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Uroplakins in the lower urinary tract.
1Department of Urology, Dankook University College of Medicine, Cheonan, Korea.
International Neurourology Journal
|April 7, 2011
Summary
Uroplakins (UPs) form essential urinary barrier plaques. UP II deficiency prevents plaque formation, leading to ureter blockages, while UP III deficiency impairs barrier function and causes reflux.
Area of Science:
- Urothelial biology
- Membrane protein assembly
- Epithelial barrier function
Background:
- Mammalian urinary epithelium apical surface features scallop-shaped membrane plaques.
- These plaques comprise four uroplakins (UPs), integral membrane proteins of the tetraspanin superfamily.
- UPs form an exceptional barrier against water and urine toxins.
Purpose of the Study:
- To review recent studies on uroplakins (UPs).
- To explain the clinical significance of laboratory findings regarding UPs.
- To elucidate the role of UPs in urothelial differentiation and barrier function.
Main Methods:
- Analysis of uroplakin (UP) organization and assembly pathways.
- Investigation of UP knockout (KO) mouse models (UP II, UP IIIa).
- Assessment of urothelial plaque formation, barrier function, and associated pathologies in KO mice.
Main Results:
- UPs assemble into heterodimers (UP Ia/UP II, UP Ib/UP III) and heterotetramers, forming 16-nm particles.
- UP II knockout completely abolishes uroplakin plaque formation, causing ureter polyps or occlusion.
- UP IIIa knockout impairs urothelial permeability barrier, causes vesicoureteral reflux, and reduces plaque size.
Conclusions:
- Uroplakins (UPs) are critical for urothelial differentiation and the formation of a functional permeability barrier.
- UP II is essential for uroplakin plaque assembly, while UP IIIa is crucial for barrier integrity and plaque size.
- Dysfunction in UPs leads to significant urinary tract pathologies, highlighting their clinical importance.
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