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Scanning and transmission electron microscopy of Müller cells isolated from rabbit retina
Abstract:
Proteolytic enzymes were applied in the dissociation of rabbit retina to obtain isolated Müller cells. Both trypsin and papain were used, and in some cases the trypsinization was shortly interrupted by tissue fixation before it was continued. Scanning electron microscopy mostly confirmed the previous descriptions of these cells, which were based on different techniques. In addition, some new cell extensions were observed that derived from the nuclear region. The papain procedure ensured the best cell preservation with a free surface and limited contaminant material attached. Roughly 90% of the cells excluded trypan blue. It is concluded that these cells should be preferred for biochemical studies, because their cytology also turned out to be intact as judged from electron microscopic sections.
Insights
Researchers isolated rabbit Müller cells using proteolytic enzymes like trypsin and papain. Papain yielded the best cell preservation, making these isolated Müller cells ideal for biochemical studies due to their intact cytology.
Area of Science:
- Ophthalmology
- Cell Biology
- Neuroscience
Background:
- Müller cells are crucial glial cells in the vertebrate retina.
- Previous methods for isolating Müller cells have limitations in cell preservation and purity.
Purpose of the Study:
- To optimize the isolation of intact Müller cells from rabbit retina.
- To evaluate different proteolytic enzymes for Müller cell dissociation.
- To assess the suitability of isolated Müller cells for biochemical analysis.
Main Methods:
- Dissociation of rabbit retina using proteolytic enzymes (trypsin and papain).
- Interruption of trypsinization with tissue fixation in some cases.
- Scanning electron microscopy (SEM) for cell morphology assessment.
- Trypan blue exclusion assay for cell viability.
Main Results:
- Both trypsin and papain effectively dissociated retinal tissue.
- Papain treatment resulted in superior cell preservation, with a clean surface and minimal attached debris.
- SEM confirmed known Müller cell features and revealed novel cell extensions from the nuclear region.
- Approximately 90% of isolated cells excluded trypan blue, indicating high viability.
- Electron microscopic sections showed intact cytology in the isolated cells.
Conclusions:
- Papain is the preferred enzyme for isolating rabbit Müller cells with optimal preservation.
- Isolated Müller cells exhibit intact cytology, making them suitable for biochemical studies.
- The optimized isolation method provides a valuable tool for retinal research.