Expressão e reposição estrogenica e androgenica no lobo ventral da prostata de camundongos diabeticos (NOD) frente a terapia insulinica / Androgen and estrogen replacement and expression in the ventral lobe of the prostate of non-obese diabetic mice (NOD) following insulin therapy

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Diabetes adversely affects prostate morphology and function through alterations in the hypothalamic-hypophyseal-gonadal axis. Thus, the aims of this study were to characterize morphological, proliferative and immunological features of the prostate of diabetic mice after long term glycemic control and hormonal replacement, and as well as to relate these parameters to prostate pathogenesis. A total of 40 mice Nod (Non-obese diabetic) and 8 control mice (BALB/c/Uni), 18 weeks old, were divided into six groups after 20 days of diabetes: the control group received a daily dose of 0.9% NaCl (5 mL/kg, s.c.) for 20 days, as did the diabetic group. The diabetic-insulin group received daily doses of NPH insulin (4-5 IU, s.c.), the diabetic-testosterone group received a supraphysiological dose of testosterone cypionate (5 mg/kg, s.c.) every other day for 20 days, the diabetic-estrogen group received a supraphysiological dose of 17ß-estradiol (25 µg/kg, s.c.) every other day for 20 days and the diabetic-insulin-testosterone-estrogen group received insulin, testosterone and estrogen, simultaneously, at the same concentrations given to the other groups. The mice were sacrificed after 20 days of treatment and samples from the prostatic ventral lobe were processed for morphological, morphometrical, immunological, western blotting and hormonal analyses. The results showed structural disorganization and diminished adhesion proteins, a and b dystroglycans, which were more intense in the diabetic group than in the other groups. The diabetic state showed a proliferation and apoptosis rate that was two times higher than that found in the control group. Also, there was a decrease in serum testosterone levels (diabetic mice and diabetic-insulin-testosteroneestrogen mice had the greatest and smallest decreases, respectively) and in the level of androgen receptor immunolocalization. The serum estrogen level and its receptor showed changes opposite to those of testosterone and its receptor. The greatest IGF receptor localization occurred in diabetic mice. Thus, it could be concluded that diabetes disturbed the prostatic hormonal balance and the stroma-epithelium interaction, leading to morphological and functional imbalance of this organ characterized by the decrease immunolocalization of the adhesion proteins. Concomitant treatment with insulin and steroid hormone therapy was determinative for glandular structural and hormonal restoration. Furthermore, the increased immunolocalization of IGF-1 suggested that diabetes may be an important factor to the mitogenic process. However, hormonal therapy did not restore the distribution of IGF-1 to normal. On the other hand, concomitant treatment with insulin and steroid hormone therapy showed partial recovery of the IGFR-1 levels. A proper understanding of the relationship between these two factors could improve the current therapies for treating prostate diseases as well as diagnostics.

ASSUNTO(S)

hormonios esteroides gonadais insulin diabetes morphology immunohistochemistry diabetes morfologia imunohistoquimica insulina gonadal steroid hormones

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