Characterize The Modulatory Effects Of Dopamine D2/D3 Receptor Agonist And Antagonist Drugs On Compulsive Behaviors
Study Details
Study Description
Brief Summary
3 groups of subjects (healthy controls, OCD subjects and stimulant-dependent subjects) will receive pramipexole (1.5 mg, single dose), amisulpride (400 mg, single dose) or placebo in a cross-over, double-blind, placebo-controlled design.
Effects of compulsive behaviour will be assessed using fMRI and cognitive testing.
Assess biomarkers including cardiovascular responses and plasma levels. All groups studied on 3 separate occasions following screening, with at least a week intervening between consecutive assessments. The procedures to be adopted for study assessment will be identical on each occasion.
Condition or Disease | Intervention/Treatment | Phase |
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Phase 1 |
Study Design
Outcome Measures
Primary Outcome Measures
- Investigate that drug addicts or OCD patients will show similar abnormalities of compulsive behaviour and functional activation of ventral fronto-striatal systems. MRI scans will occur on Wk 1, 2 and 3. Neuropsychological testing Wk 1, 2 and 3. [on Wk 1, 2 and 3]
Secondary Outcome Measures
- Test the prediction that a dopamine D2/D3 agonist drug (pramipexole)by PK levels. PK sample taken on Week 1 only. [on Week 1 only.]
- Measure of brain functional activation at rest. [up to week 3]
- Measure of behavioural performance [up to week 3]
- Measure of peripheral blood for gene expression and proteomic changes. [up to week 3]
- Genetic variation in selected genes [up to week 3]
- Clinical measures (SSRS, SSR, BL-VAS, BDI-II) [up to week 3]
Eligibility Criteria
Criteria
Inclusion Criteria:
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Male or female, between 18 - 55 years of age; the groups will be matched for either handedness.
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Participants must have the ability to comprehend the key components of the consent form and provide informed consent.
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Participants must lead and write (in English) at a level sufficient to complete study related assessments.
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Assessment by a psychiatrist or psychologist, which includes a face-to-face evaluation of the individual using the DSM-VI diagnosis.
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No history of neurological disorder, head/brain injury, hepatitis, or visual impairment.
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No MRI contra-indications (metal in body, claustrophobia) and able to provide blood samples (venous accessibility, especially relevant for drug users).
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Patients with obsessive-compulsive disorder will have a minimum 2-year history of compulsive behaviours satisfying DSM-IV-TR criteria for OCD.
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Participants with chronic stimulant use will have a minimum 2-year history of dependence on class A stimulants, with age of drug abuse onset before 20 years, and will satisfy DSM-IV-TR criteria for dependence on stimulant drugs.
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Control volunteers have to be in good mental and physical health.
Exclusion Criteria:
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A personal history of psychiatric or neurological disorders, as defined by the DSMIV (except OCD in patients with OCD and substance dependence in drug users)
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A history or presence of alcohol / substance abuse or dependence (other than nicotine), as defined by the DSM-IV-TR (except drug dependence group).
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A BDI-II total score greater than 14 will lead to exclusion from the study.
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Treatment with methadone or buprenorphine may interfere with the experimental tasks, and therefore, will lead to exclusion from the study.
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Participants who have any laboratory abnormality that in the investigator's judgement is considered to be clinically significant and could potentially affect subject safety or study outcome.
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History of clinically significant or current renal dysfunction.
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Clinically significant abnormalities in hematology, blood chemistry, MRI, urinalysis or physical examination not resolved by baseline visit.
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Impaired liver function at baseline or history of liver dysfunction.
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Female participant is pregnant or currently breastfeeding.
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Any serious medical disorder or condition that would in the Investigator's opinion, preclude the administration of study medication and or a history of clinically significant hepatic, cardiac, renal, neurologic, cerebrovascular, metabolic or pulmonary disease.
Contacts and Locations
Locations
Site | City | State | Country | Postal Code | |
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1 | GSK Investigational Site | Cambridge | Cambridgeshire | United Kingdom | CB2 0QQ |
Sponsors and Collaborators
- GlaxoSmithKline
Investigators
- Study Director: GSK Clinical Trials, GlaxoSmithKline
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- TMT106512