Ablation in Mice of the mTORC Components raptor, rictor, or mLST8 Reveals that mTORC2 Is Required for Signaling to Akt-FOXO and PKCα, but Not S6K1

David A. Guertin, Deanna M. Stevens, Carson C. Thoreen, Aurora A. Burds, Nada Y. Kalaany, Jason Moffat, Michael Brown, Kevin J. Fitzgerald, David M. Sabatini

Research output: Contribution to journalArticle

979 Scopus citations

Abstract

The mTOR kinase controls cell growth, proliferation, and survival through two distinct multiprotein complexes, mTORC1 and mTORC2. mTOR and mLST8 are in both complexes, while raptor and rictor are part of only mTORC1 and mTORC2, respectively. To investigate mTORC1 and mTORC2 function in vivo, we generated mice deficient for raptor, rictor, or mLST8. Like mice null for mTOR, those lacking raptor die early in development. However, mLST8 null embryos survive until e10.5 and resemble embryos missing rictor. mLST8 is necessary to maintain the rictor-mTOR, but not the raptor-mTOR, interaction, and both mLST8 and rictor are required for the hydrophobic motif phosphorylation of Akt/PKB and PKCα, but not S6K1. Furthermore, insulin signaling to FOXO3, but not to TSC2 or GSK3β, requires mLST8 and rictor. Thus, mTORC1 function is essential in early development, mLST8 is required only for mTORC2 signaling, and mTORC2 is a necessary component of the Akt-FOXO and PKCα pathways.

Original languageEnglish (US)
Pages (from-to)859-871
Number of pages13
JournalDevelopmental cell
Volume11
Issue number6
DOIs
StatePublished - Dec 1 2006

Keywords

  • DEVBIO
  • SIGNALING

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology

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    Guertin, D. A., Stevens, D. M., Thoreen, C. C., Burds, A. A., Kalaany, N. Y., Moffat, J., Brown, M., Fitzgerald, K. J., & Sabatini, D. M. (2006). Ablation in Mice of the mTORC Components raptor, rictor, or mLST8 Reveals that mTORC2 Is Required for Signaling to Akt-FOXO and PKCα, but Not S6K1. Developmental cell, 11(6), 859-871. https://doi.org/10.1016/j.devcel.2006.10.007