- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01094756
Brain, Obesity, Dopamine and You Study (BODY)
October 31, 2016 updated by: Washington University School of Medicine
Central Dopamine Receptors In Obesity
Central dopamine is thought to play a significant role in obesity.
In support of this idea, animal studies and one human positron emission tomography (PET) study have found reduced postsynaptic D2-like receptor availability in the striatum in obesity, with lower D2 receptor availability associated with higher weight.
In addition, reward sensitivity and hedonic responses, known to be related to dopamine function, have also been implicated in obesity and obesity-related eating behavior.
These reports have led to the concept that dopaminergic abnormalities (e.g.
reduced D2-like receptors) influence reward sensitivity, leading to altered eating behaviors and eventually obesity.
However, there are several critical limitations of the human D2 receptor studies that limit the strength of their conclusions and thus the interpretations and speculations embedded in literature that relies on this work.
First, estimates of D2-like receptors in humans have been confounded by potential differences in endogenous dopamine release since the PET ligand (raclopride) used is known to be displaceable from receptors by endogenous dopamine.
Second, failure to rigorously screen obese individuals for diabetes confounds conclusions, since diabetes has been independently associated with dopaminergic abnormalities such as reduced D2-like receptors and muted dopamine release in diabetic rats.
Finally, no human studies have addressed whether reduced D2-like receptor levels are a risk factor for obesity, a consequence of engaging in obesity-related behaviors or being obese or all of the above.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Study Type
Interventional
Enrollment (Actual)
82
Phase
- Not Applicable
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
-
-
Missouri
-
St. Louis, Missouri, United States, 63110
- Washington University Medical School
-
-
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 to 40 years (Adult)
Accepts Healthy Volunteers
Yes
Genders Eligible for Study
All
Description
Inclusion Criteria:
- 41 obese adults (BMI 33 kg - 45 kg.)
- 24 lean adults (BMI 18.5 kg - 24.9 kg.)
Exclusion Criteria:
Subjects who are:
- smokers,
- pregnant or lactating, postmenopausal,
- have diabetes or impaired oral glucose tolerance (fasting blood glucose level of < 100 mg/dl and a 2 hour post-glucose challenge plasma glucose level of < 140mg/dl, per ADA criteria; ADA 2004),
- significant organ system dysfunction, anemia (Hb <10 g/dl),
- take medications that could influence the study results, any history of dopamine agonist or antagonist treatment (e.g. neuroleptics or metoclopramide),
- parkinsonism on exam,
- borderline or lower IQ (<80 full scaled score), or
- any psychiatric or neurologic illness (e.g. drug abuse, Parkinson disease, Tourette syndrome, stroke) that could affect the interpretation of the data, compliance or completion of the study will be excluded. Specific psychiatric exclusions are lifetime psychosis, current mania, substance dependence, major depression, social phobia, tic disorders, eating disorders and panic disorder. Dysthymia will not be excluded, but levels of depression will be measured with the BDI for future exploratory analysis.
- Lean subjects will be excluded for being obese in the past (based on maximum BMI not related to pregnancy).
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: Treatment
- Allocation: Non-Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Obese group - Group 1
If you have a BMI between 33kg - 45kg and weight under 350 lbs you could be in group 1.
|
After the screening and scan days are completed, obese subjects will begin a lifestyle intervention program that includes dietary (low-calorie diet) and behavioral education topics.
Treatment will be provided in individual weekly sessions.
Each hour-long session will be led by a behavioral counselor or registered dietitian in the Weight Management Center at Washington University.
The behavioral program will use cognitive-behavioral techniques to foster adherence to diet prescriptions and to build a supportive environment for the participant.
The program will emphasize strategies of self-monitoring and goal-setting, and will include problem-solving, overcoming high-risk situations for unhealthy eating, relapse prevention, and strategies for long-term weight maintenance.
Handouts will be provided for study subjects to allow them to record the setting and reaching of dietary goals, as well as summarize the key points of the educational content.
|
No Intervention: Lean group - Group 2
If you have a BMI between 18.5 kg - 24.9 kg you could be in group 2.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
To determine the status of postsynaptic D2-like receptor binding in humans with obesity.
Time Frame: 1 year for each participant
|
To test this hypothesis, we will measure D2-like receptor binding with PET and a specific, non-competitive D2-like receptor ligand NMB in obese and lean individuals.
|
1 year for each participant
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
To determine the relationship between D2-like receptor binding, reward sensitivity and hedonic response to sweet tastes.
Time Frame: 1 year per participant
|
To test this hypothesis we will correlate D2-like receptor binding levels in the striatum with reward questionnaires and standardized assessments of sweet taste responses within each group.
|
1 year per participant
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Collaborators
Investigators
- Principal Investigator: Tamara Hershey, Ph.D., Washington University School of Medicine
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
July 1, 2010
Primary Completion (Actual)
June 1, 2015
Study Completion (Actual)
October 1, 2016
Study Registration Dates
First Submitted
March 17, 2010
First Submitted That Met QC Criteria
March 25, 2010
First Posted (Estimate)
March 29, 2010
Study Record Updates
Last Update Posted (Estimate)
November 2, 2016
Last Update Submitted That Met QC Criteria
October 31, 2016
Last Verified
October 1, 2016
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- 75-01
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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