Genetic Differences in Limbic Activation Associated With Nicotine Withdrawal
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.
調査の概要
詳細な説明
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.
研究の種類
入学 (実際)
段階
- フェーズ 3
連絡先と場所
研究場所
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Texas
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Houston、Texas、アメリカ、77030
- UT MD Anderson Cancer Center
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
説明
Inclusion Criteria:
- Subject must be a participant in 'Pharmacogenetics, Emotional Reactivity & Smoking' (protocol 2003-1024).
- 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.
- 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.
- 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).
研究計画
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：基礎科学
- 割り当て：なし
- 介入モデル：単一グループの割り当て
- マスキング：なし（オープンラベル）
武器と介入
参加者グループ / アーム |
介入・治療 |
|---|---|
|
他の：fMRI
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).
|
この研究は何を測定していますか？
主要な結果の測定
結果測定 |
時間枠 |
|---|---|
|
Stimulus type (positive, negative, neutral, cigarette) by group (Bupropion/ Varenicline/Placebo)
時間枠：Pre-quit to 1-2 days post-quit
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Pre-quit to 1-2 days post-quit
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協力者と研究者
捜査官
- 主任研究者：Paul Cinciripini, PhD、M.D. Anderson Cancer Center
出版物と役立つリンク
便利なリンク
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (見積もり)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
この情報は、Web サイト clinicaltrials.gov から変更なしで直接取得したものです。研究の詳細を変更、削除、または更新するリクエストがある場合は、register@clinicaltrials.gov。 までご連絡ください。 clinicaltrials.gov に変更が加えられるとすぐに、ウェブサイトでも自動的に更新されます。