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Sulfated proteoglycans in the human lamina cribrosa
S Sawaguchi1, B Y Yue, T Fukuchi
1Department of Ophthalmology, University of Illinois, Chicago College of Medicine 60612.
Investigative Ophthalmology & Visual Science
|July 1, 1992
Summary
Researchers identified chondroitin/dermatan sulfate and heparan sulfate proteoglycans in the human lamina cribrosa. This finding provides crucial ultrastructural information for understanding glaucoma and related diseases.
Area of Science:
- Ophthalmology
- Biochemistry
- Cell Biology
Background:
- The lamina cribrosa is a crucial optic nerve structure.
- Proteoglycans play vital roles in tissue structure and disease.
- Understanding proteoglycan distribution in the lamina cribrosa is essential for glaucoma research.
Purpose of the Study:
- To investigate the ultrastructural distribution and morphology of sulfated proteoglycans in the normal human lamina cribrosa.
- To identify the types of proteoglycans present and their association with extracellular matrix components.
Main Methods:
- Electron microscopy was employed to visualize proteoglycans.
- Cuprolinic blue dye was used to specifically bind and stain sulfated proteoglycans.
- Enzymatic digestion (chondroitinase AC, B, ABC, heparinase, keratanase) was performed to characterize proteoglycan types.
Main Results:
- Three types of chondroitin/dermatan sulfate proteoglycans were identified within the laminar plate cores, associated with collagen fibers.
- Heparan sulfate proteoglycans were found associated with the basal laminae of astrocytes and blood vessels.
- Keratanase showed no effect on any observed proteoglycan structures.
Conclusions:
- This study elucidates the ultrastructural localization of distinct proteoglycan species in the human lamina cribrosa.
- The findings establish a baseline for future research into the role of proteoglycans in ocular diseases like glaucoma.