Cholinergic Projections to the Substantia Nigra Pars Reticulata Inhibit Dopamine Modulation of Basal Ganglia through the M Muscarinic Receptor.

Moehle MS, Pancani T, Byun N, Yohn SE, Wilson GH, Dickerson JW, Remke DH, Xiang Z, Niswender CM, Wess J, Jones CK, Lindsley CW, Rook JM, Conn PJ
Neuron. 2017 96 (6): 1358-1372.e4

PMID: 29268098 · PMCID: PMC5753765 · DOI:10.1016/j.neuron.2017.12.008

Cholinergic regulation of dopaminergic inputs into the striatum is critical for normal basal ganglia (BG) function. This regulation of BG function is thought to be primarily mediated by acetylcholine released from cholinergic interneurons (ChIs) acting locally in the striatum. We now report a combination of pharmacological, electrophysiological, optogenetic, chemogenetic, and functional magnetic resonance imaging studies suggesting extra-striatal cholinergic projections from the pedunculopontine nucleus to the substantia nigra pars reticulata (SNr) act on muscarinic acetylcholine receptor subtype 4 (M) to oppose cAMP-dependent dopamine receptor subtype 1 (D) signaling in presynaptic terminals of direct pathway striatal spiny projections neurons. This induces a tonic inhibition of transmission at direct pathway synapses and D-mediated activation of motor activity. These studies provide important new insights into the unique role of M in regulating BG function and challenge the prevailing hypothesis of the centrality of striatal ChIs in opposing dopamine regulation of BG output.

Copyright © 2017 Elsevier Inc. All rights reserved.

MeSH Terms (20)

Acetylcholine Animals Basal Ganglia Channelrhodopsins Choline O-Acetyltransferase Cholinergic Agents Cholinergic Neurons Dopamine Inhibitory Postsynaptic Potentials Locomotion Mice Mice, Inbred C57BL Mice, Transgenic Neurotransmitter Agents Oxygen Pars Reticulata Pedunculopontine Tegmental Nucleus Receptor, Muscarinic M4 Receptors, Dopamine D1 Signal Transduction

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