The gene uroplakin-3a (UPK3A) is mapped to human chromosome 22q. It is a transmembrane protein and is present at the apical membrane of superficial umbrella cells of urothelium.
Synonyms: Anti-UP3; Anti-UPIII; Anti-Uroplakin III; Anti-Uroplakin-3A
Storage: -20C
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Biochem Physiol Actions: Uroplakin-3a (UPK3A) forms heterodimer with another member of the same family, UPK1B. Absence of UPK3A in mouse model causes abnormal targeting of UPK1B. In addition, absence of UPK3A in urothelium causes formation of small plaques, leakiness and results in hydronephrosis. UPK3A is involved in uropathogenic Escherichia coli invasion. It interacts with the bacterial type-1 pilus adhesion, FimH, and undergoes phosphorylation with subsequent elevation of intracellular calcium. These signaling events are crucial for bacterial invasion and urothelial apoptosis. UPK3A is associated with urothelial carcinoma, carcinoma metastatic to the bladder. UPK3A is up-regulated in vesicoureteral reflux, a common congenital urinary tract anomaly.
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