当前位置： SCI文献检索 > NEUROPHARMACOLOGY期刊下所有文献 > Effects of lobeline and dimethylphenylpiperazinium iodide (DMPP) on N-methyl-D-aspartate (NMDA)-evoked acetylcholine release in vitro: evidence for a lack of involvement of classical neuronal nicotinic acetylcholine receptors.

Effects of lobeline and dimethylphenylpiperazinium iodide (DMPP) on N-methyl-D-aspartate (NMDA)-evoked acetylcholine release in vitro: evidence for a lack of involvement of classical neuronal nicotinic acetylcholine receptors.

Abstract：

:Biochemical, behavioral and electrophysiological evidence suggests interactions between pathways containing neuronal nicotinic acetylcholine receptors (NAChRs) and excitatory amino acid receptors. Recently, protective effects of nicotine against N-methyl-D-aspartate (NMDA)-induced toxicity in primary cortical cultures were reported. To address possible interactions between NAChR and NMDA receptor containing pathways, several NAChR agonists were evaluated for their effects on NMDA-evoked [3H]acetylcholine ([3H]ACh) release from slices of rat striatum. Nicotine, cytisine and epibatidine had no effect on NMDA-evoked release or basal release of [3H]ACh over a wide range of concentrations. Lobeline and dimethylphenylpiperazinium iodide (DMPP), however, decreased basal [3H]ACh release and attenuated NMDA-evoked [3H]ACh release with EC50 values of 35 and 155 microM, respectively. The NAChR antagonists, dihydro-beta-erythroidine (DH beta E) and d-tubocurarine had no effect on NMDA-evoked [3H]ACh release, whereas mecamylamine attenuated the NMDA-evoked [3H]ACh evoked release with an EC50 value of 144 microM. Methyllycaconitine (MLA), a highly selective and potent antagonist of the alpha-bungarotoxin-sensitive alpha 7 NAChR subtype, also had no effect on NMDA-evoked [3H]ACh release at concentrations upto 10 microM. The inhibitory effects of DMPP and lobeline on NMDA-evoked [3H[ACh release were relatively insensitive to mecamylamine, d-tubocurarine, MLA and DH beta E. In addition, DMPP or lobeline-induced attenuation of basal [3H]ACh release was insensitive to blockade by sulpiride, a dopamine (D2) receptor antagonist. In contrast to their effects on NMDA-evoked striatal [3H]ACh release, both DMPP and lobeline increased basal release of striatal [3H]DA and hippocampal [3H]norepinephrine ([3H]NE) and did not attenuate NMDA-evoked release of these two transmitters. Instead, DMPP and lobeline appeared to have an additive effect on both NMDA-evoked hippocampal [3H]NE release and striatal [3H]DA release. These pharmacological results suggest that the inhibitory effects on lobeline and DMPP on striatal [3H]ACh release are independent of their interactions with classical NAChRs or the NMDA receptor complex itself.

journal_name

Neuropharmacology

journal_title

Neuropharmacology

authors

Rao TS,Correa LD,Lloyd GK

doi

10.1016/s0028-3908(96)00162-1

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

39-50

issue

1

eissn

0028-3908

issn

1873-7064

pii

S0028390896001621

journal_volume

36

pub_type

杂志文章

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