A detailed mapping of dopamine D-2 receptors in rat central nervous system by autoradiography with [125I]iodosulpride.

M L BouthenetJ C Schwartz


The benzamide derivative [125I]iodosulpride was used to generate light microscopic autoradiograms on sections of rat brain and spinal cord. Sites specifically labelled by [125I]iodosulpride over a low background correspond to dopamine D-2 receptors as shown by their pharmacology established by densitometric analysis of 11 typical areas from autoradiograms generated in the presence of five dopamine-competing agents. An atlas of D-2 receptors was established using 1 horizontal, 6 sagittal and 30 frontal sections, the latter serially prepared at 0.5-1 mm intervals. Labelled areas were identified by comparison with corresponding, classically stained sections. When their density, rated according to an arbitrary scale, was then compared to that previously reported for dopamine innervation, evaluated from distributional maps of dopamine histofluorescence or tyrosine hydroxylase immunoreactivity, three situations were found. In areas corresponding to cells of origin and established projection fields of the mesostriatal, mesolimbocortical, diencephalospinal and periglomerular systems the density of D-2 receptors generally paralleled that of dopamine innervation. D-2 receptors in substantia nigra (pars compacta or reticulata) and ventral...Continue Reading


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