Journal
NEUROSCIENCE LETTERS
Volume 341, Issue 1, Pages 57-60Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/S0304-3940(03)00133-2
Keywords
high frequency stimulation; deep brain stimulation; gamma-aminobutyric acid(A) receptors; caudate nucleus; dopamine
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High frequency stimulation (HFS) of deep brain regions such as globus pallidus internus or subthalamic nucleus can reverse Parkinson's symptoms probably through activation of gamma-aminobutyric acid (GABA)ergic neurotransmission. To prove the hypothesis, rat striatal slices were stimulated electrically (130 Hz) in vitro and dopamine (DA) outflow was measured using high performance liquid chromatography. HFS induced an attenuation in basal DA release in perfusate. Veratridine-induced DA outflow was blocked by the simultaneous application of HFS. Addition of bicuculline, a GABA(A) receptor antagonist, reversed the effect of HFS on DA outflow. In addition, destruction of striatal GABAergic neurons with kainic acid also reversed the effect of HFS. In conclusion, our present data provide strong evidence that HFS does not only need presynaptic GABA(A) receptors but also intact GABAergic nerve terminals coupled to GABA(A) receptors to exert an inhibitory effect and give a rationale of HFS effectiveness in the treatment of Parkinson's disease. (C) 2003 Elsevier Science Ireland Ltd. All rights reserved.
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