mGluR long-term depression regulates GluA2 association with COPII vesicles and exit from the endoplasmic reticulum.
EMBO J
; 36(2): 232-244, 2017 01 17.
Article
em En
| MEDLINE
| ID: mdl-27856517
ABSTRACT
mGluR long-term depression (mGluR-LTD) is a form of synaptic plasticity induced at excitatory synapses by metabotropic glutamate receptors (mGluRs). mGluR-LTD reduces synaptic strength and is relevant to learning and memory, autism, and sensitization to cocaine; however, the mechanism is not known. Here we show that activation of Group I mGluRs in medium spiny neurons induces trafficking of GluA2 from the endoplasmic reticulum (ER) to the synapse by enhancing GluA2 binding to essential COPII vesicle proteins, Sec23 and Sec13. GluA2 exit from the ER further depends on IP3 and Ryanodine receptor-controlled Ca2+ release as well as active translation. Synaptic insertion of GluA2 is coupled to removal of high-conducting Ca2+-permeable AMPA receptors from synapses, resulting in synaptic depression. This work demonstrates a novel mechanism in which mGluR signals release AMPA receptors rapidly from the ER and couple ER release to GluA2 synaptic insertion and GluA1 removal.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Receptores de Glutamato Metabotrópico
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Receptores de AMPA
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Proteínas de Transporte Vesicular
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Retículo Endoplasmático
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Neurônios
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article