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prolactinoma/potassio
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9 risultati
Perifusion studies of bromocriptine-treated and untreated macroprolactinomas: effects of dopamine, bromocriptine and TRH.
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There have been no detailed in-vitro studies of PRL secretion by human macroprolactinoma cells exposed to bromocriptine (BC) to within a few days of surgical removal. We have studied cells from four such tumours (serum PRL 7.05-247 U/l) and six untreated tumours (serum PRL 4-80.35 U/l) using a
The effects of hypokalaemia on the hormone exocytosis in adenohypophysis and prolactinoma cell culture model systems.
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The extracellular ion milieu determines the exocytosis mechanism that is coupled to spontaneous electrical activity. The K(+) ion plays crucial role in this mechanism: as the potassium current is associated with membrane hyperpolarization and hormone release through protein cascade activation. The
The electrical properties of isolated human prolactin-secreting adenoma cells and their modification by dopamine.
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Human prolactinoma cells were maintained in culture for a period of at least 8 days and were able to secrete PRL in large amounts. This secretion was inhibited by bromocriptine, an agonist of dopaminergic receptors, in a dose-dependent manner. The cells showed electrical activity (action potentials)
Treatment of macroprolactinoma with the new potent non-ergot D2-dopamine agonist quinagolide and effects on prolactin levels, pituitary function, an the renin-aldosterone system. Results of a clinical long-term study.
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The oral non-ergot D2-dopamine agonist quinagolide (CV 205-502, CAS 87056-78-8) has proven to be highly effective in suppressing elevated prolactin (PRL) levels. It was the aim of this study to search for possible interference of the drug with other endocrine systems which are partly under
Thyroxine 5'-deiodinase in human anterior pituitary tumors.
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The activity of T4 5'-monodeiodinase (5'D) in the pituitary was measured in 12 patients with pituitary adenoma (3 patients with acromegaly, 2 with prolactinoma, 1 with Cushing's disease, 1 with TSH-producing tumor, and 5 with nonfunctioning tumor) and, as a control, in a patient who died of parotid
[Membrane receptors and coupling proteins in adenohypophyseal cells].
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Dopamine receptors of D2 type present on lactotroph cells are coupled to a large series of transduction mechanisms. Beside their negative coupling with adenylate cyclase, they are also coupled with potassium and calcium channels, leading to a decreased intracellular calcium concentration. In
D2 dopaminergic receptors: normal and abnormal transduction mechanisms.
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Dopamine receptors of D2 type present on lactotroph cells are coupled to a large series of transduction mechanisms. Beside their negative coupling with adenylate cyclase, they are also coupled with potassium and calcium channels, leading to a decreased intracellular calcium concentration. In
Effect of zinc administration on thyrotropin releasing hormone-stimulated prolactinemia in healthy men.
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Previous in vitro studies have demonstrated zinc (Zn++) inhibition of basal and of potassium (K+) or thyrotropin-releasing hormone (TRH)-stimulated prolactin (PRL) secretion, in a selective, reversible, and dose-dependent manner. Thus, Zn++ may regulate physiologically pituitary PRL secretion.
Indirect evidence to suggest that prolactin induces salt retention in cirrhosis.
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Prolactin is known to have renal sodium retention properties in animals. In man, only two studies have suggested a similar effect in healthy volunteers or in patients with microprolactinoma. Since hyperprolactinemia is frequently observed in liver disease, this prospective study of 19 patients
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