抗癌药物他莫昔芬和4 -羟他莫昔芬对磷脂酰乙醇胺脂质多态性的影响

IF 3.4 3区 生物学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY
Julia Ortiz, José A. Teruel, Francisco J. Aranda, Antonio Ortiz
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引用次数: 1

摘要

采用生物物理方法研究了他莫昔芬(TMX)及其代谢物4-羟基他莫昔芬(HTMX)与1,2-二烯酰磷脂酰乙醇胺(DEPE)组成的仿生膜模型系统的相互作用。TMX掺入到DEPE双分子层中导致Lβ/Lα相变逐渐变宽,温度向下移动。l - β/ l - α相变呈现多重恒温,表明TMX/DEPE结构域在双分子层平面内存在侧向偏析。TMX和HTMX也使Lα向六边形-HII的转变变宽并向更低的值移动,相图显示两种化合物都促进了HII相的形成。TMX增加了Lβ、Lα和HII期DEPE酰基链的情绪障碍,而HTMX的作用明显不同。此外,TMX和HTMX均未显著干扰DEPE极性头基区的水化状态。分子动力学(MD)模拟表明,这些药物不影响膜厚度,每脂质面积,或DEPE分子的构象。作为一般规则,html与DEPE的交互在性质上类似于TMX,但强度较小。然而,MD显示的一个显著差异是,HTMX主要位于每层膜的中心周围,而TMX主要位于膜的中心,也有更大的簇形成倾向。讨论这些结果是为了了解这些药物对磷脂酰乙醇胺脂质多态性的调节,这可能与解释它们对酶活性或膜透性的影响有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Anticancer drugs tamoxifen and 4hydroxytamoxifen as effectors of phosphatidylethanolamine lipid polymorphism

The interaction of tamoxifen (TMX) and its metabolite 4-hydroxytamoxifen (HTMX) with a biomimetic membrane model system composed of 1,2-dielaidoylphosphatidylethanolamine (DEPE) has been studied using a biophysical approach. Incorporation of TMX into DEPE bilayers gives rise to a progressive broadening of the Lβ/Lα phase transition and a downward temperature shift. The Lβ/Lα phase transition presents multiple endotherms, indicating a lateral segregation of TMX/DEPE domains within the plane of the bilayer. TMX and HTMX also widen and shift the Lα to hexagonal-HII transition toward lower values, the phase diagrams showing that both compounds facilitate formation of the HII phase. TMX increases motional disorder of DEPE acyl chains in the Lβ, Lα and HII phases, whereas the effect of HTMX is clearly different. In addition, neither TMX nor HTMX significantly perturb the hydration state of the polar headgroup region of DEPE. Molecular dynamics (MD) simulations indicate that these drugs do not affect membrane thickness, area per lipid, or the conformation of DEPE molecules. As a general rule, the interaction of HTMX with DEPE is qualitatively similar to TMX but less intense. However, a significant difference shown by MD is that HTMX is mainly placed around the center of each monolayer while TMX is located mainly at the center of the membrane, also having a greater tendency to cluster formation. These results are discussed to understand the modulation of phosphatidylethanolamine lipid polymorphism carried out by these drugs, which could be of relevance to explain their effects on enzyme activity or membrane permeabilization.

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来源期刊
Chemistry and Physics of Lipids
Chemistry and Physics of Lipids 生物-生化与分子生物学
CiteScore
7.60
自引率
2.90%
发文量
50
审稿时长
40 days
期刊介绍: Chemistry and Physics of Lipids publishes research papers and review articles on chemical and physical aspects of lipids with primary emphasis on the relationship of these properties to biological functions and to biomedical applications. Accordingly, the journal covers: advances in synthetic and analytical lipid methodology; mass-spectrometry of lipids; chemical and physical characterisation of isolated structures; thermodynamics, phase behaviour, topology and dynamics of lipid assemblies; physicochemical studies into lipid-lipid and lipid-protein interactions in lipoproteins and in natural and model membranes; movement of lipids within, across and between membranes; intracellular lipid transfer; structure-function relationships and the nature of lipid-derived second messengers; chemical, physical and functional alterations of lipids induced by free radicals; enzymatic and non-enzymatic mechanisms of lipid peroxidation in cells, tissues, biofluids; oxidative lipidomics; and the role of lipids in the regulation of membrane-dependent biological processes.
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