BACKGROUND: Specific binding to dopamine transporters may serve as a tool to detect early loss of nigrostriatal dopaminergic neurons in patients with Parkinson's disease. OBJECTIVE: To determine striatal dopamine transporter binding using the cocaine analogue [I-123]N-(3-iodopropen-2-yl)-2beta-carbomethoxy-3beta-(4-chl orophenyl) tropane ([I-123]IPT) and single photon emission computed tomography. PATIENTS AND METHODS: We studied 9 control subjects (mean age, 58 years; range, 41-69 years) and 28 patients with early Parkinson's disease (Hoehn and Yahr stages I [n = 14] and II [n = 14] [symptom duration, <5 years]; mean age, 55.5 years; range, 36-71 years). Single photon emission computed tomography was performed 90 minutes after injection of 120 to 150 MBq of radioactive [I-123]IPT. RESULTS: Specific striatal [I-123] IPT binding (mean +/- SD) was significantly reduced in patients with early Parkinson's disease (ipsilateral striatum: 4.09+/-0.97; range, 2.46-6.40; contralateral striatum: 3.32+/-0.76; range, 1.80-5.13) compared with controls (left striatum: 7.28+/-0.94; range, 5.78-8.81; right striatum: 7.41+/-1.28; range, 5.58-9.44). IPT binding ratios (mean +/- SD) were significantly lower in patients with Hoehn and Yahr stage II (ipsilateral striatum: 3.47+/-0.75; contralateral striatum: 2.96+/-0.73) compared with those with Hoehn and Yahr stage I (ipsilateral striatum: 4.72+/-0.75; contralateral striatum: 3.69+/-0.61) (P<.001). The ipsilateral striatum of patients with Hoehn and Yahr stage I showed a significant mean+/-SD reduction of IPT binding (ipsilateral striatum: 4.72+/-0.75) compared with either right or left striatum of controls (P<.001). Only in 1 patient was IPT binding to the ipsilateral striatum (ratio, 6.40) higher than the lowest value observed in the striatum of a control subject (ratio, 5.58). CONCLUSIONS: Use of [I-123] IPT and single photon emission computed tomography demonstrates a reduction of dopamine transporter binding in patients with early Parkinson's disease. Significantly reduced IPT binding already observed in the ipsilateral striatum of patients with Hoehn and Yahr stage I demonstrates the potential of this method to detect preclinical disease.
BACKGROUND: Specific binding to dopamine transporters may serve as a tool to detect early loss of nigrostriatal dopaminergic neurons in patients with Parkinson's disease. OBJECTIVE: To determine striatal dopamine transporter binding using the cocaine analogue [I-123]N-(3-iodopropen-2-yl)-2beta-carbomethoxy-3beta-(4-chl orophenyl) tropane ([I-123]IPT) and single photon emission computed tomography. PATIENTS AND METHODS: We studied 9 control subjects (mean age, 58 years; range, 41-69 years) and 28 patients with early Parkinson's disease (Hoehn and Yahr stages I [n = 14] and II [n = 14] [symptom duration, <5 years]; mean age, 55.5 years; range, 36-71 years). Single photon emission computed tomography was performed 90 minutes after injection of 120 to 150 MBq of radioactive [I-123]IPT. RESULTS: Specific striatal [I-123] IPT binding (mean +/- SD) was significantly reduced in patients with early Parkinson's disease (ipsilateral striatum: 4.09+/-0.97; range, 2.46-6.40; contralateral striatum: 3.32+/-0.76; range, 1.80-5.13) compared with controls (left striatum: 7.28+/-0.94; range, 5.78-8.81; right striatum: 7.41+/-1.28; range, 5.58-9.44). IPT binding ratios (mean +/- SD) were significantly lower in patients with Hoehn and Yahr stage II (ipsilateral striatum: 3.47+/-0.75; contralateral striatum: 2.96+/-0.73) compared with those with Hoehn and Yahr stage I (ipsilateral striatum: 4.72+/-0.75; contralateral striatum: 3.69+/-0.61) (P<.001). The ipsilateral striatum of patients with Hoehn and Yahr stage I showed a significant mean+/-SD reduction of IPT binding (ipsilateral striatum: 4.72+/-0.75) compared with either right or left striatum of controls (P<.001). Only in 1 patient was IPT binding to the ipsilateral striatum (ratio, 6.40) higher than the lowest value observed in the striatum of a control subject (ratio, 5.58). CONCLUSIONS: Use of [I-123] IPT and single photon emission computed tomography demonstrates a reduction of dopamine transporter binding in patients with early Parkinson's disease. Significantly reduced IPT binding already observed in the ipsilateral striatum of patients with Hoehn and Yahr stage I demonstrates the potential of this method to detect preclinical disease.
Authors: S Hesse; C Oehlwein; H Barthel; J Schwarz; D Polster; A Wagner; O Sabri Journal: J Neural Transm (Vienna) Date: 2006-02-06 Impact factor: 3.575
Authors: Patricia Garrido-Vásquez; Marc D Pell; Silke Paulmann; Karl Strecker; Johannes Schwarz; Sonja A Kotz Journal: Soc Cogn Affect Neurosci Date: 2012-09-05 Impact factor: 3.436
Authors: C Pellicano; F R Buttarelli; A Circella; D Tiple; M Giovannelli; D Benincasa; C Colosimo; F E Pontieri Journal: J Neural Transm (Vienna) Date: 2007-01-29 Impact factor: 3.850
Authors: Annemarie M M Vlaar; Marinus J P G van Kroonenburgh; Alfons G H Kessels; Wim E J Weber Journal: BMC Neurol Date: 2007-09-01 Impact factor: 2.474