Buy PT 141 (Bremelanotide): Central Melanocortin Receptor Signaling

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Reviewed by Dr. Elena Rostova

Molecular Pharmacology & Analytical Chemistry Reviewer

Expert in peptide receptor kinetics, cellular signaling pathways, and peptide stability.

⚠️ Laboratory Research Notice

All peptide compounds discussed in this guide are strictly intended for in vitro cellular research, analytical laboratory testing, and chemical evaluation. They are not approved for human or animal consumption, diagnostic use, or therapeutic applications.

PT 141, chemically known as Bremelanotide, is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (alpha-MSH). Unlike peripheral phosphodiesterase-5 (PDE-5) inhibitors (such as sildenafil) that act purely downstream via vascular smooth muscle relaxation, PT 141 acts centrally within the central nervous system to stimulate sexual arousal and libido pathways.

When researchers buy PT 141 for neuroendocrine studies, its cyclic lactam structure and selective affinity for central melanocortin receptors (MC3R and MC4R) make it a premier tool for investigating central neuro-sexual behavior in animal models.

Central Mechanism: MC3R and MC4R Activation in the Hypothalamus

PT 141 operates directly on the brain’s motivational circuitry:
– Hypothalamic Binding: Crosses the blood-brain barrier and binds to melanocortin-4 receptors (MC4R) in the medial preoptic area (mPOA) and paraventricular nucleus (PVN) of the hypothalamus.
– Dopamine Release: Activation triggers the release of dopamine in the nucleus accumbens, the primary reward and motivation center of the brain.
– Autonomic Erection Signaling: Stimulates pro-erectile autonomic pathways down the spinal cord to the pelvic nerve plexus, initiating physiological arousal independently of peripheral vascular tone.

🧭 Neuropeptide Pathway: Buy Pt 141

Step 1

Central Receptor Binding

PT 141 crosses the blood-brain barrier and selectively engages central MC4R and MC3R.

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Step 2

Hypothalamic Neurotransmission

Stimulates medial preoptic neurons to release dopamine in the mesolimbic circuit.

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Step 3

Spinal Cord Efferent Outflow

Transmits pro-erectile autonomic signals via parasympathetic pelvic pathways.

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Step 4

Central Libido Activation

Drives genuine neurological arousal rather than purely passive vascular dilation.

Chemical Profile of PT 141 (Bremelanotide)

Analytical specifications:

📊 Analytical Profile: Buy Pt 141

Analytical Metric	Specification
Amino Acid Sequence	Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-OH (cyclic lactam)
Molecular Formula	C50H68N14O10
Molecular Weight	1025.2 g/mol
Receptor Selectivity	MC4R (Ki = 3.8 nM), MC3R, minimal MC1R
Recommended Purity	≥ 99.0% by RP-HPLC

Laboratory Storage and Handling

Store dry lyophilized PT 141 vials at -20°C. Reconstitute with sterile bacteriostatic water. The cyclic lactam structure endows PT 141 with superior enzymatic stability compared to linear peptides. Store working solutions at 2°C to 8°C.

Frequently Asked Questions

❓ How does PT 141 differ from Melanotan 2?

PT 141 is a metabolite of Melanotan 2 featuring a free C-terminal carboxyl group instead of an amide. This change reduces MC1R skin-tanning affinity while preserving central MC4R sexual arousal signaling.