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Phorbol ester modulation of rabbit corneal endothelial permeability
1Department of Physiology and Biophysics, University of Tennessee, Memphis 38163, USA.
Investigative Ophthalmology & Visual Science
|December 31, 1997
Summary
Phorbol esters, like PMA, significantly harm corneal endothelial cells, causing swelling and permeability increases. These effects, mediated by protein kinase C, damage corneal structure and function.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Phorbol esters are known to significantly influence cellular activity.
- Corneal endothelial cells are crucial for maintaining corneal clarity and function.
Purpose of the Study:
- To investigate the impact of phorbol esters on the structure and function of corneal endothelial cells.
- To determine the dose-dependent effects of 4 beta-phorbol 12-myristate 13-acetate (PMA) on corneal endothelium.
Main Methods:
- Corneas were superfused with varying concentrations of 4 beta-phorbol 12-myristate 13-acetate (PMA) or 4-alpha-PMA.
- Corneal swelling and endothelial permeability were measured.
- Corneal endothelial cell morphology was examined using scanning and transmission electron microscopy.
Main Results:
- 100 nM and 1 microM PMA significantly increased corneal swelling and endothelial permeability compared to controls.
- 10 nM PMA did not significantly alter corneal swelling or permeability.
- PMA induced significant morphologic changes in corneal endothelial cells at all tested concentrations.
- 4-alpha-PMA showed less detrimental effects than 4 beta-PMA on corneal swelling and permeability.
Conclusions:
- Phorbol esters, particularly PMA, are detrimental to corneal endothelial cell function and structure.
- PMA induces corneal swelling, increased endothelial permeability, and cellular damage.
- The observed effects are likely mediated through a protein kinase C pathway.