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      Thyrotropin and Prolactin Response to Intraspinal TRH Administration in Man

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          The effect of intraspinal (i.s.) TRH administration on Prolactin (Prl) and thyrotropin stimulating hormone (TSH) serum levels was studied in order to verify the existence of a ventricular route in man for releasing factor delivery to the anterior pituitary, which has been previously reported in rats. Ten young male subjects were given 200 µg thyrotropin releasing hormone (TRH) i.s. injections and Prl and TSH were measured by radioimmunoassay (RIA) before and at various times after TRH administration. In the same subjects, an i.v. TRH test was also performed. After i.s. TRH, a prompt Prl increase (peak values at 10–30 min and return to baseline within 150 min) and a delayed increase (3–5 h following TRH injection) were observed in 7 and 5 subjects respectively, while an early elevation in serum TSH occurred in 6 subjects and a late one in other 6. In two subjects, a biphasic response of both tropins was present. Prl and TSH response to i.v. TRH was within the normal range in all cases; no late rise of the 2 hormones was observed. A kinetic experiment with <sup>125</sup>I-TRH was also carried out to elucidate the mode of i.s. vs i.v. TRH action. These results confirm in man data reported in animals which suggest that TRH can be transported from the cerebrospinal fluid (CSF) to the portal system and the hypophysis.

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          Author and article information

          S. Karger AG
          25 March 2008
          : 23
          : 3
          : 171-180
          Departments of Endocrinology, Neurology 1 and Pharmacology 2, Faculty of Medicine, University of Catania, Catania
          122665 Neuroendocrinology 1977;23:171–180
          © 1977 S. Karger AG, Basel

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          Pages: 10


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