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Smooth muscle differentiation and cell turnover in mouse detrusor development
N Smeulders1, A S Woolf, D T Wilcox
1Nephro-Urology Unit, Institute of Child Health, University College London, London, United Kingdom.
The Journal of Urology
|December 18, 2001
Summary
Mouse detrusor muscle growth involves complex changes in cell turnover and protein expression. Detrusor muscle cell differentiation and proliferation are inversely related during development.
Area of Science:
- Urology
- Developmental Biology
- Muscle Physiology
Background:
- The detrusor muscle forms the bladder wall and its differentiation is crucial for bladder function.
- Understanding normal detrusor muscle development is essential for studying bladder pathologies.
Purpose of the Study:
- To systematically analyze detrusor muscle differentiation in mice.
- To investigate cell turnover, including proliferation and apoptosis.
- To examine the expression of alpha-smooth muscle actin and desmin during development.
Main Methods:
- Examined embryonic days 14 and 18, and postnatal days 1 and 6.
- Assessed alpha-smooth muscle actin, desmin, and proliferating cell nuclear antigen via immunohistochemistry and Western blot.
- Detected apoptosis using end-labeling in tissue sections.
Main Results:
- Alpha-smooth muscle actin expression increased significantly from embryonic day 14 to 18 and became uniformly expressed postnatally.
- Desmin expression was minimal at embryonic day 14, increasing progressively thereafter.
- Proliferating cell nuclear antigen expression was highest at organ inception and decreased with development, with apoptosis only detected at embryonic day 14.
Conclusions:
- Mouse detrusor muscle growth involves intricate changes in muscle-specific protein expression and cell turnover.
- Detrusor muscle cell differentiation and proliferation exhibit an inverse relationship during development.
- These findings provide a baseline for future studies on abnormal mouse bladder development.