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Excitatory amino acid transmission has been proposed as the principal synaptic mechanism for distribution of information through corticocortical and thalamocortical pathways. The following study utilized a double labeling paradigm, using antibodies that recognize non-NMDA ionotropic glutamate receptor subunits and other neuronal markers, to further define, quantitatively, the subclasses of neurons that contain immunoreactivity for the AMPA/kainate and kainate receptor subunits in the monkey prefrontal cortex. Double labeling with an antibody that recognizes common epitopes in AMPA/kainate subunits GluR2 and GluR3 (GluR2/3) in combination with an antibody that recognizes the kainate receptor subunits GluR5, GluR6, and GluR7 (GluR5/6/7) demonstrated that immunoreactivity for these two receptor classes was highly colocalized in a great majority of the pyramidal neurons in this region but present in only a minority of neurochemically identified subclasses of GABAergic interneurons. Furthermore, GluR2/3 immunoreactivity had principally a somatic distribution whereas GluR5/6/7 labeling was predominately found in the perikarya and/or particular dendritic domains. In contrast, intense GluR1 labeling was observed in a small subpopulation of interneurons and low GluR1 immunoreactivity was present in many other cortical neurons. These results demonstrate that there is a high degree of specificity in the distribution of AMPA/kainate and kainate receptor-class proteins to subclasses of neurons within the neocortex. A neuron's combination of excitatory amino acid receptor subunits may regulate its response to excitatory inputs and further defines the role of identified subclasses of neurons in the complex circuitry of the cerebral cortex and may also indicate the basis for the apparent cellular selectivity of excitotoxic degenerative processes.

the journal of neuroscience/the journal of neuroscience

Quantitative localization of AMPA/kainate and kainate glutamate receptor subunit immunoreactivity in neurochemically identified subpopulations of neurons in the prefrontal cortex of the macaque monkey