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Position Is Destiny: Metabolism and Cell Identity

Wolfram Goessling1

  • 1Division of Gastroenterology, Massachusetts General Hospital, Boston, MA 02114, USA; Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA 02139, USA; Genetics Division, Brigham and Women's Hospital, Boston, MA 02115, USA; Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute and Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.

Cell Metabolism
|May 9, 2019
PubMed

Insights

Activating mutations in CTNNB1 (encoding β-catenin) drive hepatocellular carcinoma by increasing glutamine production. This study reveals WNT/β-catenin signaling directly targets mTOR, impacting liver cancer growth.

Area of Science:

  • Hepatocellular Carcinoma Research
  • Molecular Biology
  • Cancer Signaling Pathways

Background:

  • Hepatocellular carcinoma (HCC) frequently harbors mutations in CTNNB1, which encodes β-catenin.
  • Activating CTNNB1 mutations correlate with elevated glutamine synthetase expression in HCC.
  • β-catenin is a key effector in the WNT signaling pathway, crucial for liver development and cancer.

Purpose of the Study:

  • To investigate the direct molecular targets of WNT/β-catenin signaling in hepatocellular carcinoma.
  • To elucidate the role of glutamine metabolism in the carcinogenic effects of WNT/β-catenin.
  • To identify novel therapeutic targets for HCC driven by CTNNB1 mutations.

Main Methods:

  • Analysis of gene expression data from HCC patients.
  • Western blot analysis to detect protein expression levels.
  • Cell-based assays to study WNT/β-catenin signaling and glutamine metabolism.

Main Results:

  • WNT/β-catenin signaling directly upregulates the expression of mTOR.
  • Increased glutamine production is a downstream effect of WNT/β-catenin activation.
  • Glutamine is essential for the pro-carcinogenic activity of WNT/β-catenin in liver cells.

Conclusions:

  • mTOR is identified as a direct target of WNT/β-catenin signaling in HCC.
  • Targeting glutamine metabolism presents a potential therapeutic strategy for CTNNB1-mutated HCC.
  • Understanding this pathway provides insights into liver cancer progression and treatment.

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