MT-2 (Melanotan 2Acetate)

MT-2 (Melanotan 2 Acetate) 5 mg - Premium Research Peptide | PeptideHubs

What is MT-2 (Melanotan 2 Acetate)? Overview
In the interdisciplinary field of skin pigmentation regulation, neuroendocrinology, and metabolism research, a synthetic peptide with multi-target activity is becoming a research focus—MT-2 (Melanotan 2 Acetate), a synthetic cyclic heptapeptide derived from α-melanocyte-stimulating hormone (α-MSH), developed by the University of Arizona in the 1980s. It is a non-selective melanocortin receptor agonist. It does not solely regulate skin pigmentation, but rather precisely activates multiple melanocortin receptor subtypes, simultaneously regulating pigmentation, libido, appetite, and energy metabolism, acting like a multifaceted physiological regulator, playing a synergistic role in a complex neuroendocrine network.

The unique advantage of this peptide lies in the perfect combination of its structural stability and potent activity. Compared to the limitations of natural α-MSH, which is easily and rapidly degraded by enzymes in vivo and has a short-lived effect, MT-2, after special cyclization modification and amino acid substitution, remains stable in the physiological environment and has a much higher affinity for melanocortin receptors than the natural hormone. Researchers have described it as a universal key that can simultaneously open multiple physiological doors, precisely targeting different receptor subtypes, while natural α-MSH is like a single key, only able to regulate a limited number of physiological pathways and easily degraded in vivo.

MT-2 (Melanotan 2 Acetate) Peptide Structure
Amino Acid Sequence: Ac-Nle-cyclo(Asp-His-D-Phe-Arg-Trp-Lys)-NH₂ (N-acetyl-leucine-cyclized (aspartic-histidine-D-phenylalanine-arginine-tryptophan-lysine)-amide), CAS No. 121062-08-6, molecular weight approximately 1024.18 Da, a cyclic heptapeptide in acetate form.

Its structural design is ingenious and highly targeted, with each modification aimed at enhancing activity and stability. Key highlights of the modifications include:

• Cyclic Structure: A cyclic conformation is formed through a lactam bridge between aspartic acid (Asp) and lysine (Lys), acting as a "stabilizing scaffold" for the peptide chain. This enhances receptor binding affinity, resists exopeptidase degradation, and significantly extends the in vivo half-life.

• Amino Acid Replacement: At position 4, leucine (Nle) replaces methionine in natural α-MSH, preventing enzymatic oxidation; D-phenylalanine (D-Phe) is introduced at position 7, protecting the peptide chain from protease cleavage and maintaining the crucial conformation required for receptor activation.

• Terminal Modification: Dual modification with N-terminal acetylation and C-terminal amidation further enhances molecular stability, reduces rapid metabolism in vivo, and optimizes lipid solubility, allowing for easy penetration of cell membranes and precise binding to target receptors.

This ingenious structural design makes MT-2 a highly efficient, non-selective melanocortin receptor agonist, capable of simultaneously binding with high affinity to four receptor subtypes: MC1R, MC3R, MC4R, and MC5R, triggering synergistic physiological effects across multiple pathways. When it binds to its receptors, it initiates a series of cascade reactions, regulating various physiological processes such as pigmentation, libido, and appetite. Researchers observing its signal transduction mechanism are amazed by the precision and potency of this synthetic peptide, demonstrating its ability to "achieve more with less."

To date, core research on MT-2 has been based on cell experiments, animal models, and preliminary human trials. Its multi-target regulatory mechanism has been clearly validated; however, due to safety concerns, it has not yet received approval from any global regulatory agency for human clinical use. Its core value lies in mechanistic exploration within the scientific research field.

MT-2 Peptide and Skin Pigmentation Regulation

MT-2's most classic and core research value lies in regulating skin pigmentation. It can induce natural skin darkening without excessive UV exposure, providing an important tool for studying skin photoprotection mechanisms. In skin cells and animal models, MT-2's pigmentation regulation has shown significant advantages.

Its core mechanism of action is clear and well-defined:

• Targeted activation of MC1R: It specifically binds to MC1R on the surface of skin melanocytes, activating the G protein signaling pathway, promoting the production of cyclic adenosine monophosphate (cAMP), and subsequently activating MITF (melanocyte-specific transcription factor), initiating the transcription and expression of tyrosinase.

