title: Estrogen-initiated transformation of prostate epithelium derived from normal human prostate stem-progenitor cells.
abstract: The present study sought to determine whether estrogens with testosterone support are sufficient to transform the normal human prostate epithelium and promote progression to invasive adenocarcinoma using a novel chimeric prostate model. Adult prostate stem/early progenitor cells were isolated from normal human prostates through prostasphere formation in three-dimensional culture. The stem/early progenitor cell status and clonality of prostasphere cells was confirmed by immunocytochemistry and Hoechst staining. Normal prostate progenitor cells were found to express estrogen receptor α, estrogen receptor β, and G protein-coupled receptor 30 mRNA and protein and were responsive to 1 nm estradiol-17β with increased numbers and prostasphere size, implicating them as direct estrogen targets. Recombinants of human prostate progenitor cells with rat urogenital sinus mesenchyme formed chimeric prostate tissue in vivo under the renal capsule of nude mice. Cytodifferentiation of human prostate progenitor cells in chimeric tissues was confirmed by immunohistochemistry using epithelial cell markers (p63, cytokeratin 8/18, and androgen receptor), whereas human origin and functional differentiation were confirmed by expression of human nuclear antigen and prostate-specific antigen, respectively. Once mature tissues formed, the hosts were exposed to elevated testosterone and estradiol-17β for 1-4 months, and prostate pathology was longitudinally monitored. Induction of prostate cancer in the human stem/progenitor cell-generated prostatic tissue was observed over time, progressing from normal histology to epithelial hyperplasia, prostate intraepithelial neoplasia, and prostate cancer with local renal invasion. These findings provide the first direct evidence that human prostate progenitor cells are estrogen targets and that estradiol in an androgen-supported milieu is a carcinogen for human prostate epithelium.
authors.affiliation: Department of Urology, University of Illinois at Chicago, Chicago, Illinois 60612, USA.
authors.forename: Wen-Yang
authors.initials: WY
authors.lastname: Hu
authors.forename: Guang-Bin
authors.initials: GB
authors.lastname: Shi
authors.forename: Hung-Ming
authors.initials: HM
authors.lastname: Lam
authors.forename: Dan-Ping
authors.initials: DP
authors.lastname: Hu
authors.forename: Shuk-Mei
authors.initials: SM
authors.lastname: Ho
authors.forename: Ikenna C
authors.initials: IC
authors.lastname: Madueke
authors.forename: Andre
authors.initials: A
authors.lastname: Kajdacsy-Balla
authors.forename: Gail S
authors.initials: GS
authors.lastname: Prins
mesh_terms: D000328:Adult; D053687:Adult Stem Cells / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002471:Cell Transformation, Neoplastic / Q000187:drug effects*; D002478:Cells, Cultured; D004848:Epithelium / Q000187:drug effects* / Q000378:metabolism; D004967:Estrogens / Q000009:adverse effects*; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D011467:Prostate / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D011471:Prostatic Neoplasms / Q000209:etiology* / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism; D055815:Young Adult
chemical_list: D004967:Estrogens; D011960:Receptors, Estrogen