Hyponatremia in rats induces downregulation of vasopressin synthesis.

Hyponatremia in rats induces downregulation of vasopressin synthesis.
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大鼠低钠血症会导致加压素合成下调。

DOI:
10.1172/jci114804
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发表时间:
1990
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Sherman,TG
Sherman,TG
中科院分区:
--
文献类型:
--
作者:
Robinson,AG;Roberts,MM;Evron,WA;Verbalis,JG;Sherman,TG

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抗利尿激素分泌不当引起的低钠血症是人类病理生理中一种常见的疾病,但对低渗时抗利尿激素的合成尚未进行研究。我们采用一种新的方法定量测定大鼠在给药dDAVP(一种抗利尿激素激动剂)和流食诱导低钠血症后3、7和14 d抗利尿激素的合成。抗利尿激素的合成在第7天完全停止。下丘脑的抗利尿激素mRNA水平与合成的减少平行,并且含量仅降至对照大鼠的10-15%。当低钠血症通过停用dDAVP得到纠正时,抗利尿激素mRNA在7天内缓慢恢复正常。观察到抗利尿激素的合成可以完全关闭,从而得出以下结论:在正常生理条件下,神经垂体是长期上调的;加压素的合成(和释放)必须有一个渗透阈值;垂体后叶中大量储存的激素对抗利尿激素在合成减少时的可用性至关重要;最后,当抗利尿激素在低渗状态下分泌(和合成)时,在临床疾病中必须存在一些非渗透压刺激。图片
Hyponatremia due to inappropriate secretion of vasopressin is a common disorder in human pathophysiology, but vasopressin synthesis during hypoosmolality has not been investigated. We used a new method to quantitate synthesis of vasopressin in rats after 3, 7, and 14 d of hyponatremia induced by administering dDAVP (a vasopressin agonist) and a liquid diet. Vasopressin synthesis was completely turned off by 7 d. Vasopressin mRNA levels in the hypothalamus paralleled the reduction in synthesis and were reduced to levels of only 10-15% of the content in control rats. When hyponatremia was corrected by withdrawal of dDAVP, vasopressin mRNA slowly returned to normal over 7 d. The observation that vasopressin synthesis can be so completely turned off leads to several conclusions: under normal physiological conditions the neurohypophysis is chronically upregulated; there must be an osmotic threshold for initiation of vasopressin synthesis (and release); the large store of hormone in the posterior pituitary is essential for vasopressin to be available during times of decreased synthesis; and, finally, some nonosmolar stimulus for synthesis must be present during clinical disorders when vasopressin is secreted (and synthesized) despite hypoosmolality.Images
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