Everything below concerns melanocortin receptor. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-11-13. Numbers and descriptions here follow the published literature rather than marketing material.
Early research on PT-141 grew out of work on melanotan II, a related cyclic peptide studied for pigmentation. Investigators observed that centrally acting melanocortin agonists also influenced sexual behaviour in animal models, and the programme shifted toward that endpoint. A nasal formulation was evaluated in clinical trials but showed inconsistent absorption, and later studies used subcutaneous administration instead. Regulatory approval in the United States followed in 2019 for a defined population of premenopausal women with acquired, generalised hypoactive sexual desire disorder. That approval was specific to that group rather than a broad indication.
Bremelanotide acts as a non-selective agonist at melanocortin receptors, with reported activity at MC1R, MC3R, MC4R and MC5R. The proposed basis for its central effects is activation of MC4R populations in the hypothalamus, a region associated with appetite and reproductive signalling. Because the peptide carries a net positive charge and polar side chains, it does not cross biological membranes freely, which is one reason oral administration is not the standard route. Effects generally appear within an hour of parenteral administration and are described as centrally mediated rather than peripheral.
Bremelanotide, developed under the code PT-141, is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone. Its structure is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH, with a lactam bridge joining the aspartate and lysine side chains. The molecule has the formula C50H68N14O10 and a monoisotopic mass near 1025 daltons. It is commonly prepared as the acetate salt and appears as a white to off-white lyophilised powder in solid form. The free acid is the pharmacologically relevant species, while the counter-ion improves handling and dissolution.
Published discussion sits at the intersection of peptide chemistry, neuroendocrinology and sexual medicine. Trial reports emphasise change scores on validated instruments, while mechanistic papers focus on hypothalamic circuits and receptor selectivity. Because placebo response in this field is large, effect sizes are usually reported with confidence intervals rather than as isolated averages. Reviews note that female and male data sets are not interchangeable and should be read separately. Diagnostic terminology has been revised over time, which complicates comparison between older and newer studies.
Bremelanotide is a synthetic cyclic heptapeptide that acts on a family of G-protein-coupled receptors. It was designed as a structural analogue of alpha-melanocyte-stimulating hormone, the endogenous peptide associated with pigmentation and several central signalling pathways. A lactam bridge constrains the ring and slows enzymatic breakdown, which distinguishes it from the linear parent molecule. Research interest moved over time from pigment biology toward central nervous system effects, particularly circuits connected to sexual desire. Parenteral delivery is used because oral bioavailability is poor.
Early clinical work used an intranasal formulation, and later programmes switched to subcutaneous delivery for more consistent absorption. A subcutaneous product received regulatory approval in the United States in 2019 for premenopausal women with acquired, generalised hypoactive sexual desire disorder. Approval followed phase 3 trials in which active treatment separated from placebo on desire and distress measures, though the average difference was modest. Labeling carries a caution about transient blood pressure elevation, so cardiovascular history is assessed before prescribing. Questions about durability of benefit beyond several months remain open.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Cyclic heptapeptide | Synthetic analogue of alpha-MSH |
| Molecular formula | C50H68N14O10 | Acetate salt form commonly reported |
| Molecular mass | ~1025 Da | Monoisotopic value near 1025.2 |
| Key structural motif | Lactam bridge | Asp side chain to Lys side chain |
| Solid appearance | White to off-white powder | Lyophilised and hygroscopic |
Bremelanotide acts as an agonist at several melanocortin receptors, with the strongest reported activity at MC4R and measurable activity at MC1R and MC3R. Because MC4R is expressed in hypothalamic and limbic circuits, the proposed mechanism links receptor activation to modulation of central pathways involved in desire rather than to direct effects on peripheral genital tissue. The precise downstream steps remain incompletely characterized, and evidence for the involvement of specific neurotransmitters is suggestive rather than settled. Nausea and blood pressure elevation reported during trials are consistent with melanocortin signaling outside the intended target circuit.
