植田 禎史
   Department   School of Medicine, School of Medicine
   Position   Assistant Professor
Article types Original article
Language English
Peer review Peer reviewed
Title Dopamine induces a slow afterdepolarization in lateral amygdala neurons.
Journal Formal name:Journal of Neurophysiology
Abbreviation:J Neurophysiol
ISSN code:0022-3077(Print)0022-3077(Linking)
Volume, Issue, Page 98(2),984-992頁
Author and coauthor Yamamoto Ryo†, Ueta Yoshifumi, Kato Nobuo*
Publication date 2007/08
Summary The amygdala and dopaminergic innervation thereunto are considered to cooperatively regulate emotional states and behaviors. The present experiments examined effects of dopamine on lateral amygdala (LA) neuron excitability by whole cell recordings. Bath application of dopamine induced slow afterdepolarization (sADP). This sADP lasted for>5 s, and its magnitude varied in a concentration-dependent manner. Co-application of the D1 receptor antagonist SKF83566 reduced its amplitude. The D1 receptor agonist SKF38393, applied alone, induced sADP of a smaller amplitude. Induction of the full sADP required 5-HT(2) and noradrenalin alpha(1) receptor activation as well. D2 receptor activation or blockade did not affect sADP induction. The calcium channel blocker cadmium or intracellular calcium chelator bis-(o-aminophenoxy)-N,N,N',N' tetraacetic acid (BAPTA) blocked induction of the sADP, which was suggested to be triggered by calcium influx. Under voltage clamp, membrane conductance decreased at the peak of sADP current (I(sADP)). I(sADP) was suppressed by cesium included in pipettes. The I-V curve of the net I(sADP) was shifted as the external concentration of potassium was raised, and the reversal potential was identical to that of potassium, suggesting that dopamine decreases potassium conductance to induce the sADP. The present sADP may serve asa positive-feedback regulator of excitability in LA neurons.
DOI 10.1152/jn.00204.2007
Document No. 17553953
PMID 17553953