EGFR signaling through an Akt-SREBP-1-dependent, rapamycin-resistant pathway sensitizes glioblastomas to antilipogenic therapy

Deliang Guo, Robert M. Prins, Julie Dang, Daisuke Kuga, Akio Iwanami, Horacio Soto, Kelly Y. Lin, Tiffany T. Huang, David Akhavan, M. Benjamin Hock, Shaojun Zhu, Ava A. Kofman, Steve J. Bensinger, William H. Yong, Harry V. Vinters, Steve Horvath, Andrew D. Watson, John G. Kuhn, H. Ian Robins, Minesh P. MehtaPatrick Y. Wen, Lisa M. Deangelis, Michael D. Prados, Ingo K. Mellinghoff, Timothy F. Cloughesy, Paul S. Mischel

研究成果: Article査読

184 被引用数 (Scopus)

抄録

Glioblastoma, the most common malignant brain tumor, is among the most lethal and difficult cancers to treat. Although epidermal growth factor receptor (EGFR) mutations are frequent in glioblastoma,their clinical relevance is poorly understood. Studies of tumors from patients treated with the EGFR inhibitor lapatinib revealed that EGFR induces the cleavage and nuclear translocation of the master transcriptional regulator of fatty acid synthesis, sterol regulatory element-binding protein 1 (SREBP-1).This response was mediated by Akt; however, clinical data from rapamycin-treated patients showed that SREBP-1 activation was independent of the mammalian target of rapamycin complex 1, possibly explaining rapamycin's poor efficacy in the treatment of such tumors. Glioblastomas without constitutively active EGFR signaling were resistant to inhibition of fatty acid synthesis, whereas introduction of a constitutively active mutant form of EGFR, EGFRvIII, sensitized tumor xenografts in mice to cell death, which was augmented by the hydroxymethylglutaryl coenzyme A reductase inhibitor atorvastatin. These results identify a previously undescribed EGFR-mediated prosurvivalmetabolic pathway and suggest new therapeutic approaches to treating EGFR-activated glioblastomas.

本文言語English
ページ(範囲)ra82
ジャーナルScience Signaling
2
101
DOI
出版ステータスPublished - 2009 12 15

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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