Oxidative Stress and Calcium Dysfunction in Glaucoma Cells
Author Information
Author(s): McElnea E.M., Quill B., Docherty N.G., Irnaten M., Siah W.F., Clark A.F., O’Brien C.J., Wallace D.M.
Primary Institution: Institute of Ophthalmology, Mater Misericordiae University Hospital, Dublin, Ireland
Hypothesis
Conditions of oxidative stress, mitochondrial dysfunction, and dysregulation of calcium homeostasis could contribute to the pathological changes seen in the lamina cribrosa of glaucoma patients.
Conclusion
The study finds evidence of oxidative stress, mitochondrial dysfunction, and impaired calcium extrusion in glaucomatous cells compared to normal cells.
Supporting Evidence
- GLC cells showed significantly higher ROS production compared with NLC cells (27.19±7.05 µM MDA versus 14.59±0.82 µM MDA, p<0.05).
- Expression of anti-oxidants was significantly lower in GLC compared to NLC (p=0.02).
- Mitochondrial membrane potential was lower in GLC (57.5±6.8%) compared to NLC (41.8±5.3%).
- Intracellular calcium levels were found to be higher in GLC cells compared to NLC (p<0.001).
Takeaway
This study shows that glaucoma cells have more stress and problems with energy and calcium than normal cells, which might help explain why glaucoma happens.
Methodology
The study used assays to measure reactive oxygen species, mitochondrial membrane potential, and calcium levels in lamina cribrosa cells from normal and glaucomatous donors.
Participant Demographics
5 normal donors (mean age 77.8 years) and 4 glaucomatous donors (mean age 81.0 years).
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
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