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3H-thymidine uptake by the rat urinary bladder after partial outflow obstruction
M Saito1, P A Longhurst, M Murphy
1Division of Urology, University of Pennsylvania School of Medicine, Philadelphia.
Neurourology and Urodynamics
|January 1, 1994
Summary
Partial outflow obstruction significantly increases bladder mass by promoting cell proliferation in the urothelium and connective tissue, followed by smooth muscle. These changes in bladder wall proliferation are time-dependent following obstruction.
Area of Science:
- Urology
- Cell Biology
- Physiology
Background:
- Partial outflow obstruction causes significant bladder mass increase.
- The specific tissue compartments (hypertrophy, hyperplasia) responsible for this increase are not fully understood.
Purpose of the Study:
- To investigate time-related changes in DNA synthesis and cell distribution within bladder tissue compartments following partial outflow obstruction.
- To differentiate between cellular changes in urothelium, connective tissue, and smooth muscle.
Main Methods:
- Rats underwent partial outlet obstruction or sham surgery.
- 3H-thymidine uptake and autoradiography were used to assess DNA synthesis and cell proliferation.
- Analysis focused on urothelium, connective tissue, and smooth muscle compartments over 14 days.
Main Results:
- Partial outlet obstruction led to a 2-fold increase in bladder mass over 14 days.
- DNA synthesis increased significantly at 1 day, peaking by 7 days, and returning to baseline by 14 days.
- Autoradiography revealed increased cell labeling in urothelium (1-3 days) and connective tissue (greater in obstructed vs. sham), followed by smooth muscle (3-7 days) in obstructed bladders.
Conclusions:
- Partial outflow obstruction induces time-dependent bladder wall proliferation.
- The urothelium and connective tissue are initially affected, with smooth muscle proliferation occurring later.
- These findings clarify the cellular mechanisms underlying bladder remodeling due to outflow obstruction.