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Sponsors and Collaborators: |
National Institute of Mental Health (NIMH) National Institute of Mental Health and Eli Lilly & Co. |
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Information provided by: | National Institutes of Health Clinical Center (CC) |
ClinicalTrials.gov Identifier: | NCT00450021 |
This study will test a new radioactive tracer, [(11)C]MePPEP, for use in positron emission tomography (PET) imaging. The tracer is used to visualize cannabinoid receptors, proteins in the brain that mediate a variety of natural chemicals. These receptors may be important in behavioral diseases such as addiction, obesity and psychiatric diseases.
Healthy normal volunteers between 18 and 65 years of age may be eligible for this study.
Ten participants undergo whole body PET imaging to determine where the [(11)C]MePPEP tracer is distributed in the body in order to calculate radiation exposure from the tracer. Another 10 subjects undergo brain imaging with [(11)C]MePPEP to measure cannabinoid receptors in the brain.
All participants are evaluated with a medical history and physical examination, blood and urine tests and an electrocardiogram (ECG) before scanning.
They then have a PET scan. For this procedure, a catheter (plastic tube) is placed in a vein in the arm through which the tracer is injected. A special mask is fitted to the head and attached to the bed to help keep the head in place during the scan. Subjects undergoing brain imaging also have a catheter placed in an artery in the wrist from which blood samples are collected during the procedure. The scan lasts about 2 to 2.5 hours.
Subjects undergoing brain imaging also have magnetic resonance imaging (MRI) within 1 year of the PET scan. For MRI, the subject lies on a bed that moves into the tubular scanner, wearing earplugs to protect the ears from loud noises that occur during the scan. The procedure takes about 1 hour.
Condition | Intervention |
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Healthy |
Drug: [(11)C] MePPEP |
Study Type: | Interventional |
Study Design: | Diagnostic, Non-Randomized, Open Label, Uncontrolled, Single Group Assignment, Pharmacokinetics Study |
Official Title: | Imaging of Cannabinoid CB(1) Receptors Using [11C] MePPEP |
Estimated Enrollment: | 25 |
Study Start Date: | March 2007 |
Estimated Study Completion Date: | February 2008 |
BRAIN IMAGING:
OBJECTIVE:
The central cannabinoid receptor, CB(1) 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 the G-protein coupled receptor family. The CB(1) is a target for drug therapy, including the use of an antagonist as an appetite suppressant. The central cannabinoid receptor CB(1) has never been visualized in humans. In collaboration with Eli Lilly, we developed a promising PET ligand for the CB(1) receptor: [(11)C]MePPEP. This study is known by Eli Lilly as H6O-MC-GCEB.
STUDY POPULATION:
In the current protocol, we wish to evaluate [(11)C]MePPEP in approximately 15 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 [(11)C]MePPEP 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 [(11)C]MePPEP have been performed in nonhuman primates; however, these need to be continued in humans before further investigation of this novel tracer can continue. This study is known by Eli Lilly as H6O-MC-GCEC.
STUDY POPULATION:
In the current protocol, we wish to evaluate [(11)C]MePPEP 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.
Ages Eligible for Study: | 18 Years to 65 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
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:
United States, Maryland | |
National Institutes of Health Clinical Center, 9000 Rockville Pike | |
Bethesda, Maryland, United States, 20892 |
Study ID Numbers: | 070118, 07-M-0118 |
Study First Received: | March 20, 2007 |
Last Updated: | February 10, 2008 |
ClinicalTrials.gov Identifier: | NCT00450021 History of Changes |
Health Authority: | United States: Federal Government |
PET CB1 Receptor Cannabinoid [11C] MePPEP |
Brain Imaging Healthy Volunteer HV |
Healthy |