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Calcium distribution in the human eye lens
1Department of Morphology, The Netherlands Ophthalmic Research Institute, Amsterdam, The Netherlands.
Ophthalmic Research
|January 1, 1996
Summary
Calcium distribution in the human eye lens varies by cell type. This variation in calcium storage, particularly in intermediate fibers, may explain the location of early lens opacities.
Area of Science:
- Ophthalmology
- Cell Biology
- Biochemistry
Background:
- Calcium plays a critical role in cellular functions within the human eye lens.
- Understanding calcium distribution is essential for comprehending lens physiology and pathology.
Purpose of the Study:
- To investigate the specific distribution and binding sites of calcium within different regions of the human eye lens.
- To correlate calcium localization patterns with the development of early lens opacities.
Main Methods:
- Utilized the oxalate-pyroantimonate technique for visualizing calcium deposits.
- Examined calcium distribution in epithelial cells, superficial cortical fibers, and intermediate fibers of the human lens.
Main Results:
- In epithelial cells and superficial fibers, calcium is sequestered in organelles like the endoplasmic reticulum, nuclear envelope, Golgi, and mitochondria.
- In intermediate fibers, liberated calcium binds ionically to phospholipids and potentially to beta-crystallin.
- A site-specific variation in calcium storage was observed throughout the lens.
Conclusions:
- The distinct calcium distribution patterns in the human eye lens suggest a role in maintaining lens transparency.
- The observed calcium storage mechanisms may explain the localization of early focal dot opacities and retrodots in deeper cortical regions.