Ultrastructural immunocytochemical localization of the N-methyl-D-aspartate receptor and tyrosine hydroxylase in the shell of the rat nucleus accumbens

Brain Research
K N Gracy, V M Pickel

Abstract

The N-methyl-D-aspartate (NMDA)-type glutamate receptors in the shell region of the nucleus accumbens (ACB) have been implicated in the modulation of dopamine release and in amphetamine-induced neurotoxicity. We used electron microscopic immunocyto-chemistry to determine the anatomical sites for NMDA-mediated effects of glutamate and for their potential interactions with dopaminergic afferents identified by the presence of tyrosine hydroxylase (TH) in this region of the rat brain. Immunogold and immunoperoxidase methods were used to localize antisera against the R1 subunit of the NMDA receptor (NMDAR1) alone or combined with TH. In single labeling experiments, approximately half of the NMDAR1-like immunoreactivity (NMDAR1-LI) was localized to extrasynaptic plasma membranes of neuronal processes, many (92 out of 215) of which were dendrites, and only 33 out of 215 were unmyelinated axons or terminals. Surprisingly, the neuronal labeling of NMDAR1 was almost equaled by that seen in astrocytic processes (88 out of 215). Dual labeling for TH and NMDAR1 was rarely observed and was only seen in axons. However, in favorable planes of section, NMDAR1 was noted along intervaricose segments of axons in which TH was more readily seen in t...Continue Reading

Citations

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