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Previous Article | Next Article
The Journal of Neuroscience, March 1, 2002, 22(5):1709-1717
Characterization of Central Inhibitory Muscarinic Autoreceptors by the Use of Muscarinic Acetylcholine Receptor Knock-Out Mice
Weilie Zhang1, Anthony S. Basile1, Jesus Gomeza1, Laura A. Volpicelli2, Allan I. Levey2, and Jürgen Wess1 1 Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892, and 2 Department of Neurology, Emory University School of Medicine, Atlanta, Georgia 30322
Forebrain muscarinic acetylcholine (ACh) receptors (mAChRs; M1-M5) are predicted to play important roles in many fundamental central functions, including higher cognitive processes and modulation of extrapyramidal motor activity. Synaptic ACh levels are known to be regulated by the activity of presynaptic muscarinic autoreceptors mediating inhibition of ACh release. Primarily because of the use of ligands with limited receptor subtype selectivity, classical pharmacological studies have led to conflicting results regarding the identity of the mAChR subtypes mediating this activity in different areas of the brain. To investigate the molecular identity of hippocampal, cortical, and striatal inhibitory muscarinic autoreceptors in a more direct manner, we used genetically altered mice lacking functional M2 and/or M4 mAChRs [knock-out (KO) mice]. After labeling of cellular ACh pools with [3H]choline, potassium-stimulated [3H]ACh release was measured in superfused brain slices, either in the absence or the presence of muscarinic drugs. The nonsubtype-selective muscarinic agonist, oxotremorine (0.1-10 µM), inhibited potassium-stimulated [3H]ACh release in hippocampal, cortical, and striatal slices prepared from wild-type mice by up to 80%. This activity was totally abolished in tissues prepared from M2-M4 receptor double KO mice. Strikingly, release studies with brain slices from M2 and M4 receptor single KO mice indicated that autoinhibition of ACh release is mediated primarily by the M2 receptor in hippocampus and cerebral cortex, but predominantly by the M4 receptor in the striatum. These results, together with additional receptor localization studies, support the novel concept that autoinhibition of ACh release involves different mAChRs in different regions of the brain.
Key words: acetylcholine release; autoreceptors; knock-out mice; muscarinic receptors; oxotremorine; presynaptic receptors
Copyright © 2002 Society for Neuroscience 0270-6474/02/2251709-09$05.00/0
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