Regulation of Hormone Secretion by Acute Cell Volume Changes: Ca2+-Independent Hormone Secretion

Regulation of Hormone Secretion by Acute Cell Volume Changes: Ca2+-Independent Hormone Secretion
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急性细胞体积变化对激素分泌的调节:Ca2 依赖性激素分泌

DOI:
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发表时间:
2001
影响因子:
--
通讯作者:
M. Greer
M. Greer
中科院分区:
医学1区
文献类型:
--
作者:
V. S̆trbák;M. Greer

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囊泡内物质的胞吐作用应通过与囊泡膜融合扩大质膜来帮助细胞应对相对的细胞外低渗挑战。细胞肿胀引起储存在分泌囊泡中的激素的立即分泌爆发,其动态与特定促分泌剂诱导的动态无法区分。细胞肿胀诱导的激素分泌与 cAMP、IP3 或前列腺素的升高无关,并且不会因拉伸机械受体或水通道蛋白通道的抑制而降低。与大多数类型的调节分泌相反,正常细胞中细胞肿胀诱导的分泌不需要通过打开 L 型 Ca2+ 通道来增加细胞内 Ca2+。然而,这种 Ca2+ 流入对于肿瘤来源的垂体细胞中细胞肿胀诱导的分泌至关重要。细胞肿胀诱导胞吐物质的普遍分泌。然而,专门负责渗透调节的细胞的反应是不同的。可能的生理意义:4% 低渗挑战会持续刺激分泌。渗透压的波动以及由此产生的细胞体积变化可能对激素分泌具有重要的调节作用。释放的激素也可能在缺血的病理生理学中发挥重要作用。胞吐作用本身在容量调节中并不起重要作用。
Exocytosis of intravesicular material should help a cell meet a relative extracellular hyposmotic challenge by expanding the plasmalemma through fusion with vesicular membrane. Cell swelling evokes an immediate secretory burst of hormones stored in secretory vesicles with dynamics indistinguishable from those induced by specific secretagogues. Hormone secretion induced by cell swelling is not associated with a rise in cAMP, IP3, or prostaglandins, and it is not depressed by inhibition of stretch mechano-receptors or aquaporin channels. In contrast to most types of regulated secretion, that induced by cell swelling in normal cells does not require a rise in intracellular Ca2+ through opening L-type Ca2+ channels. However, such Ca2+ influx is essential for cell-swelling induced secretion in tumor-derived pituitary cells. Cell swelling induces universal secretion of exocytotic material. The response of cells specialized in osmoregulation is, however, different. Possible physiological significance: Consistent stimulation of secretion occurs with a 4% hyposmolar challenge. It is likely that fluctuations in osmotic pressure with resultant cell volume changes have a significant regulatory role in hormone secretion. Released hormones could also play an important role in the pathophysiology of ischemia. Exocytosis itself does not have an essential role in volume regulation.
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。
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