Scyliorhinin II is a selective neurokinin-3 receptor agonist, with a Ki of 2.5 nM for neurokinin-3 receptor in rat cerebral cortex.
Scyliorhinin II is a naturally occurring peptide belonging to the tachykinin family, originally isolated from the brain of the dogfish Scyliorhinus canicula. As a neuropeptide, it exhibits a highly conserved sequence motif characteristic of tachykinins and demonstrates significant biological activity in neural and peripheral tissues. Its structural and functional similarity to mammalian tachykinins, such as substance P and neurokinin A, has made it an important tool in comparative neurobiology and peptide signaling research. The study of Scyliorhinin II provides valuable insights into the evolution, receptor specificity, and physiological roles of tachykinin peptides across vertebrate species.
Neuroscience research: In neurobiology, Scyliorhinin II serves as a model ligand for exploring tachykinin receptor interactions and signaling pathways. Researchers utilize this peptide to probe the pharmacological properties of tachykinin receptors in both vertebrate and invertebrate systems, facilitating the characterization of receptor subtypes and their downstream effects. Its ability to mimic or antagonize endogenous tachykinins makes it a valuable reagent for elucidating the mechanisms underlying neurotransmission, neuromodulation, and synaptic plasticity.
Peptide-receptor interaction studies: The peptide is frequently employed to investigate the molecular determinants of peptide-receptor binding specificity. By comparing the activity of Scyliorhinin II with other tachykinins, scientists can dissect the structural features that govern receptor affinity and selectivity. These studies are instrumental in identifying key amino acid residues involved in ligand recognition, informing the rational design of receptor agonists or antagonists for research use.
Comparative physiology: Scyliorhinin II provides a unique perspective for evolutionary and comparative studies of neuropeptide function. Its presence in cartilaginous fish enables researchers to trace the conservation and diversification of tachykinin systems across phylogeny. Investigations using this peptide contribute to a broader understanding of how neuropeptide signaling has adapted to meet the physiological demands of different species, shedding light on the origins and functions of neuropeptide families.
Peptide synthesis and analytical reference: Synthetic Scyliorhinin II is widely used as a reference standard in peptide synthesis protocols and analytical method development. It supports the optimization of solid-phase peptide synthesis, purification strategies, and mass spectrometry-based identification. Access to a well-characterized tachykinin peptide aids in validating analytical workflows, benchmarking experimental conditions, and ensuring reproducibility in peptide research laboratories.
Functional assays and bioactivity testing: In experimental pharmacology, Scyliorhinin II is applied in functional assays to assess the contractile responses of smooth muscle tissues, evaluate receptor-mediated signaling cascades, and quantify bioactivity in various organ systems. Its defined biological actions allow for the calibration of assay sensitivity and specificity, supporting the development of robust in vitro and ex vivo models for tachykinin research. These applications collectively enhance the understanding of peptide function and receptor pharmacology in both basic and applied biosciences.
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