PT-141, also known as Bremelanotide, was derived from a synthetic melanocortin analog known as Melanotan 2 (MT-2). A melanocortin analog, such as PT-141 and MT-2, is considered to be any synthetic compound designed to mimic or influence the functions of natural melanocortin peptides. These peptides, such as the alpha-melanocyte stimulating hormone (α-MSH), may be involved in a range of physiological processes including appetite regulation, energy homeostasis, immune responses, and skin cell pigmentation. PT-141 is a melanocortin analog that was developed to interact with Melanocortin-4 Receptor (MC-4R). It has been studied for a variety of potential characteristics and bioactivities through its interaction with this receptor. Apart from MC-4R, there are other melanocortin receptors like MC-1R, MC-2R, MC-3R, and MC-5R, each associated with different potential functions. For instance, MC-1R may be primarily involved in skin cell and hair follicle pigmentation, MC-2R appears to play a crucial role in the adrenal axis and stress response, MC-3R is implicated in the regulation of energy homeostasis, and MC-5R has been linked to exocrine function and thus impacts processes such as sweating and sebum production.

Oxytocin is a small peptide comprising only nine amino acids, naturally produced in the hypothalamus and secreted by the posterior pituitary gland cells. It has also been isolated from placenta, ovaries, testes, adrenal glands, thymus, retina, and pancreas tissues. The active hormone is obtained by proteolytic cleavage of a larger precursor protein. It is no longer considered merely a neurohypophyseal hormone as its actions are considered to be far-reaching and include interaction with additional peptides. Oxytocin appears to be a protein with two independent natural functions. First, it appears to act as a neuropeptide produced by the hypothalamus to regulate bonding, reproduction, and birth. Oxytocin appears to be bloodborne and secreted by the placenta of pregnant animals to influence birth, milk production, and bonding with their young. Small amounts of the protein produced from testes may promote mating behavior and pair bonding.

Specifications

Other Known Titles: AOD-9604

Molecular Formula: C₇₈H₁₂₃N₂₃O₂₃S₂

Molecular Weight: 1815.1 g/mol

Sequence: Tyr-Leu-Arg-Ile-Val-Gln-Cys-Arg-Ser-Val-Glu-Gly-Ser-Cys-Gly-Phe

Sermorelin is among the growth hormone-releasing hormone (GHRH) analogs. It is classified as a GHRH as researchers have suggested that the peptide acts to induce the endogenous production and release of growth hormone (hGH). Growth hormone has been associated with numerous physiological activities, making Sermorelin and other GHRH analogs, potentially relevant in growth hormone-related research. Examples of studies employing GHRH analogs include research in the context of tissue scarring following cardiac dysfunction, as well as those examining bone density, renal function, dementia and seizure activity.

KPV is the C-terminal peptide stretch of alpha-melanocyte-stimulating hormone (alpha-MSH). The peptide consists of the last three amino acids of the alpha-MSH hormone. It has been explored for its potential anti-inflammatory properties at the cellular level. Comprising the amino acids L-Lys-L-Pro-L-Val, KPV represents the minimal sequence that may mitigate inflammation in experimental models. However, the precise mechanisms of its action still need to be further studied in order to be more fully understood.

This peptide’s various mechanisms may potentially differentiate from that of alpha-MSH, which researchers believe interacts with the melanocortin-1 receptors by theoretically activating the cAMP pathway. Instead, studies suggest a rapid and acute increase in intracellular calcium when KPV is introduced alongside N6-(L-2-phenyl isopropyl) adenosine (PIA), an adenosine agonist that inhibits the cAMP pathway.

Further data-gathering investigations using cells transfected with melanocortin-1 receptors have indicated that KPV may, in theory, elevate intracellular calcium levels. This may imply an additional type of interaction with this receptor. This calcium signaling is thought to contribute to the inhibition of the activation of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), a transcription factor involved in inflammatory responses. By potentially inhibiting NF-κB activation, KPV might modulate inflammatory processes within cells.

Melanotan 1 (MT-1) is a synthetic equivalent of alpha-melanocyte-stimulating hormone (alpha-MSH). The peptide has been exhaustively researched through observation of research models displaying signs of erythropoietic protoporphyria to reduce potential phototoxicity or UV-related damage.^[1] It has been suggested that the peptide may have the potential to influence diverse physiological processes like feeding patterns, central nervous system operations, blood pressure, and more.

Triptorelin is a synthetic analog of gonadotropin-releasing hormone (GnRH), potentially mimicking the structure and function of the natural hormone. It may bind to GnRH receptors, initially stimulating the hypothalamic-pituitary-gonadal (HPG) axis, leading to a temporary surge in luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels. In turn, LH and FSH are thought to stimulate endocrine cells, like testicular cells that produce testosterone (T). However, with prolonged exposure, Triptorelin appears to desensitize the GnRH receptors, resulting in suppressed production of LH and FSH, thereby apparently reducing testosterone and estrogen levels. This potential mechanism has been extensively researched in models of androgen deprivation, exploring its potential in various contexts such as prostate cancer cells and receptor-positive breast cancer cells.

Specifications

Molecular Formula: C₄₀₀H₆₂₅N₁₁₁O₁₁₅S₉

Molecular Weight: 9117.5 g/mol

Sequence: MFPAMPLSSL FVNGPRTLCG AELVDALQFV CGDRGFYFNK PTGYGSSSRR APQTGIVDEC CFRSCDLRRL EMYCAPLKPA KSA