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Digestive Diseases and Sciences

, Volume 60, Issue 12, pp 3681–3690 | Cite as

MTBP Promotes the Invasion and Metastasis of Hepatocellular Carcinoma by Enhancing the MDM2-Mediated Degradation of E-Cadherin

  • Shan Lu
  • Wei Zhou
  • Haiyun Wei
  • Leifeng He
  • Liang Li
Original Article

Abstract

Background

Emerging evidence suggests that MTBP plays a role in cancer development and possibly progression, but its influence on hepatocellular carcinoma (HCC) remains unclear.

Methods

We used real-time PCR and Western blotting to investigate MTBP expression in four HCC cell lines, 120 pairs of tumor and corresponding paracarcinomatous tissues from HCC patients. Immunohistochemistry was performed to examine MTBP expression in HCC and corresponding paracarcinomatous tissues from 120 patients. E-cadherin was only examined in HCC tissues of patients mentioned above. Statistical analyses were applied to evaluate the prognostic value and associations of MTBP expression with clinical parameters. Furthermore, the MTBP gene was overexpressed in HepG2 cell and silenced by siRNA in Hu7 cell, and cell migration and invasion were detected in vitro and in vivo. Moreover, the molecular mechanism of E-cadherin regulation by MTBP was explored.

Results

In this study, we first showed that MTBP protein expression is positively correlated with distant metastasis and poor prognosis in HCC patients. We also found that MTBP expression was increased in metastatic cell lines when compared with nonmetastatic cell lines. Consistent with these findings, enhanced expression of MTBP promoted HCC cell invasiveness and metastasis both in vitro and in vivo, whereas the knockdown of MTBP with small interfering RNA resulted in reduced HCC migration and invasion. Ectopic expression of MTBP in HCC cells induced epithelial-to-mesenchymal transition, whereas the silencing of MTBP had the opposite effect. Furthermore, our results show that MTBP and E-cadherin protein expression are inversely correlated in primary HCC tissues. Moreover, our findings indicate that MTBP overexpression decreases E-cadherin expression through the modulation of Mdm2 ubiquitination degradation.

Conclusions

Our data show that MTBP aggravates the invasion and metastasis of HCC by promoting the MDM2-mediated degradation of E-cadherin.

Keywords

Hepatocellular carcinoma MTBP Invasion E-cadherin Ubiquitination 

Notes

Acknowledgments

We thank Elsevier’s English Language Editing service for editing the manuscript. This study was supported by grants from the National Natural Science Foundation of China (No. 81360122).

Compliance with ethical standards

Conflict of interest

None.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Shan Lu
    • 1
    • 2
    • 4
  • Wei Zhou
    • 3
  • Haiyun Wei
    • 3
  • Leifeng He
    • 4
  • Liang Li
    • 4
  1. 1.Department of GastroenterologySecond Affiliated Hospital of Nanchang UniversityNanchangChina
  2. 2.Department of OncologyJiangxi Provincial Cancer HospitalNanchangChina
  3. 3.Department of Gastrointestinal SurgeryJiangxi Provincial Cancer HospitalNanchangChina
  4. 4.Jiangxi Province Key Laboratory of Molecular MedicineNanchangChina

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