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- Ensayo clínico NCT02094196
The Role of Dopaminergic and Glutamatergic Neurotransmission for Dysfunctional Learning in Alcohol Use Disorders (LeADP5)
The Role of Dopaminergic and Glutamatergic Neurotransmission for Dysfunctional Learning in Alcohol Use Disorders (LeAD P5)
The aim of this project is to assess reward- based learning behavior and its association with alterations in dopaminergic and glutamatergic transmission in detoxified alcohol-dependent patients and matched controls.
The investigators will explore how these alterations interact with clinical and psychosocial factors which can modify the relapse risk and learning deficits.
Patients will be detoxified in an inpatient setting. Clinical assessments, behavioral paradigms of learning and brain imaging will be carried out within at least 4 half- lives after any psychotropic medication.
The investigators will implement and apply functional imaging paradigms assessing Pavlovian-to-instrumental transfer and reversal learning tasks and associate model parameters of learning with alcohol craving, intake and prospective relapse risk.
In this project, the impact of the dopamine x glutamate interaction on learning deficits and consecutive relapse probability is targeted with [18F]fallypride PET and the measurement of absolute concentrations of glutamate with magnetic resonance spectroscopy (MRS).
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Descripción detallada
Alcohol consumption despite negative consequences may rely on impaired flexibility in adapting the behavior to environmental changes, i.e. learning in response to reward contingencies. This learning deficit is of clinical relevance particularly during therapy and for the psychosocial outcome.
The reduced availability of central dopamine D2-receptors in detoxified alcohol dependent patients observed in PET investigations and their hypothetical effects on reward-related learning are in line with evidence for learning deficits in hypodopaminergic states, particularly for avoidance learning in non-dependent samples. Growing evidence indicates that the learning-related striatal dopamine signals are modulated by higher executive functions involving, e.g., the prefrontal cortex.
Here, broad glutamatergic outputs of the prefrontal cortex are crucial for subcortical learning mechanisms and match with recent models of interactive dopamine-glutamate dysfunctions and models of neurotrophic signaling in alcohol dependence.
Tipo de estudio
Inscripción (Actual)
Contactos y Ubicaciones
Ubicaciones de estudio
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Berlin, Alemania, 10117
- Charité - Universitätsmedizin Berlin
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Berlin, Alemania, 10115
- Charité Berlin, Division of Neuroimaging
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Método de muestreo
Población de estudio
Descripción
Inclusion Criteria:
- Alcohol dependence according to DSM-IV
- Minimum of 72 hours of abstinence, maximum of 21 days of abstinence
- Minimum of three years of alcohol dependence
- Low severity of withdrawal symptoms
- Ability to provide fully informed consent and to use self- rating scales
Exclusion Criteria:
- Lifetime history of DSM- IV bipolar or psychotic disorder
- Current threshold DSM-IV diagnosis of any following disorders: current major - depressive disorder, generalized anxiety disorder, PTSD, borderline personality disorder or obsessive- compulsive disorder
- History of substance dependence other than alcohol or nicotine dependence
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
Cohortes e Intervenciones
Grupo / Cohorte |
Intervención / Tratamiento |
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Controls, highrisk for AD
Community-based ad-hoc participants, high risk for alcohol dependence, matched to inpatients by sociodemographics
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Controls, low risk for AD
Community-based ad-hoc participants, low risk for alcohol dependence, matched to inpatients by sociodemographics
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Alcohol detoxification
Inpatients with alcohol dependence from local psychiatric hospital wards (18-65 years old)
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Detoxified alcohol- dependent patients in an inpatient setting
Otros nombres:
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¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
---|---|---|
Striatal D2-receptor availability (PET) and prefrontal glutamate concentration (MRS)
Periodo de tiempo: first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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reduction in striatal D2-receptor availability and a increase in prefrontal glutamate concentration in alcohol-dependent patients compared to healthy controls
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first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
---|---|---|
behavioral data in reward-habit-learning paradigms
Periodo de tiempo: first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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Reduced learning speed and PIT withdrawal score in the probabilistic reversal learning task
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first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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Treatment response
Periodo de tiempo: 12-month follow-up period beginning after first assessment timepoint
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test the predictive effects of striatal D2-receptor availability and prefrontal glutamate availability for treatment outcome (relapse vs abstinence) in alcohol-dependent patients
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12-month follow-up period beginning after first assessment timepoint
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Otras medidas de resultado
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
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striatal-prefrontal connectivity (fMRI)
Periodo de tiempo: first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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striatal-prefrontal connectivity (see other LeAD-projects) in the probabilistic reversal learning task
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first assessment time point (alc. dependent pat. up to 21 days after detoxification)
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Colaboradores e Investigadores
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Jürgen Gallinat, Prof MD, Charite University, Berlin, Germany
Publicaciones y enlaces útiles
Enlaces Útiles
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio (Actual)
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
- Desordenes mentales
- Trastornos inducidos químicamente
- Comportamiento de bebida
- Trastornos relacionados con el alcohol
- Trastornos relacionados con sustancias
- Consumo de alcohol
- Alcoholismo
- Efectos fisiológicos de las drogas
- Agentes antiinfecciosos, locales
- Agentes antiinfecciosos
- Depresores del sistema nervioso central
- Etanol
Otros números de identificación del estudio
- GA707/6-1
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .
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