The dopamine precursor levodopa is the most effective medication available for the treatment of Parkinson's disease (PD), but eventually it causes levodopa-induced dyskinesias (LID) in the vast majority of the patients. Experimental studies in a rodent model indicate that following peripheral levodopa administrafion there is a larger and prompter surge in striatal dopamine levels (DA) in animals with LID. Because the passage of levodopa through the blood-brain barrier (BBB) is critically regulated at the level of the endothelium, neurovascular alterations need to be thoroughly invesfigated as a possible contribufing factor in LID. To that end, we will expand upon our recent observation in PD patients, that levodopa has divergent effects on regional cerebral metabolism and blood flow, and that the magnitude of local flowmetabolism dissociation, a quantitative index of treatment-mediated hemodynamic alterations, is much greater in patients with LID than those with uncomplicated treatment responses.
In Specific Aim 1, we will study two groups of patients, those with LID and those with uncomplicated levodopa responses, using [^?F]-FDG PET (for cerebral metabolism), [^^0]-H20 PET (for cerebral blood flow), and [?^Rb]-Rubidium PET (for BBB permeability) to compare levodopa-mediated changes across groups.
In Specific Aim 2, we will determine whether localized vasomotor and/or BBB changes exist in drug-naive PD patients and whether fiow-metabolism dissociation develops following one year of treatment with levodopa, but not dopamine agonist.
In Specific Aim 3, we will use a rat model of LID to determine whether changes in local cerebral blood flow relate to structural alterations of the microvasculature and BBB permeability in the affected regions. Previous studies in this animal model have indeed revealed increased angiogenesis and BBB permeability in the basal ganglia. Given that analogous changes have very recently been noted in the basal ganglia of human PD brains at autopsy, this project provides a unique opportunity for translational investigation directed at a major challenge confronting PD patients and their caretakers.
The development of levodopa-induced dyskinesias (LID) in Parkinson's disease (PD) is poorly understood. Using a translational approach, this project will further the understanding of the pathophysiology of this potentially disabling side effect of therapy, and should open avenues for the development of new treatments of LID. Furthermore, improved understanding ofthe role of angiogenesis and blood-brain barrier in PD is likely also relevant to other neurodegenerative diseases.
|Ko, Ji Hyun; Spetsieris, Phoebe G; Eidelberg, David (2018) Network Structure and Function in Parkinson's Disease. Cereb Cortex 28:4121-4135|
|Nazem, Amir; Tang, Chris C; Spetsieris, Phoebe et al. (2018) A multivariate metabolic imaging marker for behavioral variant frontotemporal dementia. Alzheimers Dement (Amst) 10:583-594|
|Ge, Jingjie; Wu, Jianjun; Peng, Shichun et al. (2018) Reproducible network and regional topographies of abnormal glucose metabolism associated with progressive supranuclear palsy: Multivariate and univariate analyses in American and Chinese patient cohorts. Hum Brain Mapp 39:2842-2858|
|Argyelan, Miklos; Herzallah, Mohammad; Sako, Wataru et al. (2018) Dopamine modulates striatal response to reward and punishment in patients with Parkinson's disease: a pharmacological challenge fMRI study. Neuroreport 29:532-540|
|Lerner, Renata P; Francardo, Veronica; Fujita, Koji et al. (2017) Levodopa-induced abnormal involuntary movements correlate with altered permeability of the blood-brain-barrier in the basal ganglia. Sci Rep 7:16005|
|Hendershott, Taylor R; Zhu, Delphine; Llanes, Seoni et al. (2017) Domain-specific accuracy of the Montreal Cognitive Assessment subsections in Parkinson's disease. Parkinsonism Relat Disord 38:31-34|
|Jourdain, Vincent A; Schindlbeck, Katharina A; Tang, Chris C et al. (2017) Increased putamen hypercapnic vasoreactivity in levodopa-induced dyskinesia. JCI Insight 2:|
|Tomše, Petra; Jensterle, Luka; Rep, Sebastijan et al. (2017) The effect of 18F-FDG-PET image reconstruction algorithms on the expression of characteristic metabolic brain network in Parkinson's disease. Phys Med 41:129-135|
|Ng, Bernard; Varoquaux, Gael; Poline, Jean Baptiste et al. (2017) Distinct alterations in Parkinson's medication-state and disease-state connectivity. Neuroimage Clin 16:575-585|
|Vo, An; Sako, Wataru; Fujita, Koji et al. (2017) Parkinson's disease-related network topographies characterized with resting state functional MRI. Hum Brain Mapp 38:617-630|
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