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
中科院分区:
文献类型:
--
作者:
DIEGUEZ, C;JORDAN, V;SCANLON, MF
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.