Androgen receptors expression in the Mongolian gerbil ventral prostate / Expressão de receptores androgenicos no lobulo ventral da prostata do gerbilo da Mongolia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The normal growth, differentiation and maintenance of the morphofunctional integrity of the prostate gland are dependent on the interaction of constant levels of androgens with their receptors. The need to study the responses to hormones under several conditions and the effect of their blockage is due to the fact that the human prostate is the site of a great number of age-related diseases, and the ones with a major medical importance are prostate cancer and benign prostatic hyperplasia, which can both be treated with androgen suppression. The aim of this study was to analyze immunohistochemical degree of expression of androgen receptor (AR) of the ventral lobe of the gerbil prostate during different phases of the postnatal development employing differents treatments for androgen blocking. Seventy-five male gerbils were distributed, randomly, into 3 groups of 25 animals each, where each group corresponded to one phase of postnatal development: young, adult and aged phase. In each phase, it was possible to morphologically and stereologically analyze the compartments of prostatic ventral lobe, as well as to immunohistochemically analyze the degree of expression of androgen receptor. In addition, it was possible to establish the hormonal dosage of serum testosterone concentrations given the comparative approach of the expression of androgen receptors. There is a heterogeneous pattern of AR distribution in the prostatic ventral lobe throughout postnatal development, in which the younger animal is the higher, the interaction of circulating androgens that stimulate the AR expression in the compartments prostatics. The androgen blockage therapies decreased AR expression in the ventral lobe, but the androgen reposition after these blockages was not showed the same the degree of expression of androgen receptor near normal physiological conditions. The regulation and distribution of AR along the gerbil prostatic tissues are complex mechanisms that are likely to be genetically regulated by androgens prenatally or by other factors that are still unknown. The gerbil seems to be a valuable model in the attempt to improve the understanding of the morphophysiological and pathological behavior of this important gland in humans throughout aging and to stimulate new therapeutic ideas to fight prostate cancer

ASSUNTO(S)

prostata androgenos - antagonistas prostate immunohistochemical receptores de androgenos antiandrogens androgen receptors imunohistoquimica

ACESSO AO ARTIGO

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