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BMC Cancer
Published in: BMC Cancer 1/2016

Open Access 01-12-2016 | Research article

Epidermal growth factor signals regulate dihydropyrimidine dehydrogenase expression in EGFR-mutated non-small-cell lung cancer

Authors: Tetsuro Tominaga, Tomoshi Tsuchiya, Koji Mochinaga, Junichi Arai, Naoya Yamasaki, Keitaro Matsumoto, Takuro Miyazaki, Toshiya Nagasaki, Atsushi Nanashima, Kazuhiro Tsukamoto, Takeshi Nagayasu

Published in: BMC Cancer | Issue 1/2016

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Abstract

Background

It has been shown that epidermal growth factor receptor (EGFR) mutation status is associated with 5-fluorouracil (5-FU) sensitivity in non-small-cell lung cancer (NSCLC). However, the relationship between EGFR mutation status and dihydropyrimidine dehydrogenase (DPD), a 5-FU degrading enzyme, is unknown.

Methods

We elucidated the crosstalk among the EGFR signal cascade, the DPD gene (DPYD), and DPD protein expression via the transcription factor Sp1 and the effect of EGFR mutation status on the crosstalk.

Results

In the PC9 (exon19 E746-A750) study, EGF treatment induced up-regulation of both Sp1 and DPD; gefitinib, an EGFR-tyrosine kinase inhibitor (EGFR-TKI), and mithramycin A, a specific Sp-1 inhibitor, suppressed them. Among EGFR-mutated (PC9, HCC827; exon19 E746-A750 and H1975; exon21 L858R, T790M, gefitinib resistant) and -non-mutated (H1437, H1299) cell lines, EGF administration increased DPYD mRNA expression only in mutated cells (p < 0.05). Accordingly, gefitinib inhibited DPD protein expression only in PC9 and HCC827 cells, and mithramycin A inhibited it in EGFR-mutated cell lines, but not in wild-type. FU treatment decreased the level of cell viability more in gefitinib-treated EGFR-TKI sensitive cell lines. Further, combination treatment of FU and mithramycin A suppressed cell viability even in a gefitinib resistant cell line.

Conclusions

The EGFR signal cascade regulates DPD expression via Sp1 in EGFR mutant cells. These results might be a step towards new therapies targeting Sp1 and DPD in NSCLC with different EGFR mutant status.
Appendix
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Metadata
Title
Epidermal growth factor signals regulate dihydropyrimidine dehydrogenase expression in EGFR-mutated non-small-cell lung cancer
Authors
Tetsuro Tominaga
Tomoshi Tsuchiya
Koji Mochinaga
Junichi Arai
Naoya Yamasaki
Keitaro Matsumoto
Takuro Miyazaki
Toshiya Nagasaki
Atsushi Nanashima
Kazuhiro Tsukamoto
Takeshi Nagayasu
Publication date
01-12-2016
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2016
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/s12885-016-2392-0

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