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• W2000965799 abstract "Synaptic long-term potentiation is maintained through gene transcription, but how the nucleus is recruited remains controversial. Activation of extracellular signal-regulated kinases (ERKs) 1 and 2 with synaptic stimulation has been shown to require NMDA receptors (NMDARs), yet stimulation intensities sufficient to recruit action potentials (APs) also appear to be required. This has led us to ask the question of whether NMDARs are necessary for AP generation as they relate to ERK activation. To test this, we examined the effects of NMDAR blockade on APs induced with synaptic stimulation using whole-cell current-clamp recordings from CA1 pyramidal cells in hippocampal slices. NMDAR antagonists were found to potently inhibit APs generated with 5 and 100 Hz synaptic stimulation. Blockade of APs and ERK activation could be overcome with the addition of the GABA A antagonist bicuculline, indicating that APs are sufficient to activate signals such as ERK in the nucleus and throughout the neuron in the continued presence of NMDAR antagonists. Interestingly, no effects of the NMDAR antagonists were observed when theta-burst stimulation (TBS) was used. This resistance to the antagonists is conferred by temporal summation during the bursts. These results clarify findings from a previous study showing that ERK activation induced with TBS is resistant to 2-amino-5-phosphonovalerate, in contrast to that induced with 5 or 100 Hz stimulation, which is sensitive. By showing that NMDAR blockade inhibits AP generation, we demonstrate that a major role that NMDARs play in cell-wide and nuclear ERK activation is through their contribution to action potential generation." @default.
• W2000965799 created "2016-06-24" @default.
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• W2000965799 date "2005-07-27" @default.
• W2000965799 modified "2023-09-28" @default.
• W2000965799 title "Pattern-Dependent Role of NMDA Receptors in Action Potential Generation: Consequences on Extracellular Signal-Regulated Kinase Activation" @default.
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• W2000965799 doi "https://doi.org/10.1523/jneurosci.1579-05.2005" @default.
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