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FOXO Transcription Factors Rewire Metabolism in U87MG Glioblastoma Cells
Author(s) -
Keniry Megan,
Fanniel Victor,
Martinez Eduardo,
Sanchez Lilia,
Vazquez Neftali,
Lopez Alma,
Cedillo Raechel,
Respondek Christa,
Gilkerson Robert,
InnisWhitehouse Wendy,
Scheunzel Erin
Publication year - 2018
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.2018.32.1_supplement.804.36
Subject(s) - transcription factor , biology , pi3k/akt/mtor pathway , nuclear localization sequence , microbiology and biotechnology , transcription (linguistics) , gene , cancer research , nucleus , signal transduction , genetics , linguistics , philosophy
Evolutionarily‐conserved FOXO transcription factors reside in the nucleus of glioblastoma and basal breast cancer cells that harbor constitutive PI3K Pathway output. Nuclear localization of FOXO factors in this setting challenges canonical PI3K models, as this pathway typically induces FOXO localization to the cytoplasm. Simultaneous PI3K activation and nuclear FOXO have also been observed in a set of diffuse large B cell lymphomas and embryonic stem cells. To interrogate the function of nuclear‐localized FOXO transcription factors in glioblastoma and basal breast cancer cell lines, we have constructed genetic models using CRISPR Cas9 genome editing technology. Our evidence indicates that FOXO factors drive metabolic changes in these cancers. FOXO disruption mutants showed increased mitochondrial membrane potential by TMRE staining and subsequent flow cytometric analyses. FOXO factors promote PEPCK gene expression to likely impact carbon utilization. These findings suggest that the nuclear localization of FOXO transcription factors causes metabolic rewiring in glioblastoma and basal breast cancer. Support or Funding Information This work was supported by HHMI 52007568 (N.V.), USDA Step 2 2015‐38422‐24061(A.L., R.G,), USDA H.S.I. 2016‐38422‐25760 (M.K. and E.M), NIH 1SC3GM11666901 (R.G.), UTRGV College of Sciences (COS) Seed Grant (M.K.), and NSF Advance 1209210 (M.K). This abstract is from the Experimental Biology 2018 Meeting. There is no full text article associated with this abstract published in The FASEB Journal .