Ras inhibition in glioblastoma down-regulates hypoxia-inducible factor-1α, causing glycolysis shutdown and cell death

Roy Blum, Jasmine Jacob-Hirsch, Ninette Amariglio, Gideon Rechavi, Yoel Kloog

Research output: Contribution to journalArticlepeer-review

159 Scopus citations

Abstract

Active Ras and phosphatidylinositol-3-kinase-dependent pathways contribute to the malignant phenotype of glioblastoma multiformes (GBM). Here we show that the Ras inhibitor trans-farnesylthiosalicylic acid (FTS) exhibits profound anti-oncogenic effects in U87 GBM cells. FTS inhibited active Ras and attenuated Ras signaling to extracellular signal-regulated kinase, phosphatidylinositol-3- kinase, and Akt. Concomitantly, hypoxia-inducible factor 1α (HIF-1α) disappeared, expression of key glycolysis pathway enzymes and of other HIF-1α-regulated genes (including vascular endothelial growth factor and the Glut-1 glucose transporter) was down-regulated, and glycolysis was halted. This led to a dramatic reduction in ATP, resulting in a severe energy crisis. In addition, the expression of E2F-regulated genes was down-regulated in the FTS-treated cells. Consequently, U87 cell growth was arrested and the cells died. These results show that FTS is a potent down-regulator of HIF-1α and might therefore block invasiveness, survival, and angiogenesis in GBM.

Original languageEnglish
Pages (from-to)999-1006
Number of pages8
JournalCancer Research
Volume65
Issue number3
StatePublished - 1 Feb 2005
Externally publishedYes

Fingerprint

Dive into the research topics of 'Ras inhibition in glioblastoma down-regulates hypoxia-inducible factor-1α, causing glycolysis shutdown and cell death'. Together they form a unique fingerprint.

Cite this