PT-141 Nasal Spray

🔬 Product Overview: The Central Melanocortin Agonist for Sexual Neuroscience Research

Welcome to the forefront of neuroendocrine and sexual behavior research. At Buy Peptides Online USA, we are pleased to present our PT-141 (Bremelanotide) Nasal Spray—a specialized, ready-to-use formulation of the synthetic cyclic heptapeptide melanocortin agonist, designed for laboratory investigation into the central nervous system pathways governing sexual arousal, desire, and neuroendocrine function.

PT-141, known internationally as bremelanotide (FDA-approved in 2019 under the brand name Vyleesi®), represents a significant advancement in our understanding of centrally-mediated sexual function . Unlike peripherally-acting agents that target the vascular system, PT-141 is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) that acts as a non-selective agonist at melanocortin receptors, particularly MC3R and MC4R, which are expressed primarily in the hypothalamus and other limbic structures . This central mechanism of action makes it an invaluable tool for dissecting the neurobiological underpinnings of desire and arousal, independent of vascular or hormonal influences .

Our nasal spray format offers researchers a practical, non-invasive delivery method for animal model studies, eliminating the variables associated with reconstitution and providing a consistent, metered dose for reproducible research protocols. Intranasal administration provides a direct pathway to the central nervous system, bypassing the blood-brain barrier and first-pass hepatic metabolism, which is particularly relevant for studying this centrally-acting peptide .

🔍 What is PT-141 (Bremelanotide)?

Peptide Structure and Nomenclature:
PT-141 is a synthetic cyclic heptapeptide derived from Melanotan-II through structural modification. It has the following precise characteristics :

The Critical Structural Features:
PT-141’s unique structure confers its distinctive biological properties:

• Cyclic Lactam Bridge: A covalent bond between the aspartic acid and lysine side chains creates a rigid cyclic structure that enhances metabolic stability and receptor binding affinity .
• D-Phenylalanine Residue: The presence of D-Phe (rather than L-Phe) is critical for selective activation of melanocortin receptors involved in sexual behavior.
• Acetylated N-terminus: N-terminal acetylation protects against exopeptidase degradation, prolonging its bioactive half-life.

Melanocortin Receptor Pharmacology:
PT-141 acts as a non-selective agonist at melanocortin receptors, with the following profile:

• MC3R and MC4R: Primary targets expressed in the hypothalamus, limbic system, and brainstem. Activation of these receptors is responsible for the pro-sexual effects .
• MC1R: Also activated, which in other analogs (like Melanotan) stimulates melanogenesis, though this is not the primary research focus for PT-141.
• MC2R (ACTH receptor): Minimal activity, sparing the HPA axis from significant stimulation.
• MC5R: Activated but with unknown relevance to sexual function.

⚙️ Key Features & Technical Specifications

When you choose to buy research peptides online from Buy Peptides Online USA, you are selecting products manufactured to the highest standards for laboratory use.

• Mechanism of Action: PT-141 acts as a potent, centrally-acting melanocortin receptor agonist. Its binding to MC3R and MC4R in the hypothalamus triggers:
  • G_s Pathway Activation: Increases intracellular cAMP, leading to neuronal activation in key hypothalamic nuclei involved in sexual motivation and arousal.
  • c-Fos Expression: Administration in rats induces c-Fos immunoreactivity in hypothalamic neurons, confirming central activation .
  • Descending Modulation: Activates descending pathways that facilitate sexual responding in both males and females, independent of gonadal hormone status.
  • Erectile Response: In males, initiates penile erection via spinal and supraspinal mechanisms without requiring sexual stimulation .
• Distinction from Erectile Dysfunction Agents: Unlike PDE5 inhibitors (e.g., sildenafil) that act peripherally to enhance blood flow, PT-141 acts centrally to initiate sexual desire and arousal, making it a mechanistically distinct tool for research .
• Primary Research Focuses: Neurobiology of sexual behavior (desire, arousal, motivation), melanocortin receptor pharmacology, hypothalamic function, female sexual dysfunction models (hypoactive sexual desire disorder), male erectile function studies, and central nervous system drug delivery.
• Delivery Format: Pre-formulated nasal spray with a metered pump, ensuring consistent, reproducible dosing in animal model research. Intranasal delivery has been extensively validated for PT-141 in clinical research, demonstrating rapid absorption (T_max ~0.5 h) and dose-dependent effects .
• Purity: ≥98% (Verified by third-party HPLC and MS).
• Quality Verification: Every batch is accompanied by a Certificate of Analysis (COA) , utilizing High-Performance Liquid Chromatography (HPLC) to verify purity and Mass Spectrometry (MS) to confirm the peptide’s molecular weight (1025.16 Da) and sequence identity .

