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Interaction of DNA with Cationic Lipid Mixtures—Investigation at Langmuir Lipid Monolayers
Langmuir ( IF 3.7 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acs.langmuir.7b02014
Christopher Janich 1 , André Hädicke 2 , Udo Bakowsky 3 , Gerald Brezesinski 4 , Christian Wölk 1
Affiliation  

Four different binary lipid mixtures composed of a cationic lipid and the zwitterionic colipids DOPE or DPPC, which show different DNA transfer activities in cell culture models, were investigated at the soft air/water interface to identify transfection efficiency determining characteristics. Langmuir films are useful models to investigate the interaction between DNA and lipid mixtures in a two-dimensional model system by using different surface sensitive techniques, namely, epifluorescence microscopy and infrared reflection–absorption spectroscopy. Especially, the effect of adsorbed DNA on the properties of the lipid mixtures has been examined. Distinct differences between the lipid composites were found which are caused by the different colipids of the mixtures. DOPE containing lipid mixtures form fluid monolayers with a uniform distribution of the fluorescent probe in the presence and absence of DNA at physiologically relevant surface pressures. Only at high nonphysiological pressures, the lipid monolayer collapses and phase separation was observed if DNA was present in the subphase. In contrast, DPPC containing lipid mixtures show domains in the liquid condensed phase state in the presence and absence of DNA in the subphase. The adsorption of DNA at the positively charged mixed lipid monolayer induces phase separation which is expressed in the morphology and the point of appearance of these domains.

中文翻译:

DNA与阳离子脂质混合物的相互作用-Langmuir脂质单分子膜的研究

在软空气/水界面处研究了四种不同的由阳离子脂质和两性离子大肠杆菌DOPE或DPPC组成的二元脂质混合物,它们在细胞培养模型中显示了不同的DNA转移活性,以确定转染效率的确定特性。Langmuir胶片是有用的模型,可通过使用不同的表面敏感技术(即落射荧光显微镜和红外反射吸收光谱法)研究二维模型系统中DNA与脂质混合物之间的相互作用。特别地,已经研究了吸附的DNA对脂质混合物的性质的影响。发现脂质混合物之间存在明显的差异,这是由混合物的不同大肠杆菌引起的。含有DOPE的脂质混合物会在生理相关的表面压力下,在存在和不存在DNA的情况下,形成具有荧光探针均匀分布的流体单层。仅在高非生理压力下,如果亚相中存在DNA,脂质单分子层就会塌陷并观察到相分离。相反,在亚相中存在和不存在DNA的情况下,含DPPC的脂质混合物在液态浓缩相状态下显示域。DNA在带正电荷的混合脂质单层上的吸附诱导相分离,相分离以这些域的形态和出现点表示。如果亚相中存在DNA,则脂质单层塌陷并观察到相分离。相反,在亚相中存在和不存在DNA的情况下,含DPPC的脂质混合物在液态浓缩相状态下显示域。DNA在带正电荷的混合脂质单层上的吸附诱导相分离,相分离以这些域的形态和出现点表示。如果亚相中存在DNA,则脂质单层塌陷并观察到相分离。相反,在亚相中存在和不存在DNA的情况下,含DPPC的脂质混合物在液态浓缩相状态下显示域。DNA在带正电荷的混合脂质单层上的吸附诱导相分离,相分离以这些域的形态和出现点表示。
更新日期:2017-09-21
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