alpha-MSH 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.
Updated 2026-06-21. Numbers and descriptions here follow the published literature rather than marketing material.
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.
Melanocytes are the pigment-producing cells of the skin, and they carry melanocortin-1 receptors on their surface. When the receptor is activated, cyclic adenosine monophosphate rises inside the cell and raises the activity of enzymes such as tyrosinase, which increases melanin output. Melanotan-2 binds melanocortin-1 receptors in vitro and in animal models, and this binding is generally described as the basis for the tanning effect. Other receptors account for different effects: melanocortin-4 receptors contribute to appetite and erectile signalling, while melanocortin-3 and melanocortin-5 receptors contribute to energy balance and exocrine function.
Early published reports described melanotan-2 as a tanning agent without sun protection, which means darkening is not the same as protection against ultraviolet radiation. Later studies explored the peptide in erectile dysfunction, hemorrhagic shock, and some skin conditions. No regulator in the United States or Europe has approved it for clinical use. Many products labelled melanotan-2 are sold without approval and their identity and purity are unverified. Its long-term safety in humans remains an open question.
Melanotan-2, also written Melanotan II, is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, and the lactam bridge between the aspartate and lysine side chains constrains the peptide into a ring. This structural change increases receptor affinity and metabolic stability relative to the native hormone. The compound was created in the 1980s as a research tool for studying pigmentation biology.
| 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 |
=== Differential diagnosis === Juvenile idiopathic arthritis may closely resemble the clinical presentation of some osteochondrodysplasias or genetic skeletal dysplsias. In that, both conditions can present with swollen, stiff and deformed joints. Type II collagen disorders are caused by variants in the COL2A1 gene. Type II collagen disorders can result in mild disease or severe which can cause death within weeks of birth. Infants with the severe form of the disease would be born with clear indications of the disease, such as disproportionate short stature, skeletal dysplasia, distinctive eye abnormalities, cleft palate, and others. However, infants with mild disease may only experience arthritis at birth, but may progress to more severe disease later in life. Early diagnosis can be challenging. Furthermore, type II collagenopathies have significant phenotypic overlap with conditions such as MPS. Guidelines are available to ensure healthcare professional are aware of the conditions and the symptoms of disease to support efficient diagnosis.
The vagina loquens, or "talking vagina", is a significant tradition in literature and art, dating back to the ancient folklore motifs of the "talking cunt". These tales usually involve vaginas talking by the effect of magic or charms, and often admitting to their lack of chastity. Other folk tales relate the vagina as having teeth – vagina dentata (Latin for "toothed vagina"). These carry the implication that sexual intercourse might result in injury, emasculation, or castration for the man involved. These stories were frequently told as cautionary tales warning of the dangers of unknown women and to discourage rape. In 1966, the French artist Niki de Saint Phalle collaborated with Dadaist artist Jean Tinguely and Per Olof Ultvedt on a large sculpture installation entitled "hon-en katedral" (also spelled "Hon-en-Katedrall", which means "she-a cathedral") for Moderna Museet, in Stockholm, Sweden. The outer form is a giant, reclining sculpture of a woman which visitors can enter through a door-sized vaginal opening between her spread legs. The Vagina Monologues, a 1996 episodic play by Eve Ensler, has contributed to making female sexuality a topic of public discourse. It is made up of a varying number of monologues read by a number of women. Initially, Ensler performed every monologue herself, with subsequent performances featuring three actresses; latter versions feature a different actress for every role.
Around the elements in the middle of the periodic table, isotopes that are lighter than stable isotopes of the same element tend to decay through electron capture, while isotopes heavier than the stable ones decay by electron emission. Electron capture happens most often in the heavier neutron-deficient elements where the mass change is smallest and positron emission is not always possible. When the loss of mass in a nuclear reaction is greater than zero but less than 2mec2 the process cannot occur by positron emission, but occurs spontaneously for electron capture.
=== Traditional Chinese medicine === Within traditional Chinese medicine E. sinensis was historically used to treat a variety of ailments, such as bruises, fractures, amenorrhea, postpartum blood stasis, and used as a pain reliever. Tubiechong could be prepared in different ways depending on what was being treated, preparation methods include, grinding, frying, water extraction, and rice wine extraction. The most common method being water or rice wine extraction. Only the females are used in medicine. There are claims by TCM physicians that Tubiechong can reduce and treat tumors, via actions on blood vessels. The apparent effect on the blood vessels is why it was prescribed for the ailments it was (and still is).
