- ICH GCP
- Amerikanska kliniska prövningsregistret
- Klinisk prövning NCT00547976
PET Imaging of Peripheral Benzodiazepine Receptors in Patients With Carotid Atherosclerosis
Studieöversikt
Detaljerad beskrivning
Objective
Inflammation in the vascular wall plays an important role in the pathophysiology of atherosclerosis, including development of plaque, plaque destabilization and rupture. Clinical and basic scientific data demonstrate the importance of peripheral white blood cells in this process. Therefore, a noninvasive method to detect inflammatory activity in atherosclerosis may be of great value to help determine prognosis, direct therapy and perhaps assess novel therapies for stabilization of atherosclerotic plaque.
The peripheral benzodiazepine receptor (PBR) is distinct from central benzodiazepine receptors associated with GABAA receptors and has been associated with immune function. PBR is expressed in macrophages, therefore, they may be a clinically useful marker to detect inflammation. Our preliminary autoradiographic data demonstrate specific PBR binding in carotid atherosclerosis samples. Though PBR has been imaged in vivo with positron emission tomography (PET) using [(11)C]1-(2-chlorophenyl-N-methylpropyl)-3-isoquinoline carboxamide (PK11195), we developed a new ligand, [(11)C]N-acetyl-N-(2-methoxybenzyl)-2-phenoxy-5-pyridinamine (PBR28) that shows greater specific signal than [(11)C]PK11195 in non-human primates.
The objective of this protocol is to assess the utility of [(11)C]PBR28 PET to detect inflammation in unstable atherosclerosis plaques and large vessels with inflammation.
Study population
Twenty patients with carotid atherosclerosis, 20 patients with large vessel vasculitis including Takayasu's and Giant Cell arteritis, and 20 age-matched healthy subjects will have one PET scan.
Design
A [(11)C]PBR28 PET scan and a [18 F] fluorodeoxyglucose (FDG) PET scan will be performed in patients with carotid atherosclerosis. If the patient has endarterectomy after the PET scan, endarterectomy samples will be evaluated by in vitro autoradiography using [3H]PK 11195 and immunohistological staining with macrophage markers. Patients with large vessel vasculitis and healthy subjects will also have a [(11)C]PBR28 PET scan [18 F]FDG PET scan.
Outcome measures
Binding of [(11)C]PBR28 in atherosclerotic lesions, aortic arch and its branches will be compared with the binding in the contralateral carotid artery and those in healthy subjects. Binding of [(11)C]PBR28 will also be compared with accumulation of [18 F]FDG in each region. In addition, if the patients with atherosclerosis have endarterectomy, the binding in the atherosclerotic lesions will be compared with immunohistological staining of macrophage markers.
Studietyp
Inskrivning (Faktisk)
Fas
- Fas 1
Kontakter och platser
Studieorter
-
-
Maryland
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Bethesda, Maryland, Förenta staterna, 20892
- National Institutes of Health Clinical Center, 9000 Rockville Pike
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Bethesda, Maryland, Förenta staterna, 20814
- Suburban Hospital
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-
Deltagandekriterier
Urvalskriterier
Åldrar som är berättigade till studier
Tar emot friska volontärer
Kön som är behöriga för studier
Beskrivning
- INCLUSION CRITERIA
Age 18 - 89
Ability to provide written informed consent
EXCLUSION CRITERIA
Severe systemic disease based on history, physical examination or laboratory tests that would prevent participation in the study
Prior participation in other research protocols in the last year such that radiation exposure would exceed the annual guideline of RSC
Pregnancy and breast feeding
Claustrophobia
Inability to lie flat for a few hours for the PET scans
Medically unstable
The blood glucose level is greater than 150 mg/dL after fasting
Any other condition which in the opinion of the PI would prevent satisfactory participation in and completion of the study.
Studieplan
Hur är studien utformad?
Designdetaljer
- Primärt syfte: Diagnostisk
- Tilldelning: Icke-randomiserad
- Interventionsmodell: Parallellt uppdrag
- Maskning: Ingen (Open Label)
Vad mäter studien?
Primära resultatmått
Resultatmått |
Tidsram |
---|---|
Binding of [11C]PBR28 at peripheral benzodiazepine receptor
Tidsram: 3 years
|
3 years
|
Sekundära resultatmått
Resultatmått |
Tidsram |
---|---|
PET [F-18]FDG uptake
Tidsram: 3 years
|
3 years
|
Samarbetspartners och utredare
Publikationer och användbara länkar
Allmänna publikationer
- Anholt RR, De Souza EB, Oster-Granite ML, Snyder SH. Peripheral-type benzodiazepine receptors: autoradiographic localization in whole-body sections of neonatal rats. J Pharmacol Exp Ther. 1985 May;233(2):517-26.
- Anholt RR, Murphy KM, Mack GE, Snyder SH. Peripheral-type benzodiazepine receptors in the central nervous system: localization to olfactory nerves. J Neurosci. 1984 Feb;4(2):593-603. doi: 10.1523/JNEUROSCI.04-02-00593.1984.
- Schollhammer R, Lepreux S, Barthe N, Vimont D, Rullier A, Sibon I, Berard X, Zhang A, Kimura Y, Fujita M, Innis RB, Zanotti-Fregonara P, Morgat C. In vitro and pilot in vivo imaging of 18 kDa translocator protein (TSPO) in inflammatory vascular disease. EJNMMI Res. 2021 May 5;11(1):45. doi: 10.1186/s13550-021-00786-7.
- Banati RB. Visualising microglial activation in vivo. Glia. 2002 Nov;40(2):206-217. doi: 10.1002/glia.10144.
Studieavstämningsdatum
Studera stora datum
Studiestart
Primärt slutförande (Faktisk)
Avslutad studie (Faktisk)
Studieregistreringsdatum
Först inskickad
Först inskickad som uppfyllde QC-kriterierna
Första postat (Uppskatta)
Uppdateringar av studier
Senaste uppdatering publicerad (Uppskatta)
Senaste inskickade uppdateringen som uppfyllde QC-kriterierna
Senast verifierad
Mer information
Termer relaterade till denna studie
Ytterligare relevanta MeSH-villkor
Andra studie-ID-nummer
- 080006
- 08-M-0006
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