Persephin (PSPN) is a neurotrophic growth factor that promotes survival and differentiation of dopaminergic and motor neurons by binding to its coreceptor GFRA4 and activating the RET receptor signaling pathway [UniProt Function]. Beyond the nervous system, PSPN participates in kidney development, where it acts as a ramogen promoting branching morphogenesis of the ureteric bud-derived collecting duct system 1. Recent evidence suggests PSPN contributes to pain pathogenesis in osteosarcoma, with higher expression in endothelial cells within tumor tissue 2, and may be upregulated in intervertebral disc degeneration associated with discogenic pain 3. In the context of intracerebral hemorrhage, PSPN expression increases as part of a neuroprotective response, with systemic elevation of persephin correlating with improved outcomes when Homer1 and MEK inhibitors were administered 4. The gene's expression across diverse cell types and its involvement in multiple tissue systems reflect its broad neurotrophic and developmental roles, though clinical therapeutic applications remain investigational.