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Role of mesenchymal-epithelial interactions in normal bladder development
L S Baskin1, S W Hayward, P Young
1Department of Urology, University of California School of Medicine, San Francisco, USA.
The Journal of Urology
|November 1, 1996
Summary
Epithelial-mesenchymal interactions are crucial for bladder smooth muscle development. Studies show that bladder mesenchyme requires epithelial signals for smooth muscle differentiation, both in vivo and in vitro.
Area of Science:
- Developmental Biology
- Urology
- Tissue Engineering
Background:
- Smooth muscle differentiation is essential for bladder function.
- The specific cellular interactions driving bladder smooth muscle development are not fully understood.
Purpose of the Study:
- To investigate the role of cell-cell interactions, specifically between epithelium and mesenchyme, in bladder smooth muscle development.
- To determine if epithelial cues are necessary for smooth muscle differentiation.
Main Methods:
- Rat fetal bladders were dissected to isolate mesenchyme and urothelium.
- Specimens (intact bladder, mesenchyme alone, or mesenchyme-urothelium recombinants) were grafted in vivo or cultured in vitro.
- Immunocytochemistry was used to assess smooth muscle marker expression (actin, myosin, desmin).
- Cross-species grafting was performed to test inductive capacity.
Main Results:
- Grafts of intact bladder and mesenchyme-urothelium recombinants showed smooth muscle differentiation.
- Mesenchyme alone failed to differentiate into smooth muscle, both in vivo and in vitro.
- Cross-species grafting demonstrated urothelial induction of smooth muscle in rat mesenchyme.
Conclusions:
- Bladder smooth muscle differentiation is dependent on inductive signals from the urothelium.
- Epithelial-mesenchymal interactions are critical for the development of bladder smooth muscle.