Detection of mitochondrial bioenergetics using a novel bimodal 3D microelectrode array (MEA)-based biosensor.

Area of Science:

• Biomedical Engineering
• Cellular Biology
• Bioenergetics

Background:

• Mitochondria are crucial organelles involved in ATP production, redox signaling, and cell death regulation.
• Mitochondrial dysfunction is an early biomarker for diseases like cancer, diabetes, and neurodegeneration.
• Electrophysiological processes in the inner and outer mitochondrial membranes are key indicators of cellular energy status.

Purpose of the Study:

• To develop a novel label-free biosensor for simultaneous measurement of mitochondrial electrophysiology.
• To enable bimodal sensing of both inner and outer mitochondrial membranes.
• To advance functional assays for drug discovery and understanding complex diseases.

Main Methods:

• Utilized a novel microfabrication strategy for 3D Microelectrode Arrays (MEAs).
• Employed electrochemical impedance spectroscopy (EIS) for impedance characterization.
• Performed time-resolved electrophysiology recordings for voltage transient analysis.

Main Results:

• Demonstrated a 3D mitochondria biosensor capable of bimodal sensing (OMM and IMM).
• EIS data characterized mitochondrial respiration and electron transport chain activity via conductive and capacitive properties of the IMM.
• Electrophysiology recordings captured sub-millisecond voltage transients related to VDAC gating or IMM potential dynamics.

Conclusions:

• The 3D mitochondria biosensor offers a new paradigm for label-free functional assays.
• Bimodal sensing provides comprehensive insights into mitochondrial electrophysiology.
• This technology can advance bioenergetic studies and disease biomarker research.