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Posttranslational regulation of Akt in human cancer

Chia-Hsin Chan1, Ukhyun Jo1, Abraham Kohrman1

  • 1Department of Pharmacological Sciences, Stony Brook University, Stony Brook, NY 11790 USA.

Cell & Bioscience
|October 14, 2014
PubMed

Insights

Aberrant Akt activation in cancer is driven by more than just phosphorylation. Other modifications, like K63-linked ubiquitination, are crucial for Akt signaling and offer new therapeutic targets.

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Cancer Research

Background:

  • The Akt pathway is critical for cell functions like survival and metabolism.
  • Hyperactivation of Akt signaling is common in human cancers.
  • Traditional understanding focused on PI3K-dependent phosphorylation for Akt activation.

Purpose of the Study:

  • To explore mechanisms beyond phosphorylation that cause aberrant Akt activation in cancer.
  • To investigate the role of various posttranslational modifications in Akt regulation.
  • To identify novel therapeutic strategies targeting Akt pathway dysregulation.

Main Methods:

  • Review of existing literature on Akt posttranslational modifications.
  • Analysis of studies investigating tyrosine phosphorylation, O-GlcNAcylation, ubiquitination, SUMOylation, and acetylation.
  • Focus on the role of K63-linked ubiquitination in Akt activation.

Main Results:

  • Akt hyperactivation in tumors with normal PI3K/PTEN activity is linked to multiple posttranslational modifications.
  • Tyrosine phosphorylation, O-GlcNAcylation, and lysine modifications (ubiquitination, SUMOylation, acetylation) contribute to aberrant Akt signaling.
  • K63-linked ubiquitination is essential for Akt activation by promoting membrane recruitment.

Conclusions:

  • Posttranslational modifications beyond phosphorylation play a significant role in Akt pathway dysregulation in cancer.
  • Understanding these modifications, particularly K63-linked ubiquitination, is vital for cancer research.
  • Targeting these novel regulatory mechanisms may provide new avenues for cancer therapy.
Keywords:
AktCancer therapyK63-linked ubiquitinationPosttranslational modification

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