Abstract
Background
Reports show miR-23b to be a cancer-related biomarker in various cancer types. Interestingly, it has a dual role of oncogenic and tumor-suppressive functions, depending on the cancer type. This study focused on the unknown association of miR-23b-3p with hepatocellular carcinoma (HCC).
Methods
Expression of miR-23b-3p was measured in nine HCC cell lines and 125 resected human HCC samples by TaqMan microRNA assays. To detect its downstream target, miR-23b-3p mimic and inhibitor constructs were transfected and analyzed.
Results
HepG2, a high miR-23b-3p-expressing cell line, was transfected with a miR-23b-3p inhibitor construct, whereas SK-Hep1, a low miR-23b-3p-expressing cell line, was transfected with a mimic construct. Proliferation of HCC cells was activated by miR-23b-3p overexpression and diminished by its knockdown. Then, 125 clinical HCC samples were examined to measure miR-23b-3p expression. Tumor expression of miR-23b-3p was upregulated in 48 cases (38%) and downregulated in 77 cases (62%). The upregulated cases were correlated with elderly patients (P = 0.015). These patients also showed significantly poor overall survival [hazard ratio (HR), 3.10; 95% conflidence interval (CI), 1.57–6.29; P = 0.001] in a multivariate analysis. Furthermore, mitochondrial metabolism-related genes (MICU3 and AUH) were detected as specific binding targets.
Conclusion
The study showed that miR-23b-3p functions as an oncogenic microRNA in HCC cell lines. Its overexpression in resected HCC tissues was a significant prognostic factor of overall survival. Both MICU3 and AUH may be candidate gene targets of miR-23b-3p.
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Acknowledgements
We thank H. Nikki March, PhD, from the Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript. We also thank Dr. Mikako Ito in Nagoya University for use of the Extracellular flux analyzer system (Agilent, Santa Clara, CA, USA).
Funding
This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant-in-Aid for Scientific Research (C) Nos. JP15H06281 and JP19K18143.
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Hayashi, M., Yamada, S., Kurimoto, K. et al. miR-23b-3p Plays an Oncogenic Role in Hepatocellular Carcinoma. Ann Surg Oncol 28, 3416–3426 (2021). https://doi.org/10.1245/s10434-020-09283-y
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DOI: https://doi.org/10.1245/s10434-020-09283-y