Brain, Obesity, Dopamine and You Study (BODY)
31. oktober 2016 opdateret af: 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.
Studieoversigt
Status
Afsluttet
Betingelser
Intervention / Behandling
Undersøgelsestype
Interventionel
Tilmelding (Faktiske)
82
Fase
- Ikke anvendelig
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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Missouri
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St. Louis, Missouri, Forenede Stater, 63110
- Washington University Medical School
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Deltagelseskriterier
Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.
Berettigelseskriterier
Aldre berettiget til at studere
18 år til 40 år (Voksen)
Tager imod sunde frivillige
Ja
Køn, der er berettiget til at studere
Alle
Beskrivelse
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).
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Ikke-randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Ingen (Åben etiket)
Våben og indgreb
Deltagergruppe / Arm |
Intervention / Behandling |
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Aktiv komparator: Obese group - Group 1
If you have a BMI between 33kg - 45kg and weight under 350 lbs you could be in group 1.
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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.
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Ingen indgriben: Lean group - Group 2
If you have a BMI between 18.5 kg - 24.9 kg you could be in group 2.
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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To determine the status of postsynaptic D2-like receptor binding in humans with obesity.
Tidsramme: 1 year for each participant
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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.
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1 year for each participant
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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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To determine the relationship between D2-like receptor binding, reward sensitivity and hedonic response to sweet tastes.
Tidsramme: 1 year per participant
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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.
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1 year per participant
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Samarbejdspartnere og efterforskere
Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.
Samarbejdspartnere
Efterforskere
- Ledende efterforsker: Tamara Hershey, Ph.D., Washington University School of Medicine
Datoer for undersøgelser
Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.
Studer store datoer
Studiestart
1. juli 2010
Primær færdiggørelse (Faktiske)
1. juni 2015
Studieafslutning (Faktiske)
1. oktober 2016
Datoer for studieregistrering
Først indsendt
17. marts 2010
Først indsendt, der opfyldte QC-kriterier
25. marts 2010
Først opslået (Skøn)
29. marts 2010
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
2. november 2016
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
31. oktober 2016
Sidst verificeret
1. oktober 2016
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 75-01
Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .
Kliniske forsøg med meal replacements, psychotherapy, dietary education
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Chungbuk National University HospitalUkendtLipidmetabolismeforstyrrelser | Sarkopeni | Kronisk metabolisk lidelseKorea, Republikken