Influencia da ooforectomia e da reposição de estradiol no volume das fibras colagenas e no sistema elastico da bexiga, em ratas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Collagen and elastic fibers, which form the major components of the connective tissue, are present throughout the urinary bladder wall and are closely related to bladder compliance. Previous studies have focused mainly on the structural and quantitative alterations of the extracellular matrix fibers of the muscle layer related to conditions like aging and hormonal status. Experiments performed on animals to investigate the effect of ovarian hormones on bladder structure obtained contradictory results regarding the effeet of estrogen on connective tissue. We carried out quantitative morphometrie analysis ofrat bladders to investigate the possible effects of ovariectomy and successive estrogen replacement therapy on bladder wall structure. Sixty female Wistar rats (3 month old) were divided into six groups: Group 1- remained intact; Group 2 - bilateral ovariectomy; Group 3 - sham operated; Group 4 - bilateral ovariectomy followed by subcutaneous injection of 17J3-estradiol (lOmg/Kg per day for 12 weeks); Group 5 - sham operated followed by sesame oil replaeement (0,2ml per day, s.e, for 12 weeks); Group 6 -bilateral ovariectomy followed by sesame oil replacement (0,2ml per day, s.e, for 12 weeks). All the rats rested for 4 weeks following ovariectomy. Collagen and elastic fibers in rat bladder paraflin sections were stained using Sirius red and Weigert s resorein-fuehsin, respectively. The M-42 test grid system was used to determine the absolute volume and volumetric density of the fibers on the paraflin sections. The Kruskal-Wallis nonparametrie test was used to test the differences in the stereological findings of the six groups. A probability of p <0,05 was used as the eriterion of significance. A quiek examination showed that there were no major differences in the thickness and macroscopy of the control bladders and ovariectomized bladders with or without estradiol replacement. Ovariectomy as well as ovariectomy followed by estradiol treatment had no effect on bladder volume. A comparison of the stereological findings of the four groups showed no significant differences in the absolute volume (p= 0,12) and volumetrie density (P=0,24) of the collagen fibers. Analysis of the elastic system showed that there were no significant differences in the absolute volume (p=0,32) and volumetric density (p=0,09) of the groups. Long-term estrogen deprivation did not have a significant influence on extracellular matrix of the bladder. Ovariectomy and successive estrogen supplementation did not affect the collagen and elastic fiber concentration in the bladder wall of rats

ASSUNTO(S)

rato como animal de laboratorio bexiga tecido conjuntivo estradiol

ACESSO AO ARTIGO

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