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
VAGENAKIS, AG
中科院分区:
医学1区
文献类型:
--
作者:
HARRIS, ARC;CHRISTIANSON, D;VAGENAKIS, AG

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促甲状腺素释放激素(TRH)在调节促甲状腺素(TSH)和催乳素(Prl)分泌中的生理作用尚未得到证实。刺激其释放需要药理学剂量的TRH。下丘脑病变通常引起TSH分泌抑制和Prl升高。为了确定TRH对大鼠TSH和Prl分泌是否必需,我们通过留置心房导管给予正常大鼠、去甲状腺大鼠、冷暴露大鼠和发情前大鼠TRH抗血清(TRH- ab)或正常兔血清0.1 ml。术前和术后定期抽取血清样本。这些动物的血清TSH在注射正常兔血清后24小时内没有下降。在所有正常(基础,41 .+-)小鼠中,给予TRH-Ab后血清TSH显著降低。8 .mu。U[微微]/ml[平均值。SE);30分钟,6 .+。2;45分钟,8。3;75分钟,4 .+。2);甲状腺切除(基底,642 +-。32 .mu.U /毫升;30分钟,418 +。32;60分钟,426 +。36个;120分钟,516 +-。146);冷应力(基部,68 .+-。19 .mu.U /毫升;30分钟,4 .+-。3;180分钟,16 .+。8);和发情期(基础,上午11点,57。10 .mu.U /毫升;下午1点,20。3;13日下午3点。4;19日下午5点。3)老鼠。TRH-Ab (0.1 ml)对正常或去甲状腺大鼠的基础Prl浓度没有影响,也不能阻止暴露在寒冷环境中的大鼠的Prl升高(basal, 68。7 ng / ml;15分钟,387 +-。121年;30分钟,212 +-。132年;60分钟,154。114),或者在发情前的下午观察到的Prl激增(上午11点,23。2 ng / ml;下午1点。55;下午3点,1490。260年;下午5点,1570。286)。正常大鼠、冷暴露大鼠和发情前期大鼠的TSH分泌显然需要TRH,并且至少部分地促进甲状腺功能减退大鼠的TSH分泌,但在这些状态下Prl分泌不需要TRH。
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.