Regional distribution of nuclear T3 receptors in rat brain and evidence for preferential localization in neurons.

Abstract:

:We examined the distribution of nuclear T3 in mature rat brain with the aim of determining specific targets of thyroid hormones within this tissue. Saturation experiments, performed in 9 different structures of the brain and in 4 parts of the cortex, revealed the presence of a single class of binding sites with a mean Ka of 0.53 X 10(10) M-1. The highest concentrations of receptors were found in the amygdala (0.523 +/- 0.025 ng T3/mg DNA, Mean +/- SE) and the hippocampus (0.438 +/- 0.071 ng T3/mg DNA) while the lowest were in the brain stem (0.058 +/- 0.003 ng T3/mg DNA) and the cerebellum (0.079 +/- 0.026 ng T3/ml DNA). The receptor was not uniformally distributed within the cerebral cortex, its concentration being relatively high in the central sections and intermediate in the remaining portions. The cell type distribution of the T3 receptor was studied by separating glial and neuronal nuclei on a discontinuous sucrose gradient. There was no detectable specific T3 binding in the fraction of oligodendrocyte nuclei (approximately 95% pure). Conversely, the neuron-enriched fraction (approximately 60%) showed a significant increase in receptor concentration compared to total nuclei (35-40% neurons): 0.857 +/- 0.196 vs 0.511 +/- 0.095 ng T3/mg DNA (p less than 0.01) in the cortex and 0.425 +/- 0.018 vs 0.234 +/- 0.24 ng T3/mg DNA (p less than 0.01) in the forebrain. The absence of nuclear T3 receptors in oligodendrocytes may have important implications on the mechanism of action of thyroid hormone in myelination.

journal_name

J Endocrinol Invest

authors

Ruel J,Faure R,Dussault JH

doi

10.1007/BF03348511

subject

Has Abstract

pub_date

1985-08-01 00:00:00

pages

343-8

issue

4

eissn

0391-4097

issn

1720-8386

journal_volume

8

pub_type

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