Clinical trial NCT06701487: Role of Pavlovian Mechanisms for Control Over Substance Use
Official title: SFB TRR 265: Losing and Regaining Control Over Drug Intake Work Package 1 of Project B03: General and Specific Pavlovian-to-Instrumental Transfer Effects in a Range of Substance Use Disorders
Study type: OBSERVATIONAL
Overall status: RECRUITING
Conditions: Alcohol Use Disorder (AUD)
Alcoholism
Substance Use Disorders
Cannabis Use Disorder
Methamphetamine-dependence
Amphetamine Use Disorder
Cocaine Use Disorder
Keywords: Substance Use Disorder (SUD)
Cannabise Use Disorder
Methamphetamine Use Disorder
Amphetamine Use Disorder
Cocaine Use Disorder
Alcohol Use Disorder (AUD)
Pavlovian-to-Instrumental Transfer (PIT)
General Pavlovian-to-Instrumental Transfer
Outcome-specific Pavlovian-to-Instrumental Transfer
Amygdala
Ventral Striatum
Neuroimaging
Humans
Surveys and Questionnaires
Reward
Cues
Lead sponsor: Technische Universität Dresden
Sponsor class: OTHER
Collaborators: name: Charite University, Berlin, Germany
name: Central Institute of Mental Health, Mannheim
First posted: 2024-11-22
Enrollment: 200
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Groups will be recruited through the addiction in- and outpatient clinic of the Charité, and from the special outpatient clinic for MUD at the University Hospital Dresden as well as from our strategic partner clinic in Radebeul and Städtisches Klinikum Dresden. Moreover, collaborating clinics in Berlin and Dresden will be recruited (with in- or outpatient clinics for treating patients with substance use disorder). Finally, we recruit persons from information centers for substance related problems and addiction groups in Berlin and Dresden and from the general population using advertisement.

Brief summary: During the first funding period (1st FP), the investigators developed a novel full Pavlovian-to-instrumental transfer (PIT) task that allows assessing both, general and specific PIT to investigate whether specific PIT differs between alcohol use disorder (AUD) and control subjects. Preliminary analyses of the full transfer task indicate that AUD participants exhibit a stronger specific PIT effect compared to controls. Based on these findings, the investigators want to compare specific and general PIT effects in patients with moderate to severe substance use disorders (alcohol, cannabis, methamphetamine, amphetamine and cocaine) to healthy controls on the behavioral and neural level (fMRI).

Detailed description: This projects research aim:

1. The investigators aim to compare general and specific PIT effects in patients with moderate to severe substance use disorder (Alcohol, Methamphetamine, Amphetamine and Cocaine) and healthy controls using the newly developed (1st FP) full transfer task and fMRI The investigators expect enhanced general PIT effects in patients compared to controls at the behavioral level, and at the neuronal level enhanced PIT-associated activations in the striatum, and lower activation in the prefrontal cortex (e.g., dlPFC).

The investigators expect enhanced general PIT effects in patients with multiple SUD compared to patients with single SUD.

The investigators expect increased behavioral and neuronal alcohol-specific PIT effects in patients groups that also meet AUD criteria compared to controls and to patients without AUD.

The investigators expect stronger behavioral and neural PIT effects (both general and specific) to predict more substance use at 3-month follow-up.

Therefore, the investigators aim to conduct the Experiments with the following Hypotheses:

Here the investigators assess on a behavioral and neural level a general and specific PIT task by using the full transfer task which was developed in the 1st FP and allows the assessment of both PIT tasks in one paradigm. This task consists of 4 parts: instrumental training, Pavlovian conditioning, Pavlovian-to-instrumental transfer phase and query trials to test participants' explicit knowledge.

The investigators will investigate HCs and three patient groups of high clinical relevance: Patients with (1) AUD without comorbid SUD (cannabis, methamphetamine, amphetamine or cocaine), (2) AUD with comorbid SUD (cannabis and/or methamphetamine and/or amphetamine and/or cocaine), (3) SUD (cannabis and/or methamphetamine and/or amphetamine and/or cocaine) without AUD. The investigators will recruit patients through the addiction outpatient clinic of the Charité (mainly cannabis), the special outpatient clinic for MUD at the University Hospital Dresden as well as the investigators' strategic partner clinic in Radebeul und Städtisches Klinikum Dresden. Furthermore, the investigators will be recruiting from the general population using advertisement. On site, they undergo the comprehensive assessment implemented for the TRR cohort during the 1st FP. The full PIT paradigm is applied as described in Figure 3. Three months after the examination, an online follow-up on the clinical course will be done by using redcap-based questionnaires.

Methods:

WP1 will follow an ANOVA with four groups, including post-hoc group differences.

