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Three-dimensional ultrastructure of human glomerular basement membrane by a quick-freezing and deep-etching method
1Department of Internal Medicine, Kitasato University School of Medicine, Japan.
Nephron
|January 1, 1995
Summary
The human glomerular basement membrane (GBM) features a unique three-layered ultrastructure with meshwork and perpendicular fibrils. These structures are similar to animal GBM and likely function as essential size and charge barriers.
Area of Science:
- Nephrology
- Cell Biology
- Biophysics
Background:
- The glomerular basement membrane (GBM) is crucial for kidney filtration.
- Understanding its three-dimensional ultrastructure is key to comprehending its barrier function.
Purpose of the Study:
- To elucidate the three-dimensional ultrastructure of the human GBM.
- To correlate observed ultrastructures with known GBM layers (lamina densa, laminae rarae).
Main Methods:
- Utilized quick-freezing and deep-etching for high-resolution imaging.
- Examined surgically resected human kidney tissue.
Main Results:
- Identified a middle layer with polygonal meshwork structures composed of fine fibrils.
- Observed outer and inner layers formed by perpendicular fibrils connecting cells to the meshwork.
- These findings correspond to lamina densa and laminae rarae observed in conventional sections.
Conclusions:
- Human GBM shares meshwork and perpendicular fibril structures with animal GBM.
- These ultrastructures are proposed to function as critical size and charge barriers in kidney filtration.