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Localization of dopamine D4 receptors in GABAergic neurons of the primate brain

Abstract

DOPAMINE receptors are the principal targets of drugs used in the treatment of schizophrenia1. Among the five mammalian dopamine-receptor subtypes, the D4 subtype is of particular interest because of its high affinity for the atypical neuroleptic clozapine1–3. Interest in clozapine stems from its effectiveness in reducing positive and negative symptoms in acutely psychotic and treatment-resistant schizophrenic patients without eliciting extrapyramidal side effects4. We have produced a subtype-specific antibody against the D4 receptor and localized it within specific cellular elements and synaptic circuits of the central nervous system. The D4-receptor antibody labelled GABAergic neurons in the cerebral cortex, hippocampus, thalamic reticular nucleus, globus pallidus and the substantia nigra (pars reticulata). Labelling was also observed in a subset of cortical pyramidal cells. Our findings suggest that clozapine's beneficial effects in schizophrenia may be achieved, in part, through D4-mediated GABA modulation, possibly implicating disinhibition of excitatory transmission in intrinsic cortical, thalamocortical and extrapyramidal pathways.

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Mrzljak, L., Bergson, C., Pappy, M. et al. Localization of dopamine D4 receptors in GABAergic neurons of the primate brain. Nature 381, 245–248 (1996). https://doi.org/10.1038/381245a0

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