Sources: en.wikipedia.org
Some dinoflagellates that lost their photosynthetic ability later regained it through new endosymbiotic events with different algae. While able to perform photosynthesis, many of these eukaryotic groups are mixotrophs and practice heterotrophy to various degrees.
== Measurement and values == Measurement is done from a sample of venous blood using immunological measuring mechanisms like ELISA, RIA, etc. Often these are done by automated machines to minimize human error.
=== Plan Colombia === Plan Colombia was a joint security scheme spearheaded by the US and in cooperation with Colombia from 2000 to 2015. The Plan aimed to decrease drug cultivation in Colombia, decrease drug cartel and left-wing insurgency (FARC) violence, and spur economic growth in Colombia. It involved sending trillions in economic and military support to Colombia. Around 80% of the funding was military aid, and overall, the anti-insurgency component of the plan cost the US $500 billion.Paley argues that this heavily security-focused funding was purposeful, as it developed Colombia into an environment that was much more stable to allow foreign investment into the country's natural resource wealth, something she argues was the plans true intention. The US government justified their militarisation of Colombia and their targeting of the FARC in the plan by accusing them of being drug lords, framing their removal as necessary to protect Americans from FARC-trafficked drugs. US security organisations increasingly labelled them as major traffickers throughout the early 2000s. However, in reality, the FARC were not major contributors to the trade at all- in 2001, the Colombian government estimated that paramilitary groups controlled around 40% of the drug trade in the country, whilst the FARC only controlled 2.5%. Despite the erroneous accusation by the US government, the intensified security efforts of Plan Colombia ultimately reduced FARC numbers by around half.
== Research and development == Zoltán Takáts, Ph.D., a Hungarian research chemist associated with Semmelweis University, in Budapest, invented the intelligent surgical knife. He currently is Professor of Analytical Chemistry at Imperial College London (UK). His iKnife has been tested in three hospitals from 2010 through 2012. Following laboratory analysis of tissue samples in 302 patients that were included in a data base, they included 1624 of cancer and 1309 of non-cancer samples. The current pilot version for the iKnife cost the creating Hungarian scientist, MediMass Ltd. (Old Buda based company) participating in the research, colleagues at Imperial College, and the Hungarian government approximately £200 thousand (68 million HUF). According to Takáts, the investments will have been worth it, however, as the device is on a likely path to marketing. The instrument has been acquired by the Massachusetts Waters Corporation for development by MediMass Ltd., which identifies it as substantive innovative technology labelled, "Intelligent late" and "REIMS", according to their press release on 23 July 2014. The business transaction included all MediMass innovation, including patents, software, databases, and human resources related to the technology.
whole fish: the fish as it originally came from the water, with no physical processing drawn fish: a whole fish which has been eviscerated, that is, had its internal organs removed dressed fish: fish that has been scaled and eviscerated, and is ready to cook. pan dressed fish: a dressed fish which has had its head, tail, and fins removed, so it will fit in a pan. filleted fish: the "fleshy sides of the fish, cut lengthwise from the fish along the backbone. They are usually boneless, although in some fish small bones called “pins” may be present; skin may be present on one side, too. Butterfly fillets may be available. This refers to two fillets held together by the uncut flesh and skin of the belly" fish steaks: large dressed fish can be cut into cross section slices, usually half to one inch thick, and usually with a cross section of the backbone fish sticks: "are pieces of fish cut from blocks of frozen fillets into portions at least 3/8-inch thick. Sticks are available in fried form ready to heat or frozen raw, coated with batter and breaded, ready to be cooked" fish cakes: are "prepared from flaked fish, potatoes, and seasonings, and shaped into cakes, coated with batter, breaded, and then packaged and frozen, ready-to-be-cooked" fish fingers fish roe
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.
No. It is a laboratory-made peptide, while the natural hormone is alpha-melanocyte-stimulating hormone, a longer peptide produced by the pituitary gland and by skin cells. Melanotan-2 mimics only a short active region of that hormone and contains non-natural residues such as D-phenylalanine.