Butcher, A. J. et al. (2016) An antibody biosensor establishes the activation of the M1 muscarinic acetylcholine receptor during learning and memory. Journal of Biological Chemistry, 291(17), pp. 8862-8875. (doi: 10.1074/jbc.M115.681726) (PMID:26826123) (PMCID:PMC4861454)
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Abstract
Establishing the in vivo activation status of G protein-coupled receptors would not only indicate physiological roles of G protein-coupled receptors but would also aid drug discovery by establishing drug/receptor engagement. Here, we develop a phospho-specific antibody-based biosensor to detect activation of the M-1 muscarinic acetylcholine receptor (M-1 mAChR) in vitro and in vivo. Mass spectrometry phosphoproteomics identified 14 sites of phosphorylation on the M-1 mAChR. Phospho-specific antibodies to four of these sites established that serine at position 228 (Ser(228)) on the M-1 mAChR showed extremely low levels of basal phosphorylation that were significantly up-regulated by orthosteric agonist stimulation. In addition, the M-1 mAChR-positive allosteric modulator, 1-(4-methoxybenzyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid, enhanced acetylcholine-mediated phosphorylation at Ser(228). These data supported the hypothesis that phosphorylation at Ser(228) was an indicator of M-1 mAChR activation. This was further supported in vivo by the identification of phosphorylated Ser(228) on the M-1 mAChR in the hippocampus of mice following administration of the muscarinic ligands xanomeline and 1-(4-methoxybenzyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid. Finally, Ser(228) phosphorylation was seen to increase in the CA1 region of the hippocampus following memory acquisition, a response that correlated closely with up-regulation of CA1 neuronal activity. Thus, determining the phosphorylation status of the M-1 mAChR at Ser(228) not only provides a means of establishing receptor activation following drug treatment both in vitro and in vivo but also allows for the mapping of the activation status of the M-1 mAChR in the hippocampus following memory acquisition thereby establishing a link between M-1 mAChR activation and hippocampus-based memory and learning.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Prihandoko, Dr Rudi and Bourgognon, Dr Julie-Myrtille and Tobin, Andrew and Bradley, Dr Sophie |
Authors: | Butcher, A. J., Bradley, S. J., Prihandoko, R., Brooke, S. M., Mogg, A., Bourgognon, J.-M., Macedo-Hatch, T., Edwards, J. M., Bottrill, A. R., Challiss, R. A. J., Broad, L. M., Felder, C. C., and Tobin, A. B. |
College/School: | College of Medical Veterinary and Life Sciences > School of Molecular Biosciences College of Medical Veterinary and Life Sciences > School of Health & Wellbeing > Mental Health and Wellbeing |
Journal Name: | Journal of Biological Chemistry |
Publisher: | American Society for Biochemistry and Molecular Biology, Inc. |
ISSN: | 0021-9258 |
ISSN (Online): | 1083-351X |
Published Online: | 29 January 2016 |
Copyright Holders: | Copyright © 2016 The American Society for Biochemistry and Molecular Biology, Inc. |
First Published: | First published in Journal of Biological Chemistry 291(17):8862-8875 |
Publisher Policy: | Reproduced under a Creative Commons License |
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