Molecular Characteristics
Complete Specifications
Structural Composition
Ac-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-NH₂
Physical Properties
PT-141 (Bremelanotide) is a synthetic cyclic peptide derived from melanotan II and functions as a melanocortin receptor agonist. Cyclization between aspartic acid and lysine residues enhances conformational stability and resistance to enzymatic degradation compared to linear peptides. Structural modifications including norleucine substitution and D-phenylalanine incorporation contribute to increased stability under controlled research conditions. Lyophilized storage and protection from moisture, light exposure, and repeated freeze–thaw cycles help preserve peptide integrity and maintain analytical consistency during laboratory applications.
Research Applications
Melanocortin Receptor Signaling Research
PT-141 is utilized as a synthetic melanocortin receptor agonist in research studies examining melanocortin pathway activation and downstream intracellular signaling mechanisms. Laboratory investigations focus on its role in:
- MC3R and MC4R Activation Models: Investigation of receptor binding affinity and subtype selectivity profiles
- cAMP Signaling Studies: Evaluation of cyclic AMP–mediated intracellular cascades following receptor stimulation
- G-Protein–Coupled Receptor Research: Analysis of Gs-associated signaling pathways and downstream kinase activation
- Second Messenger Pathway Models: Examination of intracellular signaling amplification mechanisms
- Receptor Desensitization Studies: Investigation of adaptive responsiveness under repeated stimulation
Experimental protocols commonly employ receptor-binding assays, intracellular signaling analyses, and neuronal cell models to characterize PT-141–mediated melanocortin responses.
Neuroendocrine and Central Signaling Research
PT-141 has been examined in research contexts involving central melanocortin system activation and neuroendocrine regulatory pathways. Key areas of investigation include:
- Hypothalamic Signaling Models: Evaluation of intracellular pathways within central regulatory circuits
- Dopaminergic Interaction Studies: Investigation of cross-talk between melanocortin and dopamine-associated pathways
- Neurotransmitter Modulation Research: Analysis of signaling changes within central neural networks
- HPA Axis Interaction Models: Research into coordinated stress-response signaling mechanisms
- Central Receptor Mapping Studies: Examination of receptor distribution and activation patterns in laboratory systems
These studies utilize neuroimaging models, hormone quantification assays, and intracellular pathway profiling to evaluate central melanocortin signaling outcomes.
Peripheral Vascular and Autonomic Signaling Research
PT-141 has also been explored in research models examining autonomic and peripheral signaling mechanisms associated with melanocortin receptor activation, including:
- Nitric Oxide Pathway Studies: Evaluation of intracellular signaling linked to vascular modulation models
- Autonomic Nervous System Research: Investigation of signaling interactions within sympathetic and parasympathetic pathways
- Vascular Response Models: Analysis of receptor-mediated intracellular cascades influencing smooth muscle signaling
- Hormonal Feedback Interaction Studies: Examination of coordinated endocrine signaling systems
Laboratory protocols assess intracellular kinase activation, receptor expression levels, and signaling biomarkers using biochemical and imaging-based techniques.
Cellular Signaling and Melanocortin Network Research
Additional research applications explore PT-141’s influence on intracellular regulatory systems involved in melanocortin pathway modulation and systemic signaling balance, including:
- MAPK and ERK Pathway Studies: Investigation of downstream cascades associated with receptor activation
- Gene Expression Profiling: Analysis of transcriptional responses linked to melanocortin signaling
- Receptor Sensitivity Research: Examination of adaptive signaling modulation mechanisms
- Integrated Neuroendocrine Network Models: Analysis of coordinated receptor systems maintaining regulatory equilibrium
Research in this domain focuses on understanding how PT-141 influences melanocortin receptor–mediated signaling pathways, central regulatory networks, and intracellular adaptive responses under controlled experimental conditions.
Laboratory Handling and Storage Protocols
Lyophilized Powder Storage
- Store at –20°C to –80°C in the original, sealed vial
- Protect from light exposure and moisture
- A desiccated storage environment is recommended
- Stability data suggests extended stability when stored at −20 °C or below.
Reconstituted Solution Storage
- Short-term storage: Up to 7 days at 4°C
- Long-term storage: Store at –20°C in aliquots
- Use single-use aliquots to preserve peptide integrity
- Minimize freeze–thaw cycles; single-use aliquots are strongly recommended
Stability Characteristics
PT-141 is a synthetic peptide research compound that demonstrates stable handling characteristics when managed according to standard peptide laboratory protocols. Proper cold storage of the lyophilized material, protection from light, careful reconstitution, and minimized freeze–thaw exposure help preserve structural integrity and solubility. When handled appropriately, PT-141 supports consistent use in in vitro and analytical research applications.
Frequently Asked Questions
What is PT-141?
PT-141 is a synthetic melanocortin receptor agonist peptide engineered from melanocortin analog research. It is used in experimental models to investigate central melanocortin system signaling mechanisms.
What is PT-141 commonly researched for?
In laboratory and preclinical models, PT-141 is studied for:
-
Melanocortin receptor activation (MC3R and MC4R)
-
Neuroendocrine signaling pathway research
-
Central nervous system melanocortin interactions
-
Behavioral and receptor modulation models
All applications are exploratory and conducted in controlled research environments.
Is PT-141 related to Melanotan peptides?
Yes. PT-141 is structurally related to melanocortin analog peptides such as Melanotan II. However, it differs in receptor selectivity and signaling characteristics in research models.
Is PT-141 naturally occurring?
No. PT-141 is a synthetically engineered cyclic peptide and does not occur naturally in biological systems.
How is PT-141 supplied?
PT-141 is typically supplied as a lyophilized (freeze-dried) powder in sealed research vials to preserve stability during storage and shipment.
How should unreconstituted PT-141 be stored?
Lyophilized PT-141 should be stored:
-
Long-term: −20 °C to −80 °C
-
Short-term: 2–8 °C
Keep vials sealed and protected from light and moisture until use.
How should reconstituted PT-141 be handled and stored?
Once reconstituted:
-
Store at 2–8 °C for short-term laboratory use
-
For extended storage, aliquot and freeze at −20 °C or below
-
Minimize freeze–thaw cycles using single-use aliquots
-
Gently swirl to mix; avoid vigorous agitation
Does PT-141 require a Certificate of Analysis (COA)?
Yes. A Certificate of Analysis (COA) should be available for each batch, verifying peptide identity, purity, and analytical testing results to ensure research quality and traceability.
Is PT-141 FDA-approved?
Research-grade PT-141 is not FDA-approved as a drug, supplement, or therapeutic product. It is sold exclusively as a research compound and must not be marketed or used for diagnostic, therapeutic, or consumption purposes.
This product is not for human consumption. It is sold strictly for research and educational purposes and is not intended to diagnose, treat, cure, or prevent any disease.
Any clinical data or research information referenced on this page is derived from peer-reviewed scientific literature and official publications. This information is provided for educational reference only and does not constitute medical advice or product claims.
By purchasing this product, you acknowledge that you are a qualified researcher and agree to use it in full compliance with all applicable laws and regulations.
