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Clinical and Experimental Medicine

, Volume 15, Issue 4, pp 469–475 | Cite as

Epidermal growth factor receptor-coamplified and overexpressed protein (VOPP1) is a putative oncogene in gastric cancer

  • Caiping Gao
  • Minghui Pang
  • Zhou Zhou
  • Size Long
  • Dandan Dong
  • Jiyun Yang
  • Mei Cao
  • Chumin Zhang
  • Shengxi Han
  • Liangping LiEmail author
Original Article

Abstract

MicroRNAs are found to play an important role in gastric cancer. Reduced expression of microRNA-218 (miR-218) is of key interest. The target gene of microRNA-218, epidermal growth factor receptor-coamplified and overexpressed protein (ECOP) encoded by the VOPP1 gene, has been implicated in tumorigenesis. However, few studies on expression and function of ECOP in gastric cancer have been reported. ECOP expression was determined in matched normal and gastric adenocarcinoma tissue specimens by immunohistochemistry and western blot. Subsequently, ectopic overexpression and RNAi-mediated silencing of VOPP1 was effected in the human gastric cancer cell line, AGS. Proliferation and migration of parental, VOPP1 overexpressing and VOPP1-silenced AGS cells were evaluated by cell proliferation assay and scratch wound-healing motility assay. Finally, intracellular localization of ECOP in AGS cells was assessed by green fluorescent protein tagging and fluorescent microscopy. Western blot and immunohistochemistry showed overexpression of ECOP in gastric adenocarcinoma tissues compared to matched normal tissue specimens. Ectopic overexpression and RNAi-mediated silencing of VOPP1 promoted and inhibited, respectively, cell proliferation and migration in AGS cells. Intracellular localization of ECOP in perinuclear lysosomes mimicked colocalization earlier reported for other cancerous cells. VOPP1 is overexpressed in gastric adenocarcinoma, which is involved in promoting cell proliferation and migration and thus might serve as a putative oncogene.

Keywords

ECOP Gastric cancer Lysosomes Migration Proliferation 

Notes

Acknowledgments

We thank Dr. Zhenglin Yang (Center for Human Molecular Biology and Genetics, The Institute of Laboratory Medicine, Sichuan Academy of Medical Sciences and Sichuan Provincial People’s Hospital) and Prof. Yan Peng (Department of Gastroenterology, Luzhou Medical College) for their excellent technical assistance.

Conflict of interest

None.

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Copyright information

© Springer-Verlag Italia 2014

Authors and Affiliations

  • Caiping Gao
    • 1
  • Minghui Pang
    • 2
  • Zhou Zhou
    • 1
  • Size Long
    • 1
  • Dandan Dong
    • 3
  • Jiyun Yang
    • 4
  • Mei Cao
    • 5
  • Chumin Zhang
    • 1
  • Shengxi Han
    • 1
  • Liangping Li
    • 1
    Email author
  1. 1.Department of GastroenterologySichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina
  2. 2.Department of Gastrointestinal SurgerySichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina
  3. 3.Department of PathologySichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina
  4. 4.Center for Human Molecular Biology and Genetics, The Institute of Laboratory MedicineSichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina
  5. 5.CentralabSichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalChengduChina

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