Description

Paramètres techniques

PT1412

musclepic 8

1. Classification and Formulation

From a product perspective, PT-141 can be classified into the following categories:

Pharmaceutical-grade raw material peptides: These PT-141 peptides typically have a purity of over 98%, are produced according to GMP standards, and undergo rigorous HPLC and mass spectrometry testing. They are mainly supplied to pharmaceutical companies and research institutions for formulation development or pharmacological research. These products have extremely high requirements for purity, aseptic control, and residual solvents.

Research-grade raw material peptides: These PT-141 peptides are primarily intended for laboratory research, with a purity generally between 95% and 98%. They are mainly used in cell or animal experiments. They are not used for human injection but play an important role in pharmacokinetic and mechanism-of-action studies.

Finished formulations: Some countries have approved PT-141 injections or nasal sprays as prescription drugs, such as the FDA-approved Bremlanotide (trade name Vyleesi) in the United States. These formulations are usually in lyophilized powder or liquid form, making them convenient for end-users to use directly, and offering higher safety and stability.

2. Chemical and Physical Properties

PT-141 is a cyclic heptapeptide with the molecular formula C50H68N14O10 and a molecular weight of approximately 1025.2 g/mol. Its structure is derived from -melanocyte-stimulating hormone ( -MSH), and structural optimization of the natural peptide chain enhances its stability and receptor selectivity.

Appearance and Color: High-quality PT-141 raw material powder is typically a white to off-white lyophilized powder with a fine texture, no lumps, and low hygroscopicity. A pale yellow or grayish-white powder is usually due to improper storage or slight oxidation from batch impurities.

Solubility: Soluble in water, acetate buffer, or sterile physiological saline, forming a clear, transparent solution. It is relatively stable in neutral or weakly acidic environments but easily degrades under strongly alkaline conditions.

Stability and Storage: PT-141 is sensitive to temperature and light and should be stored at -20 ℃ in the dark. The lyophilized state has a stability period of up to 24 months, while the solution state is recommended for short-term use.

Physicochemical Properties: Due to its cyclic peptide structure, it exhibits strong resistance to enzymatic hydrolysis, slow metabolism in vivo, and high bioavailability. It takes effect within 30 to 60 minutes after injection or nasal administration, with a duration of action lasting 8 to 12 hours.

3. Mechanism of Action and Pharmacological Characteristics

PT-141 is unique in that it directly activates MC3R and MC4R (melanocortin receptor subtypes) in the brain, thereby affecting the hypothalamic neural pathways related to libido. This mechanism of action allows it to enhance sexual arousal and desire without altering blood pressure or heart rate.

Unlike traditional sexual function improvement drugs, PT-141 does not rely on peripheral vasodilation, making it suitable for certain cardiovascular disease patients or those unresponsive to PDE5 inhibitors. Furthermore, it has been studied for improving mood disorders and regulating energy metabolism and neuroendocrine system balance.

4. Advantages Analysis

Rapid Onset of Action and Natural Effect: It takes effect approximately 30 to 45 minutes after administration, with a long duration of action that is independent of external stimuli, resulting in a response more closely resembling physiological states. Central Mechanism of Action: Unlike vascular drugs, PT-141 regulates sexual impulses through the central nervous system, showing good efficacy for hypoactive sexual desire disorder (especially female sexual dysfunction).

Strong Gender Applicability: In clinical trials, both men and women showed positive responses, with particularly significant efficacy in patients with female hypoactive sexual desire disorder (HSDD).

Good Tolerability and Mild Side Effects: Common mild side effects include facial flushing, mild nausea, and transient increase in blood pressure, which usually subside spontaneously within a few hours.

Diverse Formulations: It can be formulated into various delivery methods such as injections, nasal sprays, and transdermal gels to meet the needs of different users.

5. Production and Purification Process

PT-141 is produced using solid-phase peptide synthesis (SPPS) technology. Through the Fmoc chemical route, the amino acid chains are progressively extended and cyclized to form a stable structure. After synthesis, it undergoes TFA deprotection, precipitation, purification, and lyophilization processes. High-quality PT-141 is typically purified using high-performance liquid chromatography (HPLC) and mass spectrometry (MS) to confirm its molecular weight, ensuring a purity higher than 98%. Additionally, some pharmaceutical-grade products require endotoxin testing, sterility testing, and stability studies.

6. Application Areas

Clinical Applications: PT-141 has been approved for the treatment of hyposexuality disorder (HSDD) in women and has shown adjunctive efficacy in erectile dysfunction (ED) in men.

Research Uses: Used to study the role of the melanocortin system in neuroendocrine regulation, mood, and metabolic control; it can also serve as a model compound for neuroactive peptides.

Potential Expansion: Recent studies have shown that PT-141 has potential in improving depressive mood, promoting energy metabolism, and regulating appetite, offering possibilities for its future expansion into the field of neuropsychiatric disorders.

7. Storage and Usage Precautions

PT-141 lyophilized powder should be stored in a sealed container below -20 ℃, protected from light and moisture. Before use, it should be slowly warmed to room temperature and dissolved in sterile water for injection or physiological saline. The prepared solution should be used immediately or refrigerated for no more than 48 hours. Avoid mixing with alkaline solutions or solvents containing preservatives to prevent peptide chain degradation.

8. Summary

In conclusion, PT-141, as a high-quality peptide product, possesses high purity, good stability, and a unique pharmacological mechanism. Its product system has formed a standardized production chain from pharmaceutical to research-grade. Chemically, it has advantages such as cyclic peptide stability, resistance to enzymatic degradation, and good solubility. In terms of application, it not only effectively improves low libido but also possesses central regulatory potential and good safety. With the continuous advancement of peptide pharmaceutical technology and bioengineering processes, PT-141 is expected to find wider applications in the fields of neuroendocrine regulation, mental health, and metabolic regulation, becoming a representative of the next generation of functional biopeptides after traditional steroids and hormone drugs.