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FAT is a component of glomerular slit diaphragms
T Inoue1, E Yaoita, H Kurihara
1Department of Renal Pathology, Institute of Nephrology, Faculty of Medicine, Niigata University, Niigata, Japan.
Kidney International
|March 7, 2001
Summary
FAT, a novel cadherin superfamily member, is identified as a key component of kidney podocyte slit diaphragms. This finding advances our understanding of glomerular structure and function.
Area of Science:
- Nephrology
- Molecular Biology
- Cell Biology
Background:
- Slit diaphragms are crucial intercellular junctions in kidney podocytes.
- Their precise molecular composition remains largely unknown.
- Cadherin superfamily members are known components of similar cell junctions.
Purpose of the Study:
- To investigate the potential role of cadherin superfamily members in slit diaphragm structure.
- To isolate and characterize novel slit diaphragm components.
Main Methods:
- Homology polymerase chain reaction (PCR) was used to isolate FAT cDNA from rat glomeruli.
- Ribonuclease protection assay and in situ hybridization confirmed FAT mRNA expression in podocytes.
- Immunohistochemistry and immunogold labeling localized FAT protein within the glomerulus.
Main Results:
- FAT mRNA and protein were detected in rat kidney glomeruli, specifically in podocytes.
- FAT protein localized to cell-cell contact sites in cultured kidney cells and along glomerular capillary walls.
- FAT colocalized with known slit diaphragm markers (mAb 5-1-6) and ZO-1 at the slit diaphragm base.
Conclusions:
- FAT is a novel component of the podocyte slit diaphragm.
- Its molecular structure and localization support its role in glomerular filtration barrier integrity.