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• W2078261768 abstract "In vivo small animal imaging of the dopaminergic system is of great interest for basic and applied neurosciences, especially in transgenic mice. Small animal SPECT is particularly attractive because of its superior spatial resolution and tracer availability. We investigated the kinetics of the commercial dopamine D2 receptor (DZR) ligand [123I]IBZM in mice as a prerequisite for an appropriate design of translational SPECT imaging between mice and humans. Cerebral kinetics of [123I]IBZM under isoflurane anaesthesia were assessed by autoradiography in mice sacrificed at 30, 60, 120 and 200 min after iv injection. To explore the possible effects of isoflurane anaesthesia, an additional mice group was only anaesthetized for 20 min before being sacrificed at 140 min (putative time of single-scan SPECT analysis). Maximum [123I]IBZM uptake in the striatum (D2R-rich; 10.5±2.7 %ID/g) and cerebellum (D2R-devoid; 2.4±0.7 %ID/g) was observed at 30 min after injection. Thereafter, [123I]IBZM uptake decreased slowly in striatum and rapidly in the cerebellum (200 min: 5.3±1.9 and 0.4±0.2 %ID/g, respectively). The striatum-to-cerebellum (S/C) [123I]IBZM uptake ratio increased from 4.6±1.2 at 30 min to 11.6±2.6 at 120 min. The S/C ratio at 200 min was highly variable (17.8±10.1), possibly indicating pseudo-equilibration in some animals. In mice, which were only anaesthetized between 120 and 140 min, a higher S/C ratio of 17.0±5.1 was observed. The present study suggests that [123I]IBZM is a suitable ligand for D2R-SPECT in mice. Although a single-scan analysis may be a pragmatic semi-quantitative approach, tracer kinetic analyses on dynamic SPECT data should be pursued. The interfering effects of isoflurane anaesthesia need to be considered." @default.
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• W2078261768 date "2008-05-01" @default.
• W2078261768 modified "2023-09-26" @default.
• W2078261768 title "Cerebral kinetics of the dopamine D2 receptor ligand [123I]IBZM in mice" @default.
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• W2078261768 doi "https://doi.org/10.1016/j.nucmedbio.2008.01.002" @default.
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