Vidya Narayanaswami et al., Springer Open EJNMMI Radiopharmacy and Chemistry, 2020
Clinical importance of 5-HT1A receptors in the pathogenesis of several psychiatric and neurodegenerative disorders has promoted development of carbon-11 and fluorine-18 labeled radiotracers for in vivo positron emission tomography (PET). The gold standard PET imaging agent limited its widespread use.
The purpose of the current study was to develop and characterize a radioligand with suitable characteristics for imaging 5-HT1A receptors in the brain. The authors have reported the in vitro pharmacological characterization, radiosynthesis and preliminary in vivo PET imaging of three new 5-HT1A receptor arylpiperazine based ligands in rats (DF-100 (1), DF-300 (2) and DF-400 (3)).
They concluded DF-400 represents a promising O-methylated lead candidate which if subjected to structural alterations, may either lead to improved selectivity for 5-HT1A receptors or may assist in the development of the first PET radioligand for α1-adrenergic receptors.
Results from nanoScan PET/MRI 3T
Fig. 2 Uptake of [11C]3 (a); [11C]2 (b) and [11C]1 (c) in rat brain. Shown are TACs averaged for left and right brain (A: n = 3; B and C: n = 1) in SUV and summed (0–60 min) PET images in coronal, transverse and sagittal planes, respectively, through the thalamus. The spatially co-registered MR images (2D fast spin echo) show left-half ROIs including thalamus (blue), anterior cingulate cortex (red), hippocampus (green) and cerebellum (magenta) for the corresponding color-coded TACs
Fig. 2 Blocking of the uptake of [11C]3 in rat brain by WAY-100635 (a) and prazosin (b). Shown are TACs, averaged for left and right brain, (n = 1; solid: baseline; dashed: blocking) in SUV and summed (0–60 min) PET images in coronal, transverse and sagittal planes, respectively, through the thalamus at baseline and under blocking conditions. The three depicted left-half ROIs include thalamus (orange), hippocampus (red) and cerebellum (magenta) for the corresponding color-coded TACs
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