RT Journal Article
SR Electronic
T1 Dopamine D2-Like Receptors Modulate Intrinsic Properties and Synaptic Transmission of Parvalbumin Interneurons in the Mouse Primary Motor Cortex
JF eneuro
JO eNeuro
FD Society for Neuroscience
SP ENEURO.0081-20.2020
DO 10.1523/ENEURO.0081-20.2020
VO 7
IS 3
A1 Jérémy Cousineau
A1 Léa Lescouzères
A1 Anne Taupignon
A1 Lorena Delgado-Zabalza
A1 Emmanuel Valjent
A1 Jérôme Baufreton
A1 Morgane Le Bon-Jégo
YR 2020
UL http://www.eneuro.org/content/7/3/ENEURO.0081-20.2020.abstract
AB Dopamine (DA) plays a crucial role in the control of motor and higher cognitive functions such as learning, working memory, and decision making. The primary motor cortex (M1), which is essential for motor control and the acquisition of motor skills, receives dopaminergic inputs in its superficial and deep layers from the midbrain. However, the precise action of DA and DA receptor subtypes on the cortical microcircuits of M1 remains poorly understood. The aim of this work was to investigate in mice how DA, through the activation of D2-like receptors (D2Rs), modulates the cellular and synaptic activity of M1 parvalbumin-expressing interneurons (PVINs) which are crucial to regulate the spike output of pyramidal neurons (PNs). By combining immunofluorescence, ex vivo electrophysiology, pharmacology and optogenetics approaches, we show that D2R activation increases neuronal excitability of PVINs and GABAergic synaptic transmission between PVINs and PNs in Layer V of M1. Our data reveal how cortical DA modulates M1 microcircuitry, which could be important in the acquisition of motor skills.