Journal
NEURON
Volume 105, Issue 6, Pages 1036-+Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2019.12.026
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Funding
- NIH-NIDA [1F30DA042510-01, R01DA048822]
- IdEx University of Bordeaux Investments for the Future program (France)
- NIH-NINDS [R01NS097312]
- INSERM [ERC-2017-AdG-786467]
- European Research Council (MiCaBra) [ERC-2017-AdG-786467]
- Human Frontier Science Program [RGP0036/2014]
- Salvador de Madariaga Program (Spain)
- ANR JCJC (mitoCB1-fat)
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Dopamine is involved in physiological processes like learning and memory, motor control and reward, and pathological conditions such as Parkinson's disease and addiction. In contrast to the extensive studies on neurons, astrocyte involvement in dopaminergic signaling remains largely unknown. Using transgenic mice, optogenetics, and pharmacogenetics, we studied the role of astrocytes on the dopaminergic system. We show that in freely behaving mice, astro-cytes in the nucleus accumbens (NAc), a key reward center in the brain, respond with Ca2+ elevations to synaptically released dopamine, a phenomenon enhanced by amphetamine. In brain slices, synaptically released dopamine increases astrocyte Ca2+, stimulates ATP/adenosine release, and depresses excitatory synaptic transmission through activation of presynaptic A(1) receptors. Amphetamine de-presses neurotransmission through stimulation of astrocytes and the consequent A(1) receptor activation. Furthermore, astrocytes modulate the acute behavioral psychomotor effects of amphetamine. Therefore, astrocytes mediate the dopamine- and amphetamine-induced synaptic regulation, revealing a novel cellular pathway in the brain reward system.
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