首页> 外文会议>Biophotonics and New Therapy Frontiers; Progress in Biomedical Optics and Imaging; vol.7 no.35 >Microspectrofluorometry and Polarization Microscopy of Membrane Dynamics in Living Cells
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Microspectrofluorometry and Polarization Microscopy of Membrane Dynamics in Living Cells

机译:活细胞膜动力学的显微荧光光谱法和极化显微镜

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Membrane dynamics of human glioblastoma cells were investigated using the intercalating fluorescence marker 6-dodecanoyl-2-dimethylamino naphthalene (laurdan). In particular its generalized polarization (GP), which describes a spectral shift depending on the phase of membrane lipids, was used as a measure of membrane stiffness, whereas its fluorescence lifetime T and its rotational diffusion tune t_r were used to characterize membrane fluidity. Upon excitation with linearly polarized pulsed laser light the parallel and perpendicular components of fluorescence from the sample were measured simultaneously using an imaging device with polarization sensitivity. So far, membrane dynamics depended on temperature and cell age as well as the on intracellular amount of cholesterol. In addition, the plasma membrane (assessed by illumination with an evanescent electromagnetic wave) appeared to be stiffer than intracellular membranes (assessed by epiillumination of the cells).
机译:使用插入荧光标记6-十二烷酰基-2-二甲基氨基萘(劳丹),研究人胶质母细胞瘤细胞的膜动力学。特别地,其广义偏振(GP)描述了取决于膜脂质相的光谱偏移,被用作膜硬度的量度,而其荧光寿命T和旋转扩散调谐t_r用于表征膜的流动性。在使用线性偏振脉冲激光激发后,使用具有偏振灵敏度的成像设备同时测量样品中荧光的平行和垂直分量。到目前为止,膜动力学取决于温度和细胞年龄以及细胞内胆固醇的含量。另外,质膜(通过e逝电磁波的照射进行评估)似乎比细胞内膜(通过细胞的落射照射进行评估)更坚硬。

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