Functional neuroanatomy of the nigrostriatal and striatonigral pathways as studied with dual probe microdialysis in the awake rat .2. Evidence for striatal N-methyl-D-aspartate receptor regulation of striatonigral gabaergic transmission and motor function

被引:52
作者
Morari, M
OConnor, WT
Ungerstedt, U
Bianchi, C
Fuxe, K
机构
[1] KAROLINSKA INST,DEPT NEUROSCI,STOCKHOLM,SWEDEN
[2] KAROLINSKA INST,DEPT PHYSIOL & PHARMACOL,STOCKHOLM,SWEDEN
关键词
basal ganglia; microdialysis; NMDA; dopamine; glutamate; GABA;
D O I
10.1016/0306-4522(95)00556-0
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
In the present study we used the dual probe approach to investigate striatal N-methyl-D-aspartate receptor regulation of GABA release from the substantia nigra pars reticulata of the awake, freely moving rat. One microdialysis probe of concentric design was implanted in the dorsolateral striatum and another in the ipsilateral substantia nigra pars reticulata. Perfusion with N-methyl-D-aspartate (100 mu M) in the dorsolateral striatum decreased local dopamine release (-25%) and increased both glutamate (+40%) and GABA (+35%) release. Moreover, perfusion with N-methyl-D-aspartate (100 mu M) in the dorsolateral striatum increased GABA release (+20%) in the substantia nigra pars reticulata. Perfusion with the lower (10 mu M) N-methyl-D-aspartate concentration in the dorsolateral striatum did not affect striatal dopamine, glutamate and GABA release or nigral GABA release. Intrastriatal perfusion with the N-methyl-D-aspartate receptor antagonist dizocilpine maleate (10 mu M), at a dose which by itself did not affect basal striatal or nigral neurotransmitter levels, prevented the effects of striatal perfusion with N-methyl-D-aspartate on both striatal and nigral neurotransmitter release. Intrastriatal dizocilpine maleate was also perfused concurrently with intranigral tetrodotoxin (10 mu M) (see accompanying paper). Intrastriatal perfusion with dizocilpine maleate prevented the tetrodotoxin-induced rise in both striatal and nigral GABA levels and profoundly reduced the tetrodotoxin-induced contralateral turning. In addition, intrastriatal dizocilpine maleate delayed the increase in striatal glutamate release evoked by intranigral tetrodotoxin without affecting the associated decrease in striatal dopamine release. The present study demonstrates that N-methyl-D-aspartate receptors in the dorsolateral striatum regulate GABA release in the substantia nigra pars reticulata of the awake rat and provides evidence that this regulation plays a key role in motor function.
引用
收藏
页码:89 / 97
页数:9
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