• Promotion of melanin synthesis: Tyrosinase is a key enzyme in melanin production. Increased MT-2 activity accelerates the conversion of tyrosine to dopa and dopaquinone, ultimately synthesizing eumelanin, leading to skin pigmentation and a natural tanning effect.

• Enhanced photoprotection: Increased melanin production effectively absorbs ultraviolet radiation, reducing UV damage to skin cell DNA, lowering the risk of sunburn, and simultaneously aiding in the repair of damaged skin cells and alleviating oxidative stress damage.

Studies have confirmed that MT-2 can dose-dependently induce pigmentation. In animal models, significant skin darkening can be observed after short-term administration, and this pigmentation can last for several weeks, providing an important molecular tool for research on skin photoprotection and pigmentary disorders (such as vitiligo). MT-2 Peptide and Libido Regulation

Another important research value of MT-2 lies in its regulation of libido and sexual function. This effect stems from its activation effect on MC4R, providing a new direction for the study of the mechanisms of sexual dysfunction. It can easily cross the blood-brain barrier, act on MC4R receptors in the hypothalamus, trigger dopamine release, and thus regulate sexual arousal signals.

Its core manifestations of libido regulation include:

• Induction of spontaneous sexual arousal: In animal models and preliminary human trials, MT-2 can significantly enhance libido, induce spontaneous erection, shorten erection latency, and enhance erectile response, especially showing a significant improvement effect on male sexual dysfunction models.

• Regulation of central sexual signaling pathways: By activating MC4R in the ventromedial hypothalamus, it promotes the release of dopamine, oxytocin, and other neurotransmitters related to sexual arousal, regulates the central regulatory pathways of sexual response, and improves sexual function performance.

• No Significant Addiction: Unlike traditional sexual function improvement drugs, MT-2 works by regulating endogenous neuroendocrine pathways. Preliminary studies show no significant addictive potential, providing a safer tool option for related research.

Notably, this effect of MT-2 has also spawned related research directions. Its selective derivatives (such as PT-141) have become a hot topic in sexual dysfunction research, while MT-2 itself provides a basic model for research on the association between melanocortin receptors and sexual function regulation.

MT-2 Peptide and Appetite and Metabolic Regulation

MT-2, by activating the MC4R receptor, also exerts significant appetite suppression and metabolic regulation effects, which are of great value in the fields of weight management and energy homeostasis research. Its metabolic regulation effect is not simply appetite suppression, but rather the synergistic optimization of energy allocation through multiple pathways.

Its Core Regulatory Mechanism:

• Suppression of Appetite Signals: Activation of the MC4R in the hypothalamic appetite center reduces the transmission of hunger signals, lowers the desire for food intake, and has a significant inhibitory effect on the craving for high-calorie foods, helping to control calorie intake.

• Promotes energy expenditure: Activates energy metabolism pathways in peripheral tissues, promotes lipolysis and oxidation, increases basal metabolic rate, and reduces fat accumulation, especially significantly affecting visceral fat.

• Regulates energy homeostasis: Synergistically regulates appetite and energy expenditure, maintaining energy balance in the body. In obese animal models, MT-2 significantly reduces body weight and body fat percentage, providing a new molecular target for research on obesity and metabolic disorders.

Furthermore, MT-2 can induce a thermogenic response in mice, further increasing energy expenditure. Its metabolic regulatory effect is closely related to the multi-target activation of melanocortin receptors, providing an important tool for exploring the complex regulatory network of energy metabolism.

MT-2 peptide and neuroprotective and other effects: In addition to the above core effects, MT-2 also shows certain research potential in the field of neuroprotection. It also has certain regulatory effects on the immune system and exocrine gland function. Its multi-target characteristics make it an important tool for research in multiple fields.

Related studies have revealed the following:

• Neuroprotective effects: In animal models, MT-2 promotes peripheral nerve regeneration. Subcutaneous administration of 20 μg/kg significantly improves sensory function recovery in mice after sciatic nerve compression injury. This mechanism may be related to inhibiting neuroinflammation and reducing neuronal apoptosis.

