PET Imaging of Brain mGluR1 Receptors Using [18F]FIMX
| Status: | Completed |
|---|---|
| Conditions: | Anxiety, Depression, Depression, Major Depression Disorder (MDD) |
| Therapuetic Areas: | Psychiatry / Psychology, Pulmonary / Respiratory Diseases |
| Healthy: | No |
| Age Range: | 18 - 55 |
| Updated: | 2/16/2018 |
| Start Date: | November 8, 2013 |
| End Date: | June 16, 2016 |
Objective:
Metabotropic glutamate receptors (mGluRs) 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. mGluR
subtype 1 (mGluR1s) are located in several brain regions, including the cerebellum,
hippocampus, olfactory bulb, and basal ganglia. mGluR1 activation stimulates phospholipase C,
resulting in phosphoinositide hydrolysis and increased intracellular calcium levels.
Successful development of a positron emission tomography (PET) ligand to image mGlurR1 would
impact clinical management of brain disorders characterized by disruptions in glutamatergic
transmission, including anxiety and stress disorders, drug addiction, epilepsy, Huntington s
disease, and Parkinson s disease. However, detailed study of mGluR1s has heretofore been
hindered by the lack of high affinity and selective ligands for this receptor subtype.
The present protocol will evaluate the ability of a new PET ligand, [18F]FIMX, to image and
quantify mGluR1 in the brain of healthy human volunteers. This protocol covers four phases:
1. Phase 0: screening whole-body scan;
2. Phase 1: kinetic brain imaging to quantify mGluR1 in brain relative to concurrent
measurement of the parent radioligand in arterial plasma;
3. Phase 2: if the tracer is successful in Phase 1, we will estimate radiation-absorbed
doses of [18F]FIMX by performing whole body imaging;
4. Phase 3: test-retest analysis of brain binding relative to concurrent measurement of the
parent radioligand in arterial plasma.
Study Population:
Healthy adult female and male volunteers (n=22, ages 18 to 55) will undergo brain or
whole-body imaging..
Design:
This study will begin with a screening whole-body scan to confirm that the radioactivity has
fairly broad distribution in several organs. For absolute quantification of mGluR1, 22
healthy controls will have brain PET imaging using [18F]FIMX and an arterial line. Up to 12
of them will have a test-retest scan. Eight additional subjects will have a whole body PET
scan for dosimetry, which does not require an arterial line.
Outcome Measures
To assess absolute quantitation of mGluR1 with [18F]FIMX, we will primarily use two outcome
measures: the identifiability and time stability of distribution volume calculated with
compartmental modeling. In test-retest study, we will calculate the retest variability. To
assess whole-body biodistribution and dosimetry of [18F]FIMX we will use the organ
time-activity curves....
Metabotropic glutamate receptors (mGluRs) 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. mGluR
subtype 1 (mGluR1s) are located in several brain regions, including the cerebellum,
hippocampus, olfactory bulb, and basal ganglia. mGluR1 activation stimulates phospholipase C,
resulting in phosphoinositide hydrolysis and increased intracellular calcium levels.
Successful development of a positron emission tomography (PET) ligand to image mGlurR1 would
impact clinical management of brain disorders characterized by disruptions in glutamatergic
transmission, including anxiety and stress disorders, drug addiction, epilepsy, Huntington s
disease, and Parkinson s disease. However, detailed study of mGluR1s has heretofore been
hindered by the lack of high affinity and selective ligands for this receptor subtype.
The present protocol will evaluate the ability of a new PET ligand, [18F]FIMX, to image and
quantify mGluR1 in the brain of healthy human volunteers. This protocol covers four phases:
1. Phase 0: screening whole-body scan;
2. Phase 1: kinetic brain imaging to quantify mGluR1 in brain relative to concurrent
measurement of the parent radioligand in arterial plasma;
3. Phase 2: if the tracer is successful in Phase 1, we will estimate radiation-absorbed
doses of [18F]FIMX by performing whole body imaging;
4. Phase 3: test-retest analysis of brain binding relative to concurrent measurement of the
parent radioligand in arterial plasma.
Study Population:
Healthy adult female and male volunteers (n=22, ages 18 to 55) will undergo brain or
whole-body imaging..
Design:
This study will begin with a screening whole-body scan to confirm that the radioactivity has
fairly broad distribution in several organs. For absolute quantification of mGluR1, 22
healthy controls will have brain PET imaging using [18F]FIMX and an arterial line. Up to 12
of them will have a test-retest scan. Eight additional subjects will have a whole body PET
scan for dosimetry, which does not require an arterial line.
Outcome Measures
To assess absolute quantitation of mGluR1 with [18F]FIMX, we will primarily use two outcome
measures: the identifiability and time stability of distribution volume calculated with
compartmental modeling. In test-retest study, we will calculate the retest variability. To
assess whole-body biodistribution and dosimetry of [18F]FIMX we will use the organ
time-activity curves....
Objective:
Metabotropic glutamate receptors (mGluRs) 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. mGluR
subtype 1 (mGluR1s) are located in several brain regions, including the cerebellum,
hippocampus, olfactory bulb, and basal ganglia. mGluR1 activation stimulates phospholipase C,
resulting in phosphoinositide hydrolysis and increased intracellular calcium levels.
