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Neurotransmitter control of hypothalamic-pituitary-thyroid function in rats



Neurotransmitter control of hypothalamic-pituitary-thyroid function in rats



European Journal of Pharmacology 70(3): 263-271



The possible roles of monoamine neurotransmitters in the regulation of the hypothalamic-pituitary-thyroid axis were examined in the rat. Rats were treated acutely and repeatedly with drugs which are presumed to alter neurotransmitter functional activity. These drugs include neurotransmitter precursors (tryptophan and L-DOPA), synthesis inhibitors (p-chlorophenylalanine and alpha-methyltyrosine), uptake inhibitors (desipramine and zimelidine) and lithium carbonate. The hormone levels measured were hypothalamic TRH and SLI content and serum TSH, T4 and T3. We conclude that augmented serotonergic or dopaminergic activity may inhibit TRH release, but that release from these inhibitions is not sufficient to stimulate TRH release. The release of TRH seems to be mediated by norepinephrine. Lithium treatment results in increased hypothalamic TRH.

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Accession: 043736236

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PMID: 6112152


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