Abstract
Silicon nanomembranes are ultrathin, highly permeable, optically transparent and biocompatible substrates for the construction of barrier tissue models. Trans-epithelial/endothelial electrical resistance (TEER) is often used as a non-invasive, sensitive and quantitative technique to assess barrier function. The current study characterizes the electrical behavior of devices featuring silicon nanomembranes to facilitate their application in TEER studies. In conventional practice with commercial systems, raw resistance values are multiplied by the area of the membrane supporting cell growth to normalize TEER measurements. We demonstrate that under most circumstances, this multiplication does not ‘normalize’ TEER values as is assumed, and that the assumption is worse if applied to nanomembrane chips with a limited active area. To compare the TEER values from nanomembrane devices to those obtained from conventional polymer track-etched (TE) membranes, we develop finite element models (FEM) of the electrical behavior of the two membrane systems. Using FEM and parallel cell-culture experiments on both types of membranes, we successfully model the evolution of resistance values during the growth of endothelial monolayers. Further, by exploring the relationship between the models we develop a ‘correction’ function, which when applied to nanomembrane TEER, maps to experiments on conventional TE membranes. In summary, our work advances the the utility of silicon nanomembranes as substrates for barrier tissue models by developing an interpretation of TEER values compatible with conventional systems.
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Acknowledgements
Authors would like to thank Dr. Henry Chung, Zachery Hulings and Tucker Bergin for their help in COMSOL modeling, and Thomas Andolsek in obtaining the TEER data for validation experiments. They also acknowledge the support of Dr. Allison Elder (Department of Environmental Medicine, University of Rochester) during the early days of this project. This work was supported by funding from the National Institutes of Health under program project grant number: 5 R01 HL125265.
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Funds supporting this research were provided by the US Public Health Service under NIH grant number 5R01 HL125265
Tejas S. Khire and Barrett J. Nehilla contributed equally to this paper
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Khire, T.S., Nehilla, B.J., Getpreecharsawas, J. et al. Finite element modeling to analyze TEER values across silicon nanomembranes. Biomed Microdevices 20, 11 (2018). https://doi.org/10.1007/s10544-017-0251-7
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DOI: https://doi.org/10.1007/s10544-017-0251-7