What defines a neuropeptide
Neuropeptides are short peptides that act as signaling molecules in the nervous system, typically through G-protein-coupled receptors. As a research class they span a wide structural range, from tripeptides to longer 20–40 residue sequences.
Classes and receptor targets
The class is broad: bioregulator tripeptides and tetrapeptides (such as Epitalon and Pinealon), synthetic neuroactive sequences (Semax, Selank), sleep-related peptides (DSIP), and endogenous neuropeptides (VIP, Kisspeptin). Each is defined by its sequence and its receptor target, not by a single shared mechanism.
Choosing an in vitro model
Model selection follows the research question: receptor-binding assays for target affinity, neuronal or glial cultures for signaling and viability readouts. The peptide's stability in the chosen medium is a first-order variable, so solubility and handling guidance on the certificate matter.
Documentation for reproducible work
Because neuropeptides are sequence-defined, identity confirmation by mass spectrometry is the foundation of reproducibility. Pair the certificate's identity and purity figures with the lot number so a result can always be traced back to a specific batch.