PET Imaging of Cannabinoid CB1 Receptors Using [18F]FMPEP-d2

Study Overview
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Brief Summary
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The purpose of this protocol is to measure brain CB1 receptors in the hope to better understand how they work, so that one day we can understand how the CB1 receptors are involved in psychiatric, neurological, and behavioral disorders.

Detailed Description
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BRAIN IMAGING Objective The central cannabinoid receptor (CB1) is one of the most abundant neuromodulatory receptors in the brain. It is found on glutamatergic, dopaminergic and GABA-ergic synaptic terminals and belongs to G-protein coupled receptor family. The CB1 is a target for drug therapy, including the use of an antagonist as an appetite suppressant. The central cannabinoid receptor CB1 has never been visualized in humans. In collaboration with Eli Lilly, we developed a promising PET ligand for the CB1 receptor: [18F]FMPEP-d2 ((3R,5R)-5-(3-(fluoromethoxy)phenyl)-3-((R)-1-phenylethylamino)-1-(4-(trifluoromethyl)phenyl)pyrrolidin-2-one). Study Population In the current protocol, we wish to evaluate [18F]FMPEP-d2 in approximately 10 healthy subjects. Design Brain imaging studies will consist of subject evaluation followed by PET and MRI scans. Outcome Measures We intend to determine the kinetics of brain uptake and washout, clearance in the plasma, and the distribution volume of [18F]FMPEP-d2 calculated with compartmental modeling. Distribution volume is proportional to the density of receptors and is equal to the ratio at equilibrium of uptake in brain to the concentration of parent radiotracer in plasma. WHOLE BODY DOSIMETRY Objective Should the brain imaging studies prove to be successful, we will continue with whole body dosimetry studies. Preliminary dosimetry studies with [18F]d2-FMPEP have been performed in nonhuman primates; however, these need to be continued in humans before further investigation of this novel tracer can continue. Study Population In the current protocol, we wish to evaluate [18F]FMPEP-d2 in approximately 10 additional healthy subjects. Design The whole body dosimetry studies will consist of subject evaluation followed by a PET scan. Outcome Measures We intend to determine the whole body distribution of activity and thereby calculate radiation exposure to organs of the body. BRAIN IMAGING WITH TEST/RE-TEST Objective Should the brain imaging and dosimetry studies prove to be successful, we will continue with test/retest brain imaging studies. Test/retest studies with [18F]FMPEP-d2 will provide evidence of reproducibility and strengthen the assurance that this radioligand can be used to assess pathology. Previous investigations in developing a CB1 receptor PET tracer have demonstrated the need to test reproducibility (Terry, In Writing; Burns et al 2007). Study Population In the current protocol, we wish to evaluate [18F]FMPEP-d2 in approximately 10 additional healthy subjects. Design The brain imaging test/retest studies will consist of subject evaluation followed by one MRI and two PET scans. Outcome Measures We intend to determine the reproducibility of the outcome measures from the brain imaging, namely, distribution volume.

Official Title
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Imaging of Cannabinoid CB1 Receptors Using [18F]FMPEP-d2

Conditions
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CB1, Cannabinoid, PET, Brain Imaging

Intervention / Treatment
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* Drug: [18F]FMPEP-d2


Participation Criteria
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Eligibility Criteria
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INCLUSION CRITERIA: All subjects must be healthy and aged 18-65 years, with history/physical exam, ECG, and laboratory tests within one year of the PET scan. The volunteer must sign an informed consent form. EXCLUSION CRITERIA: Current psychiatric illness, substance abuse including marijuana use, or severe systemic disease based on history and physical exam. Laboratory tests with clinically significant abnormalities or positive urine toxicology screen. Prior participation in other research protocols in the last year such that radiation exposure would exceed the annual limits. Pregnancy and breast feeding. Claustrophobia. Presence of ferromagnetic metal in the body or heart pacemaker. Positive HIV test. Employee of the investigative site or an immediate family member of an employee of the investigative site. Immediate family member is defined as a spouse, parent, child, or sibling, whether biological or legally adopted. Employee of Eli Lilly and Company.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: [18F]FMPEP-d2|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Efficacy of novel PET tracer for CB1 in brain imaging. |  |  | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Distribution and variance of CB1 receptors in the brain of healthy controls. |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CB1 Receptor, PET, Cannabinoid, [18F]FMPEP-d2, Brain Imaging, Healthy Volunteer, HV