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In vitro biocompatibility evaluation of functional electrically stimulating microelectrodes on primary glia
Christopher T Tsui1,2,3,4, Soroush Mirkiani3,4, David A Roszko3,4
1Department of Biomedical Engineering, University of Alberta, Edmonton, AB, Canada.
Frontiers in Bioengineering and Biotechnology
|February 5, 2024
Summary
Investigating neural interface electrodes, this study reveals electrical stimulation directly impacts glial cells. Optimized in vitro models show varied cellular responses, paving the way for more biocompatible and longer-lasting neural implants.
Area of Science:
- Neuroscience
- Biomaterials Science
- Cell Biology
Background:
- Neural interfacing devices use microelectrodes to interact with the central nervous system.
- Inflammatory responses from glial cells to implants can impair device function.
- Improving implant biocompatibility is crucial for effective neural interfaces.
Purpose of the Study:
- To investigate the direct effects of electrical stimulation on glial cells at the electrode interface.
- To develop and optimize a high-throughput in vitro system for assessing glial cell responses to electrical stimulation.
- To explore methods for enhancing the biocompatibility and longevity of neural electrodes.
Main Methods:
- Developed a high-throughput in vitro system using primary glial cell cultures from CX3CR-1+/EGFP mice.
- Applied biphasic electrical stimulation waveforms (0 mA, 0.15 mA, 1.5 mA) via platinum-iridium microelectrodes for 3 days.
- Assessed glial cell responses using biomarker immunofluorescence (Hoescht, EGFP, GFAP, IL-1β) and scanning electron microscopy for electrode damage.
Main Results:
- Electrical stimulation at different currents induced localized responses in glial cells, varying by biomarker.
- Fluorescence and electron microscopy analyses demonstrated differential cellular reactions to stimulation.
- The study identified specific cellular responses to electrical stimulation parameters, expanding on in vivo findings.
Conclusions:
- The developed in vitro system effectively models glial cell responses to electrical stimulation from neural electrodes.
- Varied electrical stimulation parameters elicit distinct localized glial cell responses.
- This research provides a new avenue for improving the biocompatibility and longevity of neural interfacing devices.