Compared with melanotan II, bremelanotide is a smaller cyclic peptide with a more constrained backbone, which affects receptor selectivity and metabolic stability. Published descriptions give a plasma half-life on the order of a few hours after subcutaneous administration, with elimination through hepatic and renal routes and limited plasma protein binding. Central access is inferred from effects observed in animal models, although direct measurement in humans is limited. Handling and storage requirements follow from the peptide backbone, which is susceptible to hydrolysis and oxidation.
Traditional markets in Singapore are subsidized by the government. The Tekka Market, Tiong Bahru Market, and Chinatown Complex Market are prominent markets containing seasonal fruit, fresh vegetables, imported beef, and live seafood. In the early 1990s, the slaughter of animals was banned in 12 inner-city markets and 22 market centers in Singapore. In early 2020, the National Environment Agency issued advisories for "high standards of hygiene and cleanliness" for the 83 markets that it oversees in a response to the 2020 coronavirus pandemic.
===== Neuraminidase (NA) removal of sialic acid ===== Neuraminidase (NA) removal of cytotoxic T lymphocytes from the surface of malignant cells stimulates natural killer cells and cytotoxic T lymphocytes. Increased sialylation levels on the cell membrane have been linked to a heightened potential for invasion and metastasis in cancer cells. This correlation has been observed across various models, including murine, rat, and human, and is associated with the progression of malignancy. Some sialylation inhibitors can make cancer cells less malignant. One possible explanation for the relationship between increased sialylation and a malignant phenotype is that sialylation results in a thick layer of coating on the cell membrane that masks cancer antigens and protects malignant cells from immune surveillance. The activity and cytotoxicity of NK cells is inhibited by the expression of sialic acids on the tumor cell surface. Removal of sialic acid residues from the surface of tumor cells makes them available to NK cells and cytotoxic T lymphocytes and, therefore, reduces their growth potential. Moreover, treating tumor cells with sialidase improves activation of NK cell secretion of IFN-γ. Some paramyxoviruses, including SeV encode and synthesize neuraminidase (sialidase), which can remove sialic acid residues from the surface of malignant cells. Hemagglutinin-neuraminidase (HN) is a single protein that induces hemagglutination and possesses neuraminidase (sialidase) activity. Neuraminidase (NA), a subunit of the HN protein, binds to and cleaves sialic acid from the cell surface.
Postinflammatory hyperpigmentation (PIH) is a skin condition characterized by the darkening of the skin (hyperpigmentation) following an inflammatory injury, such as acne, dermatitis, infectious disease, or trauma. Less frequently, it may occur as a complication of a medical procedure performed on the skin. It is a common cause of skin discoloration and can affect individuals of all skin types.
=== Filming === England's Shepperton Studios and Ardmore Studios in Ireland and were used for the shooting of interior scenes, with most of the external West Berlin scenes shot in Dublin. A recreation of Checkpoint Charlie was constructed in Dublin's Smithfield Plaza. The exterior scenes in the East German Alps were filmed at Garmisch-Partenkirchen in Bavaria, West Germany. Scenes were filmed in the Netherlands in Noordwijk and at Amsterdam Airport Schiphol. The remainder of the film was shot in London, at several locations including HM Prison Wormwood Scrubs, Battersea Park, and Trafalgar Square. The exterior of George Smiley's safe house was located at 19 Bramerton Street in Chelsea. Richard Burton demanded that Le Carré rewrite his dialogue on the set, though the effect of his changes were limited. Le Carré opined in his autobiography The Pigeon Tunnel: Stories from My Life that Burton had mostly wanted him there as a drinking buddy, and to mediate his clashes with Ritt. "Burton was a literate, serious artist, a self-educated polymath with appetites and flaws that in one way or another we all share," he wrote of their relationship.
South African officials stated that the country had initially expected to attend the summit, while the French government denied having yielded to foreign pressure over the invitation list. Kenya was invited as one of the African partner countries. In late 2025, Macron reportedly considered inviting Chinese leader Xi Jinping to the Évian summit. Japan expressed concern to France that a Chinese invitation could affect G7 unity, amid heightened China–Japan diplomatic tensions.
