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Development of beta 1 and beta 2 adrenergic receptors in baboon brain an autoradiographic study using iodine 125 iodocyanopindolol


Journal of Comparative Neurology 273(3): 318-329
Development of beta 1 and beta 2 adrenergic receptors in baboon brain an autoradiographic study using iodine 125 iodocyanopindolol
[125I]iodocyanopindolol (ICYP) autoradiography was used to investigate the temporal development and distribution of .beta.1 and .beta.2 receptors in brains of baboons at ages embryonic day 100 (E100), full-term gestation (E18O), and 3 years. In all brain regions examined, with the exception of the hippocampus, binding to .beta.1 receptors exceeded that to .beta.2 receptors. The highest densities of .beta.1 receptors were found in the caudate nucleus, putamen, globus pallidus, substantia nigra, and cerebral cortex; intermediate receptor densities were observed in most nuclei of thalamus, and the lowest concentrations were in the hippocampus. At E100, .beta. receptors were identified in the striatum, globus pallidus, and thalamus. During maturation, the number of .beta.1 receptors declined in cortical areas but increased in the head of the caudate and putamen. Significant differences in the developmental distribution of .beta. receptors during development were also detected: at E100 and E180 .beta.1 receptors appeared as patches in the caudate and putamen, but by 3 years of age they were more homogeneously distributed in both regions; changes also occurred in the distribution of binding within cortical layers. Autoradiograms of [125I]ICYP and [3H]mazindol binding show overlapping patches of labeling in the E180 striatum, suggesting a possible developmental association between .beta. receptors and dopamine high-affinity uptake carrier sites. This study demonstrates that noradrenergic receptors in the primate forebrain undergo significant developmental reorganization with regional variations.

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Accession: 005132721



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