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arXiv 1807.00726cond-mat.soft
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表面电荷在纳米颗粒与模型肺表面活性剂相互作用中的作用

The role of surface charge in the interaction of nanoparticles with model pulmonary surfactants

F. Mousseau, J. -F. Berret

摘要:

吸入的纳米颗粒通过气道能够到达肺部的呼吸区。在这种情况下,进入的颗粒首先与肺泡上皮细胞衬里的液体(肺表面活性剂)接触。肺表面活性物质由脂质和蛋白质组成,它们组装成大的囊泡结构。与肺表面活性剂的生物化学相互作用的性质的问题是理解纳米颗粒如何穿过空气-血液屏障的核心。在这里,我们探讨了在受控条件下,100纳米以下的颗粒和表面活性剂替代品的相行为。三种类型的表面活性剂模拟物,包括外源性替代品Curosurf,一种用于患有呼吸窘迫综合征的婴儿的药物,与氧化铝(Al 2 O3),二氧化硅(SiO2)和聚合物(乳胶)纳米颗粒一起进行测试。本文的主要结果是观察到库仑引力诱导的纳米粒子-囊泡自发聚集。表面电荷的作用已明确确定。我们还评估了最近预测的支持脂质双层形成,并发现在研究的情况下,这些结构不会发生。关于聚集体的内部结构,荧光显微镜证实囊泡和颗粒在纳米到微米尺度上相互混合。由于颗粒充当囊泡之间的粘附物,预计肺泡空间中吸入纳米材料的存在可能会显著改变肺表面活性剂的界面和体积性质,并干扰肺生理学。

英文摘要:

Inhaled nanoparticles traveling through the airways are able to reach the respiratory zone of the lungs. In such event, the incoming particles first enter in contact with the liquid lining the alveolar epithelium, the pulmonary surfactant. The pulmonary surfactant is composed of lipids and proteins that are assembled into large vesicular structures. The question of the nature of the biophysicochemical interaction with the pulmonary surfactant is central to understand how the nanoparticles can cross the air-blood barrier. Here we explore the phase behavior of sub-100 nm particles and surfactant substitutes in controlled conditions. Three types of surfactant mimetics, including the exogenous substitute Curosurf, a drug administred to infants with respiratory distress syndrome are tested together with aluminum oxide (Al2O3), silicon dioxide (SiO2) and polymer (latex) nanoparticles. The main result here is the observation of the spontaneous nanoparticle-vesicle aggregation induced by Coulombic attraction. The role of the surface charges is clearly established. We also evaluate the supported lipid bilayer formation recently predicted and find that in the cases studied these structures do not occur. Pertaining to the aggregate internal structure, fluorescence microscopy ascertains that the vesicles and particles are intermixed at the nano- to microscale. With particles acting as stickers between vesicles, it is anticipated that the presence of inhaled nanomaterials in the alveolar spaces could significantly modify the interfacial and bulk properties of the pulmonary surfactant and interfere with the lung physiology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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