Functional imaging data will be conducted using a 3 T MR scanner to acquire gradient echo t2\*-weighted echo-planar images (EPI) and analyzed with SPM12. EPI images will be preprocessed and analyzed as implemented during the 1st FP.

Expected results:

The investigators expect that general PIT effects are increased in all patient groups vs. HCs. Moreover, the investigators expect that patients with AUD + comorbid SUD have greater general PIT effects than patients with AUD alone. Concerning alcohol specific PIT, the investigators expect that both AUD groups, but not patients with SUD without AUD have greater effects than HCs. Moreover, the investigators expect that patients with AUD + comorbid SUD have greater alcohol specific PIT effects than patients with AUD alone. Concerning neuroimaging, the investigators expect greater activations in striatum and reduced activation in the DLPFC during PIT in all patient groups vs. HCs. Moreover, the investigators expect greater activations in striatum and reduced activation in the DLPFC in patients with AUD + comorbid SUD as well as in patients with AUD alone. Of note, the investigators expect similar neural activations during specific PIT in HCs and patients with SUD without AUD.

Hypothesis 1a.:

General PIT effects are increased in all patient groups vs. HCs. Specifically, patients with AUD + comorbid SUD will show greater general PIT effects than patients with AUD alone. At the neuronal level patients will show enhanced PIT-associated activations in the striatum, and lower activation in the prefrontal cortex (e.g., dlPFC).

Hypothesis 1b:

Concerning alcohol specific PIT, it is expected that both AUD groups, but not patients with SUD without AUD have greater effects than HC. Moreover, patients with AUD + comorbid SUD will have greater alcohol specific PIT effects than patients with AUD alone. Moreover, the investigators expect greater activations in striatum and reduced activation in the DLPFC in patients with AUD + comorbid SUD as well as in patients with AUD alone.

Hypothesis 1c:

The investigators expect that enhanced specific and general PIT effects are associated with increased substance use at the 3-month follow-up.

Alternative strategies: In case of doubt about the extent to which gustatory alcohol and juice rewards increase the PIT effect in subjects with comorbid SUD, the investigators might alternatively develop and pilot a specific PIT paradigm with substance-related pictures.

Eligibility criteria: Inclusion Criteria:

* Men and women between 18-65 years of age,
* AUD, and/or SUD subjects only: meet 4 or more criteria for DSM-5 alcohol-related and/or substance-related (cannabis, amphetamine, methamphetamine or cocaine disorder (not requiring withdrawal as assessed by an independent psychiatrist),
* Currently using alcohol without a desire for abstinence
* Ability to consent to the study and complete the questionnaires.
* Sufficient language(German) and motor skills for using PC
* existing health insurance

Exclusion Criteria:

* Lifetime diagnosis of DSM-5 bipolar disorder or schizophrenia or schizophrenia spectrum disorder (if induced by drugs, it should happen more than a month ago)
* Current threshold DSM-5 diagnosis of major depressive disorder, or presence of suicidal intention
* High risk (≤ 26) ASSIST scores in other substances other than alcohol, amphetamine, methamphetamine, cannabis, cocaine, tobacco
* History of traumatic brain injury or severe neurological disease (such as Dementia, Parkinson's disease, multiple sclerosis, Epilepsy, Meningitis, Stroke)
* Pregnancy or breastfeeding,
* Ingestion of medications known to interact with the dopamine system in the 10-day period prior to study participation or less than 4 half-lives after last ingestion (rapid urine test); A detailed list of permitted medication can be added upon request
* MR contraindications (e.g., pacemakers, metallic or electronic implants, metallic splinters, surgical staples)
* Color vision deficiency
* sensorineural hearing loss of 30 dB or greater,
* Tinnitus and
* Acute alcohol, substance (cannabis, or methamphetamine, amphetamine, cocaine) intoxication at assessement day verified by breath alcohol tests and drug intoxication verified by rapid urine test.

Primary outcomes:
measure: Neural PIT effect
timeFrame: 1 day
measure: Behavioral full-lever specific and general PIT effect
timeFrame: 1 day
Secondary outcomes:
measure: Alcohol and Substance (cannabis, stimulant/cocaine) consumption after 3 months
timeFrame: 3 months after testing for behavioral and neural PIT effects
Other outcomes:
Locations:
city: Dresden
country: Germany
facility: Department of Psychiatry and Psychotherapy, Technische Universität Dresden
Study officials:
References:
citation: Belanger MJ, Chen H, Hentschel A, Garbusow M, Ebrahimi C, Knorr FG, Zech HG, Pilhatsch M, Heinz A, Smolka MN. Development of Novel Tasks to Assess Outcome-Specific and General Pavlovian-to-Instrumental Transfer in Humans. Neuropsychobiology. 2022;81(5):370-386. doi: 10.1159/000526774. Epub 2022 Nov 14.