Cited by 98Mitochondrial Function and PathologyMetabolism, Diabetes, and CancerPI3K/AKT/mTOR signaling in cancer

PTEN/Akt Signaling Controls Mitochondrial Respiratory Capacity through 4E-BP1

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Goo, Chong Kiat, Lim, Hwee Ying, Ho, Qin Shi, Too, Heng-Phon, Clement, Marie-Veronique, Wong, Kim Ping·2012·PLoS ONE

Abstract

Akt, a serine/threonine kinase has been shown to stimulate glycolysis in cancer cells but its role in mitochondrial respiration is unknown. Using PTEN-knockout mouse embryonic fibroblasts (MEF(PTEN-/-)) with hyper-activated Akt as a cell model, we observed a higher respiratory capacity in MEF(PTEN-/-) compared to the wildtype (MEF(WT)). The respiratory phenotype observed in MEF(PTEN-/-) was reproduced in MEF(WT) by gene silencing of PTEN which substantiated its role in regulating mitochondrial function. The increased activities of the respiratory complexes (RCs) I, III and IV were retained in the same relative proportions as those present in MEF(WT), alluding to a possible co-ordinated regulation by PTEN/Akt. Using LY294002 (a PI3K inhibitor) and Akt inhibitor IV, we showed that the regulation of enzyme activities and protein expressions of the RCs was dependent on PI3K/Akt. There was insignificant difference in the protein expressions of mitochondrial transcription factor: peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) and its downstream targets, the nuclear respiratory factor 1 (NRF-1) and mitochondrial transcription factor A (mtTFA) between MEF(PTEN-/-) and MEF(WT). Similarly, mRNA levels of the same subunits of the RCs detected in Western blots were not significantly different between MEF(PTEN-/-) and MEF(WT) suggesting that the regulation by Akt on mitochondrial function was probably not via gene transcription. On the other hand, a decrease of total 4E-BP1 with a higher expression of its phosphorylated form relative to total 4E-BP1 was found in MEF(PTEN-/-), which inferred that the regulation of mitochondrial respiratory activities by Akt was in part through this protein translation pathway. Notably, gene silencing of 4E-BP1 up-regulated the protein expressions of all RCs and the action of 4E-BP1 appeared to be specific to these mitochondrial proteins. In conclusion, PTEN inactivation bestowed a bioenergetic advantage to the cells by up-regulating mitochondrial respiratory capacity through the 4E-BP1-mediated protein translation pathway.

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  1. [23]Ragan CI, Wilson, M T., Darley-Usmar V.M., Lowe P.N., (1987) Chapter 4: Subfractionation of mitochondria and isolation of the proteins of oxidative phosporylation. In Mitochondria, a practical approach (Darley-Usmar, VM, Rickwood, D, Wilson, MT, ed): pp 79–112.
  2. [40]Sonenberg N (1996) Chapter 8: mRNA 5′ Cap-binding Protein eIF4E and Control of Cell Growth. In Translational Control (Hershey, John W B,Mathews, Michael,Sonenberg, Nahum, ed) Cold Spring Harbor Laboratory Press NY: pp. 245–269.

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Authors
Goo, C. K., Lim, H. Y., Ho, Q. S., Too, H.-P., Clement, M.-V., & Wong, K. P.
Affiliations
National University of Singapore (SG)
Corresponding author
Wong, Kim Ping
Venue
PLoS ONE
Published
2012-09-26
Volume
7
Issue
9
Pages
e45806
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2004075497
Cited by
97
References
51
Citations by year
2026: 3 · 2025: 4 · 2024: 8 · 2023: 4 · 2022: 8 · 2021: 5 · 2020: 10 · 2019: 17 · 2018: 6 · 2017: 9 · 2016: 5 · 2015: 5 · 2014: 9 · 2013: 3 · 2012: 1
FWCI
2.32
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • National University of Singapore (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • National University of Singapore
  • Biomedical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
PTEN, Akt signaling, 4E-BP1, mitochondrial respiration, respiratory chain complexes, PI3K/Akt signaling, mRNA translation, PGC-1α, mitochondrial biogenesis, bioenergetics
MeSH terms
Adenosine Triphosphate, Animals, Cells, Cultured, Chromones, Electron Transport Complex IV, Enzyme Inhibitors, Fibroblasts, Membrane Potentials, Mice, Transgenic, Mitochondria, Morpholines, Phosphoproteins, Protein Biosynthesis, Tricarboxylic Acids, Cell Cycle Proteins, Gene Silencing, Adaptor Proteins, Signal Transducing, Proto-Oncogene Proteins c-akt, PTEN Phosphohydrolase, Mice

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