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Androgen‐dependent regulation of medium and long chain fatty acids uptake in prostate cancer
Author(s) -
Pinthus Jehonathan H.,
Lu JianPing,
Bidaisee Laure A.,
Lin Helen,
Bryskine Inna,
Gupta Radhey S.,
Singh Gurmit
Publication year - 2007
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.20609
Subject(s) - bicalutamide , lncap , androgen , prostate cancer , androgen receptor , endocrinology , dihydrotestosterone , medicine , chemistry , testosterone (patch) , flow cytometry , biology , microbiology and biotechnology , hormone , cancer
BACKGROUND Epidemiological and experimental studies suggest that both fatty acids and androgens have a role in the development and progression of prostate cancer (PC). Plasma membrane fatty acid binding protein (FABP pm ) is a transporter of medium and long chain fatty acids (MCFA and LCFA) across the plasma membrane, and is identical to the mitochondrial protein aspartate aminotransferase (mAAT) that is regulated by testosterone only in prostate epithelial cells, a site where PC initially develops. We therefore hypothesized that FABP pm is also regulated by androgens. METHODS We examined the effect of a synthetic androgen, R1881, and that of androgen receptor (AR) blocker, bicalutamide, on the expression of FABP pm and mAAT and on the uptake of fatty acids in the androgen‐sensitive LNCaP, androgen responsive 22rv1 and androgen‐independent CL1 human PC cells. This was done using immunofluorescence and confocal microscopy, Western blot, flow cytometry, and 3 H‐oleate uptake studies. RESULTS Androgen supplementation increased the cellular and surface expression of FABP pm and mAAT and increased the uptake of fluorescently labeled MCFA and LCFA and that of 3 H‐oleate only in PC cells that express the AR. Bicalutamide inhibited this phenomenon. CONCLUSIONS The uptake of MCFA and LCFA into PC cells is androgen regulated as well as the expression of FABP pm and mAAT. Prostate 67: 1330–1338, 2007. © 2007 Wiley‐Liss, Inc.