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The Journal of Neuroscience, December 1, 1999, 19(23):10237-10249
Regulation of the Subcellular Distribution of m4 Muscarinic Acetylcholine Receptors in Striatal Neurons In Vivo by the Cholinergic Environment: Evidence for Regulation of Cell Surface Receptors by Endogenous and Exogenous Stimulation
Véronique Bernard1, Allan I. Levey2, and Bertrand Bloch1 1 Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5541, Laboratoire d'Histologie-Embryologie, Université Victor Ségalen-Bordeaux 2, 33076 Bordeaux Cedex, France, and 2 Emory University Woodruff Memorial Research Building, Atlanta, Georgia 30322
Our aim was to determine how the cholinergic environment influences, in vivo, the membrane abundance and the intracellular trafficking of the muscarinic receptor m4 (m4R). Immunohistochemistry at light and electron microscopic level was used to detect the subcellular localization of m4R in several populations of striatal cholinoceptive neurons, including cholinergic neurons and medium spiny neurons.
(1) In control rats, in cholinergic neurons, m4R is mostly restricted to intracytoplasmic sites involved in its synthesis, especially endoplasmic reticulum. In contrast, m4R is preferentially located at the plasma membrane in cell bodies and dendritic shafts and spines of medium spiny neurons. The density of m4R was greater at the membrane of perikarya in patches (striatal areas with low acetylcholine activity) than in matrix (striatal areas with high acetylcholine activity). (2) Stimulation of muscarinic receptor with oxotremorine provokes translocation of m4R from the membrane to endosomes in perikarya and dendrites of medium spiny neurons but has no influence on the localization of m4R in the cytoplasm of cholinergic cell bodies.
Our results suggest that the intraneuronal trafficking and the abundance of membrane-bound m4R in vivo is under regulation of the cholinergic environment. The m4R subcellular compartmentalization depends on the phenotype of the cholinoceptive neuron and on its neurochemical environment. Such regulation, by modulating availability of receptor for endogenous and exogenous ligands, may play key roles in the response of target neurons.
Key words: endocytosis; G-protein-coupled receptors; patches; matrix; basal ganglia; immunohistochemistry; multivesicular bodies
Copyright © 1999 Society for Neuroscience 0270-6474/99/192310237-13$05.00/0
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