title: Local calcium release in dendritic spines required for long-term synaptic depression.
abstract: We have used rats and mice with mutations in myosin-Va to evaluate the range and function of IP3-mediated Ca2+ signaling in dendritic spines. In these mutants, the endoplasmic reticulum and its attendant IP3 receptors do not enter the postsynaptic spines of parallel fiber synapses on cerebellar Purkinje cells. Long-term synaptic depression (LTD) is absent at the parallel fiber synapses of the mutants, even though the structure and function of these synapses otherwise appear normal. This loss of LTD is associated with selective changes in IP3-mediated Ca2+ signaling in spines and can be rescued by photolysis of a caged Ca2+ compound. Our results reveal that IP3 must release Ca2+ locally in the dendritic spines to produce LTD and indicate that one function of dendritic spines is to target IP3-mediated Ca2+ release to the proper subcellular domain.
authors.affiliation: Laboratory for Cellular Neurophysiology, Brain Science Institute, RIKEN, Saitama, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Miyata
authors.forename: E A
authors.initials: EA
authors.lastname: Finch
authors.forename: L
authors.initials: L
authors.lastname: Khiroug
authors.forename: K
authors.initials: K
authors.lastname: Hashimoto
authors.forename: S
authors.initials: S
authors.lastname: Hayasaka
authors.forename: S I
authors.initials: SI
authors.lastname: Oda
authors.forename: M
authors.initials: M
authors.lastname: Inouye
authors.forename: Y
authors.initials: Y
authors.lastname: Takagishi
authors.forename: G J
authors.initials: GJ
authors.lastname: Augustine
authors.forename: M
authors.initials: M
authors.lastname: Kano
mesh_terms: D015763:2-Amino-5-phosphonovalerate / Q000494:pharmacology; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000818:Animals; D001565:Benzoates / Q000494:pharmacology; D015220:Calcium Channels / Q000172:deficiency / Q000378:metabolism; D020013:Calcium Signaling / Q000502:physiology*; D002531:Cerebellum / Q000166:cytology / Q000378:metabolism; D003712:Dendrites / Q000378:metabolism* / Q000648:ultrastructure; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D005998:Glycine / Q000031:analogs & derivatives / Q000494:pharmacology; D066298:In Vitro Techniques; D053496:Inositol 1,4,5-Trisphosphate Receptors; D007381:Intermediate Filament Proteins / Q000172:deficiency / Q000235:genetics; D051379:Mice; D008818:Mice, Neurologic Mutants; D018995:Myosin Heavy Chains; D024701:Myosin Type V; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology*; D018408:Patch-Clamp Techniques; D011689:Purkinje Cells / Q000378:metabolism / Q000648:ultrastructure; D051381:Rats; D011922:Rats, Mutant Strains; D018160:Receptors, Cytoplasmic and Nuclear / Q000172:deficiency / Q000378:metabolism; D009435:Synaptic Transmission / Q000235:genetics; D013995:Time
chemical_list: D001565:Benzoates; D015220:Calcium Channels; D018691:Excitatory Amino Acid Antagonists; C506926:ITPR1 protein, human; D053496:Inositol 1,4,5-Trisphosphate Receptors; D007381:Intermediate Filament Proteins; C513082:Myo5a protein, mouse; C513081:Myo5a protein, rat; D018160:Receptors, Cytoplasmic and Nuclear; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; C079693:4-carboxyphenylglycine; D015763:2-Amino-5-phosphonovalerate; D024701:Myosin Type V; D018995:Myosin Heavy Chains; D005998:Glycine