脂质单分子层与泊洛沙姆188之间的相互作用：X射线反射率和衍射研究
Interaction between lipid monolayers and poloxamer 188: an X-ray reflectivity and diffraction study.
作者信息
Wu Guohui, Majewski Jaroslaw, Ege Canay, Kjaer Kristian, Weygand Markus Jan, Lee Ka Yee C
机构信息
Department of Chemistry, the Institute for Biophysical Dynamics and the James Franck Institute, the University of Chicago, 5735 S. Ellis Avenue, Chicago, IL 60637, USA.
出版信息
Biophys J. 2005 Nov;89(5):3159-73. doi: 10.1529/biophysj.104.052290. Epub 2005 Aug 12.
Abstract
The mechanism by which poloxamer 188 (P188) seals a damaged cell membrane is examined using the lipid monolayer as a model system. X-ray reflectivity and grazing-incidence x-ray diffraction results show that at low nominal lipid density, P188, by physically occupying the available area and phase separating from the lipids, forces the lipid molecules to pack tightly and restore the barrier function of the membrane. Upon compression to bilayer equivalent pressure, P188 is squeezed out from the lipid monolayer, allowing a graceful exit of P188 when the membrane integrity is restored.
摘要
以脂质单层作为模型系统，研究了泊洛沙姆188（P188）封闭受损细胞膜的机制。X射线反射率和掠入射X射线衍射结果表明，在低标称脂质密度下，P188通过物理占据可用区域并与脂质发生相分离，迫使脂质分子紧密堆积，从而恢复膜的屏障功能。在压缩至双层等效压力时，P188从脂质单层中挤出，当膜完整性恢复时，P188能顺利排出。
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