Activated Ras requires autophagy to maintain oxidative metabolism and tumorigenesis

Jessie Yanxiang Guo, Hsin Yi Chen, Robin Mathew, Jing Fan, Anne M. Strohecker, Gizem Karsli-Uzunbas, Jurre J. Kamphorst, Guanghua Chen, Johanna M.S. Lemons, Vassiliki Karantza, Hilary A. Coller, Robert S. DiPaola, Celine Gelinas, Joshua D. Rabinowitz, Eileen White

Research output: Contribution to journalArticle

724 Scopus citations

Abstract

Autophagy is a catabolic pathway used by cells to support metabolism in response to starvation and to clear damaged proteins and organelles in response to stress. We report here that expression of a H-rasV12 or K-ras V12 oncogene up-regulates basal autophagy, which is required for tumor cell survival in starvation and in tumorigenesis. In Ras-expressing cells, defective autophagosome formation or cargo delivery causes accumulation of abnormal mitochondria and reduced oxygen consumption. Autophagy defects also lead to tricarboxylic acid (TCA) cycle metabolite and energy depletion in starvation. As mitochondria sustain viability of Ras-expressing cells in starvation, autophagy is required to maintain the pool of functional mitochondria necessary to support growth of Ras-driven tumors. Human cancer cell lines bearing activatingmutations in Ras commonly have high levels of basal autophagy, and, in a subset of these, down-regulating the expression of essential autophagy proteins impaired cell growth. As cancers with Ras mutations have a poor prognosis, this ''autophagy addiction'' suggests that targeting autophagy and mitochondrial metabolism are valuable new approaches to treat these aggressive cancers.

Original languageEnglish (US)
Pages (from-to)460-470
Number of pages11
JournalGenes and Development
Volume25
Issue number5
DOIs
StatePublished - Mar 1 2011

All Science Journal Classification (ASJC) codes

  • Genetics
  • Developmental Biology

Keywords

  • Autophagy
  • Cancer
  • Metabolism
  • Mitochondria
  • Ras
  • p62

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  • Cite this

    Guo, J. Y., Chen, H. Y., Mathew, R., Fan, J., Strohecker, A. M., Karsli-Uzunbas, G., Kamphorst, J. J., Chen, G., Lemons, J. M. S., Karantza, V., Coller, H. A., DiPaola, R. S., Gelinas, C., Rabinowitz, J. D., & White, E. (2011). Activated Ras requires autophagy to maintain oxidative metabolism and tumorigenesis. Genes and Development, 25(5), 460-470. https://doi.org/10.1101/gad.2016311