Journal Article

Characterization of androgen-regulated expression of CYP3A5 in human prostate

Anne-Mari Moilanen, Jukka Hakkola, Markku H. Vaarala, Saila Kauppila, Pasi Hirvikoski, Jussi T. Vuoristo, Robert J. Edwards and Timo K. Paavonen

in Carcinogenesis

Volume 28, issue 5, pages 916-921
Published in print May 2007 | ISSN: 0143-3334
Published online November 2006 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgl222
Characterization of androgen-regulated expression of CYP3A5 in human prostate

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Testosterone is needed for the growth and development of the prostate. Androgen deprivation therapy is used for the treatment of prostate cancer. CYP3A5 is a human drug-metabolizing cytochrome P450 enzyme that metabolizes testosterone to the inactive 6β-hydroxylated metabolite. We identified CYP3A5 as a novel androgen-regulated gene in human prostate by GeneChip analysis of human prostate tissues obtained from patients 3 days after therapeutic castration and from control patients. We further showed androgen induction of CYP3A5 messenger RNA (mRNA) in LNCaP prostate cancer cell line. Immunoblotting studies revealed CYP3A5 protein expression in all prostate samples studied. Immunohistochemistry and in situ hybridization was used for localization of CYP3A5 expression in prostate tissue. CYP3A5 was detected both in luminal and in basal epithelial cells of human prostate. Androgen response element was identified in the CYP3A5 proximal promoter and in electrophoretic mobility shift assay androgen receptor was found to bind this element. Androgen induction was abolished by mutation of the response element. We suggest that CYP3A5 is a part of an autoregulatory feedback loop controlling prostate cell exposure to androgens.

Journal Article.  5232 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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