Increase in c-erbAα2 mRNA in the parvocellular region of the paraventricular nucleus of the hypothalamus following thyroidectomy in the adult male rat

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To examine thyroid hormone regulation of c-erbA alpha 2 mRNA expression in the parvo-cellular region of the paraventricular nucleus of the rat hypothalamus (pPVN), quantitative in situ hybridization was performed using 3H-labeled probe complementary to c-erbA alpha 2 mRNA. Thyroidectomy induced a significant increase in the number of silver grains overlying the cytoplasm in the pPVN relative to sham-operated controls. This effect was prevented by daily injection of thyroxine. These results indicate that hypothyroidism induced an increase in cellular c-erbA alpha 2 mRNA level in the pPVN.

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