Abstract
Nicotinic acetylcholine receptors (nAChRs) were identified in a subpopulation of cultured adult rat trigeminal ganglia (TG) neurons by whole-cell patch-clamp recordings. Dimethylphenylpiperazinium (DMPP), a nAChR agonist, induced inward currents in 2168 of TG neurons having soma diameters greater than 28 μm. These currents were inhibited by hexamethonium, mecamylamine and atropine, indicating the presence of neuronal ganglionic-type nAChRs. This interpretation is consistent with the finding that the nicotine- or DMPP-induced currents were not inhibited by α-bungarotoxin (α-Bng) in 5 of the 9 cells tested with this compound. However, in 2 of the 9 cells tested, the DMPP-induced currents were completely inhibited by α-Bng, and in the remaining two cells tested, the currents were partially inhibited by α-Bng. About 22% of the cells having diameters ≧28μm were specifically labeled with FITC-labeled α-Bng, whereas only 2% of the cells with soma diameters <28μm were labeled. These data taken together suggest that more than one subtype of nAChR is present in TG.
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