Sources: en.wikipedia.org
Histopathology refers to the microscopic examination of various forms of human tissue. Specifically, in clinical medicine, histopathology refers to the examination of a biopsy or surgical specimen by a pathologist, after the specimen has been processed and histological sections have been placed onto glass slides. This contrasts with the methods of cytopathology, which uses free cells or tissue fragments. Histopathological examination of tissues starts with surgery, biopsy, or autopsy. The tissue is removed from the body of an organism and then placed in a fixative that stabilizes the tissues to prevent decay. The most common fixative is formalin, although frozen section fixing is also common. To see the tissue under a microscope, the sections are stained with one or more pigments. The aim of staining is to reveal cellular components; counterstains are used to provide contrast. Histochemistry refers to the science of using chemical reactions between laboratory chemicals and components within tissue. The histological slides are then interpreted diagnostically and the resulting pathology report describes the histological findings and the opinion of the pathologist. In the case of cancer, this represents the tissue diagnosis required for most treatment protocols.
== Awards and honors == 2003: USC Renaissance Scholar 2003: USC Chemistry Alumni Award for Outstanding Undergraduate Research 2006: Student Travel Award for Australian Peptide Society 2008: Poster Prize, Science at the Interface (University of Chicago) 2010: Collier Award, Gordon Conference, Microbial Toxins and Pathogenicity 2012: Vallee Foundation Travel Award 2013: Damon Runyon-Rachleff Innovation Award 2013: Young Chemical Biologist Award, International Chemical Biology Society 2013: Sontag Distinguished Scientist Award 2014: NSF CAREER Award 2015: Sloan Research Fellowship in Chemistry 2015: Novartis Early Career Award in Organic Chemistry 2016: Amgen Young Investigator Award 2018: Eli Lilly Award in Biological Chemistry 2021: Rao Makineni Lectureship, American Peptide Society Source:
In Germany, phenibut is not approved as a drug and, as a food supplement, is controlled under the German New Psychoactive Substances Act. In a 2023 assessment, the U.S. Food and Drug Administration (FDA) determined that phenibut does not meet the definition of a dietary ingredient, thereby making phenibut supplement products misbranded and illegal for marketing. FDA warning letters had been issued to supplement manufacturers marketing phenibut products as adulterated.
Olipudase alfa, sold under the brand name Xenpozyme, is a medication used for the treatment of non-central nervous system (CNS) manifestations of acid sphingomyelinase deficiency type A/B or type B. The most common side events include infections, infusion-related reactions, or gastrointestinal complaints (disease signs and symptoms in children). Historically referred to as Niemann-Pick disease types A (NPD A) and B (NPD B), acid sphingomyelinase deficiency is a genetic disorder. It belongs to the larger family of metabolic disorders called lysosomal storage diseases, in which fats build up within the parts of the body's cells that break down nutrients and other materials. This affects the way cells work and causes them to die, affecting normal functioning of tissues and organs. Acid sphingomyelinase deficiency is seriously debilitating and life-threatening since the build-up of fatty substances can cause brain damage and swelling of organs such as liver and spleen. Xenpozyme is the first acid sphingomyelinase deficiency-specific treatment. The replacement enzyme is produced by a method known as recombinant DNA technology: it is made by cells into which a gene (DNA) has been introduced, that enables them to produce the enzyme. Olipudase alfa was approved for medical use in Japan in March 2022, in the European Union in June 2022, and in the United States in August 2022. The US Food and Drug Administration (FDA) considers it to be a first-in-class medication.
Sources: en.wikipedia.org
The dioxide dissolves in acid to yield the trihydroxotellurium(IV) Te(OH)3+ ion; the red Te42+ and yellow-orange Te62+ ions form when tellurium is oxidized in fluorosulfuric acid (HSO3F), or liquid sulfur dioxide (SO2), respectively. It can form alloys with aluminium, silver, and tin. Tellurium shows fewer tendencies to anionic behaviour than ordinary nonmetals. Its solution chemistry is characterised by the formation of oxyanions. Tellurium generally forms compounds in which it has an oxidation state of −2, +4 or +6. The +4 state is the most stable. Tellurides of composition XxTey are easily formed with most other elements and represent the most common tellurium minerals. Nonstoichiometry is pervasive, especially with transition metals. Many tellurides can be regarded as metallic alloys. The increase in metallic character evident in tellurium, as compared to the lighter chalcogens, is further reflected in the reported formation of various other oxyacid salts, such as a basic selenate 2TeO2·SeO3 and an analogous perchlorate and periodate 2TeO2·HXO4. Tellurium forms a polymeric, amphoteric, glass-forming oxide TeO2. It is a "conditional" glass-forming oxide – it forms a glass with a very small amount of additive. Tellurium has an extensive organometallic chemistry (see Organotellurium chemistry).
