TrkC

TrkC (NTRK3) is a receptor tyrosine kinase that functions as a high-affinity receptor for neurotrophin-3 (NT-3) and supports neurotrophin-dependent signaling in neural contexts^[1]. Mechanistically, TrkC signaling connects ligand recognition to receptor activation and downstream biological responses, while developmental studies show broad expression in the developing nervous system and selected non-neuronal tissues^[2]. In synapse models, postsynaptic TrkC interacts with presynaptic PTPσ to generate bidirectional adhesion and recruitment that are essential for excitatory synapse development^[3]. In genetic mouse models, disruption of TrkC eliminates Ia muscle afferent projections, reduces large myelinated axons, and produces abnormal movement and posture, linking NT-3/TrkC signaling to proprioceptive circuit formation^[4]. Compared with related Trk isoforms, TrkC shows key ligand and splice-isoform distinctions: TrkC is identified as an NT-3 receptor, and alternative TrkC isoforms display distinct biological properties and substrate specificities^[1][5]. Kinase-insert TrkC isoforms show impaired signaling responses, emphasizing isoform selection as a critical experimental variable^[6]. For research applications, selective TrkC peptidomimetics can function as agonistic ligands, while NT-3-derived peptidomimetics can antagonize TrkC activation and signaling^[7][8].