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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Prolactin and thyroid- stimulating hormone responses to thyrotropin-releasing hormone in cases of hyperprolactinemia with normal and abnormal sella tomograms.

An intravenous bolus of 500 micrograms of thyrotropin-releasing hormone (TRH) was used to test prolactin and thyroid-stimulating hormone (TSH) responses in normoprolactinemic patients and in hyperprolactinemic patients with normal and abnormal sella turcica. The prolactin response showed a mean increment of 64.1 +/- 46.3 ng/ml in normoprolactinemic women. In patients with hyperprolactinemia, the mean increment was 14.1 +/- 22.4 ng/ml and 13.8 +/- 33.1 ng/ml for patients with normal and abnormal sella, respectively. The difference in the prolactin response between the normoprolactinemic patients and either group of hyperprolactinemic patients is significant (P less than 0.005). The mean baseline TSH in normoprolactinemic patients is significantly higher than in patients with hyperprolactinemia with normal and abnormal sella. The mean increment of TSH after TRH stimulation is significantly higher in normoprolactinemic patients than in either group of patients with hyperprolactinemia (P less than 0.005). These results suggest an inhibitory action of hypothalamic dopamine on the response of both prolactin and TSH to TRH in patients with hyperprolactinemia. The hypothalamic dopamine mechanism might also be the factor leading to suppression of baseline TSH levels in hyperprolactinemic patients. In addition, these results suggest that patients with hyperprolactinemia, with or without changes in the sella turcica, might have various degrees of the same pathology affecting the lactotropes.[1]


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