Abstract:
:Phasic activation of the dopamine (DA) midbrain system in response to unexpected reward or novelty is critical for adaptive behavioral strategies. This activation of DA midbrain neurons occurs via a synaptically triggered switch from low-frequency background spiking to transient high-frequency burst firing. We found that, in medial DA neurons of the substantia nigra (SN), activity of ATP-sensitive potassium (K-ATP) channels enabled NMDA-mediated bursting in vitro as well as spontaneous in vivo burst firing in anesthetized mice. Cell-selective silencing of K-ATP channel activity in medial SN DA neurons revealed that their K-ATP channel-gated burst firing was crucial for novelty-dependent exploratory behavior. We also detected a transcriptional upregulation of K-ATP channel and NMDA receptor subunits, as well as high in vivo burst firing, in surviving SN DA neurons from Parkinson's disease patients, suggesting that burst-gating K-ATP channel function in DA neurons affects phenotypes in both disease and health.
journal_name
Nat Neuroscijournal_title
Nature neuroscienceauthors
Schiemann J,Schlaudraff F,Klose V,Bingmer M,Seino S,Magill PJ,Zaghloul KA,Schneider G,Liss B,Roeper Jdoi
10.1038/nn.3185subject
Has Abstractpub_date
2012-09-01 00:00:00pages
1272-80issue
9eissn
1097-6256issn
1546-1726pii
nn.3185journal_volume
15pub_type
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