Application of fluorescence polarization microscopy to measure fluorophore orientation in the outer hair cell plasma membrane.
Application of fluorescence polarization microscopy to measure fluorophore orientation in the outer hair cell plasma membrane.
复制标题
应用荧光偏振显微镜测量外毛细胞质膜中的荧光团方向。
DOI:
10.1117/1.2717499
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发表时间:
2007
影响因子:
3.5
通讯作者:
Raphael,RobertM
中科院分区:
文献类型:
--
作者:
Greeson,JenniferN;Raphael,RobertM
The biophysical properties and organization of cell membranes regulate many membrane-based processes, including electromotility in outer hair cells (OHCs) of the cochlea. Studies of the membrane environment can be carried out by measuring the orientation of membrane-bound fluorophores using fluorescence polarization microscopy (FPM). Due to the cylindrical shape of OHCs, existing FPM theory developed for spherical cells is not applicable. We develop a new method for analyzing FPM data suitable for the quasi-cylindrical OHC. We present the theory for this model, as well as a study of the orientation of the fluorescent probe pyridinium, 4-[2-[6-(dioctylamino)-2-naphthalenyl]ethenyl]-1-(3-sulfopropyl) (di-8-ANEPPS) in the OHC membrane. Our results indicate that the absorption transition dipole moment of di-8-ANEPPS orients symmetrically about the membrane normal atwith respect to the plane of the membrane. The observed agreement between theoretical predictions and experimental measurements establishes the applicability of FPM to study OHC plasma membrane properties.
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