Molecular Characteristics
Complete Specifications
Structural Composition
Ac-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-NH₂
Physical Properties
Melanotan II is a synthetic cyclic peptide analog of alpha-melanocyte-stimulating hormone (α-MSH). Cyclization between aspartic acid and lysine residues enhances conformational stability and resistance to enzymatic degradation compared to linear analogs. Additional modifications including norleucine substitution and D-phenylalanine incorporation contribute to structural persistence 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
Melanotan II is utilized as a synthetic melanocortin analog in research studies examining melanocortin receptor activation and downstream intracellular signaling pathways. Laboratory investigations focus on its role in:
- MC1R and MC4R Activation Models: Investigation of receptor binding dynamics and subtype selectivity profiles
- cAMP Signaling Studies: Evaluation of cyclic AMP–mediated intracellular cascades following receptor stimulation
- Receptor Interaction Research: Analysis of melanocortin receptor subtype cross-activation under experimental conditions
- Second Messenger Pathway Models: Examination of protein kinase A (PKA) activation mechanisms
- Receptor Desensitization Studies: Investigation of adaptive responsiveness following repeated stimulation
Experimental protocols commonly employ receptor-binding assays, melanocyte culture systems, and intracellular signaling analyses to characterize Melanotan II–mediated melanocortin responses.
Pigmentation and Melanocyte Biology Research
Melanotan II has been extensively studied in research models examining melanogenesis and pigment-related cellular pathways. Key areas of investigation include:
- Melanin Synthesis Models: Evaluation of tyrosinase activity and pigment production signaling
- Melanosome Formation Studies: Investigation of organelle maturation and pigment transport processes
- Photobiology Research Models: Analysis of melanocortin signaling interactions in UV-associated experimental systems
- Gene Expression Profiling: Research into transcriptional regulation of pigmentation-associated genes
- Pigment Distribution Studies: Examination of intracellular mechanisms influencing melanin dispersion
These studies utilize melanocyte cultures, enzyme activity assays, and gene expression analyses to evaluate pigmentation-related signaling dynamics.
Neuroendocrine and Appetite Signaling Research
Melanotan II has also been explored in research models examining central melanocortin system signaling and neuroendocrine regulation, including:
- MC4R Activation Studies: Evaluation of central receptor pathways involved in energy intake signaling
- Hypothalamic Signaling Models: Investigation of neural circuits associated with melanocortin pathway activation
- Neurotransmitter Interaction Research: Analysis of signaling cross-talk within central regulatory systems
- Receptor Selectivity Profiling: Examination of subtype activation characteristics under experimental conditions
Laboratory protocols assess neuronal activation markers, receptor binding kinetics, and downstream transcriptional responses using biochemical and molecular techniques.
Cellular Signaling and Regulatory Pathway Research
Additional research applications explore Melanotan II’s influence on intracellular regulatory systems involved in melanocortin pathway modulation and cellular homeostasis, including:
- MAPK and CREB Pathway Studies: Investigation of transcriptional activation cascades following receptor stimulation
- Gene Expression Profiling: Analysis of melanocortin-associated transcription factor activity
- Signal Duration and Potency Research: Examination of intracellular response kinetics
- Integrated Melanocortin Network Models: Analysis of coordinated receptor interactions maintaining pathway equilibrium
Research in this domain focuses on understanding how Melanotan II influences melanocortin receptor signaling, pigmentation pathways, and neuroendocrine regulatory systems 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
Melanotan II 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, Melanotan II supports consistent use in in vitro and analytical research applications.
Frequently Asked Questions
What is Melanotan II?
Melanotan II is a synthetic peptide analog of α-MSH engineered to interact with melanocortin receptors in experimental models. It is commonly used in research exploring melanocortin receptor signaling mechanisms.
What is Melanotan II commonly researched for?
In laboratory and preclinical models, Melanotan II is studied for:
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Melanocortin receptor activation (MC1R, MC3R, MC4R, etc.)
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Melanogenesis pathway research
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Pigmentation signaling mechanisms
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Neuroendocrine melanocortin system investigations
All applications are exploratory and conducted in controlled research environments.
How does Melanotan II differ from Melanotan I?
Melanotan II is structurally distinct from Melanotan I and is a cyclic peptide, which may influence receptor binding characteristics and stability in research models. The two compounds differ in receptor selectivity and signaling profiles.
Is Melanotan II naturally occurring?
No. Melanotan II is a synthetically engineered analog and does not occur naturally in biological systems. It is designed to mimic and modify aspects of α-MSH signaling for research purposes.
How is Melanotan II supplied?
Melanotan II is typically supplied as a lyophilized (freeze-dried) powder in sealed research vials to preserve stability during storage and shipment.
How should unreconstituted Melanotan II be stored?
Lyophilized Melanotan II should be stored:
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Long-term: −20 °C to −80 °C
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Short-term: 2–8 °C
Keep vials sealed and protected from light and moisture until use.
How should reconstituted Melanotan II be handled and stored?
Once reconstituted:
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Store at 2–8 °C for short-term laboratory use
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For extended storage, aliquot and freeze at −20 °C or below
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Minimize freeze–thaw cycles using single-use aliquots
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Gently swirl to mix; avoid vigorous agitation
Does Melanotan II require a Certificate of Analysis (COA)?
Yes. A Certificate of Analysis (COA) should be available for each batch, verifying the identity and purity of each peptide component within the blend to ensure research quality and traceability.
Is Melanotan II FDA-approved?
No. Melanotan II 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.
