期刊
NEUROPHARMACOLOGY
卷 118, 期 -, 页码 209-222出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropharm.2017.03.017
关键词
M-1 muscarinic receptor; Striatal MSNs; Intrinsic plasticity; AP-EPSP coupling; Dorsolateral striatum-dependent learning
资金
- National Institutes of Health [2RO1MH082867, RO1MH073676, P50NS071669, RO1NS065867]
The dorsolateral striatum is critically involved in movement control and motor learning. Striatal function is regulated by a variety of neuromodulators including acetylcholine. Previous studies have shown that cholinergic activation excites striatal principal projection neurons, medium spiny neurons (MSNs), and this action is mediated by muscarinic acetylcholine subtype 1 receptors (M-1) through modulating multiple potassium channels. In the present study, we used electrophysiology techniques in conjunction with optogenetic and pharmacological tools to determine the long-term effects of striatal cholinergic activation on MSN intrinsic excitability. A transient increase in acetylcholine release in the striatum by optogenetic stimulation resulted in a long-lasting increase in excitability of MSNs, which was associated with hyperpolarizing shift of action potential threshold and decrease in afterhyperpolarization (AHP) amplitude, leading to an increase in probability of EPSP-action potential coupling. The M-1 selective antagonist VU0255035 prevented, while the M-1 selective positive allosteric modulator (PAM) VU0453595 potentiated the cholinergic activation-induced persistent increase in MSN intrinsic excitability, suggesting that M-1 receptors are critically involved in the induction of this long-lasting response. This M-1 receptor-dependent long-lasting change in MSN intrinsic excitability could have significant impact on striatal processing and might provide a novel mechanism underlying cholinergic regulation of the striatum-dependent motor learning and cognitive function. Consistent with this, behavioral studies indicate that potentiation of M-1 receptor signaling by VU0453595 enhanced performance of mice in cue dependent water-based T-maze, a dorsolateral striatum-dependent learning task. (C) 2017 Published by Elsevier Ltd.
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