title: Epilepsy-related ligand/receptor complex LGI1 and ADAM22 regulate synaptic transmission.
abstract: Abnormally synchronized synaptic transmission in the brain causes epilepsy. Most inherited forms of epilepsy result from mutations in ion channels. However, one form of epilepsy, autosomal dominant partial epilepsy with auditory features (ADPEAF), is characterized by mutations in a secreted neuronal protein, LGI1. We show that ADAM22, a transmembrane protein that when mutated itself causes seizure, serves as a receptor for LGI1. LGI1 enhances AMPA receptor-mediated synaptic transmission in hippocampal slices. The mutated form of LGI1 fails to bind to ADAM22. ADAM22 is anchored to the postsynaptic density by cytoskeletal scaffolds containing stargazin. These studies in rat brain indicate possible avenues for understanding human epilepsy.
authors.affiliation: Laboratory of Genomics and Proteomics, National Institute for Longevity Sciences, National Center for Geriatrics and Gerontology, Obu, Aichi 474-8522, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Fukata
authors.forename: Hillel
authors.initials: H
authors.lastname: Adesnik
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Iwanaga
authors.forename: David S
authors.initials: DS
authors.lastname: Bredt
authors.forename: Roger A
authors.initials: RA
authors.lastname: Nicoll
authors.forename: Masaki
authors.initials: M
authors.lastname: Fukata
mesh_terms: D051722:ADAM Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D015220:Calcium Channels / Q000378:metabolism; D002460:Cell Line; D002525:Cerebellar Cortex / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism; D000076122:Disks Large Homolog 4 Protein; D004828:Epilepsies, Partial / Q000503:physiopathology; D006624:Hippocampus / Q000378:metabolism / Q000502:physiology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D008024:Ligands; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D016202:N-Methylaspartate / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000378:metabolism*; D051381:Rats; D018091:Receptors, AMPA / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D013569:Synapses / Q000378:metabolism; D009435:Synaptic Transmission; D014162:Transfection; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid / Q000378:metabolism
chemical_list: C491911:Cacng2 protein, rat; D015220:Calcium Channels; D000076122:Disks Large Homolog 4 Protein; C501449:Dlg4 protein, rat; D036341:Intercellular Signaling Peptides and Proteins; D047908:Intracellular Signaling Peptides and Proteins; C513865:Lgi1 protein, rat; D008024:Ligands; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D011506:Proteins; D018091:Receptors, AMPA; D011993:Recombinant Fusion Proteins; D016202:N-Methylaspartate; D018350:alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; C513864:Adam22 protein, rat; D051722:ADAM Proteins; C121258:Adam22 protein, mouse