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Chromenopyrazole-based High Affinity, Selective Fluorescent Ligands for Cannabinoid Type 2 Receptor.

ABSTRACT: Cannabinoid type 2 receptor (CB₂R) is an attractive target for the treatment of pain and inflammatory disorders. Availability of a selective CB₂R fluorescent ligand to study CB₂R expression and localization in healthy and disease conditions would greatly contribute to improving our understanding of this receptor. Herein, we report a series of chromenopyrazole-based CB₂R fluorescent ligands. The highest affinity fluorescent ligand was Cy5-containing 24 (hCB₂R pK _i = 7.38 ± 0.05), which had 131-fold selectivity over CB₁R. In a cAMP BRET assay, 24 behaved as a potent CB₂R inverse agonist. Widefield imaging experiments showed that 24 binds to CB₂R in live cells with good selectivity and low levels of nonspecific fluorescence. The high affinity, selectivity, and suitable imaging properties of fluorescent ligand 24 make it a valuable tool for studying CB₂R.

SUBMITTER: Singh S

PROVIDER: S-EPMC6378661 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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Chromenopyrazole-based High Affinity, Selective Fluorescent Ligands for Cannabinoid Type 2 Receptor.

Singh Sameek S Oyagawa Caitlin R M CRM Macdonald Christa C Grimsey Natasha L NL Glass Michelle M Vernall Andrea J AJ

ACS medicinal chemistry letters 20190130 2

Cannabinoid type 2 receptor (CB2R) is an attractive target for the treatment of pain and inflammatory disorders. Availability of a selective CB2R fluorescent ligand to study CB2R expression and localization in healthy and disease conditions would greatly contribute to improving our understanding of this receptor. Herein, we report a series of chromenopyrazole-based CB2R fluorescent ligands. The highest affinity fluorescent ligand was Cy5-containing ...[more]

PMID: 30783505

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