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Anchoring fibrils form a complex network in human and rabbit cornea
I K Gipson1, S J Spurr-Michaud, A S Tisdale
1Eye Research Institute of Retina Foundation, Boston, MA 02114, USA.
Investigative Ophthalmology & Visual Science
|February 1, 1987
Summary
This study details the structure and distribution of type VII collagen anchoring fibrils in human and rabbit corneas. These fibrils form a complex network beneath the basal lamina, anchoring it to the corneal stroma.
Area of Science:
- Ophthalmology
- Connective Tissue Biology
- Corneal Ultrastructure
Background:
- Type VII collagen forms anchoring fibrils crucial for corneal basement membrane adhesion.
- Understanding anchoring fibril structure is vital for corneal health and disease research.
Purpose of the Study:
- To investigate the distribution, penetration depth, and histochemical localization of type VII collagen anchoring fibrils in human and rabbit corneas.
- To compare anchoring fibril morphology between human corneas (with Bowman's layer) and rabbit corneas (without Bowman's layer).
Main Methods:
- Electron microscopy of corneal cross-sections and tangential sections.
- Histochemical localization using monoclonal antibodies against type VII collagen.
Main Results:
- Anchoring fibrils insert into the basal lamina, splay laterally, and form a branching network below it.
- Fibrils anchor to extracellular matrix "anchoring plaques" distal to the basal lamina.
- Average penetration depth was 0.60 µm (human) and 0.54 µm (rabbit); type VII collagen localized to the basement membrane-anchoring fibril zone.
Conclusions:
- Anchoring fibrils exhibit a consistent network structure and penetration depth in both species.
- No significant structural or distributional differences were found between human and rabbit corneas.
- This provides a detailed ultrastructural map of the corneal basement membrane anchoring system.