📊 PT-141 Specifications Table

🧪 Primary Research Applications

This nasal spray formulation serves as a versatile tool for multiple lines of scientific inquiry. Below are key research areas where PT-141 is commonly investigated:

🧠 Neurobiology of Sexual Desire and Arousal:
This is the most extensively studied area for PT-141, leveraging its unique central mechanism:

• Female Sexual Behavior Models: In ovariectomized female rats, PT-141 selectively stimulates solicitational behaviors (hops, darts, ear wiggling) without affecting lordosis or pacing, indicating a specific effect on sexual motivation rather than simply enabling copulation . This makes it a precise tool for dissecting the components of female sexual response.
• Desire vs. Arousal Distinction: Human research using intranasal PT-141 has demonstrated significant increases in subjective feelings of desire and genital arousal in premenopausal women with sexual arousal disorder, with 67% reporting desire vs. 22% on placebo (p=0.0114) . This provides a model for studying the subjective experience of sexual desire.
• Male Erectile Function: In healthy males and patients with erectile dysfunction, PT-141 induces erections in a dose-dependent manner without requiring visual sexual stimulation, with onset occurring approximately 30 minutes after intranasal administration . This allows study of the central erectile pathway independent of peripheral stimulation.

🧬 Melanocortin Receptor Pharmacology:

• Receptor Selectivity Studies: PT-141’s non-selective agonist profile at MC3R and MC4R makes it a valuable tool for studying the relative contributions of these receptor subtypes to various behaviors, using it in combination with selective antagonists.
• Signal Transduction: Its cyclic structure and metabolic stability make it ideal for studying G_s-coupled receptor signaling in neuronal cell lines and primary neuronal cultures.

⚕️ Hypothalamic Function and Neuroendocrine Research:

• Hypothalamic Nucleus Mapping: Administration of PT-141 to rats activates specific hypothalamic nuclei as shown by c-Fos immunoreactivity, allowing researchers to map the neural circuits involved in sexual motivation .
• Descending Pathway Tracing: When combined with pseudorabies virus tracing, PT-141 helps identify neurons that project from the hypothalamus to the spinal cord and periphery.

🔬 Comparative Models of Sexual Dysfunction:

• Hypoactive Sexual Desire Disorder (HSDD) Models: As the peptide class that led to the first FDA-approved treatment for HSDD, PT-141 is the reference compound for developing and validating animal models of this condition .
• Erectile Dysfunction Refractory to PDE5 Inhibitors: Research explores PT-141’s effects in models resistant to peripherally-acting agents, providing insight into alternative therapeutic pathways.

📈 Intranasal Drug Delivery Research:

• Nose-to-Brain Transport: PT-141 serves as a model compound for studying intranasal delivery of centrally-acting peptides. Clinical studies demonstrate rapid absorption (T_max 0.5 h) and dose-dependent effects, validating this route for CNS-targeted peptide therapeutics .

📝 Handling & Laboratory Use

Important Distinction:
This product is a PT-141 (Bremelanotide) Nasal Spray specifically formulated for research applications requiring non-invasive delivery. The peptide is pre-dissolved in a sterile, biocompatible solution appropriate for intranasal administration in laboratory animal models. It is ready to use and requires no reconstitution.

Storage Guidelines:

• Unopened: Store refrigerated at 2-8°C (36-46°F) . Do not freeze.
• In Use: After first use, maintain refrigeration and use within 30 days for optimal stability.
• Protection: Keep away from direct light and heat sources. For long-term storage of lyophilized material, -20°C is recommended .

Research Administration Considerations:

• Intranasal Delivery Validation: Intranasal administration of PT-141 has been extensively validated in clinical research. Studies demonstrate:
  • Rapid Absorption: Peak plasma concentrations achieved in approximately 30 minutes (T_max = 0.5 h) .
  • Dose-Dependent Effects: Erectile response and subjective arousal measures show clear dose-response relationships .
  • Well-Tolerated: Intranasal administration is well-tolerated with no nasal mucosa changes observed .
• Dosing Protocols: In published research, intranasal doses ranging from 7-20 mg have been studied in humans . For animal models, researchers must calculate appropriate dosing based on species and study protocol, typically ranging from 0.1-5 mg/kg depending on route and outcome measure.

Safety & Handling Precautions:

• For laboratory research use only. Not for human or veterinary use .
• Handle using appropriate personal protective equipment (PPE): gloves, lab coat, and eye protection.
• Use in a well-ventilated area.
• Dispose of unused material according to institutional biosafety guidelines.

✅ Why Choose Buy Peptides Online USA?

When you need to buy PT-141 nasal spray online in the USA for research purposes, trust and verification are paramount. Here is why researchers consistently choose us:

🔬 Verified Quality Assurance:
We do not rely on claims. Each product batch is analyzed using Third-Party HPLC and Mass Spectrometry. You can view the Certificate of Analysis (COA) to verify the peptide’s Molecular Weight (1025.16 Da), sequence, and purity (>98%) .

🧪 Authenticity Guarantee:
Our peptides are sourced from GMP-compliant manufacturing facilities. We guarantee that the Molecular Formula (C₅₀H₆₈N₁₄O₁₀) and Sequence (Ac-Nle-cyclo(-Asp-His-D-Phe-Arg-Trp-Lys)-OH) match the product specifications, ensuring your research is built on a foundation of quality .

