Cited by 118PI3K/AKT/mTOR signaling in cancerCancer-related Molecular PathwaysFOXO transcription factor regulation

A P53-Phosphoinositide Signalosome Regulates Nuclear AKT Activation

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Chen, Mo, Choi, Suyong, Wen, Tianmu, Chen, Changliang, Thapa, Narendra, Lee, Jeong Hyo, Cryns, Vincent L., Anderson, Richard A.·2022·Nature Cell Biology

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Abstract

The tumour suppressor p53 and PI3K-AKT pathways have fundamental roles in the regulation of cell growth and apoptosis, and are frequently mutated in cancer. Here, we show that genotoxic stress induces nuclear AKT activation through a p53-dependent mechanism that is distinct from the canonical membrane-localized PI3K-AKT pathway. Following genotoxic stress, a nuclear PI3K binds p53 in the non-membranous nucleoplasm to generate a complex of p53 and phosphatidylinositol 3,4,5-trisphosphate (PtdIns(3,4,5)P 3), which recruits AKT, PDK1 and mTORC2 to activate AKT and phosphorylate FOXO proteins, thereby inhibiting DNA damage-induced apoptosis. Wild-type p53 activates nuclear AKT in an on/off fashion following stress, whereas mutant p53 dose-dependently stimulates high basal AKT activity. The p53-PtdIns(3,4,5)P 3 complex is dephosphorylated to p53-phosphatidylinositol 4,5-bisphosphate by PTEN to inhibit AKT activation. The nuclear p53-phosphoinositide signalosome is distinct from the canonical membrane-localized pathway and insensitive to PI3K inhibitors currently in the clinic, which underscores its therapeutic relevance.

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  • Under genotoxic stress, IPMK-generated nuclear PIP3 binds to p53, which activates nuclear AKT signaling and suppresses apoptosis.

    “While years of research have primarily investigated AKT signaling at the cell membrane, recent works by Chen et al. [71] and Choi et al. [61] have revealed that, under genotoxic stress, IPMK-generated nuclear PIP3 binds to p53, which activates nuclear AKT signaling and suppresses apoptosis.”

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Authors
Chen, M., Choi, S., Wen, T., Chen, C., Thapa, N., Lee, J. H., Cryns, V. L., & Anderson, R. A.
Affiliations
University of Wisconsin–Madison (US)
Corresponding author
  • Cryns, Vincent L.
  • Anderson, Richard A.
Venue
Nature Cell Biology
Published
2022-07
Volume
24
Issue
7
Pages
1099-1113
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W4284709570
Cited by
117
References
73
Citations by year
2026: 20 · 2025: 44 · 2024: 27 · 2023: 18 · 2022: 7
FWCI
7.84
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
U.S. Department of Defense (W81XWH-17-1-025, W81XWH-17-1-0259)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Oncology › Cancer-related Molecular Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › FOXO transcription factor regulation
Keywords
p53, PI3K/Akt signaling, phosphatidylinositol 3,4,5-trisphosphate, phosphatidylinositol 4,5-bisphosphate, PTEN, PDK1, mTORC2, genotoxic stress, DNA damage-induced apoptosis, tumour suppressor
MeSH terms
Cell Nucleus, Phosphatidylinositols, Tumor Suppressor Protein p53, Phosphatidylinositol 3-Kinases, Proto-Oncogene Proteins c-akt

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