Introduction to PT-141 for Research
PT-141 (bremelanotide) is a synthetic cyclic heptapeptide that functions as a potent agonist at melanocortin receptors, primarily mimicking the endogenous ligand α‑melanocyte‑stimulating hormone (α‑MSH). In laboratory settings, this peptide is widely utilized to probe receptor binding kinetics, intracellular signaling cascades, and the physiological functions of the central melanocortin system. Researchers who buy PT-141 bulk wholesale typically do so to support repeated receptor assays, longitudinal behavioral studies, or large‑scale screening campaigns in academic and pharmaceutical environments. All products described here are strictly for laboratory research use only and are not intended for any human or veterinary application, nor for use as active pharmaceutical ingredients.
Applications in Biomedical Research
The chemical structure of PT‑141 allows selective engagement with melanocortin receptor subtypes MC3R and MC4R, making it a valuable tool for dissecting neuropharmacological pathways. In vitro and in vivo models have contributed to a deeper understanding of how these receptors modulate energy homeostasis, behavioral responses, and metabolic signaling. Use of this peptide remains confined to preclinical investigations; no conclusions regarding clinical utility can be drawn from research findings.
Receptor Binding Assays
PT‑141 is frequently employed as a reference ligand in competitive radioligand binding experiments. Its high affinity for MC4R, and slightly lower affinity for MC3R, enables precise determination of receptor specificity when testing novel compounds. Typical protocols involve incubation of the peptide with cell membrane preparations expressing recombinant melanocortin receptors, followed by displacement of a labeled tracer. Data generated from these assays help characterize binding constants (Ki, IC50) and map structure‑activity relationships. Additionally, PT‑141 can be used to validate functional selectivity by comparing recruitment of intracellular effectors, such as cyclic AMP or β‑arrestin, in transfected cell lines.
Neuropharmacology and Behavior
In rodent models, central administration of PT‑141 has been reported to influence neuronal activity in hypothalamic and limbic regions. Studies monitoring food intake and body weight have shown that activation of MC4R by this peptide reduces feeding and increases energy expenditure, thereby offering a pharmacological probe for appetite regulation research. Behavioral paradigms involving stress reactivity and reproductive behavior have also incorporated PT‑141 to examine melanocortin‑mediated modulation of the hypothalamic‑pituitary‑adrenal axis and sexual motivation pathways. For instance, infusions into the medial preoptic area have been linked to changes in lordosis responses in female rats. All such experiments remain strictly within the domain of basic neuroscience; the material is not designed for therapeutic evaluation.
Quality Assurance and Purity Standards
Every batch of PT‑141 supplied for research is subjected to rigorous analytical characterization. High‑performance liquid chromatography (HPLC) confirms purity exceeding 98%, while electrospray ionization mass spectrometry (ESI‑MS) verifies the molecular weight against the theoretical mass of the peptide. Identity is further corroborated by amino acid analysis and, when required, Edman degradation or tandem mass spectrometry sequencing. The peptide is provided as a lyophilized powder, ensuring chemical and physical stability during storage and shipment. Researchers can request a certificate of analysis detailing the specific lot parameters, including residual solvent content and counter‑ion composition.
Bulk Wholesale Options
To accommodate the needs of large‑scale discovery programs and distribution partners, we offer flexible purchasing models for those wishing to buy PT-141 bulk wholesale. Volumes can be scaled from small validation aliquots to multigram quantities, with tiered pricing that reflects order size and frequency. Dedicated account managers assist in forecasting and inventory planning to ensure uninterrupted supply for long‑term projects.
Minimum Order Quantities (MOQs)
- The standard minimum order for bulk PT‑141 starts at 1 gram of net peptide content.
- For initial feasibility testing or assay development, smaller aliquots (e.g., 10 mg or 50 mg) are available from existing stock, allowing laboratories to qualify the peptide before committing to larger batches.
- Volume‑based discounts become applicable for orders exceeding 10 grams, with further price reductions negotiated for multi‑kilogram contracts.
Custom Synthesis and Labeling
Beyond the standard wild‑type sequence, specialized research demands can be met through custom synthesis services. Options include:
- Isotopic labeling: Incorporation of stable isotopes (15N, 13C) at specific amino acid positions, designed for NMR structural biology or metabolic tracing experiments.
- Fluorophore conjugation: Attachment of fluorescent tags such as FITC, TAMRA, or Cy5 for imaging melanocortin receptor distribution in live cells or tissue sections.
- Biotinylation: N‑terminal or site‑specific biotin labeling for affinity purification and surface plasmon resonance (SPR) studies.
- Sequence modifications: Synthesis of truncated, cyclized, or stabilized analogs to explore structure‑function dynamics.
Our scientific consultants collaborate with investigators to design synthesis strategies that align with experimental goals while maintaining purity specifications above 95%.
Packaging and Storage Conditions
PT‑141 is dispensed as a white to off‑white lyophilized powder in sterile, borosilicate glass vials sealed with PTFE‑faced septa and aluminum crimps. Each unit is vacuum‑packed or purged with inert argon to minimize oxidation and moisture ingress during transit. For long‑term preservation, vials should be stored at -20°C or lower, shielded from direct light and humidity. Upon reconstitution, the working solution should be prepared using sterile, endotoxin‑free water or a suitable buffer (e.g., phosphate‑buffered saline, pH 7.4) and used immediately. If aliquoting is required, avoid repeated freeze‑thaw cycles by portioning the reconstituted peptide into single‑use volumes and storing them at -80°C.
Frequently Asked Questions
Is PT-141 suitable for human use?
No. This product is manufactured for laboratory research purposes only. It is not produced under GMP guidelines for active pharmaceutical ingredients and has not been evaluated by regulatory agencies for safety or effectiveness in humans or animals. Any mention of its biological activity refers exclusively to in vitro or preclinical rodent models.
What is the typical lead time for bulk orders?
Standard turnaround for quantities up to 10 grams is 7 to 14 business days after purchase order confirmation, assuming no custom synthesis is required. Larger batches or modified peptides may extend the timeline, and an estimated delivery schedule will be provided during the quotation phase.
How should I handle and store the peptide?
Handle lyophilized PT‑141 powder in a controlled environment, ideally under a laminar flow hood, to maintain sterility. Store unopened vials at -20°C or below in a desiccated container. Once reconstituted, use immediately or aliquot and freeze at -80°C; discard any unused portion after a single use. Avoid exposure to repeated freeze‑thaw cycles, which can compromise peptide integrity.
Are there any restrictions on shipping?
International shipments of research peptides are subject to the import regulations of the destination country. The recipient is responsible for ensuring that they hold the necessary permits or institutional authorizations to receive and use the material. We comply with all applicable export control laws and may require additional documentation before dispatch. Certain jurisdictions classify melanocortin receptor agonists under controlled substance regulations, so please verify local requirements prior to ordering.
Research use only: All products described herein are intended solely for in vitro laboratory experimentation and non‑clinical research. They are not approved for diagnostic, therapeutic, or veterinary applications and must not be used as drugs, food ingredients, or cosmetic components. Statements concerning biological activity are drawn from the peer‑reviewed scientific literature and do not imply any prediction of effects in humans or animals.
For research use only. Not for human or veterinary use.
