Quantification of the novel N-methyl-D-aspartate receptor ligand [11C]GMOM in man
Creators
- 1. Department of Radiology & Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands and Department of Psychiatry, University Medical Center Utrecht, Utrecht, The Netherlands
- 2. Department of Radiology & Nuclear Medicine, VU University Medical Center, Amsterdam, The Netherlands
- 3. Department of Anesthesiology, VU University Medical Center, Amsterdam, The Netherlands
Description
[11C]GMOM (carbon-11 labeled N-(2-chloro-5-thiomethylphenyl)-N0-(3-[11C]methoxy-phenyl)-N0-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 [11C]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 [11C]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 (Ki) of [11C]GMOM was observed in regions with high N-methyl-D-aspartate receptor density, such as hippocampus and thalamus.
A significant reduction in the Ki 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 [11C]GMOM could be used for quantification of N-methyl-D-aspartate receptors.
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van_der_Doef_JCerebBloodFlowMetab_2015-P9.pdf
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