Parkinson's Disease
Conditions
Brief summary
The purpose of this study is to determine if changes in brain serotonin affects the accumulation of amyloid in the brain. The investigators will use brain imaging methods to measure the amount of serotonin and amyloid in the brain of individuals with Parkinson's Disease (PD) and otherwise healthy older people. PD participants will undergo repeat brain imaging to assess amyloid accumulation two years after their first brain imaging session. All participants will undergo examinations to assess their motor function, and asked questions to assess their mood and thinking.
Detailed description
Parkinson's disease (PD) is a common problem of older people often causing significant problems with thinking and memory. Abnormal accumulation within in the brain of a protein called amyloid is felt to contribute to impaired thinking and memory in PD. Excessive accumulation of this protein is also involved in Alzheimer disease (AD) and may influence thinking and memory in otherwise healthy older people. Recent evidence suggests that changes in the amount of another brain chemical, serotonin, influences the amount of amyloid accumulating in the brains of people with PD and otherwise healthy older people. The purpose of this study is to determine if changes in brain serotonin affects the accumulation of amyloid in the brain. The investigators use brain imaging methods to measure the amount of serotonin and amyloid in the brain of individuals with PD and otherwise healthy older people. PD participants will undergo repeat brain imaging to assess amyloid accumulation 2 years after their first brain imaging session. All participants will undergo examinations to assess their motor function, and asked questions to assess their mood and thinking.
Interventions
RADIATIONPET imaging
Serotonin, Dopamine and Amyloid PET imaging
Sponsors
University of Michigan
Study design
Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
45 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Persons who have been diagnosed with Parkinson disease age 45 years and older are eligible to participate in this study. * Healthy older individuals (ages 60-80) without neurologic problems are eligible to participate.
Exclusion criteria
* Individuals using some drugs cannot participate. These include anti-depressant medications, buproprion, or St. John's Wort, as well as dopamine antagonist medications. * Women of childbearing age may not participate. * Individuals unable to have MRI scans because of a pacemaker or metal fragments may not participate. * Individuals with a history of stroke may not participate. People with any contraindication of PET imaging such as previous participation in research procedures involving ionizing radiation may not be eligible to participate in this study.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Regional brain beta amyloid levels and regional brain serotonin terminal density as measured by PET brain imaging. | 2 years | The PET imaging measures of regional brain beta amyloid levels and regional serotonin terminal density will be compared across participants to determine if there is a relationship between the regional density of serotonin terminals and the accumulation of beta amyloid. |
Countries
United States
Outcome results
None listed