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Evoked Acetylcholine Release Expressed in Neuroblastoma Cells by Transfection of Mediatophore cDNA
Author(s) -
FalkVairant J.,
Corrèges P.,
EderColli L.,
Salem N.,
Meunier F. M.,
Lesbats B.,
Loctin F.,
Synguelakis M.,
Israël M.,
Dunant Y.
Publication year - 1996
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1046/j.1471-4159.1996.66031322.x
Subject(s) - acetylcholine , transfection , xenopus , calcium , biology , myocyte , microbiology and biotechnology , stimulation , neuromuscular junction , torpedo , ionophore , cell culture , chemistry , neuroscience , endocrinology , biochemistry , acetylcholine receptor , membrane , genetics , receptor , organic chemistry , gene
Transmitter release was elicited in two ways from cultured cells filled with acetylcholine: (a) in a biochemical assay by successive addition of a calcium ionophore and calcium and (b) electrophysiologically, by electrical stimulation of individual cells and real‐time recording with an embryonic Xenopus myocyte. Glioma C6‐Bu‐1 cells were found to be competent for Ca 2+ ‐dependent and quantal release. In contrast, no release could be elicited from mouse neuroblastoma N18TG‐2 cells. However, acetylcholine release could be restored when N18TG‐2 cells were transfected with a plasmid coding for mediatophore. Mediatophore is a protein of nerve terminal membranes purified from the Torpedo electric organ on the basis of its acetylcholine‐releasing capacity. The transfected N18TG‐2 cells expressed Torpedo mediatophore in their plasma membrane. In response to an electrical stimulus, they generated in the myocyte evoked currents that were curare sensitive and calcium dependent and displayed discrete amplitude levels, like in naturally occurring synapses.