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Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability

PURPOSE: The adenosine A(2A) receptor has emerged as a therapeutic target for multiple diseases, and thus the non-invasive imaging of the expression or occupancy of the A(2A) receptor has potential to contribute to diagnosis and drug development. We aimed at the development of a metabolically stable...

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Autores principales: Lai, Thu Hang, Toussaint, Magali, Teodoro, Rodrigo, Dukić-Stefanović, Sladjana, Gündel, Daniel, Ludwig, Friedrich-Alexander, Wenzel, Barbara, Schröder, Susann, Sattler, Bernhard, Moldovan, Rareş-Petru, Falkenburger, Björn H., Sabri, Osama, Deuther-Conrad, Winnie, Brust, Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8263428/
https://www.ncbi.nlm.nih.gov/pubmed/33532910
http://dx.doi.org/10.1007/s00259-020-05164-4
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author Lai, Thu Hang
Toussaint, Magali
Teodoro, Rodrigo
Dukić-Stefanović, Sladjana
Gündel, Daniel
Ludwig, Friedrich-Alexander
Wenzel, Barbara
Schröder, Susann
Sattler, Bernhard
Moldovan, Rareş-Petru
Falkenburger, Björn H.
Sabri, Osama
Deuther-Conrad, Winnie
Brust, Peter
author_facet Lai, Thu Hang
Toussaint, Magali
Teodoro, Rodrigo
Dukić-Stefanović, Sladjana
Gündel, Daniel
Ludwig, Friedrich-Alexander
Wenzel, Barbara
Schröder, Susann
Sattler, Bernhard
Moldovan, Rareş-Petru
Falkenburger, Björn H.
Sabri, Osama
Deuther-Conrad, Winnie
Brust, Peter
author_sort Lai, Thu Hang
collection PubMed
description PURPOSE: The adenosine A(2A) receptor has emerged as a therapeutic target for multiple diseases, and thus the non-invasive imaging of the expression or occupancy of the A(2A) receptor has potential to contribute to diagnosis and drug development. We aimed at the development of a metabolically stable A(2A) receptor radiotracer and report herein the preclinical evaluation of [(18)F]FLUDA, a deuterated isotopologue of [(18)F]FESCH. METHODS: [(18)F]FLUDA was synthesized by a two-step one-pot approach and evaluated in vitro by autoradiographic studies as well as in vivo by metabolism and dynamic PET/MRI studies in mice and piglets under baseline and blocking conditions. A single-dose toxicity study was performed in rats. RESULTS: [(18)F]FLUDA was obtained with a radiochemical yield of 19% and molar activities of 72–180 GBq/μmol. Autoradiography proved A(2A) receptor–specific accumulation of [(18)F]FLUDA in the striatum of a mouse and pig brain. In vivo evaluation in mice revealed improved stability of [(18)F]FLUDA compared to that of [(18)F]FESCH, resulting in the absence of brain-penetrant radiometabolites. Furthermore, the radiometabolites detected in piglets are expected to have a low tendency for brain penetration. PET/MRI studies confirmed high specific binding of [(18)F]FLUDA towards striatal A(2A) receptor with a maximum specific-to-non-specific binding ratio in mice of 8.3. The toxicity study revealed no adverse effects of FLUDA up to 30 μg/kg, ~ 4000-fold the dose applied in human PET studies using [(18)F]FLUDA. CONCLUSIONS: The new radiotracer [(18)F]FLUDA is suitable to detect the availability of the A(2A) receptor in the brain with high target specificity. It is regarded ready for human application. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00259-020-05164-4.
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spelling pubmed-82634282021-07-20 Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability Lai, Thu Hang Toussaint, Magali Teodoro, Rodrigo Dukić-Stefanović, Sladjana Gündel, Daniel Ludwig, Friedrich-Alexander Wenzel, Barbara Schröder, Susann Sattler, Bernhard Moldovan, Rareş-Petru Falkenburger, Björn H. Sabri, Osama Deuther-Conrad, Winnie Brust, Peter Eur J Nucl Med Mol Imaging Original Article PURPOSE: The adenosine A(2A) receptor has emerged as a therapeutic target for multiple diseases, and thus the non-invasive imaging of the expression or occupancy of the A(2A) receptor has potential to contribute to diagnosis and drug development. We aimed at the development of a metabolically stable A(2A) receptor radiotracer and report herein the preclinical evaluation of [(18)F]FLUDA, a deuterated isotopologue of [(18)F]FESCH. METHODS: [(18)F]FLUDA was synthesized by a two-step one-pot approach and evaluated in vitro by autoradiographic studies as well as in vivo by metabolism and dynamic PET/MRI studies in mice and piglets under baseline and blocking conditions. A single-dose toxicity study was performed in rats. RESULTS: [(18)F]FLUDA was obtained with a radiochemical yield of 19% and molar activities of 72–180 GBq/μmol. Autoradiography proved A(2A) receptor–specific accumulation of [(18)F]FLUDA in the striatum of a mouse and pig brain. In vivo evaluation in mice revealed improved stability of [(18)F]FLUDA compared to that of [(18)F]FESCH, resulting in the absence of brain-penetrant radiometabolites. Furthermore, the radiometabolites detected in piglets are expected to have a low tendency for brain penetration. PET/MRI studies confirmed high specific binding of [(18)F]FLUDA towards striatal A(2A) receptor with a maximum specific-to-non-specific binding ratio in mice of 8.3. The toxicity study revealed no adverse effects of FLUDA up to 30 μg/kg, ~ 4000-fold the dose applied in human PET studies using [(18)F]FLUDA. CONCLUSIONS: The new radiotracer [(18)F]FLUDA is suitable to detect the availability of the A(2A) receptor in the brain with high target specificity. It is regarded ready for human application. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00259-020-05164-4. Springer Berlin Heidelberg 2021-02-02 2021 /pmc/articles/PMC8263428/ /pubmed/33532910 http://dx.doi.org/10.1007/s00259-020-05164-4 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Article
Lai, Thu Hang
Toussaint, Magali
Teodoro, Rodrigo
Dukić-Stefanović, Sladjana
Gündel, Daniel
Ludwig, Friedrich-Alexander
Wenzel, Barbara
Schröder, Susann
Sattler, Bernhard
Moldovan, Rareş-Petru
Falkenburger, Björn H.
Sabri, Osama
Deuther-Conrad, Winnie
Brust, Peter
Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title_full Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title_fullStr Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title_full_unstemmed Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title_short Improved in vivo PET imaging of the adenosine A(2A) receptor in the brain using [(18)F]FLUDA, a deuterated radiotracer with high metabolic stability
title_sort improved in vivo pet imaging of the adenosine a(2a) receptor in the brain using [(18)f]fluda, a deuterated radiotracer with high metabolic stability
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8263428/
https://www.ncbi.nlm.nih.gov/pubmed/33532910
http://dx.doi.org/10.1007/s00259-020-05164-4
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