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The present experiments were designed to further examine the hypothesis that receptor subtype determines the direction of dopamine's (DA) ability to modulate neostriatal neuronal responses. We have reported that DA potentiates responses mediated by activation of N-methyl-d-aspartate (NMDA) receptors, but attenuates responses mediated by activation of(More)
The role of D1 dopamine (DA) receptors in mediating the ability of DA to modulate responses attributable to activation of NMDA receptors was examined in mice lacking D1A dopamine receptors. Specifically, experiments were designed to test the hypothesis that the ability of DA to potentiate responses mediated by activation of NMDA receptors was attributable(More)
Dopamine (DA) receptors play an important role in the modulation of excitability and the responsiveness of neurons to activation of excitatory amino acid receptors in the striatum. In the present study, we utilized mice with genetic deletion of D2 or D4 DA receptors and their wild-type (WT) controls to examine if the absence of either receptor subtype(More)
Little is known about the morphological characteristics and intrinsic electrophysiological properties of individual neurons in the nonhuman primate hippocampus. We have used intracellular recording and biocytin-labeling techniques in the in vitro hippocampal slice preparation to provide quantitative evaluation of the fundamental morphological and intrinsic(More)
Glutamate release activates multiple receptors that interact with each other and thus determine the response of the cell. Exploring these interactions is critical to developing an understanding of the functional consequences of synaptic transmission. Activation of metabotropic glutamate receptors (mGluRs) inhibits N-methyl-D-aspartate (NMDA)-evoked(More)
Rats deprived of vitamin D at weaning were compared to control rats on open field, stabilimeter, radial arm maze and spatial reversal tasks in order to test the hypothesis that vitamin D deficiency alters behavior and learning. The deficient animals engaged in statistically less open field rearing activity and spent more time each day negotiating the radial(More)
The present study examined the electrophysiological effects produced by activation of specific dopamine (DA) receptors and the distribution of DA receptor subtypes and glutamate receptor subunits [N-methyl-D-aspartate (NMDAR1) and GluR1] in cortical tissue samples obtained from children (ages 3 months to 16 years) undergoing epilepsy surgery. DA receptor(More)
This study investigated the effects of neonatal hippocampal ablation on the development of spatial learning and memory abilities in rats. Newborn rats sustained bilateral electrolytic lesions of the hippocampus or were sham-operated on postnatal day 1 (PN1). At PN20-25, PN50-55, or PN90-95, separate groups of rats were tested in a Morris water maze on a(More)
The distribution of D1A dopamine (DA) receptor proteins was assessed by using subtype specific antireceptor antisera after acute DA exposure. The immunofluorescent staining of D1A DA receptor protein expression was examined in (1) stably transfected Chinese hamster ovary (CHO) cells, (2) primary striatal cell cultures, and (3) rat striatal brain slices.(More)
This study assessed the contribution of K+ conductances to dopamine (DA)-induced modulation of evoked depolarizing synaptic responses (DPSPs) in neostriatal slices obtained from rats. Intracellular recordings of membrane properties and DPSPs evoked by local electrical stimulation were obtained from cells bathed in standard artificial cerebrospinal fluid(More)