In vivo replacement of damaged bladder urothelium by Wolffian duct epithelial cells

Figures and data relating to the PNAS 2018 paper titled "In vivo replacement of damaged bladder urothelium by Wolffian duct epithelial cells" by Vezina et al. Paper abstract: The bladders remarkable regenerative capacity had been thought to derive exclusively from its own progenitors. While examining consequences of DNA methyltransferase 1 (Dnmt1) inactivation in mouse embryonic bladder epithelium, we made the surprising discovery that Wolffian duct epithelial cells can support bladder regeneration. Conditional Dnmt1 inactivation in mouse urethral and bladder epithelium triggers widespread apoptosis, depletes basal and intermediate bladder cells and disrupts Uroplakin protein expression. These events coincide with Wolffian duct epithelial cell recruitment into Dnmt1 mutant urethra and bladder where they are reprogrammed to express bladder markers including FOXA1, Keratin 5, P63 and Uroplakin. This is the first evidence that Wolffian duct epithelial cells are summoned in vivo to replace damaged bladder epithelium and function as a reservoir of cells for bladder regeneration.