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SGK1 Is a Critical Component of an AKT-Independent Pathway Essential for PI3K-Mediated Tumor Development and

Arturo Orlacchio1, Michela Ranieri1, Martina Brave1

  • 1Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, New York.

Cancer Research
|October 22, 2017
PubMed

Insights

AKT activation is necessary but not sufficient for PI3K-driven cancer transformation. The study highlights the essential role of SGK1 in thyroid cancer cell proliferation and survival, suggesting combined targeting of SGK1 and AKT for enhanced therapeutic effects.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Phosphoinositide 3-kinase (PI3K)-AKT signaling is crucial in cancer development.
  • AKT activation is a frequent event in malignant transformation.

Purpose of the Study:

  • To investigate the role of AKT activation in PI3K-driven transformation.
  • To identify key kinases required for transformation beyond AKT.
  • To evaluate therapeutic strategies targeting PI3K-AKT pathway components.

Main Methods:

  • Utilized thyroid gland epithelial cells and genetically engineered mouse models.
  • Investigated the necessity and sufficiency of AKT activation for transformation.
  • Assessed the role of PDK1-regulated AGC kinases, specifically SGK1.
  • Evaluated the efficacy of cotargeting SGK1 and AKT.

Main Results:

  • AKT activation alone is insufficient for PI3K-driven transformation.
  • Transformation necessitates the activity of PDK1-regulated AGC kinases.
  • SGK1 is essential for proliferation and survival in thyroid cancer cells with PI3K mutations.
  • Cotargeting SGK1 and AKT significantly suppressed tumor growth more than targeting PI3K or AKT alone.

Conclusions:

  • AKT-independent pathways are clinically relevant in PI3K-driven tumors.
  • SGK1 is a critical mediator of PI3K-driven transformation.
  • Targeting SGK1, in addition to AKT, represents a promising therapeutic strategy for cancers with PI3K pathway activation.

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