Movement Disorders (revue)

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Fipamezole (JP‐1730) is a potent α2 adrenergic receptor antagonist that reduces levodopa‐induced dyskinesia in the MPTP‐lesioned primate model of Parkinson's disease

Identifieur interne : 004085 ( Main/Exploration ); précédent : 004084; suivant : 004086

Fipamezole (JP‐1730) is a potent α2 adrenergic receptor antagonist that reduces levodopa‐induced dyskinesia in the MPTP‐lesioned primate model of Parkinson's disease

Auteurs : Juha-Matti Savola [Finlande] ; Michael Hill [Royaume-Uni] ; Mia Engstrom [Finlande] ; Hannele Merivuori [Finlande] ; Siegfried Wurster [Finlande] ; Steven G. Mcguire [Royaume-Uni] ; Susan H. Fox [Royaume-Uni] ; Alan R. Crossman [Royaume-Uni] ; Jonathan M. Brotchie [Royaume-Uni, Canada]

Source :

RBID : ISTEX:3D136688F336226CEC2D8EB2B195C0725A059625

Descripteurs français

English descriptors

Abstract

Previous studies in the MPTP‐lesioned primate model of Parkinson's disease have demonstrated that α2 adrenergic receptor antagonists such as idazoxan, rauwolscine, and yohimbine can alleviate L‐dopa–induced dyskinesia and, in the case of idazoxan, enhance the duration of anti‐parkinsonian action of L‐dopa. Here we describe a novel α2 antagonist, fipamezole (JP‐1730), which has high affinity at human α2A (Ki, 9.2 nM), α2B (17 nM), and α2C (55 nM) receptors. In functional assays, the potent antagonist properties of JP‐1730 were demonstrated by its ability to reduce adrenaline‐induced 35S‐GTPγS binding with KB values of 8.4 nM, 16 nM, 4.7 nM at human α2A, α2B, and α2C receptors, respectively. Assessment of the ability of JP‐1730 to bind to a range of 30 other binding sites showed that JP‐1730 also had moderate affinity at histamine H1 and H3 receptors and the serotonin (5‐HT) transporter (IC50 100 nM to 1 μM). In the MPTP‐lesioned marmoset, JP‐1730 (10 mg/kg) significantly reduced L‐dopa–induced dyskinesia without compromising the anti‐parkinsonian action of L‐dopa. The duration of action of the combination of L‐dopa and JP‐1730 (10 mg/kg) was 66% greater than that of L‐dopa alone. These data suggest that JP‐1730 is a potent α2 adrenergic receptor antagonist with potential as an anti‐dyskinetic agent in the treatment of Parkinson's disease. © 2003 Movement Disorder Society

Url:
DOI: 10.1002/mds.10464


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<term>Antiparkinson Agents (therapeutic use)</term>
<term>Antiparkinson agent</term>
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<div type="abstract" xml:lang="en">Previous studies in the MPTP‐lesioned primate model of Parkinson's disease have demonstrated that α2 adrenergic receptor antagonists such as idazoxan, rauwolscine, and yohimbine can alleviate L‐dopa–induced dyskinesia and, in the case of idazoxan, enhance the duration of anti‐parkinsonian action of L‐dopa. Here we describe a novel α2 antagonist, fipamezole (JP‐1730), which has high affinity at human α2A (Ki, 9.2 nM), α2B (17 nM), and α2C (55 nM) receptors. In functional assays, the potent antagonist properties of JP‐1730 were demonstrated by its ability to reduce adrenaline‐induced 35S‐GTPγS binding with KB values of 8.4 nM, 16 nM, 4.7 nM at human α2A, α2B, and α2C receptors, respectively. Assessment of the ability of JP‐1730 to bind to a range of 30 other binding sites showed that JP‐1730 also had moderate affinity at histamine H1 and H3 receptors and the serotonin (5‐HT) transporter (IC50 100 nM to 1 μM). In the MPTP‐lesioned marmoset, JP‐1730 (10 mg/kg) significantly reduced L‐dopa–induced dyskinesia without compromising the anti‐parkinsonian action of L‐dopa. The duration of action of the combination of L‐dopa and JP‐1730 (10 mg/kg) was 66% greater than that of L‐dopa alone. These data suggest that JP‐1730 is a potent α2 adrenergic receptor antagonist with potential as an anti‐dyskinetic agent in the treatment of Parkinson's disease. © 2003 Movement Disorder Society</div>
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