Nano Science and Technology Institute
Nanotech 2010 Vol. 3
Nanotech 2010 Vol. 3
Nanotechnology 2010: Bio Sensors, Instruments, Medical, Environment and Energy
Chapter 1: Bio Sensors, Diagnostics & Imaging

On-Chip Ion-selective Microesensor for Evaluation of Mitochondrial Membrane Potential

Authors:T.-S. Lim, A. Dávila, D.C. Wallace, P. Burke
Affilation:UC Irvine, US
Pages:118 - 121
Keywords:microsensor, mitochondria, lab-on-a-chip, ion-selective electrode
Abstract:The mitochondrial membrane potential is used to generate and regulate energy in living systems, driving the conversion of ADP to ATP, and controlling apoptosis, all central to human health and disease. Therefore, there is a need for tools to study its regulation in a controlled environment for potential clinical and scientific applications. For this aim, an on-chip tetraphenylphosphonium (TPP+) selective microelectrode sensor was constructed in a microfluidic environment. The concentration of isolated mitochondria (Heb7A) used in a membrane potential measurement was 0.3 ng/uL, four orders of magnitude smaller than the concentration used in conventional assays (3 ug/uL). In addition, the volume of the chamber (85 uL) is 2 orders of magnitude smaller than traditional experiments. As a demonstration, changes in the membrane potential are clearly measured in response to substrates and inhibitors of the electron transport chain. This approach, which to date has not been demonstrated for study of mitochondrial function and bio-energetics in generally, can be instrumental advance in the field of mitochondrial research and clinical applications by allowing high throughput studies of the regulation, dynamics, and statistical properties of the mitochondrial membrane potential in response to inhibitors and inducers of apoptosis in a controlled microfluidic environment.
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