Smoking-induced Dopamine Release: a [11C]-(+)-PHNO PET Study in Humans
4. marts 2013 opdateret af: Bernard Le Foll, Centre for Addiction and Mental Health
Does the Insula Control Smoking-induced Dopamine Release? A TMS/[11C]-PHNO Study in Humans. Part I: Smoking-induced Dopamine Release: a [11C]-(+)-PHNO PET Study in Humans.
This study will evaluate effects of smoking on the dopaminergic system by using PET tomography with new radioligand, [11C]-(+)-PHNO.
Our primary hypothesis is that smoking a cigarette will produce dopamine release and this release can be measured using PET imaging and the [11C]-(+)-PHNO radiotracer.
The secondary hypothesis is that this smoking induced dopamine release will be correlated with subjective craving and anxiety ratings.
Studieoversigt
Status
Afsluttet
Betingelser
Detaljeret beskrivelse
This will be a within-subjects study in healthy male and female smokers.
There will be one within factor condition: Smoking and Non Smoking.
Therefore, there will be a repeated measure of PET scans using [11C]-(+)-PHNO under two different conditions.
Ten subjects (n=5 male and n=5 female) included in the study will come on two different days and will have a Smoking or Non smoking session performed just before the PET study.
Subjective assessments will be conducted at each experimental condition.
Undersøgelsestype
Observationel
Tilmelding (Faktiske)
10
Kontakter og lokationer
Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.
Studiesteder
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Ontario
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Toronto, Ontario, Canada, M5S 2S1
- Centre for Addiction and Mental Health - 33 Russell St
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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
21 år til 45 år (Voksen)
Tager imod sunde frivillige
Ingen
Køn, der er berettiget til at studere
Alle
Prøveudtagningsmetode
Ikke-sandsynlighedsprøve
Studiebefolkning
Healthy smokers
Beskrivelse
Inclusion Criteria:
- Adult males or females
- Regular smoking of at least 10 cigarettes, excluding ultra-low nicotine cigarettes, per day for at least two years
- Score on the Fagerstrom Test for Nicotine Dependence of 4 or more
- No intention to quit or reduce tobacco use, and no treatment for tobacco dependence currently
- No history of abuse of or dependence on any other drug, defined by DSM-IV criteria
Exclusion Criteria:
- Pregnancy
- Presence of metal objects in the body or implanted electronic devices, that preclude safe MR scanning
- Claustrophobia
- Cardiovascular or cerebrovascular diseases
- Major psychiatric disorders including mood, anxiety or psychotic disorders
- History of or current neurological illnesses including seizure disorders, migraine, multiple sclerosis, movement disorders, head trauma, CVA or CNS tumor
- Gross structural brain abnormalities as revealed by T1 weighted images
- Current use or use during the previous month of medication that may affect the CNS (e.g. neuroleptics, bupropion)
- Learning disability, amnesia or other conditions that impede memory and attention
Studieplan
Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
Kohorter og interventioner
Gruppe / kohorte |
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Healthy smokers
Healthy male and female smokers.
Each subject will undergo PET scan (along with craving and anxiety questionnaires) on two conditions - Smoking and Non-smoking - on two separate visits.
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Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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[11C]-(+)-PHNO binding potential
Tidsramme: Up to 14 days between PET scans
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The process of imaging requires the injection of a positron-emitting radiotracer (here, [11C]-(+)-PHNO) that binds to the protein of interest (here, dopamine receptor DRD2/3) followed by the measurement of this binding using the PET scanner.
Dopamine release increases DRD 2/3 occcupancy which results in decreased radiotracer's binding potential, and vice versa.
[11C]-(+)-PHNO binding potential will be measured on two different conditions (Smoking vs. Non-smoking) on two separate days.
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Up to 14 days between PET scans
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Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
|---|---|---|
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Subjective reports of craving
Tidsramme: Up to 14 days between PET scans
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Levels of subjective craving will be assessed prior to and after each condition (Smoking vs. Non-smoking) on two separate days.
Minnesota Nicotine Withdrawal Scale, Tiffany Questionnaire of Smoking Urges, The Urge to Smoke scale, Tobacco Craving Questionnaire, and 21-item Visual Analogue Scale will be used.
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Up to 14 days between PET scans
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Subjective reports of anxiety
Tidsramme: Up to 14 days between PET scans
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Subjective reports of anxiety will be collected prior to and after each condition (Smoking vs. Non-smoking) on two separate days.
State anxiety questions from the Spielberg State-Trait Anxiety Inventory will be used.
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Up to 14 days between PET scans
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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: Bernard Le Foll, MD, Centre for Addiction and Mental Health
Publikationer og nyttige links
Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.
Generelle publikationer
- Brody AL, Olmstead RE, London ED, Farahi J, Meyer JH, Grossman P, Lee GS, Huang J, Hahn EL, Mandelkern MA. Smoking-induced ventral striatum dopamine release. Am J Psychiatry. 2004 Jul;161(7):1211-8. doi: 10.1176/appi.ajp.161.7.1211.
- Wilson AA, McCormick P, Kapur S, Willeit M, Garcia A, Hussey D, Houle S, Seeman P, Ginovart N. Radiosynthesis and evaluation of [11C]-(+)-4-propyl-3,4,4a,5,6,10b-hexahydro-2H-naphtho[1,2-b][1,4]oxazin-9-ol as a potential radiotracer for in vivo imaging of the dopamine D2 high-affinity state with positron emission tomography. J Med Chem. 2005 Jun 16;48(12):4153-60. doi: 10.1021/jm050155n.
- Le Foll B, Goldberg SR, Sokoloff P. The dopamine D3 receptor and drug dependence: effects on reward or beyond? Neuropharmacology. 2005 Sep;49(4):525-41. doi: 10.1016/j.neuropharm.2005.04.022.
- Le Foll B, Schwartz JC, Sokoloff P. Dopamine D3 receptor agents as potential new medications for drug addiction. Eur Psychiatry. 2000 Mar;15(2):140-6. doi: 10.1016/s0924-9338(00)00219-4.
- Le Foll B, Goldberg SR, Sokoloff P. Dopamine D3 receptor ligands for the treatment of tobacco dependence. Expert Opin Investig Drugs. 2007 Jan;16(1):45-57. doi: 10.1517/13543784.16.1.45.
- Brody AL, Mandelkern MA, Olmstead RE, Scheibal D, Hahn E, Shiraga S, Zamora-Paja E, Farahi J, Saxena S, London ED, McCracken JT. Gene variants of brain dopamine pathways and smoking-induced dopamine release in the ventral caudate/nucleus accumbens. Arch Gen Psychiatry. 2006 Jul;63(7):808-16. doi: 10.1001/archpsyc.63.7.808.
- Boileau I, Guttman M, Rusjan P, Adams JR, Houle S, Tong J, Hornykiewicz O, Furukawa Y, Wilson AA, Kapur S, Kish SJ. Decreased binding of the D3 dopamine receptor-preferring ligand [11C]-(+)-PHNO in drug-naive Parkinson's disease. Brain. 2009 May;132(Pt 5):1366-75. doi: 10.1093/brain/awn337. Epub 2009 Jan 19.
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. februar 2011
Primær færdiggørelse (Faktiske)
1. februar 2013
Studieafslutning (Faktiske)
1. marts 2013
Datoer for studieregistrering
Først indsendt
22. februar 2011
Først indsendt, der opfyldte QC-kriterier
22. februar 2011
Først opslået (Skøn)
24. februar 2011
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
5. marts 2013
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
4. marts 2013
Sidst verificeret
1. marts 2013
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
Andre undersøgelses-id-numre
- 143/2010
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 .