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Updated: Aug 26, 2026
Isolation and Culture of Primary Retinal Müller Cells from Sprague-Dawley (SD) Rats
Published on: June 17, 2025
Electrophysiological properties of retinal Müller glial cells from myelin mutant rat
Andrés E Chávez1, Thomas Pannicke, Manuel Roncagliolo
1Department of Physiology, Faculty of Science, Neuroscience Center of Valparaiso, University of Valparaíso, Valparaíso, Chile.
Abstract:
The structural and functional similarities between Müller cells and oligodendrocytes prompted the present study of the electrophysiological properties of Müller (glia) cells obtained from the retinae of control and myelin mutant taiep rats during the postnatal developmental period (P12-P180). The whole-cell configuration of the patch-clamp technique was used to characterize the general properties and the K+ currents from dissociated Müller cells. During the first 3 weeks of life, a decrease of the membrane resistance and an increase of the membrane potential were observed in Müller cells from both control and taiep rats. However, Müller cells from taiep rats never achieved the very negative membrane potential (-50 mV vs -80 mV) and the low membrane resistance characteristic for control cells. Furthermore, Müller cells displayed increased inward and outward K+ currents during postnatal development up to P30/60 in controls; however, in taiep rats, this increase ceased at P20/30, and low-amplitude currents persisted into adulthood. These results provide first evidence of physiological changes in retinal Müller cells as a consequence of a myelin mutation causing a progressive deterioration of the central nervous system (CNS) due to a disturbance of the microtubule network of oligodendrocytes. We hypothesize that the progressive dysmyelination process of the optic nerve, accompanied by functional deficits of retinal neurons (e.g., ganglion cells), induces physiological alterations of Müller cells.
Insights
Myelin mutations in rats alter retinal Müller cells, impacting their electrical properties and potassium currents. These changes suggest a link between central nervous system myelin defects and retinal glial cell function.
Area of Science:
- Neuroscience
- Glial Cell Biology
- Retinal Physiology
Background:
- Müller cells in the retina share similarities with oligodendrocytes, the myelin-producing cells of the central nervous system (CNS).
- Mutations affecting myelin, such as in the taiep rat model, cause progressive CNS deterioration.
- Understanding glial cell responses to myelin defects is crucial for neurodegenerative disease research.
Purpose of the Study:
- To investigate the electrophysiological properties of retinal Müller cells in control and myelin mutant (taiep) rats during postnatal development.
- To determine if myelin mutations induce functional alterations in Müller cells.
- To explore the relationship between CNS dysmyelination and retinal glial cell physiology.
Main Methods:
- Whole-cell patch-clamp technique applied to dissociated Müller cells from taiep and control rats.
- Characterization of general membrane properties (resistance, potential) and potassium (K+) currents.
- Analysis across a postnatal developmental period (P12-P180).
Main Results:
- Müller cells in both groups showed decreased membrane resistance and increased membrane potential during early development.
- Müller cells from taiep rats exhibited less negative membrane potentials and higher resistance compared to controls.
- Potassium currents in taiep Müller cells showed blunted development and persisted at low amplitudes into adulthood, unlike controls.
Conclusions:
- This study provides the first evidence of physiological changes in retinal Müller cells due to a myelin mutation.
- The observed alterations in Müller cells are likely a consequence of the progressive dysmyelination and associated CNS pathology.
- Functional deficits in retinal neurons, secondary to optic nerve dysmyelination, may induce these Müller cell physiological alterations.
