Related Experiment Videos
Urethral seam formation and hypospadias
L S Baskin1, A Erol, P Jegatheesan
1Department of Urology, University of California School of Medicine, San Francisco, CA 94143-0738, USA. lbaskinl@urol.ucsf.edu
Cell and Tissue Research
|September 27, 2001
Summary
Normal male urethra development involves epithelial seam remodeling via cellular migration. Disruption of this process may cause hypospadias, a congenital condition.
Area of Science:
- Developmental Biology
- Urology
- Genetics
Background:
- Understanding normal male urethral formation is crucial for elucidating the etiology of hypospadias.
- The study introduces the concept of epithelial seam formation and remodeling during urethral development.
Purpose of the Study:
- To describe urethral formation in the mouse embryo.
- To compare mouse urethral development with human embryonic development.
- To investigate the mechanisms of epithelial seam formation and remodeling.
Main Methods:
- Histology
- Immunohistochemistry
- Three-dimensional reconstruction
- Comparative analysis of embryonic mouse and human specimens.
Main Results:
- Urethral formation involves the fusion of urethral folds, creating a midline epithelial seam.
- The epithelial seam is remodeled by cellular migration, not epithelial-mesenchymal transformation or apoptosis.
- Apoptotic activity was observed in mesenchymal cells within the remodeling seam.
Conclusions:
- Urethral seam formation and remodeling mechanisms are conserved between mice and humans.
- Cellular migration is the primary mechanism for epithelial seam remodeling during urethral development.
- Disruption of epithelial fusion, remodeling, and cellular migration is postulated to lead to hypospadias.