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- W2169374986 abstract "Deficiency of thyroid hormone (TH) during the perinatal period results in severe neurological abnormalities in rodent cerebellar development. However, the molecular mechanisms of TH action in the developing cerebellum are not fully understood. Of note, a mutant mouse, staggerer, in which the orphan nuclear hormone receptor ROR alpha gene is disrupted, exhibits cerebellar abnormalities similar to those seen in the hypothyroid animals, despite normal thyroid function. We, therefore, speculated that TH (tetraiodo-L-thyronine; T4) may regulate ROR alpha gene expression, which then may regulate genes essential for normal brain development. To test this hypothesis, we studied the changes in ROR alpha gene expression in perinatal hypothyroid rat cerebellum and the effect of TH replacement using Northern blot analysis, ribonuclease protection assay and in situ hybridization histochemistry. During cerebellar development, an approximately 3-fold increase in the cerebellar content of ROR alpha messenger RNA (mRNA) was seen in both propylthiouracil-treated, and propylthiouracil-treated and T4-replaced animals. However, the increase was accelerated when T4 was injected, although the ROR alpha mRNA content was identical, with or without T4, by 30 days after birth (P30). In contrast, T4 treatment suppressed the TH receptor alpha1 and c-erbA alpha2 mRNA content by P30; retinoic acid X receptor-beta mRNA content was not influenced by thyroid status. A significant hybridization signal for ROR alpha mRNA was seen only over Purkinje cells in the cerebellar cortex by in situ hybridization histochemistry. These results indicate that TH alters the timing of expression of the ROR alpha gene in the Purkinje cells of the cerebellar cortex, which may, in turn, influence Purkinje cell differentiation." @default.
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- W2169374986 date "1998-05-01" @default.
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- W2169374986 title "RORα Gene Expression in the Perinatal Rat Cerebellum: Ontogeny and Thyroid Hormone Regulation<sup>1</sup>" @default.
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- W2169374986 doi "https://doi.org/10.1210/endo.139.5.6013" @default.
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