Published in:
01-12-2014 | Research Article
Accumulation of Trans-1-Amino-3-[18F]Fluorocyclobutanecarboxylic Acid in Prostate Cancer due to Androgen-Induced Expression of Amino Acid Transporters
Authors:
Hiroyuki Okudaira, Shuntaro Oka, Masahiro Ono, Takeo Nakanishi, David M. Schuster, Masato Kobayashi, Mark M. Goodman, Ikumi Tamai, Keiichi Kawai, Yoshifumi Shirakami
Published in:
Molecular Imaging and Biology
|
Issue 6/2014
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Abstract
Purpose
Androgens play a crucial role in prostate cancer progression, and trans-1-amino-3-[18F]fluorocyclobutanecarboxylic acid (anti-[18 F]FACBC) are used for visualization of prostate cancer. We examined the effect of androgen on the expression of amino acid transporters related to anti-[18F]FACBC transport and uptake of trans-1-amino-3-fluoro-[1-14C]cyclobutanecarboxylic acid (anti-[14C]FACBC).
Procedures
Expression of amino acid transporters and uptake of anti-[14C]FACBC in androgen receptor (AR)-positive LNCaP and AR-negative DU145 human prostate cancer cells cultured with/without 5α-dihydrotestosterone (DHT) and the effect of bicalutamide, an AR antagonist, on DHT-associated changes were investigated.
Results
DHT stimulated the expression of amino acid transporters ASCT2, SNAT5, 4F2 heavy chain, and LAT3 in LNCaP but not in DU145 cells. Anti-[14C]FACBC uptake was enhanced, in a DHT-dependent manner, in LNCaP cells only.
Conclusions
DHT enhanced the expression of ASCT2, the transporter responsible for anti-[18F]FACBC uptake, thereby increasing anti-[14C]FACBC uptake in AR-positive LNCaP cells. Androgen-mediated induction may contribute to the distinct anti-[18F]FACBC accumulation pattern in prostate cancer.