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High resolution three-dimensional meshwork structure of the glomerular basement membrane.
1Third Department of Internal Medicine, Okayama University Medical School, Japan.
Nihon Jinzo Gakkai Shi
|April 1, 1992
Summary
The glomerular basement membrane (GBM) has a 3D meshwork structure composed of type IV collagen. This collagen meshwork, with 3-4 nm pores, acts as a crucial size barrier in the kidney glomerulus.
Area of Science:
- Nephrology
- Cell Biology
- Biochemistry
Background:
- The glomerular basement membrane (GBM) is vital for kidney filtration.
- Its precise ultrastructure and composition remain areas of active research.
Purpose of the Study:
- To elucidate the three-dimensional ultrastructure of the rat GBM.
- To identify the molecular components forming the GBM's meshwork.
Main Methods:
- Rat GBM was treated with sodium dodecyl sulfate and 2-mercaptoethanol.
- Ultrastructural analysis was performed using conventional and high-voltage transmission electron microscopy.
- Rotary shadowing was employed to visualize individual fibrils.
Main Results:
- A fine, three-dimensional meshwork structure was observed throughout the GBM.
- The meshwork consists of approximately 3 nm diameter fibrils with 3-4 nm pores.
- Rotary shadowing identified these fibrils as type IV collagen molecules.
Conclusions:
- The GBM possesses a homogeneous 3D meshwork structure composed primarily of type IV collagen.
- This collagenous meshwork likely functions as a size-selective barrier in glomerular filtration.