PET imaging of M4 muscarinic acetylcholine receptors in rhesus macaques using [11C]MK-6884: Quantification with kinetic modeling and receptor occupancy by CVL-231 (emraclidine), a novel positive allosteric modulator
Stimulation of the M4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia. Emraclidine (CVL-231) is a novel, highly selective, positive allosteric modulator (PAM) of M4 muscarinic acetylcholine receptors i.e. acts a...
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Published in | Journal of cerebral blood flow and metabolism Vol. 44; no. 8; pp. 1329 - 1342 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
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London, England
SAGE Publications
01.08.2024
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Abstract | Stimulation of the M4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia. Emraclidine (CVL-231) is a novel, highly selective, positive allosteric modulator (PAM) of M4 muscarinic acetylcholine receptors i.e. acts as a modulator that increases the response of these receptors. First, we aimed to further characterize the positron emission tomography (PET) imaging and quantification performance of a recently developed M4 PAM radiotracer, [11C]MK-6884, in non-human primates (NHPs). Second, we applied these results to determine the receptor occupancy of CVL-231 as a function of dose. Using paired baseline-blocking PET scans, we quantified total volume of distribution, binding potential, and receptor occupancy. Both blood-based and reference region-based methods quantified M4 receptor levels across brain regions. The 2-tissue 4-parameter kinetic model best fitted regional [11C]MK-6884-time activity curves. Only the caudate nucleus and putamen displayed statistically significant [11C]MK-6884 uptake and dose-dependent blocking by CVL-231. For binding potential and receptor occupancy quantification, the simplified reference tissue model using the grey cerebellum as a reference region was employed. CVL-231 demonstrated dose-dependent M4 receptor occupancy in the striatum of the NHP brain and shows promise for further development in clinical trials. |
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AbstractList | Stimulation of the M 4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia. Emraclidine (CVL-231) is a novel, highly selective, positive allosteric modulator (PAM) of M4 muscarinic acetylcholine receptors i.e. acts as a modulator that increases the response of these receptors. First, we aimed to further characterize the positron emission tomography (PET) imaging and quantification performance of a recently developed M 4 PAM radiotracer, [ 11 C]MK-6884, in non-human primates (NHPs). Second, we applied these results to determine the receptor occupancy of CVL-231 as a function of dose. Using paired baseline-blocking PET scans, we quantified total volume of distribution, binding potential, and receptor occupancy. Both blood-based and reference region-based methods quantified M 4 receptor levels across brain regions. The 2-tissue 4-parameter kinetic model best fitted regional [ 11 C]MK-6884-time activity curves. Only the caudate nucleus and putamen displayed statistically significant [ 11 C]MK-6884 uptake and dose-dependent blocking by CVL-231. For binding potential and receptor occupancy quantification, the simplified reference tissue model using the grey cerebellum as a reference region was employed. CVL-231 demonstrated dose-dependent M 4 receptor occupancy in the striatum of the NHP brain and shows promise for further development in clinical trials. Stimulation of the M4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia. Emraclidine (CVL-231) is a novel, highly selective, positive allosteric modulator (PAM) of M4 muscarinic acetylcholine receptors i.e. acts as a modulator that increases the response of these receptors. First, we aimed to further characterize the positron emission tomography (PET) imaging and quantification performance of a recently developed M4 PAM radiotracer, [11C]MK-6884, in non-human primates (NHPs). Second, we applied these results to determine the receptor occupancy of CVL-231 as a function of dose. Using paired baseline-blocking PET scans, we quantified total volume of distribution, binding potential, and receptor occupancy. Both blood-based and reference region-based methods quantified M4 receptor levels across brain regions. The 2-tissue 4-parameter kinetic model best fitted regional [11C]MK-6884-time activity curves. Only the caudate nucleus and putamen displayed statistically significant [11C]MK-6884 uptake and dose-dependent blocking by CVL-231. For binding potential and receptor occupancy quantification, the