Article Text

This article has a correction. Please see:

PDF
Potent inhibition of human gastric cancer by HER2-directed induction of apoptosis with anti-HER2 antibody and caspase-3 fusion protein
  1. De-Xin Zhang1,
  2. Peng-Tao Zhao1,2,
  3. Lin Xia1,
  4. Li-Li Liu1,2,
  5. Jie Liang1,
  6. Hui-Hong Zhai1,
  7. Hong-Bo Zhang1,
  8. Xue-Gang Guo1,
  9. Kai-Chun Wu1,
  10. Yan-Ming Xu3,
  11. Lin-Tao Jia3,
  12. An-Gang Yang3,
  13. Si-Yi Chen4,
  14. Dai-Ming Fan1
  1. 1State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Disease, Fourth Military Medical University, Xi'an, P.R. China
  2. 2Department of Pathology and Pathophysiology, Fourth Military Medical University, Xi'an, P.R. China
  3. 3State Key Laboratory of Cancer Biology & Department of Immunology, Fourth Military Medical University, Xi'an, P.R. China
  4. 4Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas, USA
  1. Correspondence to Dr Dai-Ming Fan, State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Disease, the Fourth Military Medical University, 15 West Chang-Le Road, Xi'an 710032, P.R. China; fandaim{at}fmmu.edu.cn

Abstract

Background and aims HER2, an oncogene, has been found to be over-expressed in 10–40% of human gastric carcinomas. The aims of this study were to investigate if a fusion protein consisting of anti-HER2 sFv and constitutively active caspase-3 was capable of inducing apoptosis in HER2-expressing human gastric cancer cells and blocking the growth of human gastric cancer xenografts in nude mice.

Methods NIH3T3 cells stably transduced with the pcDNA3.1-HER-PE-CP3 recombinant plasmid containing a secretion signal, a single-chain anti-HER2 monoclonal antibody fragment, a Pseudomonas exotoxin A translocation domain and a constitutively active caspase-3 molecule were used to induce apoptosis in human gastric cancer cells both in vitro and in vivo. Immunofluorescence staining and western blotting were used to examine the expression of the recombinant protein HER-PE-CP3. Apoptosis was determined by flow cytometry and TUNEL assay.

Results Co-cultivation of HER-PE-CP3/ NIH3T3 with human gastric cancer cells led to internalisation of HER-PE-CP3 and apoptosis in HER2-expressing human gastric cancer cells but not in HER2-negative cancer cells. Inoculation of HER-PE-CP3/NIH3T3 in nude mice resulted in potent inhibition of human gastric cancer xenografts and much prolonged survival time of the tumour-bearing mice compared with the control. Significantly more apoptotic cells were detected in xenografts in mice receiving HER-PE-CP3/NIH3T3 than in control mice.

Conclusions The HER-PE-CP3 chimeric molecule could induce selective apoptosis and potent growth inhibition of HER2-positive human gastric cancer cells and might represent a novel HER2-directed treatment option for human gastric cancer.

  • Gastric cancer
  • HER2
  • antibody-targeted therapy
  • apoptosis
  • tumour markers
  • caspase-3
  • single-chain monoclonal antibody

Statistics from Altmetric.com

Footnotes

  • D-X Z and P-T Z contributed equally to this paper.

  • Funding This paper is partially sponsored by a grant (number 30371337) from the National Natural Science Foundation of China to Dr De-Xin Zhang.

  • Competing interests None.

  • Ethics approval All animals used in this study were housed, cared for and used in accordance with the institutional guidelines for the care and use of laboratory animals. Approval was given by Xijing Hospital on the 20 December 2005.

  • Provenance and peer review Not commissioned; externally peer reviewed.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

Linked Articles

  • Digest
    Emad El-Omar Severine Vermeire Alexander Gerbes
  • Correction
    BMJ Publishing Group Ltd and British Society of Gastroenterology