Author(s): Yutaka Yonemura, Yoshio Endo, Emel Canbay, Yang Liu, Haruaki Ishibashi, Kazuyoshi Takeshita, Akiyoshi Mizumoto, Masamitu Hirano, Nobuyuki Takao, Masumi Ichinose, Yan Li, Shun-ichirou Ogura
Background. Photodynamic diagnosis (PDD) with 5-aminolevulinic acid (ALA) was used to detect peritoneal metastasis (PM). This study was done to verify the roles of the expressions of the peptide transporter PEPT1 and ATP-binding cassette transporter ABCG2 genes on the selection of patients in ALA PDD. Methods. The study group comprised 138 patients with PM. After oral administration of 5-ALA, PM was evaluated by PDD. Tissue protoporphyrin IX (PpIX) levels, and PEPT1/ABCG2 mRNA expressions were determined. Results. The tumor detection rate on PDD was 45.6% (63/138). PDD is a safe technique for the detection of PM from ovarian cancer, mesothelioma, and colorectal cancer. PpIX levels of ALA-PDD-positive PM were significantly higher than those of ALA-PDD-negative PM. The PpIX levels in PM that simultaneously expressed PEPT1 and ABCG2 mRNA were significantly higher than those in PM that expressed either PEPT1 or ABCG2 mRNA, as well as PM that expressed neither PEPT1 nor ABCG2 mRNA. PM with PEPT1 mRNA up-regulation showed simultaneous up-regulation of ABCG2 mRNA. PpIX accumulates in PM with PEPT1 up-regulation. At the same time, PpIX may be excreted into stromal tissue through ABCG2 transporter, resulting in the accumulation of excess PpIX in the stromal tissue near cancer cells. Conclusions. Preoperative evaluations of the expressions of the PEPT1 and ABCG2 genes by RT-PCR methods might facilitate the selection of patients most likely to benefit from ALA-PDD.
aminolevulinic acid, photosensitizer, photodynamic diagnosis, peritoneal surface malignancies, PEPT1, ABCG2, ferrochelatase
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