Cornichons control ER export of AMPA receptors to regulate synaptic excitability.
Cornichons control ER export of AMPA receptors to regulate synaptic excitability.
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DOI:
10.1016/j.neuron.2013.07.028
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发表时间:
2013-10-02
期刊:
影响因子:
16.2
通讯作者:
Maricq AV
中科院分区:
文献类型:
--
作者:
Brockie PJ;Jensen M;Mellem JE;Jensen E;Yamasaki T;Wang R;Maxfield D;Thacker C;Hoerndli F;Dunn PJ;Tomita S;Madsen DM;Maricq AV
The strength of synaptic communication at central synapses depends on the number of ionotropic glutamate receptors, particularly the class gated by the agonist AMPA (AMPARs). Cornichon proteins, evolutionarily conserved endoplasmic reticulum cargo adaptors, modify the properties of vertebrate AMPARs when coexpressed in heterologous cells. However, the contribution of cornichons to behavior and in vivo nervous system function has yet to be determined. Here, we take a genetic approach to these questions by studying CNI-1 – the sole cornichon homologue in C. elegans. cni-1 mutants hyper-reverse, a phenotype associated with increased glutamatergic synaptic transmission. Consistent with this behavior, we find larger glutamate-gated currents in cni-1 mutants with a corresponding increase in AMPAR number. Furthermore, we observe opposite phenotypes in transgenic worms that overexpress CNI-1 or vertebrate homologues. In reconstitution studies, we provide support for an evolutionarily conserved role for cornichons in regulating the export of vertebrate and invertebrate AMPARs.
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