Passive Recording of Bioelectrical Signals from Non-Excitable Cells by Fluorescent Mirroring.

Area of Science:

• Biophysics
• Cell Biology
• Bioelectrical Signaling

Background:

• Cellular electrical variations influence critical biological processes like migration, mitosis, and mutation.
• Current methods for monitoring these bioelectrical signals are invasive, requiring direct cellular or intracellular access.
• Dynamic monitoring is crucial for advancements in diagnostics and drug testing.

Purpose of the Study:

• To develop a novel, non-invasive technique for passively recording electrical signals from non-excitable cells.
• To overcome the limitations of existing invasive monitoring technologies.
• To enable new avenues for cell-based diagnostics and drug efficacy evaluation.

Main Methods:

• Utilized 3D microelectrodes for cell adhesion.
• Employed an optical mirroring approach for passive signal recording.
• Measured fluorescence intensity changes in the presence of HEK-293 cells.

Main Results:

• Demonstrated a 5.8% increase in fluorescence intensity with HEK-293 cells on electrodes compared to bare electrodes.
• Successfully evaluated cell-substrate adhesion and monitored cell proliferation.
• Established a proof-of-concept for passive bioelectrical signal detection.

Conclusions:

• The novel optical mirroring technique offers a non-invasive alternative for monitoring cellular electrical activity.
• Current applications include assessing cell adhesion and proliferation.
• Future refinements may enable quantitative analysis of surface charges and resting potentials for studying cell migration and cancer progression.