Calcium alters the acyl chain composition and lipid fluidity of rat hepatocyte plasma membranes in vitro.

Calcium alters the acyl chain composition and lipid fluidity of rat hepatocyte plasma membranes in vitro.
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钙在体外改变大鼠肝细胞质膜的酰基链组成和脂质流动性。

DOI:
10.1016/0005-2736(85)90322-0
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发表时间:
1985
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Schachter,D
Schachter,D
中科院分区:
--
文献类型:
--
作者:
Storch,J;Schachter,D

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钙离子通过调节改变脂质组成的膜酶的活性来降低离体大鼠肝细胞质膜的脂质流动性。为了探索阳离子影响的机制,使用八种荧光团通过估计稳态荧光偏振或准分子荧光强度来评估脂质流动性。结果表明,流动性的降低发生在双层的疏水内部,并且流动性的动态和静态(脂质顺序)成分均受到钙处理的影响。膜脂分析表明,钙处理降低了极性脂质部分的花生四烯酸含量,从而降低了脂肪酸的双键指数。这种成分变化预计会降低脂质流动性,可能是由于内源性肝细胞质膜磷脂酶 A2 的钙激活所致。
Calcium ion decreases the lipid fluidity of isolated rat hepatocyte plasma membranes by modulating the activity of membrane enzymes which alter the lipid composition. To explore the mechanism of the effect of the cation, eight fluorophores were used to assess lipid fluidity via estimations of either steady-state fluorescence polarization or excimer fluorescence intensity. The results demonstrate that the reduction in fluidity occurs in the hydrophobic interior of the bilayer and that both the dynamic and static (lipid order) components of fluidity are affected by treatment with calcium. Analysis of the membrane lipids demonstrates that calcium treatment decreases the arachidonic acid content of the polar lipid fraction and, thereby, reduces the double-bond index of the fatty acids. This change in composition, which is expected to reduce the lipid fluidity, may result from activation by calcium of the endogenous hepatocyte plasma membrane phospholipase A2.
合成溶血卵磷脂类似物对磷脂酰乙醇胺和磷脂酰胆碱混合物相变的影响
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