GABAergic Dysfunction in Essential Tremor: An 11C-Flumazenil PET Study

被引:100
作者
Boecker, Henning [1 ,2 ]
Weindl, Adolf [3 ]
Brooks, David J. [4 ]
Ceballos-Baumann, Andres O. [5 ]
Liedtke, Christoph [2 ]
Miederer, Matthias [2 ]
Sprenger, Till [3 ,6 ]
Wagner, Klaus J. [7 ]
Miederer, Isabelle [2 ]
机构
[1] Univ Bonn, FE Klin Funkt Neurobildgebung, Radiol Univ Klin, D-53127 Bonn, Germany
[2] Tech Univ Munich, Klinikum Rechts Isar, Nukl Med Klin, D-8000 Munich, Germany
[3] Tech Univ Munich, Klinikum Rechts Isar, Neurol Klin, D-8000 Munich, Germany
[4] Univ London Imperial Coll Sci Technol & Med, Dept Med, MRC Clin Sci Ctr, London, England
[5] Neurol Krankenhaus Munchen, Munich, Germany
[6] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[7] Tech Univ Munich, Klinikum Rechts Isar, Klin Anaesthesiol, D-8000 Munich, Germany
关键词
tremor; GABA; flumazenil; PET; POSITRON-EMISSION-TOMOGRAPHY; CEREBELLAR; ETHANOL; ACTIVATION; BRAIN; RADIOLIGAND; PREVALENCE; DISORDERS; RECEPTORS;
D O I
10.2967/jnumed.109.074120
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Essential tremor is the most common movement disorder, but the underlying pathophysiology is not well understood. A primary overactivity of cerebellothalamic output pathways is the most conspicuous finding, as indicated by animal and human studies. It has been argued that this overactivity may be due to impaired central inhibition, and converging evidence points toward a potential role of gamma-aminobutyric acid (GABA) dysfunction in tremor generation. Methods: Using C-11-flumazenil and PET, we calculated the distribution volume, an index of availability of benzodiazepine receptor sites of the GABAA complex, in a group of 8 patients with bilateral essential tremor, as compared with 11 healthy controls. Results: Significant increases in binding of C-11-flumazenil at the benzodiazepine receptor site of the GABA(A) receptor in the cerebellum, the ventrolateral thalamus, and the lateral premotor cortex were identified in the essential tremor group. Conclusion: Essential tremor is associated with reduced GABAergic function and increased availability of benzodiazepine receptor sites in brain regions implicated specifically in tremor genesis. This finding is thought to reflect overactivity of cerebellothalamic circuits and, hence, lends support to the "GABA hypothesis'' of essential tremor.
引用
收藏
页码:1030 / 1035
页数:6
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