Bioorganic and Medicinal Chemistry p. 55 - 64 (2019)
Update date:2022-08-04
Topics:
Alapafuja, Shakiru O.
Malamas, Michael S.
Shukla, Vidyanand
Zvonok, Alexander
Miller, Sally
Daily, Laura
Rajarshi, Girija
Miyabe, Christina Yume
Chandrashekhar, Honrao
Wood, JodiAnne
Tyukhtenko, Sergiy
Straiker, Alex
Makriyannis, Alexandros
Monoacylglycerol lipase (MGL) inhibition provides a potential treatment approach to glaucoma through the regulation of ocular 2-arachidonoylglycerol (2-AG) levels and the activation of CB1 receptors. Herein, we report the discovery of new series of carbamates as highly potent and selective MGL inhibitors. The new inhibitors showed potent nanomolar inhibitory activity against recombinant human and purified rat MGL, were selective (>1000-fold) against serine hydrolases FAAH and ABHD6 and lacked any affinity for the cannabinoid receptors CB1 and CB2. Protein-based 1H NMR experiments indicated that inhibitor 2 rapidly formed a covalent adduct with MGL with a residence time of about 6 h. This interconversion process “intrinsic reversibility” was exploited by modifications of the ligand's size (length and bulkiness) to generate analogs with “tunable’ adduct residence time (τ). Inhibitor 2 was evaluated in a normotensive murine model for assessing intraocular pressure (IOP), which could lead to glaucoma, a major cause of blindness. Inhibitor 2 was found to decrease ocular pressure by ~4.5 mmHg in a sustained manner for at least 12 h after a single ocular application, underscoring the potential for topically-administered MGL inhibitors as a novel therapeutic target for the treatment of glaucoma.
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