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Inflammatory Expression Profiles in Bladder Exstrophy Smooth Muscle: Normalization Over Time.

Jason E Michaud1, Haowen Qiu2, Heather N DiCarlo3

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Urology
|March 15, 2023
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Summary

Bladder exstrophy smooth muscle cells (SMC) show gene expression changes related to inflammation and development, which normalize after surgical closure. These findings suggest SMC gene expression alterations contribute to bladder exstrophy abnormalities, with potential for normalization over time.

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Area of Science:

  • Urology
  • Developmental Biology
  • Genetics

Background:

  • Bladder exstrophy (BE) is a complex congenital condition affecting bladder development.
  • Phenotypic abnormalities in BE are hypothesized to stem from altered detrusor smooth muscle cell (SMC) gene expression.

Purpose of the Study:

  • To investigate gene expression profiles in SMC from patients with bladder exstrophy.
  • To determine if gene expression changes in BE SMC normalize after surgical intervention.

Main Methods:

  • Primary human bladder SMC lines were generated from patients with classic bladder exstrophy (CBE) and controls.
  • RNA sequencing was performed to create gene expression profiles.
  • Gene Set Enrichment Analysis (GSEA) was used to characterize expression patterns.

Main Results:

  • 308 differentially expressed genes were identified in BE SMC compared to controls.
  • Increased expression of inflammatory response genes and altered genitourinary development genes were observed in early-stage BE SMC.
  • These gene expression changes were absent in SMC from older patients who had undergone surgical closure.

Conclusions:

  • BE SMC exhibit distinct gene expression profiles related to inflammation and genitourinary development.
  • SMC gene expression appears to normalize over time following surgical closure of the bladder.
  • These findings suggest that while SMC gene expression alterations contribute to BE, surgical repair may facilitate cellular normalization.