- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01318668
A Fmri Study on the Effects of a Conjugate Vaccine and Placebo on CNS Activation and Behavior Following a Nicotine Challenge (EPU057)
An fMRI-study on the Effects of 3'-Aminomethylnicotine-P. Aeruginosa r-Exoprotein a Conjugate Vaccine (NicVAX®) and Placebo on Central Nervous System Activation and Behaviour Following a Nicotine Challenge
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Rationale: To develop a more effective treatment for nicotine addiction is a public health priority. In order to do so a better understanding is needed of the mechanisms 1) underlying nicotine addiction and 2) the way treatments alter the way nicotine transiently and permanently alters multiple cognitive and executive functions. Most effects of nicotine on the Central Nervous System (CNS) are directly mediated by nicotine molecules. Treatment with 3'aminomethylnicotine P. aeruginosa r-Exoprotein A Conjugate Vaccine (NicVAX™) stimulates the production of nicotine specific antibodies. These antibodies bind the small nicotine molecules, preventing them to cross the Blood Brain Barrier (BBB) and thus preventing CNS stimulation. A nicotine challenge given after vaccination will show no or diminished direct effects of nicotine on CNS stimulation. The blocking effects of the nicotine specific antibodies will be evaluated on several cognitive tasks and on reactivity to smoking-related cues.
Objective: Main aim; to show that NicVAX attenuates nicotine induced CNS effects on brain activation and cognitive performance relative to placebo. The secondary aim is to evaluate how these changes in CNS stimulation alter subjective measures and the addictive properties of nicotine.
Study design: within-subject cross-over double-blind placebo controlled study. Study population: 48 current smokers, male, age 25-40, at least smoking 10 cigarettes /day the last year, in general good health. Additional criteria; 1) No contra-indications for MRI 2) No history of cognitive deficits or brain trauma 3) No use of psychoactive medication 4) No contra-indications for nicotine gum.
Intervention (if applicable): The group will be randomized in two sub-populations. 1) 28 volunteers will receive five injections of 3'aminomethylnicotine P. aeruginosa r-Exoprotein A Conjugate Vaccine (NicVAX™), 2) 20 smokers will receive five injections placebo. On test days both groups will be given a nicotine challenge; a chewing gum either containing nicotine (2mg) or a placebo.
Main study parameters/endpoints: correlation between nicotine specific antibody and 1) the BOLD response during resting state, during the smoking-cue reactivity paradigm and during task performance; in regions of interest associated with the specific tasks; 2) the number of correct response and the reaction time; 3) correlation between nicotine specific antibody and subjective signs of nicotine addiction, measured with several questionnaires.
Nature and extent of the burden and risks associated with participation, benefit and group relatedness: participants will complete a medical screening questionnaire (15-30 min) and will undergo a medical screening (45 min; 2 blood samples, a urine sample and an electrocardiogram). Informed consent will be obtained. All participants will be vaccinated with NicVAX or Placebo 5 times on day 0, 28, 56, 84 and 112 (4 weeks in between each injection) During the training session (Day 0; ±1,5 hour) the inclusion/exclusion criteria and baseline laboratory results will be reviewed to ensure that no changes to the participants health and eligibility status occurred since the Screening Visit. Participants will be randomized and receive either one dose NicVAX 400µ in 1 ml or a placebo intramuscular. The cognitive fMRI task will be trained in a dummy scanner, and questionnaires will be completed. Subsequent vaccinations (days 28, 56, 84 and 112) should be given in the alternating deltoid muscle. Participants will be observed for 60 minutes to monitor possible adverse events. Adverse events, vital signs and concomitant medications will be recorded. During each test session (days 133, 140) participants will complete 5 questionnaires (30 minute total) and will perform several cognitive tasks inside the fMRI scanner (scan session in total ~85 min). The last test session (day 140) three blood samples (5-8 ml each) will be taken for nicotine-specific antibody assessment and to monitor changes. In total the study will take 18 hours to complete. The participants will be paid 10 euro/hr as compensation. The risk of vaccination, fMRI scanning and of administration of nicotine 2mg gum (delivering a dose of approximately 1-1.5 mg nicotine to the bloodstream) is negligible for carefully screened participants. The nicotine specific-antibody vaccine has been clinically tested on several occasions; the safety profile was favourable. Local reactogenicity was generally mild to moderate and subsided spontaneously. Vaccinated subjects with the highest antibody levels (top 30%) smoked less cigarettes per day and reported a higher abstinence rate than placebo subjects, establishing proof-of-concept. The group receiving the vaccine could therefore in theory reduce smoking/exposure to tobacco smoke and have consequential health benefits.
Study Type
Enrollment (Actual)
Phase
- Phase 2
- Phase 1
Contacts and Locations
Study Locations
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Limburg
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Maastricht, Limburg, Netherlands, 6226cc
- Maastricht University
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Health male right handed volunteers between 25-40 years of age.
- Smoking at least 10 cigarettes per day
Exclusion Criteria:
- Contra indications for MRI scanner
- History of neurological or psychiatric disease
- known immunodeficiency
- current use of psychoactive medication
- excessive alcohol use
Study Plan
How is the study designed?
Design Details
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Triple
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Nicotine vaccination
18 week treatment with Nicvax
|
5 vaccinations of NicVax 400ug (1 ml) over a 18 week period or matching placebo.
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
FMRI
Time Frame: at 18 and 20 weeks post vaccination
|
Regional blood oxygenated level dependent (BOLD) response (method: BOLD functional MRI) during resting state and during task performance, in regions of interest, before and after nicotine administration.
|
at 18 and 20 weeks post vaccination
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Reaction time
Time Frame: at 18 and 20 weeks post vaccination
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Task performance; the number of correct response and the reaction time in a battery of psycho-motor tests.
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at 18 and 20 weeks post vaccination
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Mood
Time Frame: 18 and 20 weeks post vaccination
|
Mood will be evaluated by means of questionnaires prior to and following the nicotine/placebo challenge
|
18 and 20 weeks post vaccination
|
Collaborators and Investigators
Collaborators
Publications and helpful links
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- CCMO31915
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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