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A Three-Dimensional Spheroid Model to Investigate the Tumor-Stromal Interaction in Hepatocellular Carcinoma
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RalA signaling pathway as a therapeutic target in hepatocellular carcinoma (HCC)

Mohamad Ezzeldin1, Emma Borrego-Diaz1, Mohammad Taha1

  • 1The University of Kansas Medical School, Divisions of Gastroenterology, Hepatology and Motility and Hematology/Oncology, Molecular Medicine Laboratory, Kansas City, KS, USA.

Molecular Oncology
|May 3, 2014
PubMed

Insights

RalA overactivation drives hepatocellular carcinoma (HCC) progression. Inhibiting RalA or its related pathways significantly reduces HCC cell viability, invasiveness, and tumorigenesis, suggesting RalA as a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Ral (Ras like) proteins are key components of proto-oncogenic signaling pathways downstream of Ras.
  • Aberrant signaling in these pathways contributes to cancer development and progression.

Purpose of the Study:

  • To investigate the role of RalA signaling in hepatocellular carcinoma (HCC).
  • To evaluate RalA as a potential therapeutic target for HCC treatment.

Main Methods:

  • Analysis of RalA pathway component expression in HCC tissues and cells.
  • Gene-specific silencing of RalA.
  • Pharmacological inhibition of RalA activation (using GGTI) and Aurora kinase.
  • Assessment of HCC stem cell markers (CD133).
  • Evaluation in transgenic (FXR-Knockout) and subcutaneous mouse models of HCC.

Main Results:

  • RalA was significantly overactivated in HCC cells and tissues compared to non-malignant samples.
  • RalBP1 and RalGDS expression were elevated in malignant samples.
  • Inhibition of RalA reduced HCC cell viability and invasiveness.
  • Inhibitors of Ral activation (GGTI) and Aurora kinase decreased HCC cell proliferation.
  • Elevated RalA activation was observed in CD133+ HCC stem cells.
  • RalA-GTP levels were higher in liver tumors of a transgenic HCC mouse model.
  • Inhibition of the aurora kinase/RalA pathway reduced HCC tumorigenesis in vivo.

Conclusions:

  • RalA overactivation is a critical factor in the malignant phenotype of both differentiated and stem cells in HCC.
  • Targeting the RalA pathway, including Aurora kinase, offers a promising therapeutic strategy for HCC.
Keywords:
Aurora kinaseCancer stem cellsFXRHCCRalRalBP1SignalingTreatment

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