An Open-Label Feasibility/Pilot Study With [123I]-IBZM SPECT (DOPA-SYN)

Study Overview
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Brief Summary
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This study conducted to more fully evaluate the way that carbidopa/levodopa and entacapone may work in the brain. This research study uses [123I]-IBZM and dynamic SPECT imaging to determine the amount and the duration of dopamine release from specific regions in the brain after treatment with either the combination of carbidopa/levodopa or the combination of carbidopa/levodopa/entacapone.

Detailed Description
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This is a pilot evaluation of dopaminergic function in PD using a bolus plus constant infusion protocol with [123I]-IBZM and SPECT to evaluate the potential for carbidopa/l-dopa alone or carbidopa/l-dopa/entacapone to produce displacement of striatal radioactivity for assessment of intrasynaptic dopamine. We will assess the feasibility of this paradigm for detecting l-dopa effects on the SPECT signal in subjects with PD with disease duration of greater than 4yrs and with a stable response to L-dopa. Each subject will undergo three [123I]-IBZM studies separated by 1-2 weeks. Subjects will be off medication for at least 12 h prior to study For each of the three scan days patients will receive a constant intravenous infusion of [123I]-IBZM over 4-5 hours to establish an equilibrium binding condition of the radiotracer at striatal D2/D3 receptors. Three baseline SPECT acquisitions will be obtained prior to medication dosing to establish a stable baseline. At approximately 5 h after the initiation of the infusion subjects will receive a single oral dose of either carbidopa/levodopa (37.5mg/150mg or 50mg/250mg), or carbidopa/levodopa/entacapone (either 37.5mg/150mg/200mg- STALEVO or 50/250mg/200mg).

Official Title
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Assessment of Carbidopa/l-Dopa and Carbidopa/l Dopa/Entacapone on Synaptic Dopamine in Parkinson's Patients: An Open-Label Feasibility/Pilot Study With [123I]-IBZM SPECT (DOPA-SYN)

Conditions
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Parkinson's Disease

Intervention / Treatment
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* Drug: carbidopa/l-dopa
* Drug: carbidopa/l-dopa/entacapone
* Drug: Stalevo
* Procedure: [123I]-IBZM imaging


Participation Criteria
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Eligibility Criteria
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Main inclusion criteria: The patient is aged 30 years or older. Written informed consent is obtained. Patients have a diagnosis of idiopathic Parkinson's disease. Hoehn and Yahr stages for patients are I-III. Patients have a diagnosis> 4 yrs prior to screening Patients are treated with carbidopa/levodopa with > 300 mg levodopa. Main exclusion criteria: The patient has atypical or drug-induced Parkinson's disease. The patient has dementia (MMSE 24). The patient has a clinically significant clinical laboratory values, and/or medical or psychiatric illness. The patient has any disorder that may interfere with drug absorption, distribution, metabolism, or excretion (including gastrointestinal surgery). The patient has evidence of clinically significant gastrointestinal, cardiovascular, hepatic, renal, hematological, neoplastic, endocrine, neurological, immunodeficiency, pulmonary, or other disorder or disease. The patient has been treated with a dopamine agonist within the past 30 days. Concomitant treatment with Monoamine Oxidase (MAO)-inhibitors (except selegiline <10 mg/day) within 30 days prior to the screening visit Patient has a history of iodine allergy

Ages Eligible for Study
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Minimum Age: 30 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: carbidopa/l-dopa|nan|
|Drug: carbidopa/l-dopa/entacapone|nan|
|Drug: Stalevo|nan|
|Procedure: [123I]-IBZM imaging|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The primary outcome will be the reduction from baseline in IBZM striatal uptake during a 6-8 hour assessment period after treatment. |  | 6-8hrs | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Secondary Measures include: Putamen and caudate uptake over time, UPDRS scores, and Pharmacokinetic analysis. |  | 6-8hrs | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Parkinson, brain imaging