Electric fields due to synaptic currents sharpen excitatory transmission.
Electric fields due to synaptic currents sharpen excitatory transmission.
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DOI:
10.1126/science.1154330
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发表时间:
2008-03-28
期刊:
影响因子:
--
通讯作者:
Rusakov DA
中科院分区:
文献类型:
--
作者:
Sylantyev S;Savtchenko LP;Niu YP;Ivanov AI;Jensen TP;Kullmann DM;Xiao MY;Rusakov DA
The synaptic response waveform, which determines signal integration properties in the brain, depends on the spatiotemporal profile of neurotransmitter in the synaptic cleft. Here, we show that electrophoretic interactions between AMPA-receptor-mediated excitatory currents and negatively charged glutamate molecules accelerate the clearance of glutamate from the synaptic cleft, speeding-up synaptic responses. This phenomenon is reversed upon depolarization and diminished when intra-cleft electric fields are weakened through a decrease in the AMPA receptor density. In contrast, the kinetics of receptor-mediated currents evoked by direct application of glutamate are voltage-independent, as are synaptic currents mediated by the electrically neutral neurotransmitter GABA. Voltage-dependent temporal tuning of excitatory synaptic responses may thus contribute to signal integration in neural circuits.
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