📦 Fast & Discreet Shipping:
We understand that timely delivery is critical for ongoing research. We offer:

• Fast, reliable shipping across the USA
• Discreet, temperature-controlled packaging to maintain cold chain integrity
• Tracking information for all orders
• Free shipping on orders over $300

💼 Professional Research Support:
Our team understands the needs of the research community:

• Technical Consultation: Questions about handling, storage, or research applications? Our knowledgeable team is here to help.
• 24/7 Customer Support: We are available when you need us.
• Product Replacement: Clear policies for damaged or incorrect items.
• Research-Only Integrity: We provide clear, accurate information without medical claims or marketing exaggeration.

💳 Secure & Flexible Payment:

• Secure checkout with data protection
• Crypto Payments Accepted: Bitcoin, Ethereum, and USDT
• Multiple payment options for your convenience

❓ Frequently Asked Questions (FAQ)

Q: What is the primary function of PT-141 in research?

A: PT-141 (bremelanotide) is primarily investigated as a centrally-acting melanocortin receptor agonist for studying the neurobiology of sexual desire and arousal. Its main research applications include investigating MC3R/MC4R pathways in the hypothalamus, modeling female sexual desire disorders, studying central erectile mechanisms, and exploring nose-to-brain peptide delivery .

Q: How does PT-141 differ from other agents used in sexual dysfunction research?

A: This is a key differentiator. Agents like PDE5 inhibitors (e.g., sildenafil) act peripherally on the vascular system to enhance blood flow. PT-141 acts centrally on melanocortin receptors in the brain to initiate sexual desire and arousal, making it a mechanistically distinct tool for studying the neurobiological basis of sexual motivation independent of vascular effects .

Q: Is this PT-141 product ready to use?

A: Yes. Unlike lyophilized powders that require reconstitution with bacteriostatic water or acetic acid, our PT-141 Nasal Spray arrives pre-formulated and ready for research use. This eliminates variables associated with reconstitution and ensures consistent dosing.

Q: How is the purity of PT-141 verified?

A: Every batch undergoes rigorous third-party testing using High-Performance Liquid Chromatography (HPLC) to verify purity (≥98%) and Mass Spectrometry (MS) to confirm the peptide’s identity and Molecular Weight (1025.16 Da) . These Certificates of Analysis are available upon request.

Q: Has intranasal PT-141 been validated in research?

A: Yes. Intranasal administration of PT-141 has been extensively validated in peer-reviewed clinical research. Studies demonstrate rapid absorption (peak plasma levels at ~30 minutes), dose-dependent effects on erectile function and subjective arousal, and a favorable tolerability profile with no nasal mucosa changes . This route is particularly relevant for studying centrally-acting peptides.

Q: What is the significance of PT-141’s cyclic structure?

A: The cyclic lactam bridge between the aspartic acid and lysine residues creates a rigid, stable structure that is resistant to enzymatic degradation . This enhances its metabolic stability and receptor binding affinity, making it a more robust tool for research compared to linear peptides.

Q: What receptors does PT-141 activate?

A: PT-141 is a non-selective agonist at melanocortin receptors, with primary activity at MC3R and MC4R, which are expressed in the hypothalamus and limbic system. This receptor activation is responsible for its pro-sexual effects . It has minimal activity at MC2R (the ACTH receptor), sparing the HPA axis.

Q: How should the PT-141 Nasal Spray be stored?

A: Store refrigerated at 2-8°C (36-46°F) at all times. Do not freeze. Protect from light. After first use, maintain refrigeration and use within 30 days for optimal stability. For long-term storage of lyophilized material, -20°C is recommended .

Q: Is this product for human use?

A: No. This product is sold strictly for research and laboratory use only . It is not a drug, food, or cosmetic, and is not for human or veterinary use. We maintain strict research-only integrity in all our products.

📦 Packaging & Shipping

• Packaging: Professional, discreet, temperature-controlled packaging to maintain cold chain integrity
• Domestic Shipping: Fast USA shipping (2-5 business days)
• International Shipping: Available worldwide (subject to local regulations)
• Free Shipping: On all USA orders over $300
• Tracking: Provided for all orders

⚠️ Important Notes & Warnings

• For Research Use Only: This product is intended for laboratory research purposes only . It is not for human consumption, not for medical use, and not for veterinary use.
• Regulatory Compliance: Buyers are responsible for compliance with all applicable local, state, and federal laws regarding the purchase and use of research peptides.
• Safety Data: Handle with appropriate laboratory safety protocols. Use personal protective equipment.
• No Medical Claims: We make no claims regarding diagnostic, therapeutic, or medical benefits. All information provided is for scientific reference only.

Ready to advance your sexual neuroscience research? Secure your supply of this premium PT-141 (Bremelanotide) Nasal Spray today. With verified purity, professional support, and fast, temperature-controlled shipping from the USA, Buy Peptides Online USA is your trusted partner for quality research peptides.

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