This clinical imaging sub-study will use the small molecule translocator protein (TSPO) ligand, 18F-labeled DPA-714, to visualize and quantify neuroinflammation in individuals participating in the UAB Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) and Longitudinal 18F-DPA-714 Imaging in a Parkinson Disease Cohort studies. The UAB Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) study and the Longitudinal 18F-DPA-714 Imaging in a Parkinson Disease Cohort study are separate studies reviewed by the UAB IRB (IRB-300001745 and IRB-300011684 respectively, PI Yacoubian). Each study includes participants with clinically diagnosed PD and healthy controls. This sub-study will examine the role of the immune system, particularly the innate immune system, in the pathophysiology of PD. TSPO is increased during neuroinflammation and is a marker of activated microglia. The PET tracer \[18F\]DPA-714 will be used to image neuroinflammation in the brains of study participants and will be correlated with clinical data collected through participation in the UAB Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) and the Longitudinal 18F-DPA-714 Imaging in a Parkinson Disease Cohort studies. Study participants will be divided into three cohorts; 100 PD participants and 100 healthy volunteers will be enrolled in the UDALL Baseline Cohort, sixty-seven PD participants from the UDALL Baseline Cohort will be enrolled in the UDALL 5-year Follow-up Cohort, and 5 PD participants will be enrolled in the Metabolite Analysis Cohort.

UDALL Baseline Cohort) Participants eligible through enrollment in the UAB Neuroinflammation PD study will be consented for one-time DPA-714 PET/MRI imaging. Imaging results will be correlated with demographics and clinical and biospecimen assessment from the Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) study.In the baseline cohort, we are enrolling subjects to examine the role of brain and systemic inflammation at diagnosis in patients in the early stages of PD. For this study, we are enrolling 100 healthy volunteers and 100 PD participants who will undergo clinical analysis, DPA 714 scans, and plasma and cerebrospinal fluid (CSF) analysis. These subjects will be followed longitudinally in the associated UAB Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) study in order to determine whether DPA 714 signal correlates with other biomarkers of inflammation in the blood or CSF and whether DPA 714 signal predicts motor or cognitive decline over time.

UDALL 5-year Follow-up Cohort) 67 PD participants from the UDALL Baseline Cohort will be consented. Participants will receive follow-up DPA-714 PET/MRI imaging approximately 5 years after baseline imaging. Imaging results will be correlated with demographics and clinical and biospecimen assessment from the Innate and Adaptive Immunity in Parkinson Disease (Clinical Research Core) study.In interval analysis of the original Udall cohort, we observed increased brain inflammation as determined by DPA-714 scans in patients newly diagnosed with PD at baseline compared to health controls. An unknown question is whether this brain inflammation is maintained throughout the disease course. Therefore, we will rescan with DPA-714 subjects 5 years after enrollment who had scans done at baseline (n=67). This will help answer whether brain inflammation changes over time.

Metabolite Analysis Cohort) Five PD participants eligible through enrollment in the UAB Neuroinflammation PD study will be consented for one-time DPA-714 PET/MRI imaging, arterial line placement and metabolite sampling. Imaging results will be correlated with demographics and clinical and biospecimen assessment from the Longitudinal 18F-DPA-714 Imaging in a Parkinson Disease Cohort study. For the metabolite analysis cohort, we will enroll 5 subjects to perform metabolite analysis to validate previous studies that DPA 714 signal in the brain is not affected by metabolism of the radioligand at our center.