Paradoxical elevation of growth hormone by intraventricular somatostatin: possible ultrashort-loop feedback.

Paradoxical elevation of growth hormone by intraventricular somatostatin: possible ultrashort-loop feedback.
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心室内生长抑素对生长激素的反常升高:可能的超短环反馈。

DOI:
10.1126/science.6110244
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发表时间:
1981
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
McCann,SM
McCann,SM
中科院分区:
--
文献类型:
--
作者:
Lumpkin,MD;Gegro-Vilar,A;McCann,SM

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生长抑素,生长激素抑制因子,当微量注射到大鼠脑的第三脑室,矛盾地诱导生长激素的释放。垂体的作用部位已被排除,这一结果支持的概念,即外源性生长抑素在下丘脑内的行为,以抑制生长抑素从含生长抑素的神经元的释放,可能通过超短环反馈机制,或增加下丘脑生长抑素释放因子的释放,从而诱导生长激素的释放。第三脑室注射生长抑素也可降低血浆促黄体生成素、促卵泡激素和促甲状腺激素的浓度,可能是通过抑制促黄体生成素释放因子和促甲状腺激素释放因子的释放。
Somatostatin, the growth hormone-inhibiting factor, when microinjected into the third ventricle of the rat brain, paradoxically induced the release of growth hormone. A pituitary site of action having been ruled out, this result supports the concept that exogenous somatostatin within the hypothalamus acts either to suppress the release of somatostatin from somatostatin-containing neurons, possibly via an ultrashort-loop feedback mechanism, or to augment release of hypothalamic growth hormone-releasing factor, thereby inducing a release of growth hormone. Injection of somatostatin into the third ventricle also decreased plasma concentrations of luteinizing hormone, follicle-stimulating hormone, and thyroid-stimulating hormone, probably by inhibiting the release of luteinizing hormone-releasing factor and thyrotropin-releasing factor.
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