MicroRNA200a enhances antitumor effects in combination with doxorubicin in hepatocellular carcinoma
Xiao Cui1, Dachen Zhou2, Qiang Du3
1Department of Surgery, The Second Hospital of Anhui Medical University, Hefei, Anhui, China; Department of Surgery, University of Pittsburgh, Pittsburgh, USA.
Abstract:
Hepatocellular carcinoma (HCC) is often treated with doxorubicin. MicroRNAs have been shown to have important regulatory roles in cancer and serve as a target in chemoresistance. In this study, we investigated the effects of specific microRNA-200a (miR-200a) on HCC tumor cell growth and effect of doxorubicin-mediated cytotoxicity. Our results show miR-200a is downregulated in human HCC and HCC tumor cell lines. Increasing miR-200a expression inhibited HCC growth and synergized with the antitumor effects of doxorubicin. Inhibiting endogenous miR-200a promoted tumor growth and chemotherapeutic resistance. Increasing miR-200a expression inhibited tumor metabolism (ATP production, mitochondrial respiration, glycolysis), while inhibition of endogenous miR-200a reversed these effects. MiR-200a expression also increased autophagy and synergized with doxorubicin-mediated cytotoxicity. This study identifies a novel role of miR-200a in potentiating doxorubicin-mediated therapeutic effects in HCC.
Insights
MicroRNA-200a (miR-200a) is downregulated in hepatocellular carcinoma (HCC). Restoring miR-200a inhibits HCC growth and enhances doxorubicin chemotherapy effectiveness by impacting tumor metabolism and increasing autophagy.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Hepatocellular carcinoma (HCC) is a primary liver cancer with limited treatment options.
- Doxorubicin is a common chemotherapeutic agent for HCC, but chemoresistance is a significant challenge.
- MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression and play critical roles in cancer development and chemoresistance.
Purpose of the Study:
- To investigate the role of microRNA-200a (miR-200a) in hepatocellular carcinoma (HCC) progression.
- To determine the effect of miR-200a on HCC cell growth and sensitivity to doxorubicin.
- To elucidate the impact of miR-200a on tumor cell metabolism and autophagy in HCC.
Main Methods:
- Quantitative real-time PCR to assess miR-200a expression levels in human HCC tissues and cell lines.
- In vitro cell culture experiments to manipulate miR-200a expression (overexpression and inhibition).
- Assessment of HCC cell viability, proliferation, ATP production, mitochondrial respiration, glycolysis, and autophagy.
Main Results:
- miR-200a was found to be significantly downregulated in human HCC tissues and cell lines.
- Overexpression of miR-200a inhibited HCC cell growth, proliferation, and key metabolic pathways (ATP production, mitochondrial respiration, glycolysis).
- Restoring miR-200a expression sensitized HCC cells to doxorubicin, enhanced autophagy, and reversed chemoresistance.
Conclusions:
- miR-200a acts as a tumor suppressor in HCC by inhibiting cell growth and metabolic activity.
- miR-200a potentiates the cytotoxic effects of doxorubicin in HCC, suggesting its therapeutic potential.
- Modulating miR-200a levels could be a novel strategy to overcome doxorubicin resistance in hepatocellular carcinoma.
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