Closed Bipolar Electrode Array for On-Chip Analysis of Cellular Respiration by Cell Aggregates

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Cell Biology

Background:

• Cell aggregates are crucial for tissue engineering and drug screening.
• Noninvasive, high-throughput tools are needed to assess cellular respiration in aggregates.
• Conventional electrode arrays face limitations in miniaturization and wiring complexity for high-throughput applications.

Purpose of the Study:

• To develop a novel bipolar electrode (BPE) array for on-chip, high-throughput detection of cellular respiration in individual cell aggregates.
• To overcome the limitations of conventional electrode systems in terms of wiring complexity and miniaturization.
• To demonstrate the feasibility of using BPEs for analyzing cellular activity in a simplified, wirelessly controlled system.

Main Methods:

• Fabrication of a closed BPE device with analytical and reporter chambers to separate ECL chemicals from cell aggregates.
• Utilizing a BPE array where oxygen concentration at cathodic poles is converted to electrochemiluminescence (ECL) signals at anodic poles.
• Wireless control of 32 BPEs using a pair of driving electrodes for simultaneous analysis.

Main Results:

• Successfully detected respiratory activities of individual MCF-7 cell aggregates using the BPE array.
• Demonstrated simple wiring with multiple BPEs functioning under a single power supply.
• Achieved on-chip analysis of cellular activity, marking a first for BPE systems in this context.

Conclusions:

• The developed BPE array offers a simplified, high-throughput solution for analyzing cellular respiration in cell aggregates.
• This technology has significant potential for applications in tissue engineering and drug screening.
• The wireless control and simplified wiring represent a significant advancement in on-chip cellular analysis systems.