Induced Ca2+ release in skeletal muscle sarcoplasmic reticulum by sulfhydryl reagents and chlorpromazine.

Induced Ca2+ release in skeletal muscle sarcoplasmic reticulum by sulfhydryl reagents and chlorpromazine.
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巯基试剂和氯丙嗪诱导骨骼肌肌浆网中 Ca2 释放。

DOI:
10.1016/0003-9861(83)90164-9
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发表时间:
1983
影响因子:
3.9
通讯作者:
Fleischer,S
Fleischer,S
中科院分区:
生物学3区
文献类型:
--
作者:
Bindoli,A;Fleischer,S

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肌浆网是肌肉中的一种特殊膜系统,参与 Ca2+ 的能量吸收、储存和释放。使用Ellman试剂测量正常和重建肌浆网的巯基含量。对于这两种制剂,我们发现在不存在和存在十二烷基硫酸钠的情况下,每摩尔钙泵蛋白含有 17 和 26 mol 巯基。肌浆网释放 Ca2+ 会触发肌肉收缩,可能涉及通道的调节。本报告涉及研究离体肌浆网中 Ca2+ 释放的实验方法。我们发现巯基制剂(其中水溶性汞最有效)诱导 Ca2+ 释放。氯丙嗪与巯基试剂具有协同作用。与预加载但未经处理的肌浆网中的钙渗漏相比,最佳条件下的 Ca2+ 释放非常快。 Ca2+ 的快速释放表明通道的打开。汞释放的 Ca2+ 保留在重建的肌浆网膜囊泡中。
Sarcoplasmic reticulum is a specialized membrane system in muscle involved in the energized uptake, storage, and release of Ca2+. The sulfhydryl content of normal and reconstituted sarcoplasmic reticulum was measured using Ellman reagent. For both preparations, we find 17 and 26 mol sulfhydryls per mole calcium pump protein assayed in the absence and presence of sodium dodecyl sulfate. The release of Ca2+from sarcoplasmic reticulum, which triggers muscle contraction, likely involves the regulation of a channel. This report deals with an experimental approach to studying the Ca2+release in isolated sarcoplasmic reticulum. We find that sulfhydryl agents of which water-soluble mercurials were most effective induce Ca2+release. Chlorpromazine acts synergistically with the sulfhydryl reagents. Ca2+release under optimal conditions is very rapid compared with calcium leakage from preloaded but untreated sarcoplasmic reticulum. The imposed rapid release of Ca2+is suggestive of the opening of a channel. Ca2+release by mercurials is retained in reconstituted sarcoplasmic reticulum membrane vesicles.
DOI: 10.1093/oxfordjournals.jbchem.a133529
发表时间: 1981
影响因子: 2.7
作者:
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