in campaigns. Therefore, the unit cost per m3 per hour rarely varies with the size of the company. A dichotomy between ownership and management: the company's shares are listed on stock exchanges, and their performance is scrutinized by the financial community. Postponement of a single important shipment can affect a quarterly result. In the small and mid-sized companies, the owners are typically the major shareholders, often members of the same family. Their shares are not traded publicly and fluctuations in their financial performance are more easily coped with. Complicated business processes: flexibility and responsiveness are in jeopardy. Customer complaints, for instance, are difficult to resolve in a straightforward manner. A heterogeneous portfolio of small companies, accumulated over time through M&A activities. The key functions, such as production, R&D, and M&S, are located on different sites, often in different countries. Cohabitation with other units. A comprehensive list of about 1400 fine chemical companies (including traders) can be found in the "event catalogue" of the CPhI exhibition.
== Adverse effects == The most commonly reported side effects of tapentadol therapy are constipation, nausea, vomiting, headaches, loss of appetite, drowsiness, dizziness, itching, dry mouth, and sweating. Tapentadol has also been noted to induce feelings of relaxation and euphoria, and it may cause serious side effects such as respiratory depression, serotonin syndrome, addiction and substance dependence. Several studies have found that tapentadol causes less constipation and nausea compared with oxycodone. It has been noted that due to this, treatment adherence may be improved, with fewer people discontinuing tapentadol (when compared with oxycodone). Tapentadol has been demonstrated to reduce the seizure threshold in patients. Tapentadol should be used cautiously in patients with a history of seizures, and in patients who are also taking one or more other drugs which have also been demonstrated to reduce the seizure threshold. Patients at high risk include those using other serotogenic and adrenergic medications, as well as patients with head trauma, metabolic disorders, and those in alcohol and/or drug withdrawals. Tapentadol has been demonstrated to potentially produce hypotension (low blood pressure), and should be used with caution in patients with low blood pressure, and patients who are taking one or more other medications which are also known to reduce blood pressure.
In 2022, mRNA-4157/V940 drug candidate, a cancer vaccine, was studied alongside pembrolizumab for treatment of skin and pancreatic cancers. mRNA-4157/V940 went on to be granted breakthrough therapy designation by the FDA.
Sources: en.wikipedia.org
No. Melanotan-2 is manufactured synthetically. The naturally occurring peptide in the same family is alpha-melanocyte-stimulating hormone, which the body produces as part of normal endocrine and neural signalling.
Both are synthetic analogues derived from the same parent hormone. Reference descriptions usually characterise afamelanotide as more selective for the MC1R subtype, whereas melanotan-2 is reported to interact with a wider range of melanocortin receptors.
Early studies explored melanocortin signalling and pigmentation, which later led to informal use of the label tanning peptide. That label is not a regulatory category and does not imply approved status for any purpose.
Mass spectrometry combined with liquid chromatography provides both molecular weight confirmation and a measure of related impurities. Tandem mass spectrometry adds sequence information. A purity percentage reported without a mass measurement does not confirm what the material is.