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• W1992836821 abstract "Excitatory synapses in the brain undergo activity-dependent changes in the strength of synaptic transmission. Such synaptic plasticity as exemplified by long-term potentiation (LTP) is considered a cellular correlate of learning and memory. The presence of G protein-activated inwardly rectifying K + (GIRK) channels near excitatory synapses on dendritic spines suggests their possible involvement in synaptic plasticity. However, whether activity-dependent regulation of GIRK channels affects excitatory synaptic plasticity is unknown. In a companion article we have reported activity-dependent regulation of GIRK channel density in cultured hippocampal neurons that requires activity of NMDA receptors (NMDAR) and protein phosphatase-1 (PP1) and takes place within 15 min. In this study, we performed whole-cell recordings of cultured hippocampal neurons and found that NMDAR activation increases basal GIRK current and GIRK channel activation mediated by adenosine A 1 receptors, but not GABA B receptors. Given the similar involvement of NMDARs, adenosine A 1 receptors, and PP1 in depotentiation of LTP caused by low-frequency stimulation that immediately follows LTP-inducing high-frequency stimulation, we wondered whether NMDAR-induced increase in GIRK channel surface density and current may contribute to the molecular mechanisms underlying this specific depotentiation. Remarkably, GIRK2 null mutation or GIRK channel blockade abolishes depotentiation of LTP, demonstrating that GIRK channels are critical for depotentiation, one form of excitatory synaptic plasticity." @default.
• W1992836821 created "2016-06-24" @default.
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• W1992836821 date "2009-01-13" @default.
• W1992836821 modified "2023-10-01" @default.
• W1992836821 title "G protein-activated inwardly rectifying potassium channels mediate depotentiation of long-term potentiation" @default.
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• W1992836821 doi "https://doi.org/10.1073/pnas.0811685106" @default.
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