Effects of Smoking on Opioid Receptor Binding: A PET Study
Public ClinicalTrials.gov record NCT00618631. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
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Official title
Effects of Smoking on Opioid Receptor Binding Using [(11)C]Carfentanil: An Imaging PET Study
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
Background: * Tobacco smoking is one of the most preventable causes of morbidity and mortality in the world, but the addictive property of nicotine is such that fewer than 10 percent of people who attempt to quit smoking remain tobacco-free after 1 year. Researchers are studying the addictive properties of nicotine in an attempt to develop more successful medication therapies for smoking cessation. * Nicotine acts on chemical receptors in the brain, including opioid receptors that affect the perception of pain. Repeated nicotine administration can cause adaptations in the brain s opioid receptors, which heightens the addictive properties of nicotine and increases the likelihood and severity of withdrawal symptoms associated with smoking cessation. Researchers are interested in using positron emission tomography (PET) scanning to study brain chemical responses to nicotine in current smokers and nonsmokers. Objectives: * To study brain chemical activity related to cigarette smoking and nicotine administration. * To compare the brain chemical activity of current daily smokers with that of nonsmokers. Eligibility: \- Individuals 21 to 50 years of age who are either current smokers (10 to 25 cigarettes daily for at least 2 years) or have had some exposure to tobacco but have never smoked regularly (may have had a maximum of 20 cigarettes in their lifetime and none in past year). Design: * Eligible participants will undergo initial medical and psychological screening and neuropsychological testing before beginning the main phase of the study. Participants will be required to abstain from alcohol and drugs (except caffeine, nicotine, and prescription drugs) for 24 hours before each session, and smokers will refrain from smoking after midnight on the night before each session. * Session 1: Participants will answer questions about nicotine craving and withdrawal symptoms, followed by a magnetic resonance imaging (MRI) scan to provide baseline information about brain activity. * Session 2 and 3: Participants will answer questions about nicotine craving and withdrawal symptoms, and then will smoke one cigarette (either active nicotine or placebo). Researchers will document participants consumption of the cigarette. After the cigarette is smoked, participants will have a PET scan. Blood samples will be drawn during the PET session.
Study identification
- NCT ID
- NCT00618631
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Phase 1
- Enrollment
- 26 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 21 Years to 50 Years
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jan 17, 2008 (Type not available)
- Primary completion
- Not listed
- Completion
- Jan 8, 2015 (Actual)
- Last update posted
- Apr 5, 2018
2008 – 2015
United States locations
- U.S. sites
- 2
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| National Institute on Drug Abuse | Baltimore | Maryland | 21224 | — |
| Johns Hopkins Medical Institute | Baltimore | Maryland | 21287 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00618631, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Apr 5, 2018 · Synced Oct 22, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT00618631 live on ClinicalTrials.gov.