期刊
JOURNAL OF NEUROSCIENCE
卷 28, 期 10, 页码 2633-2641出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.5079-07.2008
关键词
dopamine; D(1); electrical coupling; neocortex; FS interneurons; IPSPs
资金
- NEI NIH HHS [R01 EY009120, R01 EY012114, EY12114] Funding Source: Medline
Dopamine, acting through D(1) receptors, is thought to play an important role in cognitive functions of the frontal cortex such as working memory. D(1) receptors are widely expressed in fast-spiking (FS) interneurons, a prominent class of inhibitory cells that exert a powerful control of neuronal firing through proximal synapses on their postsynaptic targets. FS cells are extensively mutually interconnected by both GABA(A) receptor-mediated synapses and gap junction-mediated electrical synapses, and networks of FS cells play a crucial role in the generation of rhythmic synchronous activity. Although recent studies have documented the effects of dopamine modulation of neocortical synaptic connections among excitatory cells and between excitatory and various inhibitory cells, the effects of dopamine receptor activation on GABAergic and electrical interactions among FS cells is not known. To resolve this, we recorded from pairs of FS cells in the infragranular layers of mouse neocortical slices and tested the effects of D(1)-like (D(1)/D(5)) receptor activation on these connections. We found that D(1)-like receptor activation modulated GABAergic but not electrical connections between them. A D(1)- like receptor agonist preserved the strength of electrical coupling but reduced the amplitude of IPSPs and IPSCs between FS cells. Our results suggest that D(1)-like receptor activation has synapse-specific effects within networks of FS cells, with potential implications for the generation of rhythmic activity in the neocortex.
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