Oncolytic adenovirus-mediated shRNA against Apollon inhibits tumor cell growth and enhances antitumor effect of 5-fluorouracil

Gene Ther. 2008 Apr;15(7):484-94. doi: 10.1038/gt.2008.6. Epub 2008 Jan 31.


Apollon, a membrane-associated inhibitor of apoptosis protein, protects cells against apoptosis and is upregulated in certain tumor cells. In this study, the effects of Apollon protein knockdown by RNA interference on the growth of human HeLa, HT-1080 and MCF-7 cells in vitro and in vivo were investigated. An oncolytic adenovirus (ZD55) containing the RNA polymerase III-dependent U6 promoter to express short hairpin RNA (shRNA) directed against Apollon (ZD55-siApollon) was constructed. Our data show that ZD55-siApollon successfully exerts a gene knockdown effect and causes the inhibition of tumor cell growth both in culture and in athymic mice in vivo. Cell cycle analysis, 4',6-diamidino-2-phenylindole staining and western blot analysis reveal that ZD55-siApollon-mediated suppression of Apollon induces apoptosis. Intratumoral injection of ZD55-siApollon significantly inhibits tumor growth in HT-1080 xenograft mice. Furthermore, ZD55-siApollon enhances the antitumor effect of 5-fluorouracil, a chemotherapeutic agent. In conclusion, these results suggest that the depletion of Apollon by oncolytic adenovirus-shRNA delivery system provides a promising method for cancer therapy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenoviridae / genetics*
  • Animals
  • Antineoplastic Agents / therapeutic use
  • Apoptosis / genetics
  • Cell Line, Tumor
  • Combined Modality Therapy
  • Fluorouracil / therapeutic use
  • Gene Deletion
  • Genetic Engineering
  • Genetic Therapy / methods*
  • HeLa Cells
  • Humans
  • Inhibitor of Apoptosis Proteins / genetics*
  • Mice
  • Mice, Nude
  • Neoplasms / drug therapy
  • Neoplasms / pathology
  • Neoplasms / therapy*
  • Oncolytic Virotherapy / methods*
  • RNA Interference*
  • RNA, Small Interfering / administration & dosage
  • Transfection / methods
  • Xenograft Model Antitumor Assays


  • Antineoplastic Agents
  • BIRC6 protein, human
  • Inhibitor of Apoptosis Proteins
  • RNA, Small Interfering
  • Fluorouracil