Abstract:
:Administration of selective agonists of D1 dopamine receptors increases immediate early gene expression in striatal neurons, a response which is particularly robust in the dopamine-depleted striatum. Although interactions between dopamine and glutamate receptor-mediated responses in striatal neurons have been demonstrated in a number of experimental paradigms, our previous findings indicate that N-methyl-D-aspartate antagonists do not block D1 receptor-mediated induction of immediate early genes in the dopamine-depleted striatum. In the present study, we therefore examined interactions between D1 dopamine receptors and the (+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate/kainate subtypes of glutamate receptor by determining whether striatal infusion of the (+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate/kainate antagonist 6-cyano-7-nitroquinoxaline-2,3-dione would block D1 receptor-mediated induction of the immediate early genes c-fos and zif268 in the dopamine-depleted striatum. Striatal infusion of 6-cyano-7-nitroquinoxaline-2,3-dione (1 mM) completely blocked (+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate-induced c-fos and zif268 expression. However, 6-cyano-7-nitroquinoxaline-2,3-dione (1 microM-1 mM) did not significantly affect induction of c-fos and zif268 by D1 receptor stimulation (SKF 38393, 2 mg/kg, i.p.) in the dopamine-depleted striatum. To more generally block excitatory input, tetrodotoxin (10 microM) was infused into the striatum of rats receiving a D1 agonist. Local infusion of tetrodotoxin had minimal effect on induction of c-fos and zif268 in the dopamine-depleted striatum. In contrast, tetrodotoxin abolished induction of c-fos and zif268 messenger RNAs by the D2 antagonist eticlopride (0.5 mg/kg, i.p.) in both intact rats and dopamine-depleted rats receiving continuous D2 agonist treatment (quinpirole, 0.5 mg/kg/day). The results indicate that D1 receptor-mediated induction of immediate early genes in the dopamine-depleted striatum occurs by mechanisms that are independent of excitatory input through (+/-)-alpha-amino-3-hydroxy-5-methylisoxazole-4-propionate/kainate receptors.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Keefe KA,Gerfen CRdoi
10.1016/s0306-4522(98)00327-3keywords:
subject
Has Abstractpub_date
1999-03-01 00:00:00pages
491-504issue
2eissn
0306-4522issn
1873-7544pii
S0306-4522(98)00327-3journal_volume
89pub_type
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