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A "Patient-Like" Orthotopic Syngeneic Mouse Model of Hepatocellular Carcinoma Metastasis
Published on: October 24, 2015
Prolonged inhibition of hepatocellular carcinoma cell proliferation by combinatorial expression of defined
Yasuo Takashima1, Kenichi Horisawa1, Miyako Udono1
1Division of Organogenesis and Regeneration, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan.
Abstract:
Hepatocellular carcinoma (HCC) accounts for a large proportion of liver cancer cases and has an extremely poor prognosis. Therefore, novel innovative therapies for HCC are strongly desired. As gene therapy tools for HCC, 2 hepatic transcription factors (TF), HNF4A and HNF1A, have been used to suppress proliferation and to extinguish cancer-specific characteristics of target cells. However, our present data demonstrated that single transduction of HNF4A or HNF1A had only a limited effect on suppression of HCC cell proliferation. Thus, in this study, we examined whether combinations of TF could show more effective antitumor activity, and found that combinatorial transduction of 3 hepatic TF, HNF4A, HNF1A and FOXA3, suppressed HCC cell proliferation more stably than single transduction of these TF. The combinatorial transduction also suppressed cancer-specific phenotypes, such as anchorage-independent growth in culture and tumorigenicity after transplantation into mice. HCC cell lines transduced with the 3 TF did not recover their proliferative property after withdrawal of anticancer drugs, indicating that combinatorial expression of the 3 TF suppressed the growth of all cell subtypes within the HCC cell lines, including cancer stem-like cells. Transcriptome analyses revealed that the expression levels of a specific gene set involved in cell proliferation were only decreased in HCC cells overexpressing all 3 TF. Moreover, combined transduction of the 3 TF could facilitate hepatic differentiation of HCC cell lines. Our strategy for inducing stable inhibition and functional differentiation of tumor cells using a defined set of TF will become an effective therapeutic strategy for various types of cancers.
Insights
Combining three hepatic transcription factors (HNF4A, HNF1A, and FOXA3) effectively suppresses hepatocellular carcinoma (HCC) cell proliferation and promotes differentiation, offering a novel cancer therapy.
Area of Science:
- Hepatocellular carcinoma (HCC) research
- Gene therapy and cancer treatment
- Molecular oncology
Background:
- Hepatocellular carcinoma (HCC) is a leading cause of cancer death with a poor prognosis.
- Existing gene therapies using single hepatic transcription factors (TFs) like HNF4A and HNF1A show limited efficacy in HCC.
- Novel therapeutic strategies are urgently needed for effective HCC treatment.
Purpose of the Study:
- To investigate the potential of combinatorial gene therapy using hepatic TFs for HCC.
- To evaluate the combined effect of HNF4A, HNF1A, and FOXA3 on HCC cell proliferation and cancer-specific characteristics.
- To explore the impact of combined TF expression on HCC cell differentiation and tumorigenicity.
Main Methods:
- Transduction of HCC cell lines with combinations of hepatic TFs (HNF4A, HNF1A, FOXA3).
- Assessment of HCC cell proliferation, anchorage-independent growth, and tumorigenicity in vivo.
- Analysis of gene expression profiles using transcriptome analysis.
- Evaluation of hepatic differentiation markers post-transduction.
Main Results:
- Combinatorial transduction of HNF4A, HNF1A, and FOXA3 significantly suppressed HCC cell proliferation more effectively than single TF transduction.
- The combined TF approach reduced cancer-specific phenotypes, including anchorage-independent growth and in vivo tumorigenicity.
- Overexpression of the three TFs inhibited proliferation across all HCC cell subtypes, including cancer stem-like cells, and facilitated hepatic differentiation.
- Transcriptome analysis confirmed downregulation of proliferation-associated genes in HCC cells overexpressing the three TFs.
Conclusions:
- Combined delivery of HNF4A, HNF1A, and FOXA3 represents a potent gene therapy strategy for HCC.
- This combinatorial TF approach induces stable growth inhibition and promotes functional differentiation of HCC cells.
- The strategy holds promise as an effective therapeutic modality for various cancer types.
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