Genetic Differences in Limbic Activation Associated With Nicotine Withdrawal

October 23, 2012 updated by: M.D. Anderson Cancer Center

Pharmacogenetics, Emotional Reactivity and Smoking Cessation: Genetic Differences in Limbic Activation Associated With Nicotine Withdrawal

Objectives:

  • To evaluate neural correlates associated with emotional processing during nicotine withdrawal preferentially involving the amygdala and associated areas within the corticolimbic and mesolimbic circuitry. We hypothesize that relative to a pre-quit baseline, post-quit nicotine withdrawal will result in increased activity to negative emotional cues, in contrast to other cues, in one or more areas of interest, and particularly in the right cerebral hemisphere.
  • To determine if bupropion and varenicline moderate patterns of brain activation during post-quit nicotine withdrawal. We hypothesize that relative to placebo, bupropion and varenicline will attenuate the effects of post-quit nicotine withdrawal on emotional processing, reducing activation to negative emotional cues, relative to other cues, in one or more areas of interest, and particularly in the right cerebral hemisphere.
  • To determine if genotype (DRD2 TaqA2 allele and the ins variant of the -141C ins/del DRD2) moderates patterns of brain activation during post-quit nicotine withdrawal.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Before you begin participation in this study, you will be asked to provide the names and addresses of 3 contacts (family member/friends) who will know your current contact information. This is so study researchers can stay in contact with you throughout the study. This is in case study researchers may need to reach you in order to reschedule your appointment time. You will also be asked to sign a letter giving your contacts permission to provide your contact information to the study staff.

If the staff is not able to reach you, they may try to locate you through telephone directory assistance or the internet. If the study staff is still unable to locate you, they may use a locator service, such as Transunion or the National Change of Address (NCOA) database, which is maintained by the United States Postal Service.

If you agree to take part in this study, you will be asked to come to the Behavioral Science Research Clinic at M. D. Anderson for up to 2 laboratory sessions. One session will be while you are smoking, and one session will be while you are abstinent from smoking (not smoking).

At each of these sessions, you will have functional magnetic resonance imaging (fMRI) of your brain while you are looking at slides. fMRI involves a scanner that uses a large magnet, instead of x-rays, to take pictures of the inside of your body. The slides will include pictures of people, nature scenes, artwork, victims of car crashes, medical procedures (such as open surgery or autopsy), and nude people. You will be shown examples of these slides before having the fMRI, and you will be given the opportunity to withdraw from this study at that time. If you choose to continue on this study, you will have an fMRI taken of your brain. This will involve being passed into a narrow tube-shaped scanner that is open at both ends. During the fMRI, your brain electrical activity will be monitored. The total time for each lab session will last about 1.5 hours.

You should not drink more than 2 cups of coffee or other caffeine drinks at least 2 1/2 hours before each session. This is because caffeine may affect brain functioning. Before one or both of your sessions, you may be asked to not smoke from bedtime on the day before the session until after the session on the next day. Before one or both of your sessions, you may be asked to smoke as you would regularly. Additionally, you may be asked to smoke during one or both of your laboratory sessions.

At each lab session, you will be asked to blow air through a carbon monoxide (CO) measuring device. CO is a gas that is found (in higher levels) in the bodies of cigarette smokers. You will also be asked questions about your smoking habits; your health and medical condition; and about any medications you are taking. You will also be asked to complete some questionnaires that will ask about your mood and feelings. You may be asked to complete these questionnaires before, during, or after the fMRI.

At the end of this study, you will be able to ask questions about the results of this study and about procedures you have experienced during this study.

Your participation in this part of the study will last about 2 weeks. It will end after your last lab session. You will still be considered a participant in the main study (Protocol 2003-1024) and may have additional visits, questionnaires, and other activities to complete.

This is an investigational study. Up to 72 participants will take part in this study. All will be enrolled at M. D. Anderson.

Study Type

Interventional

Enrollment (Actual)

64

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Texas
      • Houston, Texas, United States, 77030
        • UT MD Anderson Cancer Center

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Subject must be a participant in 'Pharmacogenetics, Emotional Reactivity & Smoking' (protocol 2003-1024).
  2. Both parents must be of European descent. The sample will be limited to individuals of European descent because the majority of the published work on the genes of interest has been limited to this racial group. This has been done mostly to prevent population stratification in genetic studies, since allele frequency differences often exist among groups with differing continents of origin.
  3. Right handed. The sample is limited to right handed individuals since we will analyze our neuroimaging data for lateralization effects and inclusion of participants of mixed handedness could confound the results.
  4. Age: 18 years or older

Exclusion Criteria:

1. Contraindications for MR imaging procedures (e.g., subjects with certain types of implanted medical devices, such as pacemakers, neurostimulators, etc., or subjects who are claustrophobic).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Basic Science
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: fMRI
Functional Magnetic Resonance Imaging (fMRI)
Other: Functional Magnetic Resonance Imaging (fMRI)
Functional Magnetic Resonance Imaging (fMRI)of the Brain, one session while smoking, and one session while abstinent from smoking (not smoking).

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Stimulus type (positive, negative, neutral, cigarette) by group (Bupropion/ Varenicline/Placebo)
Time Frame: Pre-quit to 1-2 days post-quit
Pre-quit to 1-2 days post-quit

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

M.D. Anderson Cancer Center

Collaborators

National Institutes of Health (NIH)

Investigators

  • Principal Investigator: Paul Cinciripini, PhD, M.D. Anderson Cancer Center

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

April 1, 2008

Primary Completion (Actual)

October 1, 2012

Study Registration Dates

First Submitted

April 21, 2008

First Submitted That Met QC Criteria

April 22, 2008

First Posted (Estimate)

April 23, 2008

Study Record Updates

Last Update Posted (Estimate)

October 24, 2012

Last Update Submitted That Met QC Criteria

October 23, 2012

Last Verified

October 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2005-0829

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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