Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
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Evaluation of Amino Acid-Mustard Transport as L-Type Amino Acid Transporter 1 (LAT1)-Mediated Alkylating Agents
Ken-ichi HosoyaHirokazu KyokoNaoki ToyookaAtsushi KatoMasahiro OrihashiMasatoshi TomiMasanori Tachikawa
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2008 Volume 31 Issue 11 Pages 2126-2130

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Abstract

The L-type amino acid transporter 1 (LAT1, SLC7A5) is an Na+-independent neutral amino acid transporter the expression of which is located in retinal endothelial cells. Due to its broad substrate selectivity, LAT1 has been proposed to mediate the transport of amino acid-related drugs across the blood-tissue barriers. Here, we have investigated the transport screening of amino acid-mustards using a conditionally immortalized rat retinal capillary endothelial cell line (TR-iBRB2) which expresses LAT1. We synthesized 5 amino acid-mustards: tyrosine-mustard, phenylglycine-mustard, alanine-mustard, ornithine-mustard, and lysine-mustard. LAT1-mediated [3H]L-phenylalanine (Phe) uptake by TR-iBRB2 cells was inhibited in a competitive manner by tyrosine-mustard and phenylglycine-mustard as well as melphalan (phenylalanine-mustard). Phenylglycine-mustard was able to induce the efflux of [3H]Phe preloaded into the TR-iBRB2 cells expressing LAT1 through the obligatory exchange mechanism, although tyrosine-mustard, alanine-mustard, ornithine-mustard, lysine-mustard, and melphalan did not induce any significant efflux. These findings suggest that phenylglycine-mustard is a better substrate for LAT1 than melphalan and other amino acid-mustards.

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© 2008 The Pharmaceutical Society of Japan
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