Application of Parallel Multiparametric Cell-Based FLIPR Detection Assays for the Identification of Modulators of the Muscarinic Acetylcholine Receptor 4 (M4).

Smith E, Chase P, Niswender CM, Utley TJ, Sheffler DJ, Noetzel MJ, Lamsal A, Wood MR, Conn PJ, Lindsley CW, Madoux F, Acosta M, Scampavia L, Spicer T, Hodder P
J Biomol Screen. 2015 20 (7): 858-68

PMID: 25877150 · PMCID: PMC4659430 · DOI:10.1177/1087057115581770

Muscarinic acetylcholine receptors (mAChRs) have long been viewed as viable targets for novel therapeutic agents for the treatment of Alzheimer's disease and other disorders involving impaired cognitive function. In an attempt to identify orthosteric and allosteric modulators of the muscarinic acetylcholine receptor M(4) (M(4)), we developed a homogenous, multiparametric, 1536-well assay to measure M(4) receptor agonism, positive allosteric modulation (PAM), and antagonism in a single well. This assay yielded a Z' of 0.85 ± 0.05 in the agonist, 0.72 ± 0.07 in PAM, and 0.80 ± 0.06 in the antagonist mode. Parallel screening of the M(1) and M(5) subtypes using the same multiparametric assay format revealed chemotypes that demonstrate selectivity and/or promiscuity between assays and modalities. This identified 503 M(4) selective primary agonists, 1450 PAMs, and 2389 antagonist hits. Concentration-response analysis identified 25 selective agonists, 4 PAMs, and 41 antagonists. This demonstrates the advantages of this approach to rapidly identify selective receptor modulators while efficiently removing assay artifacts and undesirable compounds.

© 2015 Society for Laboratory Automation and Screening.

MeSH Terms (11)

Allosteric Regulation Animals Cell Line Drug Discovery Gene Expression High-Throughput Screening Assays Humans Muscarinic Agonists Muscarinic Antagonists Receptor, Muscarinic M4 Small Molecule Libraries

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