GABAB receptors modulate NMDA receptor calcium signals in dendritic spines.
GABAB receptors modulate NMDA receptor calcium signals in dendritic spines.
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DOI:
10.1016/j.neuron.2010.03.012
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发表时间:
2010-04-15
期刊:
影响因子:
16.2
通讯作者:
Carter AG
中科院分区:
文献类型:
--
作者:
Chalifoux JR;Carter AG
Metabotropic GABAB receptors play a fundamental role in modulating the excitability of neurons and circuits throughout the brain. These receptors influence synaptic transmission by inhibiting presynaptic release or activating postsynaptic potassium channels. However, their ability to directly influence different types of postsynaptic glutamate receptors remains unresolved. Here we examine GABAB receptor modulation in layer 2/3 pyramidal neurons from the mouse prefrontal cortex. We use two-photon laser-scanning microscopy to study synaptic modulation at individual dendritic spines. Using two-photon optical quantal analysis, we first demonstrate robust presynaptic modulation of multivesicular release at single synapses. Using two-photon glutamate uncaging, we then reveal that GABAB receptors strongly inhibit NMDA receptor calcium signals. This postsynaptic modulation occurs via the PKA pathway and does not affect synaptic currents mediated by AMPA or NMDA receptors. This novel form of GABAB receptor modulation has widespread implications for the control of calcium-dependent neuronal function.
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