Influence of the frequency parameter on extracellular glutamate and γ‐aminobutyric acid in substantia nigra and globus pallidus during electrical stimulation of subthalamic nucleus in rats
Identifieur interne : 000C89 ( Istex/Checkpoint ); précédent : 000C88; suivant : 000C90Influence of the frequency parameter on extracellular glutamate and γ‐aminobutyric acid in substantia nigra and globus pallidus during electrical stimulation of subthalamic nucleus in rats
Auteurs : François Windels [France, États-Unis] ; Nicolas Bruet [France] ; Annie Poupard [France] ; Claude Feuerstein [France] ; Anne Bertrand [France] ; Marc Savasta [France]Source :
- Journal of Neuroscience Research [ 0360-4012 ] ; 2003-04-15.
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Abstract
High‐frequency stimulation (HFS) of the subthalamic nucleus (STN) proves to be an efficient treatment for alleviating motor symptoms in Parkinson's disease (PD). However, the mechanisms of HFS underlying these clinical effects remain unknown. Using intracerebral microdialysis, we previously reported that HFS induces, in normal rats, a significant increase of extracellular glutamate (Glu) in the globus pallidus (GP in rats or GPe in primates) and the substantia nigra pars reticulata (SNr), whereas γ‐aminobutyric acid (GABA) was increased only in the SNr. Bradykinesia can be improved by STN stimulation in a frequency‐dependent manner, a plateau being reached around 130 Hz. The aim of the present study was to determine whether neurochemical changes are also frequency dependent. Electrical STN stimulation was applied at various frequencies (10, 60, 130, and 350 Hz) in normal rats. The results show that, for Glu, the amplitude of increase detected in GP and SNr is maximal at 130 Hz and is maintained at 350 Hz. No modifications of GABA were observed in GP whatever the frequency applied, whereas, in SNr, GABA increased from 60 to 350 Hz. Our results provide new neurochemical data implicating STN target structures in deep‐brain‐stimulation mechanisms. © 2003 Wiley‐Liss, Inc.
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DOI: 10.1002/jnr.10577
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Research</title><title level="j" type="abbrev">J. Neurosci. Res.</title><idno type="ISSN">0360-4012</idno><idno type="eISSN">1097-4547</idno><imprint><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>New York</pubPlace><date type="published" when="2003-04-15">2003-04-15</date><biblScope unit="volume">72</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="259">259</biblScope><biblScope unit="page" to="267">267</biblScope></imprint><idno type="ISSN">0360-4012</idno></series><idno type="istex">A521E892B25F314F3E605944102E3E2CA4B8D973</idno><idno type="DOI">10.1002/jnr.10577</idno><idno type="ArticleID">JNR10577</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0360-4012</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>amino acids</term><term>deep brain stimulation</term><term>globus pallidus</term><term>high‐performance liquid chromatography</term><term>intracerebral microdialysis</term><term>substantia nigra pars reticulata</term><term>subthalamic nucleus</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">High‐frequency stimulation (HFS) of the subthalamic nucleus (STN) proves to be an efficient treatment for alleviating motor symptoms in Parkinson's disease (PD). However, the mechanisms of HFS underlying these clinical effects remain unknown. Using intracerebral microdialysis, we previously reported that HFS induces, in normal rats, a significant increase of extracellular glutamate (Glu) in the globus pallidus (GP in rats or GPe in primates) and the substantia nigra pars reticulata (SNr), whereas γ‐aminobutyric acid (GABA) was increased only in the SNr. Bradykinesia can be improved by STN stimulation in a frequency‐dependent manner, a plateau being reached around 130 Hz. The aim of the present study was to determine whether neurochemical changes are also frequency dependent. Electrical STN stimulation was applied at various frequencies (10, 60, 130, and 350 Hz) in normal rats. The results show that, for Glu, the amplitude of increase detected in GP and SNr is maximal at 130 Hz and is maintained at 350 Hz. No modifications of GABA were observed in GP whatever the frequency applied, whereas, in SNr, GABA increased from 60 to 350 Hz. Our results provide new neurochemical data implicating STN target structures in deep‐brain‐stimulation mechanisms. © 2003 Wiley‐Liss, Inc.</div></front></TEI><affiliations><list><country><li>France</li><li>États-Unis</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Maryland</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement><orgName><li>Université Joseph Fourier</li></orgName></list><tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Windels, Francois" sort="Windels, Francois" uniqKey="Windels F" first="François" last="Windels">François Windels</name></region><name sortKey="Bertrand, Anne" sort="Bertrand, Anne" uniqKey="Bertrand A" first="Anne" last="Bertrand">Anne Bertrand</name><name sortKey="Bruet, Nicolas" sort="Bruet, Nicolas" uniqKey="Bruet N" first="Nicolas" last="Bruet">Nicolas Bruet</name><name sortKey="Feuerstein, Claude" sort="Feuerstein, Claude" uniqKey="Feuerstein C" first="Claude" last="Feuerstein">Claude Feuerstein</name><name sortKey="Poupard, Annie" sort="Poupard, Annie" uniqKey="Poupard A" first="Annie" last="Poupard">Annie Poupard</name><name sortKey="Savasta, Marc" sort="Savasta, Marc" uniqKey="Savasta M" first="Marc" last="Savasta">Marc Savasta</name><name sortKey="Savasta, Marc" sort="Savasta, Marc" uniqKey="Savasta M" first="Marc" last="Savasta">Marc Savasta</name></country><country name="États-Unis"><region name="Maryland"><name sortKey="Windels, Francois" sort="Windels, Francois" uniqKey="Windels F" first="François" last="Windels">François Windels</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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