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Dye coupling of rabbit ciliary epithelial cells in vitro
1Department of Ophthalmology, Northwestern University Medical School, Chicago, Illinois 60611.
Investigative Ophthalmology & Visual Science
|April 1, 1994
Summary
Rabbit ciliary epithelium exhibits functional gap junctions between its cell layers. High extracellular calcium or acidity disrupts this cell-cell coupling, impacting tissue function.
Area of Science:
- Ophthalmology
- Cell Biology
- Physiology
Background:
- Gap junctions facilitate intercellular communication and are crucial for tissue function.
- The ciliary epithelium plays a vital role in aqueous humor dynamics and ocular physiology.
Purpose of the Study:
- To investigate the in vitro characteristics of gap junctions within the isolated rabbit ciliary epithelium.
- To determine the influence of specific environmental factors on cell-cell coupling in this tissue.
Main Methods:
- Intracellular potential measurements and iontophoretic injection of lucifer yellow dye into ciliary epithelial cells.
- Examination of dye distribution using laser confocal microscopy on fixed tissue samples.
Main Results:
- Lucifer yellow dye spread confirmed horizontal and vertical connectivity between ciliary epithelial cells, indicating functional gap junctions.
- Dye reflux was not observed at the microinjection site.
- High extracellular calcium (10 mM) or acidic pH (6.3) abolished cell-cell dye coupling.
Conclusions:
- Laser confocal microscopy confirmed the physiological presence of gap junctions connecting both layers of the rabbit ciliary epithelium.
- Extracellular acidosis and elevated calcium concentrations lead to a loss of cell-cell coupling in the rabbit ciliary epithelium.