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V Gerzanich, R Anand and J Lindstrom
Department of Neuroscience, University of Pennsylvania, Philadelphia 19104-6074.
alpha 8 subunits of alpha-bungarotoxin-sensitive chick neuronal nicotinic acetylcholine receptors expressed in Xenopus oocytes from cRNA are shown to form homomeric, acetylcholine-gated, rapidly desensitizing, inwardly rectifying, Ca(2+)-permeable cation channels similar to those of alpha 7 homomers. alpha 8 forms oligomers of several sizes, of which < 14% are expressed on the oocyte surface, which is less efficient than for alpha 7 homomers. alpha 8 homomers are more sensitive to agonists but less sensitive to antagonists than are alpha 7 homomers, and some agonists for alpha 8 homomers are partial agonists or antagonists for alpha 7 homomers. The pharmacological properties of homomers of alpha 8 and alpha 7 subunits generally reflect those of native alpha 8 and alpha 7 receptors.
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