Identification and Preclinical Development of a 2,5,6-Trisubstituted Fluorinated Pyridine Derivative as a Radioligand for the Positron Emission Tomography Imaging of Cannabinoid Type 2 Receptors
Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. Wit...
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Published in | Journal of medicinal chemistry Vol. 63; no. 18; pp. 10287 - 10306 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , |
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Language | English |
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American Chemical Society
24.09.2020
Amer Chemical Soc |
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Abstract | Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a sub-nanomolar affinity (K i for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18-d 6 exhibited outstanding in vitro performance characteristics and was radiofluorinated with an average radiochemical yield of 10.6 ± 3.8% (n = 16) and molar activities ranging from 52 to 65 GBq/μmol (radiochemical purity > 99%). [18F]RoSMA-18-d 6 showed exceptional CB2 attributes as demonstrated by in vitro autoradiography, ex vivo biodistribution, and positron emission tomography (PET). Further, [18F]RoSMA-18-d 6 was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [18F]RoSMA-18-d 6 is a promising CB2 PET radioligand for clinical translation. |
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AbstractList | Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a sub-nanomolar affinity (Ki for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18-d6 exhibited outstanding in vitro performance characteristics and was radiofluorinated with an average radiochemical yield of 10.6 ± 3.8% (n = 16) and molar activities ranging from 52 to 65 GBq/μmol (radiochemical purity > 99%). [18F]RoSMA-18-d6 showed exceptional CB2 attributes as demonstrated by in vitro autoradiography, ex vivo biodistribution, and positron emission tomography (PET). Further, [18F]RoSMA-18-d6 was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [18F]RoSMA-18-d6 is a promising CB2 PET radioligand for clinical translation.Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a sub-nanomolar affinity (Ki for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18-d6 exhibited outstanding in vitro performance characteristics and was radiofluorinated with an average radiochemical yield of 10.6 ± 3.8% (n = 16) and molar activities ranging from 52 to 65 GBq/μmol (radiochemical purity > 99%). [18F]RoSMA-18-d6 showed exceptional CB2 attributes as demonstrated by in vitro autoradiography, ex vivo biodistribution, and positron emission tomography (PET). Further, [18F]RoSMA-18-d6 was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [18F]RoSMA-18-d6 is a promising CB2 PET radioligand for clinical translation. Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a sub-nanomolar affinity (K i for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18-d 6 exhibited outstanding in vitro performance characteristics and was radiofluorinated with an average radiochemical yield of 10.6 ± 3.8% (n = 16) and molar activities ranging from 52 to 65 GBq/μmol (radiochemical purity > 99%). [18F]RoSMA-18-d 6 showed exceptional CB2 attributes as demonstrated by in vitro autoradiography, ex vivo biodistribution, and positron emission tomography (PET). Further, [18F]RoSMA-18-d 6 was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [18F]RoSMA-18-d 6 is a promising CB2 PET radioligand for clinical translation. Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a subnanomolar affinity (K-i for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18-d(6) exhibited outstanding in vitro performance characteristics and was radio-fluorinated with an average radiochemical yield of 10.6 +/- 3.8% (n = 16) and molar activities ranging from 52 to 65 GBq/mu mol (radiochemical purity > 99%). [F-18]RoSMA-18-d(6) showed exceptional CB2 attributes as demonstrated by in vitro autoradiography, ex vivo biodistribution, and positron emission tomography (PET). Further, [F-18]RoSMA-18-d(6) was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [F-18]RoSMA-18-d(6) is a promising CB2 PET radioligand for clinical translation. Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in clinical routine. In this work, we synthesized 15 fluorinated pyridine derivatives and tested their binding affinities toward CB2 and CB1. With a sub-nanomolar affinity ( for CB2) of 0.8 nM and a remarkable selectivity factor of >12,000 over CB1, RoSMA-18- exhibited outstanding performance characteristics and was radiofluorinated with an average radiochemical yield of 10.6 ± 3.8% ( = 16) and molar activities ranging from 52 to 65 GBq/μmol (radiochemical purity > 99%). [ F]RoSMA-18- showed exceptional CB2 attributes as demonstrated by autoradiography, biodistribution, and positron emission tomography (PET). Further, [ F]RoSMA-18- was used to detect CB2 upregulation on postmortem human ALS spinal cord tissues. Overall, these results suggest that [ F]RoSMA-18- is a promising CB2 PET radioligand for clinical translation. |
Author | Muri, Dieter Herde, Adrienne Müller Mu, Linjing Bürkler, Markus Weber, Markus Gobbi, Luca Ullmer, Christoph Knuesel, Irene Kretz, Julian Iding, Hans Binder, Martin Honer, Michael Pacher, Pal Bartelmus, Christian Haider, Achi Brink, Andreas Spinelli, Francesco Atz, Kenneth Keller, Claudia Woltering, Thomas J. Grether, Uwe Schibli, Roger Ametamey, Simon M. Ahmed, Hazem |
AuthorAffiliation | Neuromuscular Diseases Unit/ALS Clinic Pharma Research and Early Development, Roche Innovation Center Basel Department of Nuclear Medicine F. Hoffmann-La Roche Laboratory of Cardiovascular Physiology and Tissue Injury ETH Zurich Pharma Technical Development National Institute of Health/NIAAA F. Hoffmann-La Roche Ltd Institute of Pharmaceutical Sciences University Hospital Zurich |
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SubjectTerms | Animals Brain - diagnostic imaging Chemistry, Medicinal Fluorine Radioisotopes - chemistry Humans Life Sciences & Biomedicine Ligands Male Molecular Docking Simulation Molecular Structure Pharmacology & Pharmacy Positron-Emission Tomography Pyridines - chemical synthesis Pyridines - pharmacokinetics Pyridines - pharmacology Radiopharmaceuticals - chemical synthesis Radiopharmaceuticals - pharmacokinetics Radiopharmaceuticals - pharmacology Rats, Wistar Receptor, Cannabinoid, CB2 - metabolism Science & Technology Spinal Cord - diagnostic imaging Spleen - diagnostic imaging Structure-Activity Relationship Tritium - chemistry |
Title | Identification and Preclinical Development of a 2,5,6-Trisubstituted Fluorinated Pyridine Derivative as a Radioligand for the Positron Emission Tomography Imaging of Cannabinoid Type 2 Receptors |
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