PT-141 (Bremelanotide) Research Guide: MC4R Pathway Studies

<p>PT-141, also known as bremelanotide, is a cyclic heptapeptide melanocortin receptor agonist derived from Melanotan II. Unlike its parent compound, PT-141 preferentially engages MC4R and has been extensively studied for its role in sexual behavior neuroendocrinology in animal models. Bremelanotide was approved by the FDA in 2019 under the brand name Vyleesi for hypoactive sexual desire disorder (HSDD) in premenopausal women, making it one of the few research peptides with a documented clinical development pathway.</p><h2>Molecular Profile</h2><p>Sequence: Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH | MW: 1025.2 g/mol | CAS: 189691-06-3</p><h2>MC4R Mechanism and CNS Pathway Research</h2><p>PT-141's primary mechanism involves activation of MC4R in the central nervous system, particularly in hypothalamic circuits involved in sexual behavior regulation. Unlike PDE5 inhibitors that act peripherally on vascular smooth muscle, the melanocortin pathway targeted by PT-141 operates centrally — making it relevant to neuroendocrinology research examining CNS-mediated aspects of reproductive behavior.</p><h2>Research Context</h2><p>The FDA approval of bremelanotide provides a well-characterized pharmacological and clinical reference dataset that informs laboratory research model design. Published Phase 3 trial data established dose-response relationships and safety parameters that researchers use when designing preclinical models.</p><ul><li>MC4R agonism and CNS sexual behavior circuit research</li><li>Comparative pharmacology vs. Melanotan II for receptor selectivity</li><li>Neuroendocrinology research examining melanocortin system function</li><li>Female sexual function pathway research in preclinical models</li></ul><p>Q: Is PT-141 the same compound as bremelanotide?</p><p>A: Yes. PT-141 is the research name and bremelanotide is the INN (international nonproprietary name). The FDA-approved pharmaceutical is marketed as Vyleesi.</p><p>Q: Is research-grade PT-141 the same as Vyleesi?</p><p>A: No. Research-grade PT-141 is for in-vitro laboratory research only and is not a pharmaceutical product. It is not equivalent to FDA-approved Vyleesi.</p><p>Related: PT-141 Product → | Melanotan II Research Guide → | Kisspeptin Research Guide → | Melanocortin Products →</p>