• Immune and inflammatory regulation: By activating MC1R and MC3R, MT-2 can regulate immune cell activity, inhibit the overexpression of pro-inflammatory factors, and alleviate chronic inflammatory responses, providing new insights for research on inflammation-related diseases.

• Exocrine gland regulation: Activating MC5R, it participates in the regulation of exocrine gland functions such as sebaceous gland secretion, providing a reference for research on skin appendage function.

MT-2 Peptide and Safety

The safety of MT-2 is a key concern in scientific research. Preclinical and preliminary human studies show that adverse reactions are mostly dose-related and pose certain potential risks, necessitating strict limitation to research use:

• Common Reactions: Mild gastrointestinal discomfort (nausea, vomiting), skin flushing, headache, dizziness, mostly occurring during dose escalation and gradually subsiding as the body adapts; some subjects may experience uneven skin pigmentation, which gradually fades after discontinuation of the drug.

• Potential Risks: High doses may lead to serious adverse reactions such as rhabdomyolysis, acute kidney injury, and renal infarction; occasionally, persistent erection (requiring emergency intervention), hypertension, tachycardia, and other cardiovascular-related reactions have been observed; long-term use may increase the risk of melanoma.

• Important Reminder: MT-2 products from unofficial channels may have inconsistent purity (30%-95%), bacterial contamination, and incorrect ingredients, seriously affecting research safety; this peptide has not been approved for human use by any regulatory agency such as the FDA or EMA and is for research purposes only.

Overall, MT-2 is well-tolerated at standard research doses, but strict dosage control and adherence to research ethics are necessary to avoid non-research use.

Future MT-2 Research and Clinical Trials

As a non-selective melanocortin receptor agonist, MT-2's multi-target nature has made it a research hotspot in several fields. Although it has not progressed to Phase III clinical trials due to safety concerns, its research value continues to be explored:

• Completed Studies: Cell and animal experiments on skin pigmentation mechanisms, libido regulation pathways, appetite and metabolic regulation, and preliminary exploration of neuroprotection, as well as a small number of preliminary human trials, have clarified its multi-target mechanism of action.

• Ongoing Studies: Melanocortin receptor subtype-specific regulatory mechanisms, synergistic effects of MT-2 with other peptides, adjunctive treatment research for pigmentary disorders (such as vitiligo), and in-depth exploration of nerve regeneration and repair.

• Cutting-Edge Exploration: Structural optimization of MT-2, development of highly selective receptor agonists (such as tanning-specific peptides targeting MC1R and sexual function-regulating peptides targeting MC4R), reduction of off-target adverse reactions; exploration of its potential research value in obesity and neurodegenerative diseases.

Current research focuses on balancing the potent activity and safety of MT-2, enhancing receptor selectivity through structural modification, and expanding its applications in multiple research fields to provide more precise tools for studying the mechanisms of related diseases.

Our MT-2 (Melanotan 2 Acetate) has the following significant characteristics:

• Guaranteed Purity: Each batch of product undergoes dual testing by HPLC and mass spectrometry, with a purity ≥99%. Verified by an independent third-party laboratory, it is free from bacterial contamination and impurities, ensuring the accuracy and reliability of research data.

• Precise Dosage: 5 mg vials are ideal for research dosage requirements. Different concentrations can be flexibly configured according to experimental protocols, avoiding dosage waste and meeting various research scenarios such as cell experiments and animal models.

• Superior Stability: A lyophilized powder formulation, strictly adhering to GMP-level production standards, it can be stored for extended periods at -20°C with stable activity and no degradation, suitable for global laboratory transportation and storage conditions.

• Structural Purity: Utilizing a standard acetate form, the amino acid sequence and synthesis process strictly adhere to research-grade standards, completely consistent with the reference sequence, ensuring biological activity and experimental reproducibility.

• For Research Use Only: Clearly labeled "For Research Use Only," strictly limited to cell experiments, animal models, and research on melanocortin receptor-related mechanisms. Use for non-research purposes is strictly prohibited. A complete quality control report is provided.

For researchers exploring the biology of melanocortin receptors, skin pigmentation regulation, and neuroendocrine and metabolic mechanisms, MT-2 is undoubtedly a key tool molecule for unlocking multi-target physiological regulatory networks and driving breakthroughs in related fields.