Local calcium release in dendritic spines required for long-term synaptic depression.
Neuron
; 28(1): 233-44, 2000 Oct.
Article
em En
| MEDLINE
| ID: mdl-11086997
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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cadeias Pesadas de Miosina
/
Sinalização do Cálcio
/
Miosina Tipo V
/
Dendritos
/
Inibição Neural
Limite:
Animals
Idioma:
En
Revista:
Neuron
Assunto da revista:
NEUROLOGIA
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Japão