Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves
Measurement of cell surface coverage has become a common technique for the assessment of growth behavior of cells. As an indirect measurement method, this can be accomplished by monitoring changes in electrode impedance, which constitutes the basis of electric cell-substrate impedance sensing (ECIS)...
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doaj-baea623bad2b42b0bfb1e3fedcaa99ff2021-08-26T14:18:30ZengMDPI AGSensors1424-82202021-08-01215286528610.3390/s21165286Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth CurvesAnna Ronja Dorothea Binder0Andrej-Nikolai Spiess1Michael W. Pfaffl2Animal Physiology & Immunology, School of Life Sciences Weihenstephan, Technical University of Munich, Weihenstephaner Berg 3, D-85354 Freising, GermanyCenter for Cardiology, Genomics and System Biology, UKE, D-20246 Hamburg, GermanyAnimal Physiology & Immunology, School of Life Sciences Weihenstephan, Technical University of Munich, Weihenstephaner Berg 3, D-85354 Freising, GermanyMeasurement of cell surface coverage has become a common technique for the assessment of growth behavior of cells. As an indirect measurement method, this can be accomplished by monitoring changes in electrode impedance, which constitutes the basis of electric cell-substrate impedance sensing (ECIS). ECIS typically yields growth curves where impedance is plotted against time, and changes in single cell growth behavior or cell proliferation can be displayed without significantly impacting cell physiology. To provide better comparability of ECIS curves in different experimental settings, we developed a large toolset of R scripts for their transformation and quantification. They allow importing growth curves generated by ECIS systems, edit, transform, graph and analyze them while delivering quantitative data extracted from reference points on the curve. Quantification is implemented through three different curve fit algorithms (smoothing spline, logistic model, segmented regression). From the obtained models, curve reference points such as the first derivative maximum, segmentation knots and area under the curve are then extracted. The scripts were tested for general applicability in real-life cell culture experiments on partly anonymized cell lines, a calibration setup with a cell dilution series of impedance versus seeded cell number and finally IPEC-J2 cells treated with 1% and 5% ethanol.https://www.mdpi.com/1424-8220/21/16/5286ECIS (impedance vs. time)IPEC-J2 (adherent cells)segmented regressionfour-parameter logisticsmoothing splinearea under the curve (AUC) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anna Ronja Dorothea Binder Andrej-Nikolai Spiess Michael W. Pfaffl |
spellingShingle |
Anna Ronja Dorothea Binder Andrej-Nikolai Spiess Michael W. Pfaffl Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves Sensors ECIS (impedance vs. time) IPEC-J2 (adherent cells) segmented regression four-parameter logistic smoothing spline area under the curve (AUC) |
author_facet |
Anna Ronja Dorothea Binder Andrej-Nikolai Spiess Michael W. Pfaffl |
author_sort |
Anna Ronja Dorothea Binder |
title |
Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves |
title_short |
Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves |
title_full |
Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves |
title_fullStr |
Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves |
title_full_unstemmed |
Modelling and Differential Quantification of Electric Cell-Substrate Impedance Sensing Growth Curves |
title_sort |
modelling and differential quantification of electric cell-substrate impedance sensing growth curves |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2021-08-01 |
description |
Measurement of cell surface coverage has become a common technique for the assessment of growth behavior of cells. As an indirect measurement method, this can be accomplished by monitoring changes in electrode impedance, which constitutes the basis of electric cell-substrate impedance sensing (ECIS). ECIS typically yields growth curves where impedance is plotted against time, and changes in single cell growth behavior or cell proliferation can be displayed without significantly impacting cell physiology. To provide better comparability of ECIS curves in different experimental settings, we developed a large toolset of R scripts for their transformation and quantification. They allow importing growth curves generated by ECIS systems, edit, transform, graph and analyze them while delivering quantitative data extracted from reference points on the curve. Quantification is implemented through three different curve fit algorithms (smoothing spline, logistic model, segmented regression). From the obtained models, curve reference points such as the first derivative maximum, segmentation knots and area under the curve are then extracted. The scripts were tested for general applicability in real-life cell culture experiments on partly anonymized cell lines, a calibration setup with a cell dilution series of impedance versus seeded cell number and finally IPEC-J2 cells treated with 1% and 5% ethanol. |
topic |
ECIS (impedance vs. time) IPEC-J2 (adherent cells) segmented regression four-parameter logistic smoothing spline area under the curve (AUC) |
url |
https://www.mdpi.com/1424-8220/21/16/5286 |
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