Kisspeptin

Kisspeptin Product Overview Kisspeptin refers to a family of KISS1-derived peptides investigated in neuroendocrine and reproductive-signalling research. Nuforme supplies 10mg of lyophilized kisspeptin material in a single vial for controlled laboratory use. Endogenous kisspeptins are produced through processing of the KISS1 precursor protein. The principal forms described in scientific literature include kisspeptin-54, kisspeptin-14, kisspeptin-13 and kisspeptin-10. These forms share a common C-terminal sequence but are different molecular entities. The exact isoform supplied in the Nuforme vial should be confirmed through batch-specific documentation. Product Specifications Product name: Kisspeptin Amount: 10mg Peptide family: KISS1-derived peptides Specific isoform: Verify on batch documentation Sequence: Verify on batch documentation Terminal modifications: Verify on batch documentation Format: Lyophilized material Container: Single vial Endogenous Peptide and Synthetic Research Material Kisspeptins occur naturally as signalling peptides derived from the human KISS1 precursor. The material supplied in a research vial is synthetically manufactured to correspond to a specified kisspeptin sequence; it is not extracted from human tissue. The amount stated on the vial does not identify the peptide isoform. “10mg kisspeptin” describes the quantity of material, whereas “kisspeptin-10” describes a peptide containing ten amino-acid residues. Kisspeptin Isoforms Kisspeptin-54, kisspeptin-14, kisspeptin-13 and kisspeptin-10 share the same biologically relevant C-terminal region but differ in length, molecular mass, degradation behaviour and experimental pharmacokinetics. Kisspeptin-10 is the shortest commonly studied fragment capable of activating the kisspeptin receptor in experimental systems. Kisspeptin-54 and kisspeptin-10 can show similar receptor activity in vitro while behaving differently in biological models. Results obtained with one isoform should not be attributed to another without direct comparative evidence. KISS1R Signalling Research Kisspeptins are endogenous ligands for the kisspeptin receptor, known as KISS1R or GPR54. KISS1R is a G-protein-coupled receptor associated primarily with Gαq/11 signalling. Experimental activation of KISS1R has been studied in relation to phospholipase C activity, inositol trisphosphate and diacylglycerol signalling, intracellular calcium mobilization and protein kinase C pathways. Receptor response depends on the peptide isoform, concentration, exposure pattern, cellular model and species being studied. Hypothalamic and Neuroendocrine Research Kisspeptin signalling has been investigated as an upstream regulator of gonadotropin-releasing hormone, commonly abbreviated GnRH. In neuroendocrine models, GnRH signalling is associated with downstream measurements of luteinizing hormone and follicle-stimulating hormone. Research also examines interactions among kisspeptin, neurokinin B and dynorphin within KNDy-neuron systems. These pathway relationships describe biological research targets. They do not establish that a commercially supplied research vial modifies fertility, puberty, testosterone, estrogen or reproductive function in humans. Human Research Context Controlled human studies have examined defined preparations of kisspeptin-10 or kisspeptin-54 and measured outcomes such as GnRH-associated signalling, luteinizing hormone secretion, follicle-stimulating hormone secretion and reproductive-axis responsiveness. Responses reported in these studies varied with peptide isoform, participant sex, hormonal state, exposure pattern and study design. Continuous and intermittent exposure may also produce different receptor and endocrine responses. Published trials using precisely characterized clinical research preparations do not establish the identity, safety, purity or effectiveness of a commercially supplied research material. Potential Research Areas KISS1R receptor-binding and activation assays Gαq/11 and phospholipase C signalling Intracellular calcium-mobilization studies GnRH-neuron research models Hypothalamic-pituitary-gonadal axis signalling KNDy-neuron pathway research Pulsatile versus continuous receptor exposure KISS1R internalization and desensitization Kisspeptin isoform comparisons Species-specific sequence comparisons Peptide degradation and protease-stability analysis Analytical identity, purity and content testing Reference Identity for Kisspeptin-10 If the batch-specific documentation confirms that the product is human kisspeptin-10, the expected reference identity is: Full name: Human kisspeptin-10 Alternative name: Metastin 45–54 Sequence: Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH2 One-letter sequence: YNWNSFGLRF-NH2 Sequence length: 10 amino acids C-terminal form: Amidated CAS number: 374675-21-5 Molecular formula: C63H83N17O14 Approximate molecular weight: 1302.44 Da PubChem CID: 25240297 These values should not be presented as Nuforme product specifications unless the certificate of analysis confirms kisspeptin-10 with the corresponding sequence and terminal chemistry. Analytical Considerations The certificate of analysis should identify the complete peptide sequence, number of residues, species reference, C-terminal amidation, salt form and expected molecular mass. C-terminal amidation is an important part of the reference kisspeptin-10 structure. A free-acid version is chemically different and has a different calculated mass. Mass spectrometry can support confirmation of molecular identity, while HPLC or UPLC can examine chromatographic purity and related impurities. Quantitative peptide content must be assessed separately because chromatographic purity does not establish that the vial contains 10mg of peptide. Relevant impurities may include truncated sequences, deletion products, incomplete amidation, oxidation, deamidation, residual solvents, counterions, water and aggregates. Researchers should match the certificate to the lot number printed on the vial before relying on any stated sequence, purity or content value. Evidence Limitations Clinical studies involving kisspeptin do not make this product a fertility treatment, hormonal therapy or approved medication. Study results obtained with kisspeptin-10 or kisspeptin-54 cannot be generalized to an unspecified kisspeptin material. This product should not be described as proven to increase fertility, trigger ovulation, raise testosterone, correct hormonal disorders, treat delayed puberty or improve sexual function. Storage and Handling Store the unopened vial according to the conditions stated on the product label and applicable batch documentation. Keep the material sealed and protected from light, heat and moisture. Laboratory preparation, handling and disposal must follow an approved institutional protocol appropriate for the confirmed peptide isoform. For laboratory research only. Not for human consumption or veterinary use. This product is not a drug, medication, supplement or cosmetic and is not intended to diagnose, treat, cure or prevent any disease.