第31卷第4 期
报
学
CaJ
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物
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JoL 31 No. 4
2014 年 8 月 JO UR N A L OF ATO M IC AND M OLEC ULA R PH Y SIC S Aug. 2014
do i: 103969/j. issn. 1000-0364. 2014. 04. 030
多组分磷脂巨囊泡的相结构和胆固醇对
微畴成长的影响
杨方源\ 哈丽旦• 居马汗2 ,蒋中英3
( I . 新疆大学物理科学与技术学院,乌鲁木齐830046; 2 . 伊犁师范学院化学与生物科学学院,伊宁835000;
3 . 伊犁师范学院电子与信息工程学院,伊宁835000)
摘 要 :巨囊泡作为细胞的简化模型,其相分离与出芽动力学规律已引起许多领域科学家的关注.本实验
采用D P P C /D O P C /C h ol的三组分形成的巨囊泡作为模型,借助荧光显微镜观察该三组分体系侧向分离的
相结构图,并对微畴的成长过程作了系统的观察研究和理论分析. 实验发现:从高温的均相区域淬灭到低
温的分相区域,膜表面发生侧向分离形成微畴.体系内胆固醇的掺入量的多少会影响磷脂膜的相结构和膜
内微畴的成长,固定D O P C /D PP C 为 1 :1 的前提下,微畴尺寸随着胆固醇掺入量的增加而变大.
关键词:巨囊泡;微畴;侧向分离;相结构
中图分类号:0484 文献标识码:A 文章编号:1000-0364(2014)04-0677-06
Phase structure of multicomponent phospholipid giant unilamellar
vesicles and the influence of cholesterol on domain growth
YANG Fang-Yuang1,JUM AH AN Halydan2,JIANG Zhong-Ying3
(I. School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China;
2. College of Chemistry and Biological Sciences, Yili Normal University, Yining 835000,China;
3. School of Electronic and Information Engineering, Yili Normal University, Yining 835000,China)
Abstract: G ia n t Unilamellar V e s ic le s (GUVs) as a simplified model of c e ll ,its k in e tic s of p h a s e separa
tion and budding have attracted many scientists attention. In this paper, the typical membrane system
which consisted of DOPC/DPPC/Chol was used, the experiment studies and theoretically analyzes the
growth process of domains by observing the structure diagram of its lateral separation with the help of
fluorescence microscopy. It showed that: domains were forming through lateral separation on the sur
face of membrane from the homogeneous region at high temperature quenching to the heterogeneous re
gion at low temperature. Different component of Cholesterol would influence the phase structure of
phospholipids,membrane and the growth of domains within the membrane,with varying cholesterol
composition against a fixed I : I ratio of DOPC/DPPC, the domain radius increasing with the cholesterol
composition.
Key w ords: Giant Unilamellar Vesicles(GUVs) ; Domain; Lateral separation; Phase structure
收稿日期:2013-11-28
基金项目:基金项目:国家自然科学基金(21264016)
作者简介:杨方源(1988—),女,硕士生,研究方向为生物膜/ 纳米材料复合材料的再组织.
通讯作者:蒋中英,E-mail:jiangzhying@163. com