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In this study we have examined the effects of TRH, thyroid hormones and dopamine on the rat anterior pituitary content of neuromedin U-like immunoreactivity. Oral administration of TRH (20 mg/100 g per day) to euthyroid animals evoked a fivefold increase in peptide content after 12 days of treatment. This effect was found to be dependent upon circulating levels of thyroid hormone, since administration of TRH to thyroidectomized animals failed to show a similar effect without simultaneous treatment with tri-iodothyronine. The possibility that the TRH-induced increase in anterior lobe neuromedin U content reflected alterations in prolactin secretion or synthetic rate was also examined. Treatment of euthyroid animals with a dopamine agonist and antagonist was, however, without effect. These results demonstrate a unique relationship between TRH and thyroid hormone levels in increasing the anterior lobe content of neuromedin U immunoreactivity.

Journal of Endocrinology (1989) 122, 471–476

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