RT Journal Article
SR Electronic
T1 Serotonergic Suppression of Mouse Prefrontal Circuits Implicated in Task Attention
JF eneuro
JO eNeuro
FD Society for Neuroscience
SP ENEURO.0269-16.2016
DO 10.1523/ENEURO.0269-16.2016
VO 3
IS 5
A1 Michael K. Tian
A1 Eric F. Schmidt
A1 Evelyn K. Lambe
YR 2016
UL http://www.eneuro.org/content/3/5/ENEURO.0269-16.2016.abstract
AB Serotonin (5-HT) regulates attention by neurobiological mechanisms that are not well understood. Layer 6 (L6) pyramidal neurons of prefrontal cortex play an important role in attention and express 5-HT receptors, but the serotonergic modulation of this layer and its excitatory output is not known. Here, we performed whole-cell recordings and pharmacological manipulations in acute brain slices from wild-type and transgenic mice expressing either eGFP or eGFP-channelrhodopsin in prefrontal L6 pyramidal neurons. Excitatory circuits between L6 pyramidal neurons and L5 GABAergic interneurons, including a population of interneurons essential for task attention, were investigated using optogenetic techniques. Our experiments show that prefrontal L6 pyramidal neurons are subject to strong serotonergic inhibition and demonstrate direct 5-HT–sensitive connections between prefrontal L6 pyramidal neurons and two classes of L5 interneurons. This work helps to build a neurobiological framework to appreciate serotonergic disruption of task attention and yields insight into the disruptions of attention observed in psychiatric disorders with altered 5-HT receptors and signaling.