Abstract:
PURPOSE:Imaging the 18-kDa translocator protein (TSPO) is considered a potential tool for in vivo evaluation of microglial activation and neuroinflammation in the early stages of Alzheimer's disease (AD). ((R)-1-(2-chlorophenyl)-N-[(11)C]-methyl-N-(1-methylpropyl)-3-isoquinoline caboxamide ([(11)C]-(R)-PK11195) has been widely used for PET imaging of TSPO and, despite its low specific-to-nondisplaceable binding ratio, increased TSPO binding has been shown in AD patients. The high-affinity radioligand N-(5-fluoro-2-phenoxyphenyl)-N-(2-[(18)F]fluoroethyl-5-methoxybenzyl)acetamide ([(18)F]FEDAA1106) has been developed as a potential in vivo imaging tool for better quantification of TSPO binding. The aim of this study was to quantify in vivo binding of [(18)F]FEDAA1106 to TSPO in control subjects and AD patients. METHODS:Seven controls (five men, two women, age 68±3 years, MMSE score 29±1) and nine AD patients (six men, three women, age 69±4 years, MMSE score 25±3) were studied with [(18)F]FEDAA1106. PET measurements were performed on an ECAT EXACT HR system (Siemens Medical Solutions) in two 60-min dynamic PET sessions with a 30-min interval between sessions. Arterial blood radioactivity was measured using an automated blood sampling system for the first 5 min and using manually drawn samples thereafter. Quantification was performed using both kinetic analysis based on a two-tissue compartment model and Logan graphical analysis. Outcome measures were total distribution volume (V T) and binding potential (BP(ND)=k3/k4). An estimate of nondisplaceable distribution volume was obtained with the Logan graphical analysis using the first 15 min of PET measurements (V(ND 1-15 min)). Binding potential (BP(ND)) was also calculated as: V(T)/V(ND 1-15 min) - 1. RESULTS:No statistically significant differences in V(T), k3/k4 or BP(ND) were observed between controls and AD patients. CONCLUSION:This study suggests that TSPO imaging with [(18)F]FEDAA1106 does not enable the detection of microglial activation in AD.
journal_name
Eur J Nucl Med Mol Imagingauthors
Varrone A,Mattsson P,Forsberg A,Takano A,Nag S,Gulyás B,Borg J,Boellaard R,Al-Tawil N,Eriksdotter M,Zimmermann T,Schultze-Mosgau M,Thiele A,Hoffmann A,Lammertsma AA,Halldin Cdoi
10.1007/s00259-013-2359-1subject
Has Abstractpub_date
2013-06-01 00:00:00pages
921-31issue
6eissn
1619-7070issn
1619-7089journal_volume
40pub_type
杂志文章abstract::In locally advanced head and neck squamous cell carcinoma (HNSCC), the role of imaging becomes more and more critical in the management process. In this framework, molecular imaging techniques such as PET allow noninvasive assessment of a range of tumour biomarkers such as metabolism, hypoxia and proliferation, which ...
journal_title:European journal of nuclear medicine and molecular imaging
pub_type: 杂志文章,评审
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journal_title:European journal of nuclear medicine and molecular imaging
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journal_title:European journal of nuclear medicine and molecular imaging
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pub_type: 临床试验,杂志文章
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更新日期:2017-10-01 00:00:00