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Senescent hepatic stellate cells caused by deoxycholic acid modulates malignant behavior of hepatocellular carcinoma

  • Original Article – Cancer Research
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Abstract

Purpose

Deoxycholic acid (DCA), a secondary bile acid, is reportedly increased in the serum of patients with nonalcoholic steatohepatitis and animals with experimentally induced hepatocellular carcinoma (HCC), but its contribution to malignant behaviors of HCC has not been precisely clarified. This study aimed to examine the effect of DCA on hepatic stellate cells (HSCs), a major component of nonparenchymal cells in the liver, and its subsequent indirect effect on HCC cells.

Methods

LX2 cells, a human HSC line, were treated with DCA in vitro. Then, HuH7 cells, a human hepatoma cell line, were incubated in conditioned media of DCA-treated LX2 to investigate the subsequent effect focusing on malignant behaviors.

Results

DCA resulted in cellular senescence in LX2 with the decreased cell proliferation via cell cycle arrest at G0/1 phase, together with the induction of senescence-associated secretory phenotype (SASP) factors. To investigate the influence of SASP factors secreted by HSCs in response to DCA, HCC cells were treated with conditioned media that promoted cell migration and invasion via induction of epithelial mesenchymal transition. These changes were attenuated in the presence of neutralizing antibody against IL8 or TGFβ. Pathological analysis of surgical specimens from HCC patients revealed that senescent HSCs were detected in the stroma surrounding HCC.

Conclusion

Our data suggest an important role of HSC senescence caused by DCA for the malignant biological behaviors of HCC via induction of SASP factors, particularly IL8 and TGFβ.

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Acknowledgements

This work was supported in part by grants-in-aid from the Japan Society for the Promotion of Science to P.T. Nguyen, and K. Kanno. We are grateful the great support from Dr. Akihiro Kawahara and Sayaka Yonezawa for this study. The results here are in part based upon data generated by the TCGA Research Network: https://www.cancer.gov/tcga.

Funding

This work was supported in part by grants-in-aid from the Japan Society for the Promotion of Science to P.T. Nguyen and K. Kanno.

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Authors and Affiliations

Authors

Contributions

PTN, ST, NK, and KK conceived and planned the experiments. PTN and QTP carried out the experiments. MM and KA contributed to sample preparation. YK, MK, TK, TO, and MI contributed to the interpretation of the results. PTN and KK took the lead in writing the manuscript.

Corresponding author

Correspondence to Keishi Kanno.

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Conflict of interest

The authors have no additional financial interests.

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Nguyen, P.T., Kanno, K., Pham, Q.T. et al. Senescent hepatic stellate cells caused by deoxycholic acid modulates malignant behavior of hepatocellular carcinoma. J Cancer Res Clin Oncol 146, 3255–3268 (2020). https://doi.org/10.1007/s00432-020-03374-9

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  • DOI: https://doi.org/10.1007/s00432-020-03374-9

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