PT-141 (Bremelanotide)

PT-141 (Bremelanotide) is a synthetic cyclic heptapeptide melanocortin receptor agonist derived from Melanotan II. Unlike its parent compound, PT-141 was specifically designed to target MC3R and MC4R receptors in the central nervous system. This research-grade peptide is extensively studied for its effects on melanocortin signaling pathways in laboratory settings. PT-141 is utilized as a tool compound in neuroscience research to investigate melanocortin receptor pharmacology and central nervous system signaling. All discussion herein is limited to experimental research contexts and does not imply applied, therapeutic, or physiological use.

PT-141 is employed in laboratory research to study melanocortin receptor signaling in the central nervous system. Common experimental applications include receptor binding assays, neuronal activation studies, and melanocortin pathway investigations. Research protocols utilize PT-141 to investigate the role of MC3R and MC4R in hypothalamic function and their downstream effects on various physiological processes in preclinical research models.

Mechanistically, PT-141 activates MC3R and MC4R, which are G-protein coupled receptors that signal through adenylyl cyclase activation and cAMP production. In the hypothalamus, this leads to modulation of neuronal circuits involved in various physiological processes. The peptide's interaction with central melanocortin receptors involves pathways in the paraventricular nucleus and other hypothalamic regions. These central effects are mediated through neuronal circuits distinct from peripheral melanocortin signaling.

Preclinical investigations of PT-141 include in-vitro receptor binding studies and in-vivo animal models evaluating melanocortin receptor activation and downstream signaling. Reported findings include selective MC3R/MC4R activation with reduced MC1R binding compared to Melanotan II. Animal studies explore the peptide's interactions with central nervous system melanocortin pathways and their effects on various neuronal circuits. All findings are interpreted strictly within the context of laboratory research models.