Hormone secretion stimulated by ethanol-induced cell swelling in normal rat adenohypophysial cells.

Hormone secretion stimulated by ethanol-induced cell swelling in normal rat adenohypophysial cells.
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正常大鼠腺垂体细胞中乙醇诱导的细胞肿胀刺激激素分泌。

DOI:
10.1152/ajpendo.1991.260.6.e946
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发表时间:
1991
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Greer,MA
Greer,MA
中科院分区:
--
文献类型:
--
作者:
Sato,N;Wang,XB;Greer,MA

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据报道,乙醇会影响内分泌功能,但其作用机制尚不清楚。为了评估这一假设,即通过质膜乙醇渗透引起的细胞肿胀触发激素分泌,我们研究了乙醇对激素分泌和细胞体积的影响,在急性分散的大鼠腺垂体细胞在等渗和高渗条件下。等渗乙醇引起迅速的细胞肿胀和催乳素和促甲状腺激素的爆炸性分泌爆发,这与10和120 mM之间的乙醇浓度成正比。等渗乙醇的最低有效剂量为10 mM,这低于法律的中毒的血浆水平(16 mM)。去除培养基Ca 2+增强等渗乙醇诱导的细胞体积和分泌增加。高渗乙醇对这些作用无效。这些数据表明,在正常大鼠腺垂体细胞中,乙醇通过质膜快速通过引起的细胞肿胀是刺激激素分泌的有效机制,并且这种诱导的分泌受细胞外Ca 2+的负调节。
Ethanol has been reported to affect endocrine functions, but its mechanism of action is unclear. To evaluate the hypothesis that cell swelling induced by ethanol permeation through the plasmalemma triggers hormone secretion, we studied the effect of ethanol on both hormone secretion and cell volume in acutely dispersed rat adenohypophysial cells under isotonic and hypertonic conditions. Isotonic ethanol caused a prompt cell swelling and an explosive secretory burst of prolactin and thyrotropin, which were proportional to the concentration of ethanol between 10 and 120 mM. The lowest effective dose of isotonic ethanol was 10 mM, which is below the plasma levels of legal intoxication (16 mM). Removal of medium Ca2+ enhanced the isotonic ethanol-induced increases in both cell volume and secretion. Hypertonic ethanol was ineffective in these effects. These data indicate that, in normal rat adenohypophysial cells, cell swelling caused by the rapid passage of ethanol through the plasmalemma is a potent mechanism for stimulating hormone secretion and this induced secretion is negatively modulated by extracellular Ca2+.
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