Cited by 674PI3K/AKT/mTOR signaling in cancerMetabolism, Diabetes, and CancerProtein Kinase Regulation and GTPase Signaling

The PTEN/MMAC1 tumor suppressor phosphatase functions as a negative regulator of the phosphoinositide 3-kinase/Akt pathway

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Wu, Xinyi, Senechal, Kristen, Neshat, Mehran S., Whang, Young E., Sawyers, Charles L.·1998·Proceedings of the National Academy of Sciences

Abstract

The PTEN/MMAC1 phosphatase is a tumor suppressor gene implicated in a wide range of human cancers. Here we provide biochemical and functional evidence that PTEN/MMAC1 acts a negative regulator of the phosphoinositide 3-kinase (PI3-kinase)/Akt pathway. PTEN/MMAC1 impairs activation of endogenous Akt in cells and inhibits phosphorylation of 4E-BP1, a downstream target of the PI3-kinase/Akt pathway involved in protein translation, whereas a catalytically inactive, dominant negative PTEN/MMAC1 mutant enhances 4E-BP1 phosphorylation. In addition, PTEN/MMAC1 represses gene expression in a manner that is rescued by Akt but not PI3-kinase. Finally, higher levels of Akt activation are observed in human prostate cancer cell lines and xenografts lacking PTEN/MMAC1 expression when compared with PTEN/MMAC1-positive prostate tumors or normal prostate tissue. Because constitutive activation of either PI3-kinase or Akt is known to induce cellular transformation, an increase in the activation of this pathway caused by mutations in PTEN/MMAC1 provides a potential mechanism for its tumor suppressor function.

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Crossref · 10.1073/pnas.95.26.15587

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Authors
Wu, X., Senechal, K., Neshat, M. S., Whang, Y. E., & Sawyers, C. L.
Affiliations
University of North Carolina at Chapel Hill (US)
Corresponding author
Sawyers, Charles L.
Venue
Proceedings of the National Academy of Sciences
Published
1998-12-22
Volume
95
Issue
26
Pages
15587-15591
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2111752734
Cited by
674
References
56
Citations by year
2026: 3 · 2025: 4 · 2024: 12 · 2023: 2 · 2022: 7 · 2021: 9 · 2020: 7 · 2019: 7 · 2018: 7 · 2017: 11 · 2016: 21 · 2015: 21 · 2014: 24 · 2013: 27 · 2012: 29
FWCI
14.89
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Carolina Digital Repository (University of North Carolina at Chapel Hill) (submittedVersion)
  • UNC Libraries
Funders
  • American Society of Hematology
  • National Institutes of Health (5r01dk052673-04, CA32737)
  • National Cancer Institute (CA32737, P01CA032737)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK52673)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
Keywords
PTEN/MMAC1, tumor suppressor phosphatase, phosphoinositide 3-kinase/Akt pathway, Akt activation, 4E-BP1 phosphorylation, translational regulation, gene expression inhibition, prostate cancer, PTEN mutation, cell transformation
MeSH terms
Animals, Cell Line, Humans, Male, Phosphoric Monoester Hydrolases, Prostatic Neoplasms, Proto-Oncogene Proteins, Recombinant Proteins, Transfection, Transplantation, Heterologous, Signal Transduction, Gene Expression Regulation, Neoplastic, Polymerase Chain Reaction, Genes, Tumor Suppressor, Mice, SCID, Protein Serine-Threonine Kinases, Phosphatidylinositol 3-Kinases, Tumor Suppressor Proteins, Proto-Oncogene Proteins c-akt, PTEN Phosphohydrolase, Mice

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