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标题：BCH, an Inhibitor of System L Amino Acid Transporters, Induces Apoptosis in Cancer Cells
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作者：Chun Sung Kim ; Seon-Ho Cho ; Hong Sung Chun 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2008
卷号：31
期号：6
页码：1096-1100
DOI：10.1248/bpb.31.1096
出版社：The Pharmaceutical Society of Japan
摘要：Purpose: L -Type amino acid transporter 1 (LAT1) is highly expressed in cancer cells to support their continuous growth and proliferation. We have examined the effect of 2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH), an inhibitor of system L amino acid transporters, and the mechanism by which BCH suppresses cell growth in cancer cells. Methods: The effect of BCH and the mechanism of BCH on cell growth suppression in cancer cells were examined using amino acid transport measurement, MTT assay, DNA fragmentation analysis, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay and immunoblotting. Results: BCH inhibited L -leucine transport in a concentration-dependent manner, and it inhibited cell growth in a time-dependent manner in KB human oral epidermoid carcinoma cells, Saos2 human osteogenic sarcoma cells and C6 rat glioma cells. The formation of a DNA ladder was observed, and the number of TUNEL-positive cells was increased with BCH treatment. Furthermore, the proteolytic processing of caspase-3 in KB and C6 cells and of caspase-7 in KB, Saos2 and C6 cells was increased by BCH treatment. Conclusion: These results suggest that the inhibition of LAT1 activity by BCH leads to apoptotic cancer cell death by inducing intracellular depletion of neutral amino acids necessary for cancer cell growth.
关键词：L -type amino acid transporter;cancer cell;apoptosis;2-aminobicyclo-(2,2,1)-heptane-2-carboxylic acid;anti-cancer therapy