Label-Free Imaging of Membrane Potential Using Membrane Electromotility
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Author(s)
Oh, Seungeun
Fang-Yen, Chris
Choi, Wonshik
Yaqoob, Zahid
Fu, Dan
Park, YongKeun
Dassari, Ramachandra R.
Feld, Michael S.
Date Issued
July 2012
Journal
Biophysical Journal
Publisher
Elsevier
Citation
Oh, Seungeun, Christopher Fang-Yen, Wonshik Choi, Zahid Yaqoob, Dan Fu, YongKeun Park, Ramachandra R. Dassari, and Michael S. Feld. “Label-Free Imaging of Membrane Potential Using Membrane Electromotility.” Biophysical Journal 103, no. 1 (July 2012): 11–18. © 2012 Biophysical Society
Version
Final published version
Abstract
Electrical activity may cause observable changes in a cell's structure in the absence of exogenous reporter molecules. In this work, we report a low-coherence interferometric microscopy technique that can detect an optical signal correlated with the membrane potential changes in individual mammalian cells without exogenous labels. By measuring milliradian-scale phase shifts in the transmitted light, we can detect changes in the cells' membrane potential. We find that the observed optical signals are due to membrane electromotility, which causes the cells to deform in response to the membrane potential changes. We demonstrate wide-field imaging of the propagation of electrical stimuli in gap-junction-coupled cell networks. Membrane electromotility-induced cell deformation may be useful as a reporter of electrical activity.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Spectroscopy Laboratory
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1016/j.bpj.2012.05.020
