PHYSIOLOGICAL-ROLE OF THYROTROPIN-RELEASING-HORMONE IN REGULATION OF THYROID-STIMULATING HORMONE AND PROLACTIN SECRETION IN RAT
PHYSIOLOGICAL-ROLE OF THYROTROPIN-RELEASING-HORMONE IN REGULATION OF THYROID-STIMULATING HORMONE AND PROLACTIN SECRETION IN RAT
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DOI:
10.1172/jci108955
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发表时间:
1978-01-01
影响因子:
15.9
通讯作者:
VAGENAKIS, AG
中科院分区:
文献类型:
--
作者:
HARRIS, ARC;CHRISTIANSON, D;VAGENAKIS, AG
The physiological role of thyrotropin-releasing hormone (TRH) in the regulation of thyrotropin (TSH) and prolactin (Prl) secretion is not proven. Stimulation of their release requires pharmacologic doses of TRH. Lesions of the hypothalamus usually induce an inhibition of TSH secretion and an increase in Prl. To determine whether TRH is essential for TSH and Prl secretion in the rat, 0.1 ml of TRH antiserum (TRH-Ab) or normal rabbit serum was administered to normal, thyroidectomized, cold-exposed and proestrus rats through an indwelling atrial catheter. Serum samples were obtained before and at frequent intervals thereafter. Serum TSH in these animals was not depressed in specimens obtained up to 24 h after injection of normal rabbit serum. Serum TSH was significantly decreased after the administration of TRH-Ab in all normal (basal, 41 .+-. 8 .mu.U[microunits]/ml [mean .+-. SE]; 30 min, 6 .+-. 2; 45 min, 8 .+-. 3; 75 min, 4 .+-. 2); thyroidectomized (basal, 642 .+-. 32 .mu.U/ml; 30 min, 418 .+-. 32; 60 min, 426 .+-. 36; 120 min, 516 .+-. 146); cold-stressed (basal, 68 .+-. 19 .mu.U/ml; 30 min, 4 .+-. 3; 180 min, 16 .+-. 8); and proestrus (basal, 11 a.m., 57 .+-. 10 .mu.U/ml; 1 p.m., 20 .+-. 3; 3 p.m., 13 .+-. 4; 5 p.m., 19 .+-. 3) rats. TRH-Ab (0.1 ml) had no effect on basal Prl concentrations in normal or thyroidectomized rats and did not prevent the Prl rise in rats exposed to cold (basal, 68 .+-. 7 ng/ml; 15 min, 387 .+-. 121; 30 min, 212 .+-. 132; 60 min, 154 .+-. 114), or the Prl surge observed on the afternoon of proestrus (basal 11 a.m., 23 .+-. 2 ng/ml; 1 p.m., 189 .+-. 55; 3 p.m., 1,490 .+-. 260; 5 p.m., 1,570 .+-. 286). TRH is apparently required for TSH secretion in the normal, cold-exposed and proestrus rat and contributes, at least in part, to TSH secretion in the hypothyroid rat, but is not required for Prl secretion in these states.