Movement Disorders (revue)

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Idazoxan, an alpha-2 antagonist, and L-DOPA-induced dyskinesias in patients with Parkinson's disease

Identifieur interne : 006E79 ( Main/Merge ); précédent : 006E78; suivant : 006E80

Idazoxan, an alpha-2 antagonist, and L-DOPA-induced dyskinesias in patients with Parkinson's disease

Auteurs : Olivier Rascol [France] ; I. Arnulf [France] ; H. Peyro-Saint Paul [France] ; C. Brefel-Courbon [France] ; M. Vidailhet [France] ; C. Thalamas [France] ; A. M. Bonnet [France] ; S. Descombes [France] ; B. Bejjani [France] ; N. Fabre [France] ; J. L. Montastruc [France] ; Yves Agid [France]

Source :

RBID : Pascal:01-0429759

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English descriptors

Abstract

Dyskinesia is a frequent and disabling side effect in patients with Parkinson's disease treated with chronic dopa-therapy. Preclinical data in the 1-methyl-4-phenyl-1,2,3,6,-tetrahydropyridine (MPTP) monkey suggest that alpha-2 antagonists may reduce dihydroxyphenylalanine (L-DOPA)-induced dyskinesia. We assessed, in a pilot randomised placebo-controlled study, the effects of single oral doses (10 mg, 20 mg, and 40 mg) of idazoxan, an alpha-2 antagonist, on motor parkinsonian disability and L-DOPA-induced dyskinesia following an acute oral challenge of L-DOPA in 18 patients with Parkinson's disease. The severity of L-DOPA-induced dyskinesia improved after 20 mg idazoxan pretreatment, while there was no concommittant deterioration in the antiparkinsonian response to L-DOPA. These results suggest that blocking alpha-2 receptors in patients with Parkinson's disease might improve L-DOPA-induced dyskinesia without the cost of a return of parkinsonian symptomatology. Further studies are required to assess whether this property could have potential therapeutic applications in the long-term management of dys-kinetic patients with Parkinson's disease.

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Pascal:01-0429759

Le document en format XML

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<title level="j" type="main">Movement disorders</title>
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<term>Phase II trial</term>
<term>Treatment</term>
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<term>Parkinson maladie</term>
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<term>Idazoxan</term>
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<front>
<div type="abstract" xml:lang="en">Dyskinesia is a frequent and disabling side effect in patients with Parkinson's disease treated with chronic dopa-therapy. Preclinical data in the 1-methyl-4-phenyl-1,2,3,6,-tetrahydropyridine (MPTP) monkey suggest that alpha-2 antagonists may reduce dihydroxyphenylalanine (L-DOPA)-induced dyskinesia. We assessed, in a pilot randomised placebo-controlled study, the effects of single oral doses (10 mg, 20 mg, and 40 mg) of idazoxan, an alpha-2 antagonist, on motor parkinsonian disability and L-DOPA-induced dyskinesia following an acute oral challenge of L-DOPA in 18 patients with Parkinson's disease. The severity of L-DOPA-induced dyskinesia improved after 20 mg idazoxan pretreatment, while there was no concommittant deterioration in the antiparkinsonian response to L-DOPA. These results suggest that blocking alpha-2 receptors in patients with Parkinson's disease might improve L-DOPA-induced dyskinesia without the cost of a return of parkinsonian symptomatology. Further studies are required to assess whether this property could have potential therapeutic applications in the long-term management of dys-kinetic patients with Parkinson's disease.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>France</li>
</country>
<region>
<li>Midi-Pyrénées</li>
<li>Île-de-France</li>
</region>
<settlement>
<li>Paris</li>
<li>Toulouse</li>
</settlement>
<orgName>
<li>Hôpital de la Salpêtrière</li>
<li>Université Toulouse III - Paul Sabatier</li>
<li>Université de Toulouse</li>
</orgName>
</list>
<tree>
<country name="France">
<noRegion>
<name sortKey="Rascol, O" sort="Rascol, O" uniqKey="Rascol O" first="O." last="Rascol">Olivier Rascol</name>
</noRegion>
<name sortKey="Agid, Y" sort="Agid, Y" uniqKey="Agid Y" first="Y." last="Agid">Yves Agid</name>
<name sortKey="Arnulf, I" sort="Arnulf, I" uniqKey="Arnulf I" first="I." last="Arnulf">I. Arnulf</name>
<name sortKey="Bejjani, B" sort="Bejjani, B" uniqKey="Bejjani B" first="B." last="Bejjani">B. Bejjani</name>
<name sortKey="Bonnet, A M" sort="Bonnet, A M" uniqKey="Bonnet A" first="A. M." last="Bonnet">A. M. Bonnet</name>
<name sortKey="Brefel Courbon, C" sort="Brefel Courbon, C" uniqKey="Brefel Courbon C" first="C." last="Brefel-Courbon">C. Brefel-Courbon</name>
<name sortKey="Descombes, S" sort="Descombes, S" uniqKey="Descombes S" first="S." last="Descombes">S. Descombes</name>
<name sortKey="Fabre, N" sort="Fabre, N" uniqKey="Fabre N" first="N." last="Fabre">N. Fabre</name>
<name sortKey="Montastruc, J L" sort="Montastruc, J L" uniqKey="Montastruc J" first="J. L." last="Montastruc">J. L. Montastruc</name>
<name sortKey="Paul, H Peyro Saint" sort="Paul, H Peyro Saint" uniqKey="Paul H" first="H. Peyro-Saint" last="Paul">H. Peyro-Saint Paul</name>
<name sortKey="Thalamas, C" sort="Thalamas, C" uniqKey="Thalamas C" first="C." last="Thalamas">C. Thalamas</name>
<name sortKey="Vidailhet, M" sort="Vidailhet, M" uniqKey="Vidailhet M" first="M." last="Vidailhet">M. Vidailhet</name>
</country>
</tree>
</affiliations>
</record>

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