Bioorganic and medicinal chemistry (2020)
Update date:2022-07-31
Topics:
Inagaki, Yusuke
Ino, Katsutoshi
Ishizu, Kenichiro
Koike, Takanori
Maeda, Jun
Negoro, Kenji
Shimoshige, Yukinori
Takahashi, Taisuke
Tanaka, Hiroaki
Tsukamoto, Issei
Yokoyama, Kazuhiro
The M3 muscarinic acetylcholine receptor (mAChR) is a member of the family of mAChRs, which are associated with a variety of physiological functions including the contraction of various smooth muscle tissues, stimulation of glandular secretion, and regulation of a range of cholinergic processes in the central nerve system. We report here the discovery and a comprehensive structure--activity relationships (SARs) study of novel positive allosteric modulators (PAMs) of the M3 mAChR through a high throughput screening (HTS) campaign. Compound 9 exhibited potent in vitro PAM activity towards the M3 mAChR and significant enhancement of muscle contraction in a concentration-dependent manner when applied to isolated smooth muscle strips of rat bladder. Compound 9 also showed excellent subtype selectivity over other subtypes of mAChRs including M1, M2, and M4 mAChRs, and moderate selectivity over the M5 mAChR, indicating that compound 9 is an M3-preferring M3/M5 dual PAM. Moreover, compound 9 displayed acceptable pharmacokinetics profiles after oral dosing to rats. These results suggest that compound 9 may be a promising chemical probe for the M3 mAChR for further investigation of its pharmacological function both in vitro and in vivo.
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