Everolimus prolonged survival in transgenic mice with EGFR-driven lung tumors

Masayuki Yasugi, Nagio Takigawa, Nobuaki Ochi, Kadoaki Ohashi, Daijiro Harada, Takashi Ninomiya, Toshi Murakami, Yoshihiro Honda, Eiki Ichihara, Mitsune Tanimoto, Katsuyuki Kiura

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Everolimus is an orally administered mTOR inhibitor. The effect, and mechanism of action, of everolimus on lung cancers with an epidermal growth factor receptor (EGFR) mutation remain unclear. Four gefitinib-sensitive and -resistant cell lines were used in the present work. Growth inhibition was determined using the MTT assay. Transgenic mice carrying the EGFR L858R mutation were treated with everolimus (10. mg/kg/day), or vehicle alone, from 5 to 20 weeks of age, and were then sacrificed. To evaluate the efficacy of everolimus in prolonging survival, everolimus (10. mg/kg/day) or vehicle was administered from 5 weeks of age. The four cell lines were similarly sensitive to everolimus. Expression of phosphorylated (p) mTOR and pS6 were suppressed upon treatment with everolimus in vitro, whereas the pAKT level increased. The numbers of lung tumors with a long axis exceeding 1. mm in the everolimus-treated and control groups were 1.9±0.9 and 9.4±3.2 (t-test, p<0.001), respectively. pS6 was suppressed during everolimus treatment. Although apoptosis and autophagy were not induced in everolimus-treated EGFR transgenic mice, angiogenesis was suppressed. The median survival time in the everolimus-treated group (58.0 weeks) was significantly longer than that in the control group (31.2 weeks) (logrank test, p<0.001). These findings suggest that everolimus had an indirect effect on tumor formation by inhibiting angiogenesis and might be effective to treat lung tumors induced by an activating EGFR gene mutation.

Original languageEnglish
Pages (from-to)201-209
Number of pages9
JournalExperimental Cell Research
Volume326
Issue number2
DOIs
Publication statusPublished - Aug 15 2014

Keywords

  • Adenocarcinoma
  • EGFR
  • Everolimus
  • MTOR
  • Non-small cell lung cancer

ASJC Scopus subject areas

  • Cell Biology

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