simplified reference tissue model using the grey cerebellum as a reference region was employed. CVL-231 demonstrated dose-dependent M4 receptor occupancy in the striatum of the NHP brain and shows promise for further development in clinical trials. Stimulation of the M muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia. Emraclidine (CVL-231) is a novel, highly selective, positive allosteric modulator (PAM) of M4 muscarinic acetylcholine receptors i.e. acts as a modulator that increases the response of these receptors. First, we aimed to further characterize the positron emission tomography (PET) imaging and quantification performance of a recently developed M PAM radiotracer, [ C]MK-6884, in non-human primates (NHPs). Second, we applied these results to determine the receptor occupancy of CVL-231 as a function of dose. Using paired baseline-blocking PET scans, we quantified total volume of distribution, binding potential, and receptor occupancy. Both blood-based and reference region-based methods quantified M receptor levels across brain regions. The 2-tissue 4-parameter kinetic model best fitted regional [ C]MK-6884-time activity curves. Only the caudate nucleus and putamen displayed statistically significant [ C]MK-6884 uptake and dose-dependent blocking by CVL-231. For binding potential and receptor occupancy quantification, the simplified reference tissue model using the grey cerebellum as a reference region was employed. CVL-231 demonstrated dose-dependent M receptor occupancy in the striatum of the NHP brain and shows promise for further development in clinical trials. |
Author | Dhaynaut, Maeva MacDonagh, Alexander C Rice, Peter A Duvvuri, Sridhar El Fakhri, Georges Chakilam, Srinivas Iredale, Philip Renger, John J Normandin, Marc D Moon, Sung-Hyun Belov, Vasily Yokell, Daniel L Guehl, Nicolas J |
Author_xml | – sequence: 1 givenname: Vasily surname: Belov fullname: Belov, Vasily organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 2 givenname: Nicolas J surname: Guehl fullname: Guehl, Nicolas J email: nicolas.guehl@yale.edu organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 3 givenname: Sridhar surname: Duvvuri fullname: Duvvuri, Sridhar organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 4 givenname: Philip surname: Iredale fullname: Iredale, Philip organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 5 givenname: Sung-Hyun surname: Moon fullname: Moon, Sung-Hyun organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 6 givenname: Maeva surname: Dhaynaut fullname: Dhaynaut, Maeva organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 7 givenname: Srinivas surname: Chakilam fullname: Chakilam, Srinivas organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 8 givenname: Alexander C surname: MacDonagh fullname: MacDonagh, Alexander C organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 9 givenname: Peter A surname: Rice fullname: Rice, Peter A organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 10 givenname: Daniel L surname: Yokell fullname: Yokell, Daniel L organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 11 givenname: John J surname: Renger fullname: Renger, John J organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 12 givenname: Georges surname: El Fakhri fullname: El Fakhri, Georges organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA – sequence: 13 givenname: Marc D orcidid: 0000-0003-1645-523X surname: Normandin fullname: Normandin, Marc D email: marc.normandin@yale.edu organization: Cerevel Therapeutics, LLC, Cambridge, MA, USA |
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Snippet | Stimulation of the M4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia.... Stimulation of the M muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for schizophrenia.... Stimulation of the M 4 muscarinic acetylcholine receptor reduces striatal hyperdopaminergia, suggesting its potential as a therapeutic target for... |
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SubjectTerms | Allosteric Regulation Animals Azabicyclo Compounds - pharmacokinetics Azabicyclo Compounds - pharmacology Brain - diagnostic imaging Brain - drug effects Brain - metabolism Carbon Radioisotopes Cyclic S-Oxides - pharmacology Female Kinetics Macaca mulatta Male Positron-Emission Tomography - methods Radiopharmaceuticals - pharmacokinetics Receptor, Muscarinic M4 - metabolism |
Title | PET imaging of M4 muscarinic acetylcholine receptors in rhesus macaques using [11C]MK-6884: Quantification with kinetic modeling and receptor occupancy by CVL-231 (emraclidine), a novel positive allosteric modulator |
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