PE-22-28 is a synthetic heptapeptide consisting of the amino acid sequence Gly-Val-Ser-Trp-Gly-Leu-Arg (GVSWGLR). It is derived from spadin, a larger peptide fragment generated from the sortilin precursor protein. Due to its reduced size while retaining key biological activity observed in experimental models, PE-22-28 has attracted interest as a research tool for investigating neuroregulatory signaling pathways. In laboratory settings, it is commonly classified as a TREK-1 research peptide and is utilized to study ion channel–mediated cellular communication.
Mechanistically, PE-22-28 has been investigated for its interaction with TREK-1 (TWIK-related potassium channel-1), a two-pore domain potassium channel involved in regulating membrane potential and neuronal excitability. Experimental studies suggest that modulation of TREK-1 activity can influence intracellular signaling cascades associated with neuroplasticity and cellular adaptation. Because TREK-1 is expressed in both neuronal and non-neuronal tissues, PE-22-28 serves as a useful probe for examining how ion channel regulation affects broader physiological signaling networks.
In vitro and preclinical research applications commonly include electrophysiological studies, ion channel activity assays, and analysis of gene expression changes associated with neuronal signaling pathways. Investigators may employ PE-22-28 in cultured neuronal systems or animal models to evaluate cellular responses to TREK-1 modulation, including alterations in membrane conductance, signal transduction pathways, and neurotrophic factor expression. Its relatively small size and defined amino acid sequence allow for reproducible synthesis and controlled experimental dosing.
Overall, PE-22-28 is regarded as a research-grade peptide fragment used to investigate TREK-1 channel biology and associated neuroregulatory mechanisms. Its origin as an active spadin-derived fragment and its targeted interaction profile make it a valuable tool for laboratory studies focused on ion channel function, neuronal signaling, and peptide-mediated cellular regulation. It is intended strictly for research use in regulated laboratory environments.
