What Is PT-141?
A research guide to Bremelanotide, the melanocortin receptor agonist studied for its central nervous system effects on arousal and desire pathways.
The Basics
PT-141, also known as Bremelanotide, is a synthetic cyclic heptapeptide derived from Melanotan II. It is a melanocortin receptor agonist, meaning it activates melanocortin receptors (specifically MC3R and MC4R) in the central nervous system. Unlike most compounds studied in its research domain, PT-141 works through CNS pathways rather than vascular mechanisms.
The compound originated from research into melanocortin peptides and their effects on melanogenesis. During early studies of Melanotan II, researchers observed unexpected CNS-mediated effects that led to the development of PT-141 as a distinct research compound focused on melanocortin receptor signaling in the brain.
Key distinction: PT-141 acts through central melanocortin receptor pathways in the brain, not through peripheral vascular mechanisms. This makes it unique among compounds studied in its research domain and has generated significant interest in melanocortin signaling as a broader research area.
Research Background
PT-141 has undergone extensive clinical research, including multiple Phase II and Phase III trials. It is one of the most thoroughly studied melanocortin receptor agonists, with a substantial body of published research documenting its receptor binding profile, pharmacokinetics, and biological effects.
The melanocortin system is involved in a wide range of physiological processes including energy homeostasis, inflammation, cardiovascular function, and neuroendocrine signaling. PT-141’s selective activity at MC3R and MC4R has made it a valuable research tool for understanding how melanocortin signaling in the CNS influences downstream physiological responses.
Cyclic heptapeptide (7 amino acids) with the sequence Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH. Molecular weight approximately 1025.2 Da. Derived from the alpha-MSH analog Melanotan II.
Selective agonist of melanocortin receptors MC3R and MC4R in the central nervous system. Unlike vascular-acting compounds, it modulates CNS signaling pathways involved in arousal, desire, and neuroendocrine regulation.
Areas of Active Research
Melanocortin receptor signaling. PT-141 has been instrumental in advancing understanding of the melanocortin system’s role beyond pigmentation. Research using PT-141 has helped map MC3R and MC4R signaling pathways in the hypothalamus and other brain regions.
CNS-mediated physiological responses. The compound’s central mechanism of action has made it a model for studying how brain signaling translates into peripheral physiological effects. This research has implications for understanding CNS control of various autonomic and endocrine functions.
Melanocortin system pharmacology. As a selective MC3R/MC4R agonist, PT-141 is used in research to probe receptor selectivity, concentration-response relationships, and the pharmacological profile of melanocortin receptor subtypes.
What Researchers Should Know
PT-141 is supplied in lyophilized form and prepared with bacteriostatic water for research use. As a cyclic peptide, it has enhanced stability compared to linear peptides, but still requires appropriate storage conditions.
Research-grade PT-141 should have purity of 98% or higher verified by HPLC, with identity confirmed through mass spectrometry. Researchers should verify that their supplier provides batch-specific certificates of analysis documenting purity, identity, and peptide content.
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