PET Imaging of Brain mGluR5 Receptors Using [18F]SP203

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00538798
Recruitment Status : Completed
First Posted : October 3, 2007
Last Update Posted : October 6, 2017
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Institute of Mental Health (NIMH) )

Brief Summary:
The metabotropic glutamate subtype five (mGluR5) receptor is a protein found in the brain and is the target for the excitatory chemical messenger glutimate. The purpose of this protocol is to measure mGluR5 receptors in the brain using positron emission tomography (PET) and a research drug called [18F]SP203.

Condition or disease Intervention/treatment Phase
Healthy Glutamate Receptor mGlur5 Protein Excitatory Amino Acid Receptors Drug Kinetics PET Scan Drug: [18F]SP203 Phase 1

Detailed Description:

Metabotropic glutamate receptors are G-protein coupled receptors that respond to glutamate by activating proteins inside nerve cells that affect cell metabolism, thereby fine-tuning the signals sent between cells to maintain balance in neuronal activity. Metabotropic Glutamate receptors (mGluR5) are Group I receptors localized post-synaptically and found in several regions of the brain including the striatum, hippocampus, amygdala, and cortex. Activation of mGluR5 stimulates phospholipase C, resulting in phosphoinositide hydrolysis and increase of intracellular Ca2+ levels. Several potent antagonists for mGluR5 have been developed, including 6 methyl-2-(phenylethynyl)pyridine (MPEP) and 3-[(2-methyl-1,3-thiazol-4yl)ethynyl] pyridine (MTEP) however, no simple derivatives of MPEP or MTEP had proven to be useful for in vivo imaging.

In the present protocol, we will use a new PET ligand [(18)F]SP203 for two reasons: Part 1.) we will perform kinetic brain imaging to quantify mGluR5 binding parameters in brain and determine the reliability and reproducibility of these measures in 15 healthy controls Part 2.) if the tracer is proved successful in the part 1, we plan to estimate radiation-absorbed doses of [(18)F]SP203 in healthy human subjects by performing whole body imaging.

We will also use another new ligand, [11C]SP203, which has the same structure as [(18)F]SP203 but labeled with (11)C instead of (18)F. Part 3) the same purpose as part 1 but with [(11)C]SP203 instead of [(18)F]SP203. Part 4) if [(11)C]SP203 is proved successful in the part 3, we plan to estimate radiation absorbed doses of [(11)C]SP203 in healthy human subjects. At this moment, we do not plan to perform additional scans of [(18)F]SP203 under the current protocol. All future subjects will participate in scans of [(11)C]SP203.

Additionally, Part 5) we will measure the difference in [(18)F]SP203 concentration between the artery and the vein without PET scanning to assess whether the venous blood is a valid and less invasive substitute of arterial blood. In some of [(18)F]SP203 scans performed in the current protocol, we compared [(18)F]SP203 levels between radial artery and antecubital vein and observed 30% - 60% lower levels in vein. We plan to test whether sampling from a vein in the hand and / or warming up makes [(18)F]SP203 levels in vein similar to artery.

Successful development of a PET ligand to image mGluR5 will have a strong impact on clinical management of brain disorders with disruptions in glutamatergic transmission such as schizophrenia, anxiety, and neurodegenerative disorders including Alzheimer s and Parkinson s disease.

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 50 participants
Primary Purpose: Treatment
Official Title: PET Imaging of Brain mGluR5 Receptors Using [18F]SP203 and [11C]SP203
Study Start Date : September 28, 2007
Actual Study Completion Date : March 17, 2015

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Healthy control subjects aged 18 65 years, with history/physical exam, ECG, and laboratory tests within one year of the PET scan within normal limits.


  1. Current psychiatric illness, substance abuse or severe systemic disease based on history and physical exam.
  2. Laboratory tests with clinically significant abnormalities.
  3. Prior participation in other research protocols or clinical care in the last year such that radiation exposure would exceed the annual limits.
  4. Pregnancy and breast feeding.
  5. Claustrophobia. (part 1 and 3 only)
  6. Presence of ferromagnetic metal in the body or heart pacemaker. (part 1 and 3 only)
  7. Positive HIV test.
  8. Consumed alcohol within 48 hours before the PET scan.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00538798

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Mental Health (NIMH)
Principal Investigator: Masahiro Fujita, M.D. National Institute of Mental Health (NIMH)