The following list of Quechua ethnic groups is only a selection and delimitations vary. In some cases, these are village communities of just a few hundred people, in other cases ethnic groups of over a million.
Formaldehyde ( for-MAL-di-hide, US also fər-) (systematic name methanal) is a pungent colorless gas mainly used in the production of industrial resins, such as for particle board, coatings, plastics, pulp, paper, synthetic fibers, and textiles. A ~5% solution in water of formaldehyde is used as a disinfectant and fumigant in industrial, agricultural, and healthcare settings, and a ~37% solution is used to preserve tissue samples in labs. In 2024, the global production of formaldehyde was estimated at 26 million tons per year, and is a precursor to many other materials and chemical compounds. It is an organic compound with the chemical formula CH2O and structure H2C=O. The gas spontaneously polymerizes into paraformaldehyde. It is stored as a ~37% aqueous solution known as formalin, which consists mainly of the hydrate CH2(OH)2. It is the simplest of the aldehydes (R−CHO). Formaldehyde also occurs naturally. It is derived from the degradation of serine, dimethylglycine, and lipids. Demethylases act by converting N-methyl groups to formaldehyde. Formaldehyde is classified as a group 1 carcinogen and can cause respiratory and skin irritation upon exposure.
As part of the in-universe viral marketing campaign, a series of video segments for the series started to be released in the form of in-universe news reports from Vought News Network—a parody of the Cable News Network (CNN) as well as Fox News—called Vought News Network: Seven on 7 with Cameron Coleman through the Vought International YouTube channel. The video segments were released on the seventh day of each month over a period of seven months starting on July 7, 2021, and concluding on January 7, 2022. The video segments served as a bridge between seasons two and three, with each segment containing different stories that tease a series of events expected to happen on upcoming episodes and introducing new characters. Matthew Edison joined the series as Vought News Network anchor Cameron Coleman, a role that he would reprise in the series' third and fourth seasons. The character has also been reported to be a parody of Tucker Carlson. On May 13, 2022, it was released a faux poster for the in-universe fictional film Payback with every member of the superhero group in it with Soldier Boy at the front and center of the poster and the other members surrounding him from behind, serving as a parody and reference of The Avengers film series.
=== Terrestrial plants in aquatic environments === Terrestrial plants may undergo physiological changes when submerged due to flooding. When submerged, new leaf growth has been found to have thinner leaves and thinner cell walls than the leaves on the plant that grew while above water, along with oxygen levels being higher in the portion of the plant grown underwater versus the sections that grew in their terrestrial environment. This is considered a form of phenotypic plasticity as the plant, once submerged, experiences changes in morphology better suited to their new aquatic environment. However, while some terrestrial plants may be able to adapt in the short-term to an aquatic habitat, it may not be possible to reproduce underwater, especially if the plant usually relies on terrestrial pollinators.
Sources: en.wikipedia.org
PT-141 was the development code used for bremelanotide during its preclinical and early clinical programme. The peptide is now generally referred to by its international nonproprietary name.
The two compounds share the same cyclic core and are both non-selective melanocortin agonists. They differ chiefly at the C-terminus, where bremelanotide carries a free carboxylic acid and melanotan II a terminal amide.
Receptor binding profiles are well characterised in vitro, but the downstream pathway linking MC4R activation to behavioural effects is not fully mapped. Several intermediate neural circuits have been proposed without definitive confirmation.
It is a synthetic cyclic peptide that activates melanocortin receptors. It is given by injection and was approved in the United States in 2019 for a specific low-desire diagnosis in premenopausal women. It is not a hormonal therapy.