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Updated: Aug 30, 2026
Isolation of Primary Mouse Retinal Glial Müller Cells
Published on: August 30, 2024
Selective staining by vital dyes of Müller glial cells in retinal wholemounts
Ortrud Uckermann1, Ianors Iandiev, Mike Francke
1Paul Flechsig Institute of Brain Research, Department of Neurophysiology, University of Leipzig, Leipzig, Germany.
Abstract:
Müller glial cells within the retina may respond to different signaling molecules with an elevation of their intracellular free calcium. To prove the localization of the recorded calcium responses in Müller cells within acutely isolated retinal wholemounts, retinal pieces from adult animals and humans were exposed to different vital dyes just after the calcium imaging records were finished. The dyes, Mitotracker Orange, Mitotracker Green, Celltracker Orange, Celltracker Green, and monochlorobimane, are all selectively taken up by Müller glial cells, while neuronal cells remain largely devoid of the dyes. By using this method, it can be demonstrated that the free calcium alterations within the wholemounts indeed occur within Müller cells. Moreover, the cross-sectional areas of (dye-filled) Müller glial cell bodies, as well as of (dye-free) neuronal cell bodies, can be measured in retinal wholemounts, and the spatial densities of both types of cells can be determined. The vital dye loading of Müller cells may facilitate investigations of stimulus-induced alterations of retinal glial cell physiology and morphology.
Insights
This study confirms that calcium signals in retinal wholemounts originate from Müller glial cells. Vital dyes were used to identify Müller glial cells, enabling precise localization of calcium responses and cell measurements.
Area of Science:
- Neuroscience
- Cell Biology
- Ophthalmology
Background:
- Müller glial cells are crucial retinal support cells.
- Intracellular calcium (Ca2+) elevation is a key cellular response.
- Localizing calcium signals in specific retinal cells is essential for understanding visual processing.
Purpose of the Study:
- To confirm that calcium responses recorded in retinal wholemounts are localized within Müller glial cells.
- To establish a method for identifying Müller glial cells post-calcium imaging.
Main Methods:
- Calcium imaging was performed on acutely isolated retinal wholemounts.
- Vital dyes (Mitotracker, Celltracker, monochlorobimane) were applied post-imaging to selectively label Müller glial cells.
- Microscopy was used to visualize dye-filled Müller cells and dye-free neuronal cells.
Main Results:
- Vital dyes confirmed that recorded calcium elevations occurred specifically within Müller glial cells.
- The method allowed for measurement of Müller glial cell and neuronal cell body dimensions.
- Spatial densities of Müller glial and neuronal cells were determined.
Conclusions:
- The vital dye labeling technique reliably identifies Müller glial cells in retinal wholemounts after calcium imaging.
- This method facilitates the study of Müller glial cell physiology and morphology in response to stimuli.
- Accurate localization of calcium signaling in Müller cells advances retinal research.
