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MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor
Published on: December 13, 2017
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The GABA Hypothesis in Essential Tremor: Lights and Shadows
1Movement Disorders Unit, Department of Neurology, Sant Pau Hospital, Autonomous University of Barcelona, Catalonia, Spain.
Tremor and Other Hyperkinetic Movements (New York, N.Y.)
|August 15, 2014
Summary
The gamma-aminobutyric acid (GABA) hypothesis suggests GABA system dysfunction in essential tremor (ET), particularly in the cerebellum. While supported by some evidence, further research is needed to confirm GABA deficits and explore targeted therapies.
Area of Science:
- Neuroscience
- Neurology
Background:
- Essential tremor (ET) is linked to the gamma-aminobutyric acid (GABA) hypothesis, suggesting a compromised GABAergic system, especially within the cerebellum.
- This review synthesizes current evidence supporting and challenging the GABA hypothesis in ET.
Purpose of the Study:
- To critically evaluate the evidence for the GABA hypothesis of essential tremor.
- To identify gaps in knowledge and suggest future research directions.
Main Methods:
- Comprehensive review of published studies on GABA dysfunction in ET.
- Inclusion of data from cerebrospinal fluid analysis, pathology, electrophysiology, genetics, neuroimaging, animal models, and drug therapies.
Main Results:
- Evidence supports a four-step GABA hypothesis: cerebellar degeneration, reduced GABA activity, disinhibition of cerebellar neurons, and increased thalamic/thalamo-cortical rhythmic activity leading to tremor.
- Contradictory findings include limited supporting studies, inconsistent post-mortem data, negative genetic studies, and low efficacy of GABAergic drugs for ET.
Conclusions:
- The GABA hypothesis remains the leading explanation for ET pathophysiology, despite existing uncertainties.
- Further research is crucial to elucidate the neurodegenerative aspects, confirm GABAergic deficits in the cerebellum, and develop targeted therapies to enhance cerebellar GABA transmission.
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