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Related Experiment Videos

Urethral replacement using cell seeded tubularized collagen matrices.

Roger E De Filippo1, James J Yoo, Anthony Atala

  • 1Department of Urology, Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.

The Journal of Urology
|September 28, 2002
PubMed
Summary
This summary is machine-generated.

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Tissue engineering with cell-seeded collagen matrices successfully restored urethral function in rabbits. Acellular matrices alone resulted in strictures, highlighting the importance of autologous cells for tubularized urethral replacement.

Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Urology

Background:

  • Acellular collagen matrices from bladder submucosa are effective for onlay urethral replacement.
  • The potential for these matrices in tubularized urethral replacement remains to be fully explored.

Purpose of the Study:

  • To investigate the efficacy of acellular collagen matrices, with or without autologous cells, for tubularized urethral replacement.
  • To assess the tissue integration and functional outcomes of cell-seeded versus acellular matrices in a rabbit model.

Main Methods:

  • Tubularized acellular collagen matrices were fabricated and seeded with autologous bladder cells.
  • Urethroplasty was performed in rabbits using cell-seeded (n=12) or acellular (n=12) matrices.
  • Serial urethrography, histological analysis, immunocytochemistry, Western blots, and organ bath studies were conducted.

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Main Results:

  • Cell-seeded matrices maintained urethral caliber without strictures, exhibiting normal urethral architecture with epithelial and smooth muscle layers.
  • Acellular matrices resulted in strictures and graft collapse.
  • Tissue-engineered constructs showed contractility and neurotransmitter receptor expression.

Conclusions:

  • Collagen matrices seeded with autologous cells promote normal urethral tissue formation for tubularized replacement.
  • Acellular tubularized collagen matrices lead to poor tissue formation and strictures.
  • Cell-seeded collagen matrices represent a promising alternative for tubularized urethral segment reconstruction.