Nobuaki Ochi
Department Kawasaki Medical School Kawasaki Medical School, Department of General Internal Medicine 4, Position Assistant Professor |
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Article types | 原著 |
Language | English |
Peer review | Peer reviewed |
Title | Src mediates ERK reactivation in gefitinib resistance in non-small cell lung cancer |
Journal | Formal name:Experimental cell research Abbreviation:Exp Cell Res ISSN code:1090-2422 |
Publisher | Elsevier |
Volume, Issue, Page | 322(1),pp.168-177 |
Author and coauthor | Nobuaki Ochi, Nagio Takigawa, Daijiro Harada, Masayuki Yasugi, Eiki Ichihara, Katsuyuki Hotta, Masahiro Tabata, Mitsune Tanimoto, Katsuyuki Kiura |
Authorship | Lead author |
Publication date | 2014/03 |
Summary | To study epidermal growth factor receptor-tyrosine kinase inhibitor (EGFR-TKI) resistance mechanisms, we established a novel gefitinib-resistant lung cancer cell line derived from an EGFR-mutant non-small cell lung cancer cell line (PC-9) pretreated with 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (designated PC9-GR). We found that gefitinib substantially suppressed the EGFR signaling pathway, whereas ERK was reactivated after several hours in PC9-GR but not in PC-9. The combination of gefitinib with ERK inhibition (by U0126) restored gefitinib susceptibility in PC9-GR, but PI3K-Akt inhibition with LY294002 did not. Although the levels of phosphorylated Src were up-regulated simultaneously with ERK reactivation, neither ERK suppression using U0126 nor an ERK-specific siRNA induced Src phosphorylation. Furthermore, dual inhibition of EGFR and Src restored gefitinib sensitivity in PC9-GR in vitro and in vivo. In conclusion, our results indicate that Src-mediated ERK reactivation may play a role in a novel gefitinib resistance mechanism, and that the combined use of gefitinib with a Src inhibitor may be a potent strategy to overcome this resistance. |
DOI | 10.1016/j.yexcr.2014.01.007 |
PMID | 24509171 |