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Updated: Oct 27, 2025
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Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium
Published on: July 14, 2020
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K+-dependent Müller cell-generated components of the electroretinogram.
Andrey V Dmitriev1, Alexander A Dmitriev1, Robert A Linsenmeier1,2,3
1Department of Biomedical Engineering, Northwestern University, Evanston, Illinois.
Visual Neuroscience
|July 23, 2021
Summary
Glial Müller cells (MCs) contribute to the slow PIII component of the electroretinogram (ERG). However, MCs do not significantly impact the ERG
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- The electroretinogram (ERG) is crucial for assessing retinal function and pathology.
- Glial Müller cells (MCs) are known to generate transretinal potentials in response to light-induced changes in extracellular potassium ([K+]o).
- MCs contribute to the slow PIII (sPIII) component of the ERG and may influence the b-wave.
Purpose of the Study:
- To investigate the contribution of Müller cells (MCs) to the electroretinogram (ERG) b-wave.
- To analyze light-evoked extracellular potassium ([K+]o) changes in the mouse retina using an electrical model of MCs.
Main Methods:
- Detailed measurements of light-evoked extracellular potassium ([K+]o) changes in isolated mouse retinas.
- Analysis using a linear electrical model of Müller cells (MCs).
Main Results:
- Müller cells (MCs) generate the cornea-negative sPIII component of the ERG.
- The cornea-positive potential generated by MCs is too small to significantly influence the ERG b-wave.
- The study explains the origin of the sPIII component and the lack of substantial MC contribution to cornea-positive potentials.
Conclusions:
- Müller cells (MCs) are significant generators of the slow PIII (sPIII) component of the ERG.
- MCs do not substantially contribute to the ERG b-wave.
- Understanding glial cell contributions refines ERG interpretation for retinal function and disease.
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