Abstract
The pharmacology of the M 5 muscarinic acetylcholine receptor (mAChR) is the least understood of the five mAChR subtypes due to a historic lack of selective small molecule tools. To address this shortcoming, we have continued the optimization effort around the prototypical M 5 positive allosteric modulator (PAM) ML380 and have discovered and optimized a new series of M 5 PAMs based on a chiral N-(indanyl)piperidine amide core with robust SAR, human and rat M 5 PAM EC 50 values <100 nM and rat brain/plasma K p values of ∼0.40. Interestingly, unlike M 1 and M 4 PAMs with unprecedented mAChR subtype selectivity, this series of M 5 PAMs displayed varying degrees of PAM activity at the other two natively G q -coupled mAChRs, M 1 and M 3 , yet were inactive at M 2 and M 4 .
Original language | English |
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Journal | ACS Chemical Neuroscience |
Volume | 9 |
Issue number | 7 |
Pages (from-to) | 1572-1581 |
Number of pages | 10 |
ISSN | 1948-7193 |
DOIs | |
Publication status | Published - 18 Jul 2018 |
Externally published | Yes |