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The results showed that, in the CONTR, ORCH, and ORCH+TEST groups, epithelial thickness, Vv of smooth muscle, and cell density in smooth muscle bundles were not significantly affected by the different treatments. However, http://www.selleckchem.com/products/ly2157299.html hormone deprivation and replacement exerted significant effects on the composition and organization of the extracellular matrix of the bladder wall. Thus, the relative content of elastic fibers decreased by 19% in ORCH animals compared with the CONTR group. Notably, this change was prevented by testosterone because elastic fiber content in ORCH+ TEST animals was not significantly different from that of the CONTR group. Although the biochemical concentration of total collagen was quite similar in the CONTR, ORCH, and ORCH+TEST groups, there were noticeable differences http://www.selleckchem.com/products/z-vad-fmk.html in the structural organization of this protein in the muscular layer of the vesicle wall, as revealed by the Sirius red polarization method. Accordingly, whereas a green birefringence was observed in most of the CONTR animals (Figure 1A), the predominant color pattern in the ORCH group was a mixture of comparable amounts of yellow-orange-red and green (Figure 1B). In the ORCH+TEST group, however, a green birefringence prevailed in the animals (Figure 1C). The chi-square test showed that these changes in the frequency distribution of color patterns were significant (P http://www.selleck.cn/products/XL184.html in the lamina propria. To further analyze the organization of the vesicle stroma, tissue samples were treated with alkali, and the resulting acellular preparations were observed under SEM. Visual evaluation of the obtained images revealed that, in CONTR animals, the stroma is made up of thick and wavy bundles of tightly packed fibrils, which are interspersed with a loose meshwork of fine fibrils (Figure 2A). In the ORCH group, the relative amount of the meshwork was greatly reduced, whereas the thick bundles remained unchanged (Figure 2B). On the other hand, in ORCH+TEST animals (Figure 2C), the density of the meshwork was similar to that of CONTR. One of the most important physiological alterations that affect aged men is androgen deficiency. It can affect many organs and systems. The use of hormone replacement in hypogonadic men has already been analyzed by different authors (Naharci et al, 2007; Pradidarcheep, 2008; Traish et al, 2009; Yeap et al, 2009a,b). Studies using animal models have demonstrated that castration and hormone replacement are related to physiological, biochemical, and structural alterations (Heaton and Varrin, 1994; Alcorn et al, 1999; Dai et al, 1999; Reader et al, 2001; Li et al, 2002; Shen et al, 2003; Gooren and Saad, 2006).