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Catecholamines and pituitary function. IV. Effects of low-dose dopamine infusion and long-term bromocriptine treatment on the abnormal thyrotroph (TSH) dynamics in patients with pathological hyperprolactinaemia.
Acta Endocrinol (Copenh) 1986; 111(2):154-61AE

Abstract

In order to gain further insight into the role of dopamine (DA) in the control of TSH release and to investigate whether an increased or defective DA inhibition on pituitary thyrotrophs may be considered responsible for the abnormal TSH dynamics in pathological hyperprolactinaemia, we examined the effect of low-dose DA infusion on TRH stimulated TSH secretion in normally cycling women and in patients with pathological hyperprolactinaemia. The effect of long-term bromocriptine therapy on TSH dynamics was also evaluated in a selected group of hyperprolactinaemic women. Fifty-two hyperprolactinaemic patients with no other signs of pituitary or thyroid dysfunction had significantly higher mean TSH serum concentrations and mean TSH peak values after TRH administration than 75 healthy controls. Furthermore, the TSH rises induced by the DA-synthesis inhibitor alpha-methyl-p-tyrosine (AMPT, 500 mg orally) were enhanced in both prolactinoma and 'idiopathic hyperprolactinaemia' patients as compared with controls. There was a positive correlation between the TRH- and AMPT-induced TSH rises in the hyperprolactinaemic group. Low-dose DA infusion (0.1 microgram/kg X min) reduced TSH response to TRH in both regularly cycling women and patients with hyperprolactinaemic amenorrhoea. Longterm bromocriptine therapy (2.5 mg tid over 60-150 days) not only normalized serum Prl levels, but also reduced the TSH response to TRH in 7 hyperprolactinaemic women who had presented exaggerated TSH responses to the basal TRH test.(

ABSTRACT

TRUNCATED AT 250 WORDS)

Authors

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Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

3082094

Citation

Nicoletti, I, et al. "Catecholamines and Pituitary Function. IV. Effects of Low-dose Dopamine Infusion and Long-term Bromocriptine Treatment On the Abnormal Thyrotroph (TSH) Dynamics in Patients With Pathological Hyperprolactinaemia." Acta Endocrinologica, vol. 111, no. 2, 1986, pp. 154-61.
Nicoletti I, Filipponi P, Fedeli L, et al. Catecholamines and pituitary function. IV. Effects of low-dose dopamine infusion and long-term bromocriptine treatment on the abnormal thyrotroph (TSH) dynamics in patients with pathological hyperprolactinaemia. Acta Endocrinol. 1986;111(2):154-61.
Nicoletti, I., Filipponi, P., Fedeli, L., Ambrosi, F., Giammartino, C., Spinozzi, F., & Santeusanio, F. (1986). Catecholamines and pituitary function. IV. Effects of low-dose dopamine infusion and long-term bromocriptine treatment on the abnormal thyrotroph (TSH) dynamics in patients with pathological hyperprolactinaemia. Acta Endocrinologica, 111(2), pp. 154-61.
Nicoletti I, et al. Catecholamines and Pituitary Function. IV. Effects of Low-dose Dopamine Infusion and Long-term Bromocriptine Treatment On the Abnormal Thyrotroph (TSH) Dynamics in Patients With Pathological Hyperprolactinaemia. Acta Endocrinol. 1986;111(2):154-61. PubMed PMID: 3082094.
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TY - JOUR T1 - Catecholamines and pituitary function. IV. Effects of low-dose dopamine infusion and long-term bromocriptine treatment on the abnormal thyrotroph (TSH) dynamics in patients with pathological hyperprolactinaemia. AU - Nicoletti,I, AU - Filipponi,P, AU - Fedeli,L, AU - Ambrosi,F, AU - Giammartino,C, AU - Spinozzi,F, AU - Santeusanio,F, PY - 1986/2/1/pubmed PY - 1986/2/1/medline PY - 1986/2/1/entrez SP - 154 EP - 61 JF - Acta endocrinologica JO - Acta Endocrinol. VL - 111 IS - 2 N2 - In order to gain further insight into the role of dopamine (DA) in the control of TSH release and to investigate whether an increased or defective DA inhibition on pituitary thyrotrophs may be considered responsible for the abnormal TSH dynamics in pathological hyperprolactinaemia, we examined the effect of low-dose DA infusion on TRH stimulated TSH secretion in normally cycling women and in patients with pathological hyperprolactinaemia. The effect of long-term bromocriptine therapy on TSH dynamics was also evaluated in a selected group of hyperprolactinaemic women. Fifty-two hyperprolactinaemic patients with no other signs of pituitary or thyroid dysfunction had significantly higher mean TSH serum concentrations and mean TSH peak values after TRH administration than 75 healthy controls. Furthermore, the TSH rises induced by the DA-synthesis inhibitor alpha-methyl-p-tyrosine (AMPT, 500 mg orally) were enhanced in both prolactinoma and 'idiopathic hyperprolactinaemia' patients as compared with controls. There was a positive correlation between the TRH- and AMPT-induced TSH rises in the hyperprolactinaemic group. Low-dose DA infusion (0.1 microgram/kg X min) reduced TSH response to TRH in both regularly cycling women and patients with hyperprolactinaemic amenorrhoea. Longterm bromocriptine therapy (2.5 mg tid over 60-150 days) not only normalized serum Prl levels, but also reduced the TSH response to TRH in 7 hyperprolactinaemic women who had presented exaggerated TSH responses to the basal TRH test.(ABSTRACT TRUNCATED AT 250 WORDS) SN - 0001-5598 UR - https://www.unboundmedicine.com/medline/citation/3082094/Catecholamines_and_pituitary_function__IV__Effects_of_low_dose_dopamine_infusion_and_long_term_bromocriptine_treatment_on_the_abnormal_thyrotroph__TSH__dynamics_in_patients_with_pathological_hyperprolactinaemia_ DB - PRIME DP - Unbound Medicine ER -