A PET Study in Healthy Volunteers
A Positron Emission Tomography Study in Healthy Male Subjects to Examine the Test-retest Reliability of the D2/3 Agonist Radiotracer [11C]PHNO
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Detaljeret beskrivelse
A test-retest (TRT) investigation of [11C]PHNO in human is required to further characterise [11C]PHNO. [11C] PHNO possesses very high affinity for the D3 receptor, and therefore most clinical studies are conducted at D3 occupancies >10%. As [11C]PHNO kinetics in the target brain regions are moderately slow, considerable mass carry over may be present on a 2nd PET scan conducted on the same day. In addition there appears to be a significant displaceable binding component in the cerebellum, which, if not accounted for, will lead to a bias in the quantification of specific [11C]PHNO binding. The aim of this study is therefore to examine the effects of [11C]PHNO mass carry-over and displaceable binding in the cerebellum, on the quantification of [11C]PHNO PET data.
This will be an open label, non-randomised [11C]PHNO PET study using healthy volunteers. Each volunteer will undergo 4 [11C]PHNO PET scans:
1st and 2nd scans; TRT on the same day with a minimal gap between [11C]PHNO injections to examine the effects of PHNO mass carry over, 3rd scan >1 week later to determine the "true" TRT variability and a 4th scan will follow a 15mg dose of aripiprazole (a D2/D3 compound which allows the highest clinically acceptable blockade of central D2/D3 receptors) and will examine the amount of displaceable binding in the cerebellum, a proposed reference tissue for [11C]PHNO.
The scan data will be quantified as regional volumes of distribution (VT).
Undersøgelsestype
Undersøgelsestype
Tilmelding (Faktiske)
Tilmelding
Fase
Fase
- Fase 1
Kontakter og lokationer
Studiesteder
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London, Det Forenede Kongerige, W12 ONN
- GSK Investigational Site
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Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
Inclusion Criteria:
- Healthy as determined by a responsible physician
- Male subjects between 25 and 55 years of age.
- Male subjects must agree to use one of the contraception methods listed
- Capable of giving written informed consent
Exclusion Criteria:
- The subject has a positive pre-study drug/alcohol screen
- The subjects is using or has used regular prescription or non-prescription drugs
- Current or recent (within one year) gastrointestinal disease
- A screening ECG with a QTc value of >450msec and/or a PR interval outside the range 120 to 200msec or an ECG that is not suitable for QT measurements
- Pulse rate <50 or >100 bpm OR a systolic blood pressure >140 or <100 OR a diastolic blood pressure >90 or <60.
- History of long QT syndrome (personal or family) or other cardiac conduction disorder, or other clinically significant cardiac disease.
- Any previous or current psychiatric diagnosis listed in DSM-IV Axis I or II
- Any history of suicidal attempts, suicidal ideation or behaviour as assessed by appropriately trained study personnel.
- History of alcohol dependence
- The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).
- Exposure to more than four new chemical entities within 12 months prior to the first dosing day.
- History of sensitivity to any of the study medications, or components thereof or a history of drug or other allergy that, in the opinion of the investigator or GSK Medical Monitor, contraindicates their participation.
- Where participation in the study would result in donation of blood or blood products in excess of 550 mL within a 56 day period.
- Previous inclusion in a research and/or medical protocol involving nuclear medicine, PET or radiological investigations with significant radiation burden
- Family history of cancer
- History of claustrophobia or subjects feeling that he will be unable to lie still on his back in the PET camera for a period of ~2 hours at a time.
- History or presence of a neurological diagnosis
- Presence of a cardiac pacemaker or other electronic device or ferromagnetic metal foreign bodies as assessed by a standard pre-MRI questionnaire.
- Unwillingness or inability to follow the procedures outlined in the protocol. -
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Tildeling: N/A
- Interventionel model: Enkelt gruppeopgave
- Maskning: Ingen (Åben etiket)
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / Behandling |
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Eksperimentel: no treatment
Aripiprazole is a D2/D3 antagonist registered in the UK for use in the treatment of schizophrenia.
It allows the highest clinically acceptable blockade of central D2/D3 receptors and will allow us to examine the amount of displaceable binding in the brain - a proposed reference tissue for [11C]PHNO.
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examine the effects of [11C]PHNO mass carry-over and displaceable binding
A 4th scan will follow a 15mg dose of aripiprazole (a D2/D3 compound which allows the highest clinically acceptable blockade of central D2/D3 receptors)
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Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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volume of distribution
Tidsramme: one year
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Regional volume of distribution (VT) in sub-cortical, brainstem and cerebellar regions of interest at each PET scan.
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one year
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Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Datoer for undersøgelser
Studer store datoer
Studiestart
Studiestart
Primær færdiggørelse (Faktiske)
Primær færdiggørelse
Studieafslutning (Faktiske)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
- Psykiske lidelser
- Stemningsforstyrrelser
- Depressiv lidelse
- Lægemidlers fysiologiske virkninger
- Neurotransmittermidler
- Molekylære mekanismer for farmakologisk virkning
- Depressive midler til centralnervesystemet
- Antipsykotiske midler
- Beroligende midler
- Psykotropiske stoffer
- Serotoninmidler
- Antidepressive midler
- Dopaminagonister
- Dopaminmidler
- Serotonin 5-HT1-receptoragonister
- Serotoninreceptoragonister
- Serotonin 5-HT2-receptorantagonister
- Serotonin-antagonister
- Dopamin D2-receptorantagonister
- Dopamin-antagonister
- Aripiprazol
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- 113549
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