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Updated: Jul 16, 2026
Isolation of Primary Mouse Retinal Glial Müller Cells
Published on: August 30, 2024
Porcine Müller glial cells increase expression of BKCa channels in retinal detachment
Andreas Bringmann1, Ianors Iandiev, Thomas Pannicke
1Department of Ophthalmology and Eye Clinic, Faculty of Medicine, University of Leipzig, Liebigstrasse 10-14, D-04103 Leipzig, Germany. bria@medizin.uni-leipzig.de
Purpose:
To determine whether experimental retinal detachment causes an alteration in Ca2 +-activated, big conductance K+ (BK) currents of Müller glial cells.
Methods:
Rhegmatogenous retinal detachment was induced in porcine eyes. Müller cells were acutely isolated from control retinas and from retinas that were detached for 7 days. BK currents were detected by using the BK channel opener and the blocker phloretin and tetraethylammonium, respectively.
Results:
In addition to cellular hypertrophy and a decrease in inward rectifier K+ currents, Müller cells from detached retinas showed an increase in the amplitude of currents mediated by BK channels (850 +/- 105 pA) when compared with cells from control retinas (228 +/- 60 pA; p < 0.001). Similarly, the density of the BK channel-mediated currents was greater in cells from detached retinas (12.32 +/- 1.52 pA/pF) compared with control cells (4.07 +/- 1.07 pA/pF; p < 0.001). The increase in BK currents was correlated with the decrease of the inward rectifier K+ currents.
Conclusions:
It is suggested that an increase in the expression of functional BK channels may be involved in gliotic responses of Müller cells after retinal detachment (e.g., in mitogen-induced Ca2+ responses and cellular proliferation).
Insights
Experimental retinal detachment increases calcium-activated big conductance potassium (BK) currents in Müller glial cells. This finding suggests a role for BK channels in the gliotic response following retinal detachment.
Area of Science:
- Ophthalmology
- Neuroscience
- Cell Biology
Background:
- Müller glial cells are crucial for retinal structure and function.
- Retinal detachment triggers cellular responses, including gliosis.
- Alterations in ion channel activity are implicated in glial cell responses.
Purpose of the Study:
- To investigate the impact of experimental retinal detachment on calcium-activated big conductance potassium (BK) currents in Müller glial cells.
- To determine if BK channel activity is altered following rhegmatogenous retinal detachment.
Main Methods:
- Rhegmatogenous retinal detachment was surgically induced in porcine eyes.
- Müller cells were isolated from control and detached retinas (7 days post-detachment).
- BK currents were measured using specific channel openers and blockers.
Main Results:
- Müller cells from detached retinas exhibited significantly increased BK current amplitude (850 pA vs. 228 pA) and density (12.32 pA/pF vs. 4.07 pA/pF) compared to controls.
- A decrease in inward rectifier K+ currents was observed concurrently with increased BK currents.
- Cellular hypertrophy was also noted in Müller cells from detached retinas.
Conclusions:
- Experimental retinal detachment leads to a significant upregulation of functional BK channels in Müller glial cells.
- Increased BK channel expression may contribute to Müller cell gliotic responses, potentially influencing calcium signaling and proliferation.
- These findings highlight the role of ion channel modulation in the glial response to retinal injury.
