Time course of changes in striatal dopamine transporters and D2 receptors with specific iodinated markers in a rat model of Parkinson's disease
- 1 February 1999
- Vol. 31 (2) , 134-139
- https://doi.org/10.1002/(sici)1098-2396(199902)31:2<134::aid-syn6>3.0.co;2-v
Abstract
The time course of the loss in presynaptic dopamine transporters (DAT) and of the increase in postsynaptic dopamine D2 receptors (D2R) was studied in a rat model of Parkinson's disease. For this, in vitro autoradiographic experiments were performed in the striatum using (E)‐N‐(3‐iodoprop‐2‐enyl)‐2β‐carbomethoxy‐3β‐(4′‐methylphenyl) nortropane (PE2I), a new single photon emission tomography (SPET) ligand for DAT, and iodobenzamide (IBZM), a SPET ligand for D2R. A significant decrease in [125I]PE2I binding was observed as early as 24 h after 6‐hydroxydopamine lesion, whereas no change occurred in [125I]IBZM binding. At 48 h postlesion, PE2I binding was 50% decreased, while IBZM binding was 30% increased. Between 3 and 14 days postlesion, PE2I binding had almost totally disappeared and IBZM binding remained increased by around 40–50%. From these animal experiments, it can be assumed that PE2I would be very efficient for the detection of a reduction in the number of DAT reflecting neuronal loss, thus allowing early diagnosis of Parkinson's disease. The exploration of both DAT and D2R would improve follow‐up of this disease. Synapse 31:134–139, 1999.Keywords
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