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Updated: Mar 1, 2026
Isolation of Primary Mouse Retinal Glial Müller Cells
Published on: August 30, 2024
Postnatal development of radial glial (Müller) cells of the rabbit retina
Abstract:
Radial glial (Müller) cells were isolated from postnatal rabbit retinae by enzymatic dissociation in papain-containing solution, air-dried, and submitted to Pappenheim's panoptic stain. Morphometric data of these cells were evaluated by light microscopy. During postnatal development, the cells become substantially thicker and shorter, their nuclei lose the rod shape and move more toward scleral layers, and the nucleus-cytoplasm volume relation decreases. Whereas the cell volume increases from birth on, substantial outgrowth of fine side branches within the plexiform layers fails to occur before electrical activity is established there, i.e. after postnatal day 9. A model is proposed relating the growth of sheath-bearing glial processes to local protein synthesis stimulated by external K+ accumulation due to neuronal activity. Early myelinated nerve fibers are suggested to bear mechanical resistance to growing radial glial processes thus causing a splitting of these processes when they enter developing nerve fiber layers.
Insights
Müller cells in rabbit retina develop thicker, shorter structures and delayed branching postnatally. Their growth is linked to neuronal activity and protein synthesis, influenced by nerve fiber mechanical resistance.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Radial glial (Müller) cells are crucial for retinal development and function.
- Understanding Müller cell morphology changes during postnatal development is key to comprehending retinal maturation.
Purpose of the Study:
- To investigate the morphological changes of rabbit retinal Müller cells during postnatal development.
- To correlate Müller cell development with the establishment of retinal electrical activity and neuronal structures.
Main Methods:
- Isolation of Müller cells from postnatal rabbit retinae using enzymatic dissociation.
- Pappenheim's panoptic staining for cell visualization.
- Light microscopy for morphometric analysis of cell thickness, length, nuclear shape, and position.
Main Results:
- Müller cells significantly thicken and shorten postnatally.
- Nuclei change shape and migrate towards scleral layers; nucleus-cytoplasm ratio decreases.
- Branch outgrowth into plexiform layers is delayed until after postnatal day 9, coinciding with electrical activity onset.
Conclusions:
- Müller cell process growth, including sheath-bearing extensions, is proposed to be regulated by local protein synthesis stimulated by extracellular K+ accumulation from neuronal activity.
- Developing myelinated nerve fibers may mechanically impede radial glial processes, leading to their splitting within nerve fiber layers.