Successful development of a positron emission tomography (PET) ligand to image mGlurR1 would
impact clinical management of brain disorders characterized by disruptions in glutamatergic
transmission, including anxiety and stress disorders, drug addiction, epilepsy, Huntington s
disease, and Parkinson s disease. However, detailed study of mGluR1s has heretofore been
hindered by the lack of high affinity and selective ligands for this receptor subtype.
The present protocol will evaluate the ability of a new PET ligand, [18F]FIMX, to image and
quantify mGluR1 in the brain of healthy human volunteers. This protocol covers four phases:
1. Phase 0: screening whole-body scan;
2. Phase 1: kinetic brain imaging to quantify mGluR1 in brain relative to concurrent
measurement of the parent radioligand in arterial plasma;
3. Phase 2: if the tracer is successful in Phase 1, we will estimate radiation-absorbed
doses of [18F]FIMX by performing whole body imaging;
4. Phase 3: test-retest analysis of brain binding relative to concurrent measurement of the
parent radioligand in arterial plasma.
Study Population:
Healthy adult female and male volunteers (n=22, ages 18 to 55) will undergo brain or
whole-body imaging.
Design:
This study will begin with a screening whole-body scan to confirm that the radioactivity has
fairly broad distribution in several organs. For absolute quantification of mGluR1, 22
healthy controls will have brain PET imaging using [18F]FIMX and an arterial line. Up to 12
of them will have a test-retest scan. Eight additional subjects will have a whole body PET
scan for dosimetry, which does not require an arterial line.
Outcome Measures
To assess absolute quantitation of mGluR1 with [18F]FIMX, we will primarily use two outcome
measures: the identifiability and time stability of distribution volume calculated with
compartmental modeling. In test-retest study, we will calculate the retest variability. To
assess whole-body biodistribution and dosimetry of [18F]FIMX we will use the organ
time-activity curves.
Metabotropic glutamate receptors (mGluRs) 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. mGluR
subtype 1 (mGluR1s) are located in several brain regions, including the cerebellum,
hippocampus, olfactory bulb, and basal ganglia. mGluR1 activation stimulates phospholipase C,
resulting in phosphoinositide hydrolysis and increased intracellular calcium levels.
Successful development of a positron emission tomography (PET) ligand to image mGlurR1 would
impact clinical management of brain disorders characterized by disruptions in glutamatergic
transmission, including anxiety and stress disorders, drug addiction, epilepsy, Huntington s
disease, and Parkinson s disease. However, detailed study of mGluR1s has heretofore been
hindered by the lack of high affinity and selective ligands for this receptor subtype.
The present protocol will evaluate the ability of a new PET ligand, [18F]FIMX, to image and
quantify mGluR1 in the brain of healthy human volunteers. This protocol covers four phases:
1. Phase 0: screening whole-body scan;
2. Phase 1: kinetic brain imaging to quantify mGluR1 in brain relative to concurrent
measurement of the parent radioligand in arterial plasma;
3. Phase 2: if the tracer is successful in Phase 1, we will estimate radiation-absorbed
doses of [18F]FIMX by performing whole body imaging;
4. Phase 3: test-retest analysis of brain binding relative to concurrent measurement of the
parent radioligand in arterial plasma.
Study Population:
Healthy adult female and male volunteers (n=22, ages 18 to 55) will undergo brain or
whole-body imaging.
Design:
This study will begin with a screening whole-body scan to confirm that the radioactivity has
fairly broad distribution in several organs. For absolute quantification of mGluR1, 22
healthy controls will have brain PET imaging using [18F]FIMX and an arterial line. Up to 12
of them will have a test-retest scan. Eight additional subjects will have a whole body PET
scan for dosimetry, which does not require an arterial line.
Outcome Measures
To assess absolute quantitation of mGluR1 with [18F]FIMX, we will primarily use two outcome
measures: the identifiability and time stability of distribution volume calculated with
compartmental modeling. In test-retest study, we will calculate the retest variability. To
assess whole-body biodistribution and dosimetry of [18F]FIMX we will use the organ
time-activity curves.
- INCLUSION CRITERIA:
- Age 18 to 55.
- Able to give written informed consent.
EXCLUSION CRITERIA:
- Any current Axis I diagnosis.
- Clinically significant laboratory abnormalities.
- Positive HIV test.
- Unable to have an MRI scan.
- History of neurologic illness or injury with the potential to affect study data
interpretation.
- Recent exposure to radiation (i.e. PET from other research) that, when combined with
this study, would be above the allowable limits.
- Inability to lie flat on camera bed for at least two hours.
- Pregnancy or breast feeding.
- Able to get pregnant but does not use birth control.
- History of drug or alcohol abuse within 6 months or a history of alcohol or drug
dependence (excepting nicotine) within 3 years
Exclusion criteria for the dosimetry subjects are the same as reported above, with the
exception of MRI contraindications, because an MRI will not be performed in these subjects.
We found this trial at
1
site
9000 Rockville Pike
Bethesda, Maryland 20892
Bethesda, Maryland 20892
Phone: 800-411-1222
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