Levodopa-Induced Dyskinesia Mechanisms in Parkinson's Disease
Summary
Levodopa remains the most effective treatment for the motor symptoms of Parkinson’s disease but is frequently complicated by involuntary, peak-of-dose movements known as dyskinesias. These abnormal movements emerge after chronic dopamine replacement and reflect maladaptive plasticity within basal ganglia circuits. Central to this process are changes in dopaminergic signalling that alter the balance of direct and indirect pathways, leading to excessive excitatory drive on cortical motor areas. Structural and functional adaptations occur in nuclei such as the ventral pallidum and putamen, and have been linked to hypersensitive responses in the pre-supplementary motor area. Emerging evidence highlights dynamic fluctuations in network connectivity, impaired inhibitory control, and neurovascular dissociation as key contributors. Understanding these mechanisms is critical for developing strategies that preserve motor benefit while minimising dyskinesia risk.
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Levodopa-Induced Dyskinesia Mechanisms in Parkinson's Disease publication trend
The graph below shows the total number of articles in levodopa-induced dyskinesia mechanisms in parkinson's disease across all publications each year (not limited to Nature Index journals).
Technical terms
Levodopa-Induced Dyskinesia: Involuntary, choreic movements that develop as a side effect of chronic levodopa therapy in Parkinson’s disease.
Ventral Pallidum: A basal ganglia nucleus that modulates output from the striatum to motor and limbic regions.
Striato-Cortical Connectivity: Functional interactions between the striatum and cortical areas involved in movement planning and execution.
Dynamic Functional Network Connectivity: A method to assess time-varying patterns of synchrony among brain networks.
Pre-Supplementary Motor Area (pre-SMA): A medial frontal region engaged in voluntary movement initiation and inhibition.
References
- Microstructural and functional alterations of the ventral pallidum are associated with levodopa‐induced dyskinesia in Parkinson's disease. European Journal of Neurology (2023).
- Abnormal dopaminergic modulation of striato-cortical networks underlies levodopa-induced dyskinesias in humans. Brain (2015).
- Altered dynamic functional network connectivity in levodopa‐induced dyskinesia of Parkinson's disease. CNS Neuroscience & Therapeutics (2022).
- Basal Ganglia Circuits Underlying the Pathophysiology of Levodopa-Induced Dyskinesia. Frontiers in Neuroanatomy (2010).
- Blood Flow and Glucose Metabolism Dissociation in the Putamen Is Predictive of Levodopa Induced Dyskinesia in Parkinson's Disease Patients. Frontiers in Neurology (2019).
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