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Bioelectronic Sensors for Tissue/Organ-on-a-Chip Systems

Summary

The use of tissue/organ-on-a-chip systems is limited to endpoint and destructive measurements. Integration of electronic elements in these systems have proven to be a huge challenge and only a few demonstrations have been shown. Contrary to endpoint biochemical methods, continuous electronic monitoring of cellular behavior provides an approach for real-time and non-destructive methods that support acute and chronic studies within the same assay. Therefore, we are developing microfluidic-based tissue/organ-on-a-chip devices with embedded electronic elements. We aim to measure cell migration rate, which we hypothesize can be correlated with aggressiveness of cancer cells, and cardiac cell beating changes, which can indicate progression of cell function failure, such as during myocardial infarction. Electronic elements in our systems are directly fabricated on porous membranes that serve as adhesion surfaces where cultured cells are interrogated in a controlled microenvironment. Impedance and action (field) potentials can be measured continuously to provide real-time information of the physiological state of the cell. Our goal is to fabricate systems and demonstrate their efficacy in delivering real-time, continuous monitoring of cellular responses under stress and disease conditions. The end goal is to provide an in vitro measurement system to determine cellular responses toward therapeutic molecules.

Description

Microfluidic tissue/organ on a chip system

Figure 1.  Microfluidic tissue/organ on a chip system with embedded electrodes (yellow) on both sides of the porous membrane (blue).  Liver cancer cells (red) and endothelial cells (green) can be trapped while flowing through the channels (white) on each side of the membrane to form a tissue-type cell co-culture.  The two cell types are trapped using dielectrophoresis. They are physically separated by the membrane but can interact and communicate with each other through secreted cell signals via the pores in the membrane.

We apply our expertise in micro/nanofabrication, electrokinetics and cell-based assays to develop bioelectronic sensors in microfluidic platforms. We are working on a platform that entraps cells for electrochemical monitoring in an environment that has mechanical properties more similar to those experienced by the cells in vivo. We will employ impedance measurements to determine cell migration characteristics of cancer cells in a 3D model system, and bioelectric activity of cardiac cells under induced stress conditions. Current efforts in our lab have produced a platform with electrodes on a porous membrane for dielectrophoretic trapping as well as impedance measurements of cell migration. Development of these organ-on-a-chip devices with embedded electronic capabilities will provide tools to help develop regenerative medicine approaches and cell-based diagnostics for heart disease and cancer.

Created February 3, 2020, Updated February 5, 2020