Published in:
01-06-2014 | Research Article
Differences in Transport Mechanisms of trans-1-Amino-3-[18F]Fluorocyclobutanecarboxylic Acid in Inflammation, Prostate Cancer, and Glioma Cells: Comparison with l-[Methyl-11C]Methionine and 2-Deoxy-2-[18F]Fluoro-d-Glucose
Authors:
Shuntaro Oka, Hiroyuki Okudaira, Masahiro Ono, David M. Schuster, Mark M. Goodman, Keiichi Kawai, Yoshifumi Shirakami
Published in:
Molecular Imaging and Biology
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Issue 3/2014
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Abstract
Purpose
We aimed to elucidate trans-1-amino-3-[18F]fluorocyclobutanecarboxylic acid (anti-[18F]FACBC) uptake mechanisms in inflammatory and tumor cells, in comparison with those of l-[methyl-11C]methionine ([11C]Met) and 2-deoxy-2-[18F]fluoro-d-glucose ([18F]FDG).
Procedures
Using carbon-14-labeled tracers, in vitro time-course, pH dependence, and competitive inhibition uptake experiments were performed in rat inflammatory (T cells, B cells, granulocytes, macrophages), prostate cancer (MLLB2), and glioma (C6) cells.
Results
Anti-[14C]FACBC uptake ratios of T/B cells to tumor cells were comparable, while those of granulocytes/macrophages to tumor cells were lower than those for [14C]FDG. Over half of anti-[14C]FACBC uptake by T/B and tumor cells was mediated by Na+-dependent amino acid transporters (system ASC), whereas most [14C]Met transport in all cells was mediated by Na+-independent carriers (system L).
Conclusions
The low anti-[18F]FACBC accumulation in granulocytes/macrophages may be advantageous in discriminating inflamed regions from tumors. The significant anti-[18F]FACBC uptake in T/B cells may cause false-positives in some cancer patients who undergo FACBC-positron emission tomography (PET).