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Ex vivo electroretinograms made easy: performing ERGs using 3D printed components.

Paul J Bonezzi1, Matthew J Tarchick1, Jordan M Renna1

  • 1Department of Biology, The University of Akron, OH, USA.

The Journal of Physiology
|September 4, 2020
PubMed
Summary

Researchers can now perform high-quality electroretinograms (ERGs) using a modified patch-clamp rig. This cost-effective method utilizes 3D printed parts for enhanced ex vivo retinal recordings and visual function studies.

Keywords:
3D printERGconeelectroretinogramex vivophotoreceptorretinarod

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Area of Science:

  • Neuroscience
  • Physiology
  • Biomedical Engineering

Background:

  • Rod and cone photoreceptors initiate visual processing by converting light into electrochemical signals.
  • Electroretinograms (ERGs) measure light-induced retinal activity, enabling physiological assessment of intact retinas.
  • Traditional ERG setups often require specialized, costly equipment.

Purpose of the Study:

  • To present a cost-effective method for reconfiguring a standard patch-clamp rig for ex vivo electroretinogram (ERG) recordings.
  • To demonstrate the utility of 3D printed components in enhancing ERG signal-to-noise ratio and versatility.
  • To provide researchers with an accessible tool for studying retinal function in isolated tissues.

Main Methods:

  • Modified a traditional patch-clamp rig by incorporating 3D printed components.
  • Adapted existing light pathways within the patch-clamp setup for ERG measurements.
  • Developed protocols for high signal-to-noise ex vivo ERG recordings from isolated retinas.

Main Results:

  • Achieved high signal-to-noise detection of ERG a-waves (300-600 µV) and b-waves (1-3 mV).
  • Demonstrated the capability to discern small photovoltages (1-2 µV) from background noise.
  • Successfully reconfigured a patch-clamp rig for economical and efficient ERG analysis.

Conclusions:

  • The described methodology offers an economical and efficient way to perform ex vivo ERGs using readily available equipment.
  • This approach enhances the study of neuronal populations in isolated retinal tissue, particularly for small or immature responses.
  • The interchangeable patch-clamp/ERG system provides a versatile tool for visual neuroscience research.