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• W2111491695 abstract "Translocator protein (TSPO) is a promising biomarker for neuroinflammation. We developed two new PET ligands, 18F-PBR06 and 11C-PBR28, to image TSPOs. Although our prior studies suggest that either of the two ligands could be used to quantify TSPOs in human brain, the studies were done in different sets of subjects. In this study, we directly compared 18F-PBR06 and 11C-PBR28 in eight human subjects to determine (1) whether either ligand provides more precise measurements of TSPOs and (2) whether the higher in vitro affinity of PBR06 compared to PBR28 led to higher in vivo binding of 18F-PBR06 compared to 11C-PBR28. In vivo binding was calculated as total distribution volume (V T), using an unconstrained two-tissue compartment model. V T was corrected for plasma free fraction (f P) to measure ligand binding based on free ligand concentration in brain. Both ligands measured V T with similar precision, as evidenced by similarly good identifiability. However, V T for both radioligands increased with increasing lengths of data acquisition, consistent with the accumulation of radiometabolites in brain. Despite its higher lipophilicity and higher in vitro affinity, V T/f P of 18F-PBR06 was similar to that of 11C-PBR28. Both 18F-PBR06 and 11C-PBR28 are similar in terms of precision, sensitivity to accumulation of radiometabolites, and magnitude of in vivo binding. Thus, selection between the two radioligands will be primarily determined by the logistical impact of the different half-lives of the two radionuclides (110 vs 20 min)." @default.
• W2111491695 created "2016-06-24" @default.
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• W2111491695 date "2010-11-18" @default.
• W2111491695 modified "2023-09-27" @default.
• W2111491695 title "Comparison of 18F- and 11C-labeled aryloxyanilide analogs to measure translocator protein in human brain using positron emission tomography" @default.
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• W2111491695 doi "https://doi.org/10.1007/s00259-010-1622-y" @default.
• W2111491695 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3159870" @default.
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