- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05357612
Characterization of the Serotonin 2A Receptor Selective PET Tracer [18F]MH.MZ in Patients With Neurodegenerative Diseases
Study Overview
Status
Intervention / Treatment
Detailed Description
It is hypothesized that improvement in psychosis symptoms in patients taking pimavanserin will be associated with increased baseline receptor density (Hypothesis 1A), and increased receptor occupancy of 5HT2A receptors following pimavanserin administration (Hypothesis 1B). This will be done by measuring 5HT2A receptor density using the PET radioligand (R)-[18F]MH.MZ within predefined symptom networks for hallucinations, delusions, and sleep. A PET scan will be obtained in PD patients with psychosis at enrollment to measure baseline 5HT2A receptor density and then again after 6 weeks of pimavanserin. The change in binding between baseline and post-drug treatment window will be used to measure 5HT2A receptor occupancy.
It is hypothesize that improvement in psychosis symptoms in patients taking pimavanserin will be associated with increased functional connectivity and cerebral blood flow within predefined symptom networks for hallucinations, delusions, and sleep. This will be tested by obtaining MRI scans assessing resting state functional connectivity and arterial spin labeling in PD patients with psychosis at enrollment (baseline) and then again after 6 weeks of pimavanserin.
It is hypothesized that functional neuroimaging changes in response to pimavanserin will be associated with baseline 5HT2A receptor density and 5HT2A receptor occupancy after pimavanserin administration. To test this hypothesis, the differences in functional neuroimaging measures and PET 5HT2A receptor will be measured in PD psychosis patients off (at baseline) and on Pimavanserin (post-treatment window).
Study Type
Enrollment (Estimated)
Phase
- Phase 4
Contacts and Locations
Study Contact
- Name: Jason Elenberger, MS
- Phone Number: 6158751257
- Email: jason.elenberger@vumc.org
Study Contact Backup
- Name: Katie Hay, MS
- Email: kaitlyn.r.hay@vumc.org
Study Locations
-
-
Tennessee
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Nashville, Tennessee, United States, 37212
- Recruiting
- Vanderbilt University Medical Center
-
Contact:
- Jason Elenberger, MS
- Phone Number: 615-875-1257
- Email: jason.elenberger@vumc.org
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Patient arm - clinical diagnosis of Parkinson disease, diffuse Lewy body disease, multiple systems atrophy, Huntington's Disease, Frontotemporal Dementia, and other variants
- Healthy arm - age and gender matched to patient arm
- Psychosis (presence of hallucinations or delusions) starting after the diagnosis of Parkinson's disease, occurring at least weekly for 4 weeks, severe enough to warrant treatment.
- Study partner available for study visits
Exclusion Criteria:
- Prior stroke or other uncontrolled serious neurological or medical illness
- Contra-indication or inability to tolerate MRI scan
- Use of serotonergic medications in the last 6 weeks
- Incapable of providing independent consent.
- Pregnant or breastfeeding women
- psychosis due to a metabolic, toxic, or primary psychiatric disease
- Deemed unable to complete neurocognitive testing
- For PD Participants: current or prior use of pimavanserin
- Use of antipsychotics in the last 2 weeks
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Pimavanserin
|
PD related Psychosis
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in 5HT2A receptor density measured using the PET radioligand MH.MZ
Time Frame: Baseline and 6 weeks after intervention of Pimavanserin
|
Receptor density (Bmax) of 5HT2A receptors measured using the PET radioligand MH.MZ uptake in regions of interest.
|
Baseline and 6 weeks after intervention of Pimavanserin
|
Change in 5HT2A receptor binding occupancy measured using the PET radioligand MH.MZ
Time Frame: Baseline and 6 weeks after intervention of Pimavanserin
|
Receptor binding occupancy (RO) of 5HT2A receptors measured using the PET radioligand MH.MZ uptake in regions of interest.
|
Baseline and 6 weeks after intervention of Pimavanserin
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in psychosis severity
Time Frame: Baseline and 6 weeks after intervention of Pimavanserin
|
Change in psychosis severity 6 weeks after starting pimavanserin, as measured by Clinician-Rated Dimensions of Psychosis Symptom Severity (CRD-PSS)18; Domain I (Delusions).
Low scores indicate better outcome.
|
Baseline and 6 weeks after intervention of Pimavanserin
|
Change in psychosis severity
Time Frame: Baseline and 6 weeks after intervention of Pimavanserin
|
Change in psychosis severity 6 weeks after starting pimavanserin, as measured by Clinician-Rated Dimensions of Psychosis Symptom Severity (CRD-PSS)18; Domain II (Hallucinations).
Low scores indicate better outcome.
|
Baseline and 6 weeks after intervention of Pimavanserin
|
Changes to functional connectivity and ASL bloodflow
Time Frame: Baseline and 6 weeks after intervention of Pimavanserin
|
Changes to functional connectivity and ASL bloodflow (mL/g/min) within pre-defined networks for delusions, hallucinations, and sleep after 6 weeks of Pimavanserin.
|
Baseline and 6 weeks after intervention of Pimavanserin
|
Collaborators and Investigators
Collaborators
Investigators
- Principal Investigator: Daniel Claassen, MD, Vanderbilt University Medical Center
- Principal Investigator: Ciaran Considine, PhD, Vanderbilt University Medical Center
- Principal Investigator: Richard Darby, MD, Vanderbilt University Medical Center
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Brain Diseases
- Central Nervous System Diseases
- Nervous System Diseases
- Parkinsonian Disorders
- Basal Ganglia Diseases
- Movement Disorders
- Synucleinopathies
- Parkinson Disease
- Neurodegenerative Diseases
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Central Nervous System Depressants
- Antipsychotic Agents
- Tranquilizing Agents
- Psychotropic Drugs
- Serotonin Agents
- Serotonin 5-HT2 Receptor Antagonists
- Serotonin Antagonists
- Antiparkinson Agents
- Anti-Dyskinesia Agents
- Pimavanserin
Other Study ID Numbers
- 212028
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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