Electrode stimulation parameter modifications elicit differential glial cell responses in vitro over a short 4-h...

Area of Science:

• Neuroscience
• Biomaterials Science
• Cell Biology

Background:

• Designing biocompatible neural interfaces requires understanding glial cell responses to electrical stimulation.
• Previous studies noted glial cell reactions and void formation around electrodes.

Purpose of the Study:

• Develop a cell culture model to observe real-time glial cell responses to electrode stimulation.
• Investigate the impact of varying electrical stimulation parameters on glial cell fate and electrode interface.

Main Methods:

• Utilized live-imaging of EGFP-positive microglia and mixed glial cultures exposed to electrical stimulation.
• Varied stimulation amplitude, waveform, and frequency, analyzing cell density, fluorescence, and area coverage.
• Performed scanning electron microscopy, energy-dispersive x-ray spectroscopy, and electrochemical testing.

Main Results:

• Observed necrotic microglial cell death around stimulating electrodes within 4 hours.
• Demonstrated that stimulation parameters differentially affected glial cell biomarker signals.
• Electrode surfaces showed no significant damage or compositional changes; however, glial cells influenced electrode electrochemical performance.

Conclusions:

• Electrical stimulation parameters critically influence glial cell survival at the electrode-cell interface.
• Findings provide essential data for refining stimulation paradigms in electrical neuromodulation.
• The developed model aids in assessing biocompatibility for neural interfacing devices.