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Signalling molecules involved in mouse bladder smooth muscle cellular differentiation.

Benchun Liu1, Dongxiao Feng, Guiting Lin

  • 1Department of Urology, University of California, San Francisco, San Francisco, CA, USA.

The International Journal of Developmental Biology
|December 17, 2009
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Mouse bladder smooth muscle development involves differential gene expression. Sonic hedgehog (Shh) signaling from urothelium influences mesenchyme differentiation, with distinct gene profiles observed based on proximity and developmental stage.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Urology

Background:

  • Mouse bladder smooth muscle differentiates from mesenchyme.
  • Urothelium-derived Sonic hedgehog (Shh) is a key inducer.
  • Gene expression patterns in bladder mesenchyme are not fully understood.

Purpose of the Study:

  • To investigate differential gene expression in mouse bladder mesenchyme.
  • To correlate gene expression with proximity to urothelium and smooth muscle differentiation.
  • To understand the role of Shh signaling in bladder development.

Main Methods:

  • Collection of embryonic mouse bladders at various gestational ages (E12.5-E16).
  • Laser capture microdissection of bladder mesenchyme layers.
  • SYBR Green quantitative RT-PCR for mRNA expression profiling.

Main Results:

  • Smooth muscle markers (SMAA, SM-MHC) found in peripheral mesenchyme from E13.5 onwards.
  • Shh pathway genes (Ptc1, Gli1) and Bmp4 elevated near urothelium at E12.5.
  • TGF-beta1 and SRF showed distinct spatial and temporal expression patterns.

Conclusions:

  • Genes downstream of Shh are differentially expressed in bladder mesenchyme.
  • Expression patterns correlate with gestational age and smooth muscle differentiation.
  • Proximity to urothelium influences mesenchymal gene expression during bladder development.