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Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride

OBJECTIVES: Positron emission tomography (PET) with [(11)C]raclopride has been applied to measure changes in the concentration of endogenous dopamine induced by pharmacological challenge or neuropsychological stimulation by evaluating the binding potential (BP) between the baseline and activated sta...

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Autores principales: Ikoma, Yoko, Kimura, Yasuyuki, Yamada, Makiko, Obata, Takayuki, Suhara, Tetsuya, Ito, Hiroshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9314751/
https://www.ncbi.nlm.nih.gov/pubmed/35903633
http://dx.doi.org/10.3389/fpsyt.2022.811136
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author Ikoma, Yoko
Kimura, Yasuyuki
Yamada, Makiko
Obata, Takayuki
Suhara, Tetsuya
Ito, Hiroshi
author_facet Ikoma, Yoko
Kimura, Yasuyuki
Yamada, Makiko
Obata, Takayuki
Suhara, Tetsuya
Ito, Hiroshi
author_sort Ikoma, Yoko
collection PubMed
description OBJECTIVES: Positron emission tomography (PET) with [(11)C]raclopride has been applied to measure changes in the concentration of endogenous dopamine induced by pharmacological challenge or neuropsychological stimulation by evaluating the binding potential (BP) between the baseline and activated state. Recently, to reliably estimate BP in the activated state, a new approach with dual-bolus injections in a single PET scan was developed. In this study, we investigated the feasibility of applying this dual-bolus injection approach to measure changes in endogenous dopamine levels induced by cognitive tasks in humans. METHODS: First, the reproducibility of BP estimation using the dual-bolus injection approach was evaluated using PET scans without stimulation in nine healthy volunteers. A 90-min scan was performed with bolus injections of [(11)C]raclopride administered at the beginning of the scan and 45 min after the first injection. BPs in the striatum for the first injection (BP(1)) and second injection (BP(2)) were estimated using an extended simplified reference tissue model, and the mean absolute difference (MAD) between the two BPs was calculated. The MAD was also compared with the conventional bolus-plus-continuous infusion approach. Next, PET studies with a cognitive reinforcement learning task were performed on 10 healthy volunteers using the dual-bolus injection approach. The BP(1) at baseline and BP(2) at the activated state were estimated, and the reduction in BP was evaluated. RESULTS: In the PET scans without stimulation, the dual-bolus injection approach showed a smaller MAD (<2%) between BP(1) and BP(2) than the bolus-plus-continuous infusion approach, demonstrating good reproducibility of this approach. In the PET scans with the cognitive task performance, the reduction in BP was not observed in the striatum by either approach, showing that the changes in dopamine level induced by the cognitive tasks performed in this study were not sufficient to be detected by PET. CONCLUSION: Our results indicate that the cognitive task-induced changes in dopamine-related systems may be complex and difficult to measure accurately using PET scans. However, the proposed dual-bolus injection approach provided reliable BP estimates with high reproducibility, suggesting that it has the potential to improve the accuracy of PET scans for measuring changes in dopamine concentrations.
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spelling pubmed-93147512022-07-27 Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride Ikoma, Yoko Kimura, Yasuyuki Yamada, Makiko Obata, Takayuki Suhara, Tetsuya Ito, Hiroshi Front Psychiatry Psychiatry OBJECTIVES: Positron emission tomography (PET) with [(11)C]raclopride has been applied to measure changes in the concentration of endogenous dopamine induced by pharmacological challenge or neuropsychological stimulation by evaluating the binding potential (BP) between the baseline and activated state. Recently, to reliably estimate BP in the activated state, a new approach with dual-bolus injections in a single PET scan was developed. In this study, we investigated the feasibility of applying this dual-bolus injection approach to measure changes in endogenous dopamine levels induced by cognitive tasks in humans. METHODS: First, the reproducibility of BP estimation using the dual-bolus injection approach was evaluated using PET scans without stimulation in nine healthy volunteers. A 90-min scan was performed with bolus injections of [(11)C]raclopride administered at the beginning of the scan and 45 min after the first injection. BPs in the striatum for the first injection (BP(1)) and second injection (BP(2)) were estimated using an extended simplified reference tissue model, and the mean absolute difference (MAD) between the two BPs was calculated. The MAD was also compared with the conventional bolus-plus-continuous infusion approach. Next, PET studies with a cognitive reinforcement learning task were performed on 10 healthy volunteers using the dual-bolus injection approach. The BP(1) at baseline and BP(2) at the activated state were estimated, and the reduction in BP was evaluated. RESULTS: In the PET scans without stimulation, the dual-bolus injection approach showed a smaller MAD (<2%) between BP(1) and BP(2) than the bolus-plus-continuous infusion approach, demonstrating good reproducibility of this approach. In the PET scans with the cognitive task performance, the reduction in BP was not observed in the striatum by either approach, showing that the changes in dopamine level induced by the cognitive tasks performed in this study were not sufficient to be detected by PET. CONCLUSION: Our results indicate that the cognitive task-induced changes in dopamine-related systems may be complex and difficult to measure accurately using PET scans. However, the proposed dual-bolus injection approach provided reliable BP estimates with high reproducibility, suggesting that it has the potential to improve the accuracy of PET scans for measuring changes in dopamine concentrations. Frontiers Media S.A. 2022-07-12 /pmc/articles/PMC9314751/ /pubmed/35903633 http://dx.doi.org/10.3389/fpsyt.2022.811136 Text en Copyright © 2022 Ikoma, Kimura, Yamada, Obata, Suhara and Ito. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Psychiatry
Ikoma, Yoko
Kimura, Yasuyuki
Yamada, Makiko
Obata, Takayuki
Suhara, Tetsuya
Ito, Hiroshi
Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title_full Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title_fullStr Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title_full_unstemmed Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title_short Measurement of Striatal Dopamine Release Induced by Neuropsychological Stimulation in Positron Emission Tomography With Dual Injections of [(11)C]Raclopride
title_sort measurement of striatal dopamine release induced by neuropsychological stimulation in positron emission tomography with dual injections of [(11)c]raclopride
topic Psychiatry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9314751/
https://www.ncbi.nlm.nih.gov/pubmed/35903633
http://dx.doi.org/10.3389/fpsyt.2022.811136
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