MICROMOTION OF MAMMALIAN-CELLS MEASURED ELECTRICALLY

被引:677
作者
GIAEVER, I
KEESE, CR
机构
关键词
CELL MOTILITY; FIBROBLAST BEHAVIOR; NANOMETER MOTIONS; ELECTRICAL MEASUREMENTS;
D O I
10.1073/pnas.88.17.7896
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Motility is a fundamental property of mammalian cells that normally is observed in tissue culture by time lapse microscopy where resolution is limited by the wavelength of light. This paper examines a powerful electrical technique by which cell motion is quantitatively measured at the nanometer level. In this method, the cells are cultured on small evaporated gold electrodes carrying weak ac currents. A large change in the measured electrical impedance of the electrodes is observed when cells attach and spread on these electrodes. When the impedance is tracked as a function of time, fluctuations are observed that are a direct measure of cell motion. Surprisingly, these fluctuations continue even when the cell layer becomes confluent. By comparing the measured impedance with a theoretical model, it is clear that under these circumstances the average motions of the cell layer of 1 nm can be inferred from the measurements. We refer to this aspect of cell motility as micromotion.
引用
收藏
页码:7896 / 7900
页数:5
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