Autophagy, Apoptosis, and Cell Proliferation in Exstrophy-Epispadias Complex

Area of Science:

• Cell Biology
• Developmental Biology
• Urology

Background:

• Bladder exstrophy is a congenital condition requiring surgical closure.
• The impact of delayed closure on bladder smooth muscle cell (SMC) biology is not fully understood.
• Autophagy, apoptosis, and cell proliferation are key cellular processes influencing tissue development and repair.

Purpose of the Study:

• To investigate autophagy, apoptosis, and cell proliferation in bladder SMCs from patients with successful early or delayed bladder exstrophy closure.
• To compare these cellular processes with those in control patients with vesicoureteral reflux.

Main Methods:

• Primary bladder SMC cultures were established from three groups: successful neonatal closure (N=5), delayed closure due to small bladder template (N=5), and vesicoureteral reflux controls (N=5).
• Immunostaining was used to assess autophagy (LC3) and cell proliferation (Ki67).
• Apoptosis was evaluated using the terminal deoxynucleotidyl transferase-mediated dUTP digoxigenin nick-end labeling assay.

Main Results:

• Autophagy marker LC3 expression was significantly higher in the delayed closure group compared to neonatal closure and control groups.
• Apoptotic indices were markedly higher in SMCs from the delayed closure group.
• Cell proliferation marker Ki67 expression was significantly lower in the delayed closure group.

Conclusions:

• Delayed closure in bladder exstrophy is associated with an upregulated autophagic process, increased apoptosis, and decreased SMC proliferation.
• These findings suggest a potential role for autophagy modulation in managing bladder exstrophy.
• Targeting autophagy may represent a future therapeutic avenue for improving outcomes in bladder exstrophy patients.