Prion protein-metabotropic glutamate receptor 5 complex (PrPC-mGluR5 complex)

The Prion protein-metabotropic glutamate receptor 5 (PrPC-mGluR5) complex is a specialized dual neuronal cell-surface assembly that serves as a high-affinity scaffold for amyloid-beta (Aβ) oligomers and alpha-synuclein. In healthy neurons, these components contribute to synaptic maintenance; however, in neurodegenerative conditions like Alzheimer's disease, the binding of toxic protein aggregates to PrPC triggers the overactivation of mGluR5. This pathological signaling leads to intracellular calcium dysregulation, Fyn kinase activation, and subsequent synaptic loss and cognitive decline. Therapeutic strategies targeting this complex focus on using silent allosteric modulators (SAMs) or decoy receptors to block the toxic signaling cascade while preserving the essential physiological role of glutamate in the brain. By specifically disrupting the interaction between the protein aggregates and the receptor complex, researchers aim to halt the progression of neurodegeneration and restore synaptic plasticity.

Other names

Cellular prion protein-mGluR5 complexPrPC-mGluR5 signaling complexAmyloid-beta oligomer receptor complexPrP-mGluR5 assembly

Small molecule silent allosteric modulators (SAMs) or specific ligands bind to the complex to disrupt the pathological interaction between amyloid-beta oligomers and the receptor assembly, thereby preventing downstream synaptotoxic signaling without interfering with normal glutamate neurotransmission.