Cytosolic Aspartate Availability Determines Cell Survival When Glutamine Is Limiting

H. Furkan Alkan, Katharina E. Walter, Alba Luengo, Corina T. Madreiter-Sokolowski, Sarah Stryeck, Allison N. Lau, Wael Al-Zoughbi, Caroline A. Lewis, Craig J. Thomas, Gerald Hoefler, Wolfgang F. Graier, Tobias Madl, Matthew G. Vander Heiden*, Juliane G. Bogner-Strauss

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Mitochondrial function is important for aspartate biosynthesis in proliferating cells. Here, we show that mitochondrial aspartate export via the aspartate-glutamate carrier 1 (AGC1) supports cell proliferation and cellular redox homeostasis. Insufficient cytosolic aspartate delivery leads to cell death when TCA cycle carbon is reduced following glutamine withdrawal and/or glutaminase inhibition. Moreover, loss of AGC1 reduces allograft tumor growth that is further compromised by treatment with the glutaminase inhibitor CB-839. Together, these findings argue that mitochondrial aspartate export sustains cell survival in low-glutamine environments and AGC1 inhibition can synergize with glutaminase inhibition to limit tumor growth. Alkan et al. show that, under conditions in which cytosolic glutamine is limiting, mitochondrial aspartate export, via the aspartate-glutamate carrier 1 (AGC1), supports cell proliferation and cellular redox homeostasis and that AGC1 inhibition can synergize with glutaminase inhibition to limit tumor growth.

Original languageEnglish
Pages (from-to)706-720.e6
JournalCell Metabolism
Volume28
Issue number5
DOIs
Publication statusPublished - 6 Nov 2018

Keywords

  • AGC1
  • Aralar
  • aspartate-glutamate carrier
  • cancer metabolism
  • glutamine metabolism
  • SLC25A12

ASJC Scopus subject areas

  • Physiology
  • Molecular Biology
  • Cell Biology

Cooperations

  • BioTechMed-Graz

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  • Cite this

    Alkan, H. F., Walter, K. E., Luengo, A., Madreiter-Sokolowski, C. T., Stryeck, S., Lau, A. N., ... Bogner-Strauss, J. G. (2018). Cytosolic Aspartate Availability Determines Cell Survival When Glutamine Is Limiting. Cell Metabolism, 28(5), 706-720.e6. https://doi.org/10.1016/j.cmet.2018.07.021