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Related Experiment Videos

Sonic hedgehog regulates prostatic growth and epithelial differentiation.

Sarah H Freestone1, Paul Marker, O Cathal Grace

  • 1MRC Human Reproductive Sciences Unit, Centre for Reproductive Biology, The University of Edinburgh Chancellor's Building, 49 Little France Crescent, Edinburgh EH16 4SB, UK.

Developmental Biology
|December 4, 2003
PubMed
Summary

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Sonic hedgehog (SHH) signaling is not essential for prostate induction but is crucial for prostate growth, branching, and proliferation. Disrupting SHH signaling during development leads to aberrant epithelial differentiation, mimicking prostate intraepithelial neoplasia (PIN).

Area of Science:

  • Developmental Biology
  • Molecular Signaling
  • Urology

Background:

  • The Sonic hedgehog (SHH) signaling pathway plays a vital role in epithelial-mesenchymal interactions during tissue development and disease.
  • Its specific role in ventral prostate (VP) development in rats has not been fully elucidated.

Purpose of the Study:

  • To investigate the role of the SHH signaling pathway in rat ventral prostate (VP) development.
  • To determine if SHH signaling is critical for prostatic induction and subsequent growth, branching, and differentiation.

Main Methods:

  • Studied Shh and Ptc gene expression in relation to prostate development.
  • Utilized in vitro organ culture of mouse and rat urogenital sinus (UGS) explants.
  • Manipulated SHH signaling using cyclopamine and recombinant SHH in cultured rat VP explants.

Related Experiment Videos

  • Examined effects of SHH inhibition on prostatic duct morphology and epithelial proliferation and differentiation using immunohistochemistry (p63, cytokeratin 14).

    • Main Results:

    • SHH signaling is not critical for initial prostatic induction but is essential for later stages of VP development.
    • Disruption of SHH signaling reduced VP organ size, increased ductal tip number, and decreased epithelial proliferation.
    • SHH inhibition in the presence of testosterone accelerated ductal canalization and led to aberrant epithelial differentiation, resembling cribriform prostatic intraepithelial neoplasia (PIN).

    Conclusions:

    • SHH signaling is indispensable for prostate growth, branching morphogenesis, and maintaining normal epithelial proliferation.
    • Androgen-stimulated prostate growth without SHH signaling results in precocious and aberrant epithelial differentiation, potentially contributing to neoplastic changes like PIN.