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Firing modes of dopamine neurons drive bidirectional GIRK channel plasticity

Lalive, Arnaud L. and Munoz, Michaelanne B. and Bellone, Camilla and Slesinger, Paul A. and Lüscher, Christian and Tan, Kelly R.. (2014) Firing modes of dopamine neurons drive bidirectional GIRK channel plasticity. Journal of Neuroscience, 34 (15). pp. 5107-5114.

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Official URL: http://edoc.unibas.ch/50643/

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Abstract

G-protein-coupled inwardly rectifying potassium (GIRK) channels contribute to the resting membrane potential of many neurons, including dopamine (DA) neurons in the ventral tegmental area (VTA). VTA DA neurons are bistable, firing in two modes: one characterized by bursts of action potentials, the other by tonic firing at a lower frequency. Here we provide evidence that these firing modes drive bidirectional plasticity of GIRK channel-mediated currents. In acute midbrain slices of mice, we observed that in vitro burst activation of VTA DA neurons potentiated GIRK currents whereas tonic firing depressed these currents. This plasticity was not specific to the metabotropic receptor activating the GIRK channels, as direct activation of GIRK channels by nonhydrolyzable GTP also potentiated the currents. The plasticity of GIRK currents required NMDA receptor and CaMKII activation, and involved protein trafficking through specific PDZ domains of GIRK2c and GIRK3 subunit isoforms. Prolonged tonic firing may thus enhance the probability to switch into burst-firing mode, which then potentiates GIRK currents and favors the return to baseline. In conclusion, activity-dependent GIRK channel plasticity may represent a slow destabilization process favoring the switch between the two firing modes of VTA DA neurons.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Neurobiology > Physiopathology of basal ganglia neuronal subcircuits (Tan)
UniBasel Contributors:Tan, Kelly
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Society for Neuroscience
ISSN:0270-6474
e-ISSN:1529-2401
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:04 Dec 2017 08:10
Deposited On:04 Dec 2017 08:10

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