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Nomifensine decreases the thyroid-stimulating-hormone response to thyrotropin-releasing-hormone in normal subjects

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Abstract

The Thyroid-stimulating-hormone (TSH) secretion has been studied in 12 normal euthyroid subjects (4 males, 8 females) after nomifensine (NOM) administration (200 μg po). NOM is a drug which activates dopaminergic neurotransmission at the Central Nervous System level. Blood samples were drawn every h for4 h after NOM or placebo, respectively. At the4th hour thyrotropin-releasing-hormone (TRH) was administered in bolus (200 jug iv), in both studies, and additional samples were collected for 90 min. The results show a moderate suppression (NS) of TSH and a clear-cut reduction in the secretory response to TRH after NOM administration (secretory area: TRH after placebo 723 ± 132, TRH after NOM 400 ± 83; p < 0.01 ). The data appear to confirm that dopaminergic neurotransmission exerts an inhibitory role upon TSH secretion. The mechanism by which NOM induced dopaminergic activation leads to the suppression of TSH release after TRH has not yet been elucidated. An interference in TSH storage and/or in the post receptor mechanisms involved in TRH action might be hypothesized.

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Authors and Affiliations

  1. Cattedra di Endocrinologia, Università di Genova, Viale Benedetto XV, 6, 16132, Genova, Italy

    M. Giusti, G. Mazzocchi, D. Mignone, W. Tarditi & G. Giordano

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  1. M. Giusti
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  2. G. Mazzocchi
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  3. D. Mignone
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  4. W. Tarditi
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  5. G. Giordano
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Giusti, M., Mazzocchi, G., Mignone, D. et al. Nomifensine decreases the thyroid-stimulating-hormone response to thyrotropin-releasing-hormone in normal subjects. J Endocrinol Invest 6, 125–128 (1983). https://doi.org/10.1007/BF03350584

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