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 inJournal of medicinal chemistry Vol. 63; no. 18; pp. 10287 - 10306
Main Authors Haider, Achi, Gobbi, Luca, Kretz, Julian, Ullmer, Christoph, Brink, Andreas, Honer, Michael, Woltering, Thomas J., Muri, Dieter, Iding, Hans, Bürkler, Markus, Binder, Martin, Bartelmus, Christian, Knuesel, Irene, Pacher, Pal, Herde, Adrienne Müller, Spinelli, Francesco, Ahmed, Hazem, Atz, Kenneth, Keller, Claudia, Weber, Markus, Schibli, Roger, Mu, Linjing, Grether, Uwe, Ametamey, Simon M.
Format Journal Article
LanguageEnglish
Published WASHINGTON 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.
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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BackLink https://www.ncbi.nlm.nih.gov/pubmed/32787079$$D View this record in MEDLINE/PubMed
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Keywords SYSTEM
PET RADIOLIGANDS
CB2 RECEPTORS
PHARMACOLOGY
HIGH-AFFINITY
IN-VIVO EVALUATION
EXPRESSION
BINDING
DISCOVERY
LIPOPHILICITY
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SSID ssj0003123
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Snippet Despite the broad implications of the cannabinoid type 2 receptor (CB2) in neuroinflammatory processes, a suitable CB2-targeted probe is currently lacking in...
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StartPage 10287
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
URI http://dx.doi.org/10.1021/acs.jmedchem.0c00778
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https://www.ncbi.nlm.nih.gov/pubmed/32787079
https://www.proquest.com/docview/2434059199
Volume 63
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