PreprintCited by 961Cell death mechanisms and regulationMitochondrial Function and PathologyMetabolism, Diabetes, and Cancer

Inhibition of early apoptotic events by Akt/PKB is dependent on the first committed step of glycolysis and mitochondrial hexokinase

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Gottlob, Kathrin, Majewski, Nathan, Kennedy, Scott, Kandel, Eugene, Robey, R. Brooks, Hay, Nissim·2001·Genes & Development

Abstract

The serine/threonine kinase Akt/PKB is a major downstream effector of growth factor-mediated cell survival. Activated Akt, like Bcl-2 and Bcl-xL, prevents closure of a PT pore component, the voltage-dependent anion channel (VDAC); intracellular acidification; mitochondrial hyperpolarization; and the decline in oxidative phosphorylation that precedes cytochrome c release. However, unlike Bcl-2 and Bcl-xL, the ability of activated Akt to preserve mitochondrial integrity, and thereby inhibit apoptosis, requires glucose availability and is coupled to its metabolism. Hexokinases are known to bind to VDAC and directly couple intramitochondrial ATP synthesis to glucose metabolism. We provide evidence that such coupling serves as a downstream effector function for Akt. First, Akt increases mitochondria-associated hexokinase activity. Second, the antiapoptotic activity of Akt requires only the first committed step of glucose metabolism catalyzed by hexokinase. Finally, ectopic hexokinase expression mimics the ability of Akt to inhibit cytochrome c release and apoptosis. We therefore propose that Akt increases coupling of glucose metabolism to oxidative phosphorylation and regulates PT pore opening via the promotion of hexokinase-VDAC interaction at the outer mitochondrial membrane.

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Authors
Gottlob, K., Majewski, N., Kennedy, S., Kandel, E., Robey, R. B., & Hay, N.
Affiliations
  • University of Illinois Chicago (US)
  • United States Department of Veterans Affairs (US)
Venue
Genes & Development
Published
2001-06-01
Volume
15
Issue
11
Pages
1406-1418
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2168330194
Cited by
961
References
52
Citations by year
2026: 15 · 2025: 22 · 2024: 25 · 2023: 24 · 2022: 32 · 2021: 35 · 2020: 32 · 2019: 41 · 2018: 36 · 2017: 36 · 2016: 44 · 2015: 44 · 2014: 45 · 2013: 51 · 2012: 55
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • American Heart Association
  • National Kidney Foundation of Illinois
  • National Institutes of Health
  • National Institute on Aging (AG 16927, R01AG016927)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • 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
Keywords
Akt, apoptosis inhibition, mitochondrial hexokinase, voltage-dependent anion channel, cytochrome c release, glycolysis, oxidative phosphorylation, mitochondrial outer membrane, glucose metabolism, cell survival signaling, mitochondrial membrane potential
MeSH terms
Animals, Cells, Cultured, Cytochrome c Group, Exoribonucleases, Glucose, Glycolysis, Hexokinase, Ion Channels, Mitochondria, Proto-Oncogene Proteins, Apoptosis, Protein Serine-Threonine Kinases, Porins, Proto-Oncogene Proteins c-bcl-2, Voltage-Dependent Anion Channels, bcl-X Protein, Proto-Oncogene Proteins c-akt, Rats

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