Annals of Surgical Oncology

, Volume 20, Supplement 3, pp 625–635

miR-675 Mediates Downregulation of Twist1 and Rb in AFP-Secreting Hepatocellular Carcinoma

Authors

  • J. M. Hernandez
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
  • A. Elahi
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
  • C. W. Clark
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
  • J. Wang
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
  • L. A. Humphries
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
  • B. Centeno
    • Department of Anatomic PathologyH. Lee Moffitt Cancer Center and Research Institute
  • G. Bloom
    • Department of Biomedical InformaticsH. Lee Moffitt Cancer Center and Research Institute
  • B. C. Fuchs
    • Division of Surgical OncologyMassachusetts General Hospital Cancer Center
    • Division of Surgical OncologyHarvard Medical School
  • T. Yeatman
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
    • Department of Gastrointestinal OncologyH. Lee Moffitt Cancer Center and Research Institute
Translational Research and Biomarkers

DOI: 10.1245/s10434-013-3106-3

Cite this article as:
Hernandez, J.M., Elahi, A., Clark, C.W. et al. Ann Surg Oncol (2013) 20: 625. doi:10.1245/s10434-013-3106-3

Abstract

Background

Alpha-fetoprotein (AFP)-secreting hepatocellular carcinomas (HCC) represent a genetically distinct subset of tumors often associated with a worse prognosis. However, the molecular mechanisms that underlie these phenotypic differences remain poorly understood.

Methods

HCC tumor samples from 27 patients were profiled using the Affymetrix 133 Plus 2.0 GeneChips. GeneGO Metacore software was used to identify altered biologic pathways. Expression validation was confirmed by RT-PCR. Manipulation of miR-675 by overexpression and antagomir-mediated knockdown was carried out with subsequent evaluation of effects on cell behavior by cell cycle, proliferation, invasion, and growth in soft agar assays.

Results

We identified a strong relationship between primary tumor H19 gene expression and elevated serum AFP. H19 has recently been identified to encode microRNA-675 (miR-675), and we confirmed the relationship in an independent sample of patients. Pathway analyses of the effect of miR-675 overexpression in hepatoma cells revealed a predominant upregulation of cell adhesion and cell cycle initiation pathways. We have demonstrated that miR-675 mediates increases in proliferation and an accumulation of cells with tetraploid DNA content associated with a repression of Rb. We also demonstrated that overexpression of miR-675 alters cellular morphology, reduces invasive potential, and increases anchorage-independent growth capacity. These findings are consistent with a mesenchymal-to-epithelial transition, associated with a reduction in the expression of the key EMT mediator, Twist1.

Conclusions

Expression of the miR-675 in hepatocellular carcinoma links a dramatic upregulation of proliferative and growth capacity with inhibition of motility in HCC cells.

Supplementary material

10434_2013_3106_MOESM1_ESM.docx (25 kb)
Supplementary material 1 (DOCX 24 kb)
10434_2013_3106_MOESM2_ESM.jpg (1.2 mb)
Supplemental Fig. 1 Kaplan–Meier survival curves for AFP-secreting and non-AFP-secreting HCC. Note: four patients were lost to follow-up and therefore were not included in the analysis. (JPEG 1238 kb)

Copyright information

© Society of Surgical Oncology 2013