Temporal diabetes- and diuresis-induced remodeling of the urinary bladder in the rat.
The natural history of diabetes mellitus-induced remodeling of the urinary bladder is poorly understood. In this study, we examined temporal remodeling of the bladder in diabetic and diuretic rats. Male Sprague-Dawley rats were divided into three groups: streptozotocin-induced diabetic, 5% sucrose-induced diuretic, and age-matched control. Micturition and morphometric characteristics were evaluated using metabolic cages and light-microscopic examination of the bladder 4 days and 1, 2, 3, and 9 wk after induction. Digital image analysis was used to quantify equatorial cross-sectional areas of bladder tissue and lumen, as well as relative content of the three primary tissue components: smooth muscle, urothelium, and collagen. Diabetes and diuresis caused significant increases in fluid intake, urine output, and bladder weight. In both groups, progressive increases were observed in lumen area from 4 days to 3 wk after induction and in wall area from 2 to 3 wk after induction. Wall thickness decreased within the first 2 wk in the diabetic and diuretic rats but returned to control at 3 and 9 wk. As a percentage of total cross-sectional area, smooth muscle area increased, urothelium area was unchanged, and collagen area decreased in diabetic and diuretic rats after 2-3 wk compared with control rats. In conclusion, diabetes and diuresis induced similar bladder remodeling. Diabetes-induced diuresis caused adaptive physical changes in rat bladder by 4 days after induction; remodeling was observed by 2-3 wk after induction and remained stable from 3 to 9 wk.
Liu
Guiming
G
Glickman Urological Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Daneshgari
Firouz
F
D000818:Animals; D003921:Diabetes Mellitus, Experimental / Q000378:metabolism*; D004231:Diuresis / Q000502:physiology*; D004232:Diuretics / Q000494:pharmacology; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D013395:Sucrose / Q000494:pharmacology*; D013997:Time Factors; D001743:Urinary Bladder / Q000033:anatomy & histology* / Q000502:physiology*
D004232:Diuretics; D013395:Sucrose