Inhibition of liver endoplasmic reticulum calcium pump by CCl4 and release of a sequestered calcium pool.

Inhibition of liver endoplasmic reticulum calcium pump by CCl4 and release of a sequestered calcium pool.
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CCl4 抑制肝内质网钙泵并释放隔离的钙池。

DOI:
10.1016/0006-2952(86)90687-8
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发表时间:
1986
影响因子:
5.8
通讯作者:
Moore,L
Moore,L
中科院分区:
医学2区
文献类型:
--
作者:
Long,RM;Moore,L

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在CCl4给药后,在大鼠肝脏中观察到的最早的效应之一是抑制内质网中发现的依赖于ATP的钙泵。这份报告证实,在给予CCl4后,与微粒体组分相关的钙量减少,并首次证明了抑制肝微体钙泵与微粒体组分中的钙量之间存在时间、剂量和代谢依赖关系。此外,从内质网释放的钙可以引起一种细胞质酶的激活,这种酶对电离钙,即糖原磷酸化酶的增加做出反应。这表明内质网钙泵在内质网内隔离了细胞内的钙池。由于CCl4抑制了钙泵,这一钙池可能被释放到细胞质中。
One of the earliest effects observed in rat liver after CCl4administration is inhibition of an ATP-dependent calcium pump found at the endoplasmic reticulum. This report confirms that the amount of calcium associated with the microsomal fraction is reduced after CCl4administration and, for the first time, demonstrates time-, dose-, and metabolism-dependent relationships between inhibition of the liver microsomal calcium pump and the amount of calcium found in the microsomal fraction. Furthermore, release of calcium from the endoplasmic reticulum is shown to cause activation of a cytoplasmic enzyme that responds to increases of ionized calcium, glycogen phosphorylase. This suggests that the endoplasmic reticulum calcium pump sequesters an intracellular pool of calcium within the endoplasmic reticulum. This pool of calcium may be released into the cytoplasm as a consequence of inhibition of the calcium pump by CCl4.
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