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Bladder exstrophy (BEX) epithelial cells can form a barrier in vitro, but squamous BEX cells show impaired barrier function. This suggests developmental programming issues in BEX, impacting epithelial phenotype and treatment strategies.

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Area of Science:

  • Urology
  • Developmental Biology
  • Epithelial Biology

Background:

  • Bladder exstrophy (BEX) is a rare congenital condition where the bladder is exposed externally.
  • Histological analysis of BEX epithelia often reveals persistent squamous and proliferative changes post-surgery.
  • The in vitro barrier-forming capacity of BEX-derived epithelial cells is not well understood.

Purpose of the Study:

  • To investigate the in vitro barrier-forming potential of epithelial cells derived from bladder exstrophy (BEX) patients.
  • To correlate histological subtypes of BEX epithelia (transitional vs. squamous) with their in vitro barrier function.
  • To explore the underlying transcriptional mechanisms associated with impaired barrier formation in squamous BEX epithelia.

Main Methods:

  • Epithelial cells were isolated from 11 patient-derived BEX samples (6 transitional, 5 squamous).
  • Cells were cultured in vitro under conditions promoting differentiated tight barrier formation.
  • Transepithelial electrical resistance (TEER) was measured to assess barrier integrity.
  • Gene expression analysis (KRT14, PPARG, GATA3, FOXA1) was performed.

Main Results:

  • 8 out of 11 BEX cell lines successfully formed tight barriers (>1000 Ω.cm²).
  • Three squamous BEX lines failed to develop significant transepithelial electrical resistance.
  • An inverse correlation was observed between KRT14 transcript expression and barrier development.
  • Squamous BEX cultures exhibited reduced expression of urothelial differentiation markers (PPARG, GATA3, FOXA1).

Conclusions:

  • Patient-derived bladder exstrophy (BEX) epithelial cells can generate barrier-forming epithelia in vitro.
  • Squamous BEX epithelia demonstrate impaired barrier formation, linked to altered transcriptional programming.
  • These findings suggest that developmental interruptions influence the spectrum of BEX epithelial phenotypes and may inform clinical management and reconstructive strategies.