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Updated: Jun 14, 2026
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Microfluidics-Assisted Selective Depolarization of Axonal Mitochondria
Published on: August 4, 2022
Assessment of mitochondrial membrane potential using an on-chip microelectrode in a microfluidic device
Tae-Sun Lim1, Antonio Dávila, Douglas C Wallace
1Integrated Nanosystems Research Facility, Department of Electrical Engineering & Computer Science, University of California Irvine, Irvine, CA 92697-3940, USA.
Lab on a Chip
|April 13, 2010
Summary
Researchers developed a novel microfluidic sensor to measure mitochondrial membrane potential using significantly fewer mitochondria and sample volumes. This innovation enables high-throughput studies of mitochondrial bioenergetics and apoptosis regulation for clinical applications.
Area of Science:
- Biomedical Engineering
- Cellular Biology
- Bioenergetics
Background:
- Mitochondrial membrane potential is crucial for cellular energy production, ion homeostasis, and apoptosis.
- Current methods for studying mitochondrial membrane potential are resource-intensive and lack throughput.
- There is a need for advanced tools to analyze mitochondrial function in controlled environments for research and clinical applications.
Purpose of the Study:
- To develop and validate an on-chip microfluidic sensor for precise measurement of mitochondrial membrane potential.
- To enable high-throughput analysis of mitochondrial bioenergetics and apoptosis regulation.
- To reduce sample volume and reagent consumption in mitochondrial studies.
Main Methods:
- Construction of an on-chip tetraphenylphosphonium (TPP(+)) selective microelectrode sensor within a microfluidic device.
- Measurement of mitochondrial membrane potential using isolated Heb7A mitochondria at significantly reduced concentrations (0.3 ng microL(-1)) and chamber volumes (85 microL).
- Demonstration of sensor's capability by measuring mitochondrial membrane potential changes in response to electron transport chain substrates and inhibitors.
Main Results:
- The microfluidic sensor successfully measured mitochondrial membrane potential with high sensitivity.
- The system utilized four orders of magnitude less mitochondria and two orders of magnitude smaller chamber volumes compared to conventional assays.
- Clear detection of mitochondrial membrane potential alterations induced by various substrates and inhibitors was achieved.
Conclusions:
- The developed microfluidic sensor represents a novel and efficient platform for studying mitochondrial membrane potential.
- This approach facilitates high-throughput, statistically robust analysis of mitochondrial function, dynamics, and apoptosis.
- The technology holds significant potential for advancing mitochondrial research and clinical applications.
