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Yerna, Xavier; Schakman, Olivier; Ratbi, Ikram; Kreis, Anna; Lepannetier, Sophie; de Clippele, Marie; Achouri, Younès; Tajeddine, Nicolas; Tissir, Fadel; Gualdani, Roberta; Gailly, Philippe
International journal of molecular sciences, 03/2020, Letnik: 21, Številka: 5Journal Article
Group I metabotropic glutamate receptors (mGluR) are involved in various forms of synaptic plasticity that are believed to underlie declarative memory. We previously showed that mGluR5 specifically activates channels containing TRPC1, an isoform of the canonical family of Transient Receptor Potential channels highly expressed in the CA1-3 regions of the hippocampus. Using a tamoxifen-inducible conditional knockout model, we show here that the acute deletion of the gene alters the extinction of spatial reference memory. mGluR-induced long-term depression, which is partially responsible for memory extinction, was impaired in these mice. Similar results were obtained in vitro and in vivo by inhibiting the channel by its most specific inhibitor, Pico145. Among the numerous known postsynaptic pathways activated by type I mGluR, we observed that the deletion of impaired the activation of ERK1/2 and the subsequent expression of Arc, an immediate early gene that plays a key role in AMPA receptors endocytosis and subsequent long-term depression.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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