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Vol. 58, Issue 2, 312-318, August 2000
-Bungarotoxin-Sensitive Nicotinic Receptors Indirectly
Modulate [3H]Dopamine Release in Rat Striatal Slices via
Glutamate Release
Department of Biology and Biochemistry, University of Bath, Bath,
United Kingdom
Nicotinic agonists elicit the release of dopamine from striatal
synaptosomes by acting on presynaptic nicotinic acetylcholine receptors
(nAChRs) on dopamine nerve terminals. Both
3
2* and
4
2 nAChR
subtypes (but not
7* nAChRs) have been implicated. Here, we compared
nAChR-evoked [3H]dopamine release from rat striatal
synaptosome and slice preparations by using the nicotinic agonist
anatoxin-a. In the more integral slice preparation, the
concentration-response curve for anatoxin-a-evoked [3H]dopamine release was best fitted to a two-site model,
giving EC50 values of 241 nM and 5.1 µM, whereas only the
higher-affinity component was observed in synaptosome preparations
(EC50 = 134 nM). Responses to a high concentration of
anatoxin-a (25 µM) in slices (but not in synaptosomes) were partially
blocked by ionotropic glutamate receptor antagonists (kynurenic acid,
6,7-dinitroquinoxaline-2,3-dione) and by
7*-selective nAChR
antagonists (
-bungarotoxin,
-conotoxin-ImI, methyllycaconitine)
in a nonadditive manner. In contrast, the
3
2-selective nAChR
antagonist
-conotoxin-MII partially inhibited [3H]dopamine release from both slice and synaptosome
preparations, stimulated with both low (1 µM) and high (25 µM)
concentrations of anatoxin-a. Antagonism by
-conotoxin-MII was
additive with that of
7*-selective antagonists. These data support a
model in which
7* nAChRs on striatal glutamate terminals elicit
glutamate release, which in turn acts at ionotropic glutamate receptors on dopamine terminals to stimulate dopamine release. In addition, non-
7* nAChRs on dopamine terminals also stimulate dopamine release. These observations have implications for the complex cholinergic modulation of inputs onto the major efferent neurons of the striatum.
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