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Isoflurane increases cell membrane fluidity significantly at clinical concentrations.
Biochimica et Biophysica Acta (BBA) - Biomembranes ( IF 2.8 ) Pub Date : 2019-11-29 , DOI: 10.1016/j.bbamem.2019.183140
Jigesh Patel 1 , Ekram A Chowdhury 2 , Behnam Noorani 2 , Ulrich Bickel 2 , Juyang Huang 1
Affiliation  

There is an on-going debate whether anesthetic drugs, such as isoflurane, can cause meaningful structural changes in cell membranes at clinical concentrations. In this study, the effects of isoflurane on lipid membrane fluidity were investigated using fluorescence anisotropy and spectroscopy. In order to get a complete picture, four very different membrane systems (erythrocyte ghosts, a 5-lipid mixture that mimics brain endothelial cell membrane, POPC/Chol, and pure DPPC) were selected for the study. In all four systems, we found that fluorescence anisotropies of DPH-PC, nile-red, and TMA-DPH decrease significantly at the isoflurane concentrations of 1 mM and 5 mM. Furthermore, the excimer/monomer (E/M) ratio of dipyrene-PC jumps immediately after the addition of isoflurane. We found that isoflurane is quite effective to loosen up highly ordered lipid domains with saturated lipids. Interestingly, 1 mM isoflurane causes a larger decrease of nile-red fluorescence anisotropy in erythrocyte ghosts than 52.2 mM of ethanol, which is three times the legal limit of blood alcohol level. Our results paint a consistent picture that isoflurane at clinical concentrations causes significant and immediate increase of membrane fluidity in a wide range of membrane systems.

中文翻译:

在临床浓度下,异氟烷显着增加细胞膜的流动性。

麻醉药物(例如异氟烷)是否会在临床浓度下引起细胞膜的有意义的结构变化,目前仍在争论。在这项研究中,使用荧光各向异性和光谱法研究了异氟烷对脂质膜流动性的影响。为了获得完整的图片,选择了四个非常不同的膜系统(红细胞幻影,模拟脑内皮细胞膜的5-脂质混合物,POPC / Chol和纯DPPC)进行研究。在所有四个系统中,我们发现在异氟烷浓度为1 mM和5 mM时,DPH-PC,尼罗红和TMA-DPH的荧光各向异性显着降低。此外,在加入异氟烷后,二苯乙烯-PC的准分子/单体(E / M)比值立即增加。我们发现异氟烷非常有效地使具有饱和脂质的高度有序的脂质结构域松散。有趣的是,与52.2 mM的乙醇相比,1 mM的异氟烷引起的红细胞鬼影中的尼罗红荧光各向异性的降低更大,这是血液酒精水平的法定极限的三倍。我们的研究结果得出了一致的结论,即临床浓度的异氟烷会导致各种膜系统中膜流动性的显着立即增加。
更新日期:2019-11-30
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