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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Long-term inhibition of 5-alpha reductase and aromatase changes the cellular and extracellular compartments in gerbil ventral prostate at different postnatal ages

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Autor(es):
Corradi, Lara S. [1] ; Campos, Silvana G. P. [2] ; Santos, Fernanda C. A. [2, 3] ; Vilamaior, Patricia S. L. [3] ; Goes, Rejane M. [2] ; Taboga, Sebastiao R. [2]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Campinas State Univ UNICAMP, Inst Biol, Dept Cell Biol, Campinas, SP - Brazil
[2] UNESP, Inst Biosci Human & Exact Sci IBILCE, Dept Biol, BR-15054000 Sao Jose Do Preto, SP - Brazil
[3] Rio Preto Univ Ctr UNIRP, Sch Biol & Vet Med, Sao Jose Do Preto, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: International Journal of Experimental Pathology; v. 90, n. 1, p. 79-94, FEB 2009.
Citações Web of Science: 16
Resumo

As local steroid metabolism controls the bioavailability of active steroidal hormones in the prostate, the aim of this study, was to investigate the effects of absence of 5-alpha reductase (5 alpha-r) and aromatase (Aro) enzymes on prostatic cellular and extracellular components after long-term inhibition. Young, adult and old male Mongolian gerbils were treated orally, once a day, for 30 consecutive days, with Finasteride (10.0 mg/kg) and Letrozole (1.0 mg/kg) (5 alpha-r and Aro enzymes inhibitors respectively) simultaneously or separately. Animals were killed on 1, 7, 14 and 21 days post-treatment. Data obtained after double or single enzymatic inhibition with Finasteride and Letrozole demonstrated marked remodelling of epithelial and stromal compartments. During the post-treatment period, particularly on the first and the last analysed days, prostatic epithelial cells showed decreased cytoplasmic volume and secretory activity. In the stroma, collagen fibres had accumulated in the epithelial base and among smooth muscle cells, which showed reduced diameter and condensed cytoplasm, and some of them had a highly irregular external contour. Also in the sub-epithelial area, some fibroblasts acquired an activated phenotype besides increased deposits of amorphous granular material. In conclusion, the inhibition of 5 alpha-r and Aro enzymes affected, in a persistent manner, the structural and ultrastructural morphology of the prostate, irrespective of the gerbil's age. Hence these enzymes appear to be crucial in the maintenance of this gland during postnatal development. Also, these data bring more light to the complex issue of the mechanisms of local steroid metabolism and prostatic histology. Thus, the blockade of the steroid-metabolizing enzymes provided an important novel tool to study the relationship between sex steroids and normal physiology and diseases of the prostate. (AU)

Processo FAPESP: 04/01603-1 - Comparação dos efeitos de bloqueadores das enzimas 5-alfa-redutase e aromatase na próstata de gerbilos em diferentes idades
Beneficiário:Sebastião Roberto Taboga
Linha de fomento: Auxílio à Pesquisa - Regular