[11°C]GMOM (carbon-11 labeled N-(2-chloro-5-thiomethylphenyl)-N′-(3-[11°C]methoxy-phenyl)-N′-methylguanidine) is a PET ligand that binds to the N-methyl-d-aspartate receptor with high specificity and affinity. The purpose of this first in human study was to evaluate kinetics of [11°C]GMOM in the healthy human brain and to identify the optimal pharmacokinetic model for quantifying these kinetics, both before and after a pharmacological dose of S-ketamine. Dynamic 90 min [11°C]GMOM PET scans were obtained from 10 subjects. In six of the 10 subjects, a second PET scan was performed following an S-ketamine challenge. Metabolite corrected plasma input functions were obtained for all scans. Regional time activity curves were fitted to various single-and two-tissue compartment models. Best fits were obtained using a two-tissue irreversible model with blood volume parameter. The highest net influx rate (K i) of [11°C]GMOM was observed in regions with high N-methyl-d-aspartate receptor density, such as hippocampus and thalamus. A significant reduction in the K i was observed for the entire brain after administration of ketamine, suggesting specific binding to the N-methyl-d-aspartate receptors. This initial study suggests that the [11°C]GMOM could be used for quantification of N-methyl-d-aspartate receptors.
CITATION STYLE
Van Der Doef, T. F., Golla, S. S. V., Klein, P. J., Oropeza-Seguias, G. M., Schuit, R. C., Metaxas, A., … Boellaard, R. (2016). Quantification of the novel N-methyl-d-aspartate receptor ligand [11°C]GMOM in man. Journal of Cerebral Blood Flow and Metabolism, 36(6), 1111–1121. https://doi.org/10.1177/0271678X15608391
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