GROWTH-HORMONE RESPONSES TO GROWTH HORMONE-RELEASING FACTOR (1-29) IN EUTHYROID, HYPOTHYROID AND HYPERTHYROID RATS

GROWTH-HORMONE RESPONSES TO GROWTH HORMONE-RELEASING FACTOR (1-29) IN EUTHYROID, HYPOTHYROID AND HYPERTHYROID RATS
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DOI:
10.1677/joe.0.1090053
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发表时间:
1986-04-01
影响因子:
4
通讯作者:
SCANLON, MF
SCANLON, MF
中科院分区:
医学2区
文献类型:
--
作者:
DIEGUEZ, C;JORDAN, V;SCANLON, MF

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为了调查与甲状腺功能减退和甲状腺功能亢进相关的 GH 分泌受损是否是由于下丘脑或垂体疾病所致,我们研究了甲状腺功能正常、甲状腺功能减退和甲状腺功能亢进大鼠的血浆 GH 对 GH 释放因子 (1-29) (GRF) 的反应。甲状腺功能减退大鼠在 5 分钟(350 .+-. 35 与 1950 .+-. 260 .mu.g/l)、10 分钟(366 .+-. 66 与 2320 .+-. 270 .mu.g/l)和与甲状腺功能正常的大鼠相比,GRF注射后15分钟(395.+-.72 vs 1420.+-.183.mu.g/l;平均值.+-.S.E.M)。甲状腺机能亢进大鼠在 30 分钟后对 5 μg GRF/kg 表现出 GH 反应显着(P < 0.05)下降(200.+-.14 vs 325.+-.35.mu.g/l),但在其他时间点或施用 1.mu.g GRF/kg 后没有。这些数据表明,在甲状腺功能减退症和可能的甲状腺功能亢进症以及可能的甲状腺功能亢进症中,生长激素细胞对GRF施用的反应性发生改变。
In order to investigate whether the impaired GH secretion associated with hypothyroidism and hyperthyroidism is due to a hypothalamic or a pituitary disorder, we have studied plasma GH responses to GH-releasing factor (1-29) (GRF) in euthyroid, hypothyroid and hyperthyroid rats. Hypothyroid rats showed a significant (P < 0.001) reduction in GH responses to GRF (5 .mu.g/kg) at 5 min (350 .+-. 35 vs 1950 .+-. 260 .mu.g/l), 10 min (366 .+-. 66 vs 2320 .+-. 270 .mu.g/l) and 15 min after GRF injection (395 .+-. 72 vs 1420 .+-. 183 .mu.g/l; means .+-. S.E.M) compared with euthyroid rats. Hyperthyroid rats showed a significant (P < 0.05) decrease in GH responses to 5 .mu.g GRF/kg after 30 min (200 .+-. 14 vs 325 .+-. 35 .mu.g/l) but not at other time-points, or after the administration of 1 .mu.g GRF/kg. These data indicate that in hypothyroidism and perhaps hyperthyroidism and perhaps hyperthyroidism there is an alteration in the responsiveness of the somatotroph to GRF administration.