Schizophrenia Clinical Trial
Official title:
Disentangling Pre- and Postsynaptic Aspects of Amphetamine-induced Sensitization: a Combined [18F]DOPA / [11C]-(+)-PHNO PET Study
Patients with schizophrenia show enhanced dopamine synthesis capacity and release, an effect that can be evoked in healthy subjects by repeated amphetamine administration. Therefore for the first time the relationship between dopamine synthesis and release will be studied in healthy subjects before and after amphetamine sensitization in order to better understand adaptive mechanisms of the dopamine system.
Positron emission tomography (PET) studies have consistently shown increased brain dopamine (DA) synthesis and enhanced d-amphetamine-induced DA release in patients with schizophrenia. Repeated administration of d-amphetamine leads to an increased subjective and behavioral drug-response. This effect, termed "sensitization", is paralleled by an increase in dopamine release to levels akin to those observed in schizophrenia. Schizophrenia thus goes along with a state of 'natural sensitization' towards amphetamines. However, while it is known that DA synthesis and release are both enhanced in schizophrenia, it is unknown whether sensitization changes indices of presynaptic DA synthesis in the striatum of healthy subjects. Thus, for the first time, this project will study the effects of repeated d-amphetamine on uptake of the DA precursor [18F]FDOPA and on d-amphetamine-induced changes in binding of the D2/3 receptor agonist radioligand [11C]-(+)PHNO in a within-subject design. Before and after amphetamine sensitization by repeated intermittent administration subjects will receive an [18F]FDOPA and and a [11C]-(+)PHNO PET scan. For the investigation of the influence of functional and structural cortical properties on dopamine synthesis and release, functional and structural magnet resonance imaging will be performed before and after sensitization. ;
| Status | Clinical Trial | Phase | |
|---|---|---|---|
| Recruiting |
NCT05039489 -
A Study on the Brain Mechanism of cTBS in Improving Medication-resistant Auditory Hallucinations in Schizophrenia
|
N/A | |
| Completed |
NCT05321602 -
Study to Evaluate the PK Profiles of LY03010 in Patients With Schizophrenia or Schizoaffective Disorder
|
Phase 1 | |
| Completed |
NCT05111548 -
Brain Stimulation and Cognitive Training - Efficacy
|
N/A | |
| Completed |
NCT04503954 -
Efficacy of Chronic Disease Self-management Program in People With Schizophrenia
|
N/A | |
| Completed |
NCT02831231 -
Pilot Study Comparing Effects of Xanomeline Alone to Xanomeline Plus Trospium
|
Phase 1 | |
| Completed |
NCT05517460 -
The Efficacy of Auricular Acupressure on Improving Constipation Among Residents in Community Rehabilitation Center
|
N/A | |
| Completed |
NCT03652974 -
Disturbance of Plasma Cytokine Parameters in Clozapine-Resistant Treatment-Refractory Schizophrenia (CTRS) and Their Association With Combination Therapy
|
Phase 4 | |
| Recruiting |
NCT04012684 -
rTMS on Mismatch Negativity of Schizophrenia
|
N/A | |
| Recruiting |
NCT04481217 -
Cognitive Factors Mediating the Relationship Between Childhood Trauma and Auditory Hallucinations in Schizophrenia
|
N/A | |
| Completed |
NCT00212784 -
Efficacy and Safety of Asenapine Using an Active Control in Subjects With Schizophrenia or Schizoaffective Disorder (25517)(P05935)
|
Phase 3 | |
| Completed |
NCT04092686 -
A Clinical Trial That Will Study the Efficacy and Safety of an Investigational Drug in Acutely Psychotic People With Schizophrenia
|
Phase 3 | |
| Completed |
NCT01914393 -
Pediatric Open-Label Extension Study
|
Phase 3 | |
| Recruiting |
NCT03790345 -
Vitamin B6 and B12 in the Treatment of Movement Disorders Induced by Antipsychotics
|
Phase 2/Phase 3 | |
| Recruiting |
NCT05956327 -
Insight Into Hippocampal Neuroplasticity in Schizophrenia by Investigating Molecular Pathways During Physical Training
|
N/A | |
| Terminated |
NCT03261817 -
A Controlled Study With Remote Web-based Adapted Physical Activity (e-APA) in Psychotic Disorders
|
N/A | |
| Terminated |
NCT03209778 -
Involuntary Memories Investigation in Schizophrenia
|
N/A | |
| Completed |
NCT02905604 -
Magnetic Stimulation of the Brain in Schizophrenia or Depression
|
N/A | |
| Recruiting |
NCT05542212 -
Intra-cortical Inhibition and Cognitive Deficits in Schizophrenia
|
N/A | |
| Completed |
NCT04411979 -
Effects of 12 Weeks Walking on Cognitive Function in Schizophrenia
|
N/A | |
| Terminated |
NCT03220438 -
TMS Enhancement of Visual Plasticity in Schizophrenia
|
N/A |