The PET tracer [ 11 C]MK-6884 quantifies M4 muscarinic receptor in rhesus monkeys and patients with Alzheimer's disease.

Autor:	Li W; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Wang Y; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Lohith TG; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Zeng Z; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Tong L; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Mazzola R; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Riffel K; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Miller P; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Purcell M; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Holahan M; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Haley H; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Gantert L; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Hesk D; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Ren S; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Morrow J; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Uslaner J; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Struyk A; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Wai JM; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Rudd MT; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Tellers DM; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., McAvoy T; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Bormans G; Laboratory for Radiopharmaceutical Research, KU Leuven, 3001 Leuven, Belgium., Koole M; Nuclear Medicine and Molecular Imaging, KU Leuven and University Hospital Leuven, 3001 Leuven, Belgium., Van Laere K; Nuclear Medicine and Molecular Imaging, KU Leuven and University Hospital Leuven, 3001 Leuven, Belgium., Serdons K; Nuclear Medicine and Molecular Imaging, KU Leuven and University Hospital Leuven, 3001 Leuven, Belgium., de Hoon J; Center for Clinical Pharmacology, KU Leuven, 3001 Leuven, Belgium., Declercq R; Translational Pharmacology Europe, MSD (Europe) Inc., 1200 Brussels, Belgium., De Lepeleire I; Translational Pharmacology Europe, MSD (Europe) Inc., 1200 Brussels, Belgium., Pascual MB; Nantz National Alzheimer Center, Houston Methodist Neurological Institute, Houston, TX 77030, USA.; Department of Neurology, Weill Cornell Medicine, New York, NY 10065, USA., Zanotti-Fregonara P; Nantz National Alzheimer Center, Houston Methodist Neurological Institute, Houston, TX 77030, USA.; Department of Neurology, Weill Cornell Medicine, New York, NY 10065, USA., Yu M; Nantz National Alzheimer Center, Houston Methodist Neurological Institute, Houston, TX 77030, USA.; Department of Neurology, Weill Cornell Medicine, New York, NY 10065, USA., Arbones V; Nantz National Alzheimer Center, Houston Methodist Neurological Institute, Houston, TX 77030, USA., Masdeu JC; Nantz National Alzheimer Center, Houston Methodist Neurological Institute, Houston, TX 77030, USA.; Department of Neurology, Weill Cornell Medicine, New York, NY 10065, USA., Cheng A; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Hussain A; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Bueters T; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Anderson MS; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Hostetler ED; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA., Basile AS; MRL, Merck & Co. Inc., Kenilworth, NJ 07033, USA.
Jazyk:	angličtina
Zdroj:	Science translational medicine [Sci Transl Med] 2022 Jan 12; Vol. 14 (627), pp. eabg3684. Date of Electronic Publication: 2022 Jan 12.
DOI:	10.1126/scitranslmed.abg3684
Abstrakt:	Positron emission tomography (PET) ligands play an important role in the development of therapeutics by serving as target engagement or pharmacodynamic biomarkers. Here, we describe the discovery and translation of the PET tracer [ 11 C]MK-6884 from rhesus monkeys to patients with Alzheimer’s disease (AD). [ 3 H]MK-6884/[ 11 C]MK-6884 binds with high binding affinity and good selectivity to an allosteric site on M4 muscarinic cholinergic receptors (M4Rs) in vitro and shows a regional distribution in the brain consistent with M4R localization in vivo. The tracer demonstrates target engagement of positive allosteric modulators of the M4R (M4 PAMs) through competitive binding interactions. [ 11 C]MK-6884 binding is enhanced in vitro by the orthosteric M4R agonist carbachol and indirectly in vivo by the acetylcholinesterase inhibitor donepezil in rhesus monkeys and healthy volunteers, consistent with its pharmacology as a highly cooperative M4 PAM. PET imaging of [ 11 C]MK-6884 in patients with AD identified substantial regional differences quantified as nondisplaceable binding potential (BP ND ) of [ 11 C]MK-6884. These results suggest that [ 11 C]MK-6884 is a useful target engagement biomarker for M4 PAMs but may also act as a sensitive probe of neuropathological changes in the brains of patients with AD.
Databáze:	MEDLINE
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