Detachable glass microelectrodes for recording action potentials in active moving organs

Area of Science:

• Neuroscience
• Biomedical Engineering
• Physiology

Background:

• Traditional cellular action potential measurements often require tissue immobilization, which can compromise physiological relevance.
• Existing methods struggle to record electrical activity in actively moving organs without mechanical constraint or pharmacological intervention.

Purpose of the Study:

• To develop and validate novel detachable glass micropipette electrode devices for targeted action potential recordings in moving organs.
• To enable long-term, high-resolution electrical measurements in unconstrained biological tissues.

Main Methods:

• Development of 100-µg detachable glass microelectrodes with specialized designs for cardiac and neural tissues.
• Intracellular insertion and subsequent release of microdevices within target organs (heart and brain).
• Long-term monitoring of action potentials in unconstrained, physiologically active tissues.

Main Results:

• Detachable microdevices successfully recorded action potentials in moving cardiac myocytes and hippocampal neurons.
• Continuous, beat-to-beat monitoring of action potential duration was achieved during ischemia-reperfusion in unconstrained hearts.
• Stable base potentials and long-term recordings were obtained from neurons in vivo.

Conclusions:

• Detachable microdevices offer a robust solution for recording cellular electrical activity in moving organs.
• This technology overcomes the need for tissue immobilization, enhancing the physiological relevance of measurements.
• The microdevices provide high temporal resolution and cellular localization for studying dynamic biological processes.