LRP8

LRP8 (ApoER2) is a member of the low-density lipoprotein receptor family that is predominantly expressed in the brain and functions as a receptor for extracellular ligands involved in neuronal signaling and synaptic regulation^[1]. Mechanistically, LRP8 acts as a principal receptor for Reelin and transduces Reelin-dependent signals through recruitment of the intracellular adaptor DAB1, thereby regulating neuronal migration, cortical organization, synaptic plasticity, and long-term neuronal function^[2][3]. Activation of the Reelin-LRP8 signaling pathway influences downstream kinase networks and contributes to the maintenance of neuronal connectivity and excitability, making this pathway a central component of neurodevelopmental and synaptic homeostasis processes^[2][4]. In disease contexts, altered LRP8 signaling and aberrant alternative splicing have been associated with Alzheimer’s disease, and reduced abundance of signaling-competent LRP8 isoforms has been reported in human and mouse disease models^[5]. Restoration of disease-associated LRP8 splicing defects using antisense oligonucleotide approaches improved learning performance in Alzheimer’s disease mouse models, supporting the utility of LRP8 as an experimental target for mechanistic and translational studies^[5]. Compared with the closely related VLDLR isoform, LRP8 exhibits distinct receptor trafficking, signaling properties, and alternative splicing patterns, which contribute to nonredundant biological functions despite shared participation in Reelin signaling^[2][6]. For experimental applications, soluble ApoER2 fragments can function as dominant-negative inhibitors of Reelin signaling and have been used to investigate pathway-specific mechanisms in cellular and developmental models^[6].