Efficient and selective tumor cell lysis and induction of apoptosis in melanoma cells by a conditional replication-competent CD95L adenovirus

Exp Dermatol. 2010 Aug;19(8):e56-66. doi: 10.1111/j.1600-0625.2009.00977.x.

Abstract

The high mortality of melanoma demands the development of new strategies, and gene therapy may be considered provided improvements in efficacy and selectivity. Overexpression of the death ligand CD95L/FasL has been shown in previous studies as highly effective for apoptosis induction in melanoma cells. For efficient and selective targeting of melanoma, a conditional replication-competent adenoviral vector was constructed (Ad5-FFE-02), which drives CD95L expression by a tetracycline-inducible promoter. For restricting its replication to melanoma cells, the adenoviral E1A gene is controlled by a tyrosinase-derived promoter. Furthermore, adenoviral E1B was deleted and a mutated E1A was used to preferentially support replication in tumor cells. Proving its high selectivity and efficiency, strong expression of E1A and doxycycline-dependent induction of CD95L were characteristic for tyrosinase-positive melanoma cells after Ad5-FFE-02 transduction, whereas absent in non-melanoma cell lines. Importantly, Ad5-FFE-02-mediated cell lysis was restricted to melanoma cells, and induction of apoptosis was found only in tyrosinase and CD95 expressing cells. Finally, the combination of adenoviral replication and CD95L-mediated apoptosis resulted in an enhanced repression of melanoma cell growth. This new adenoviral vector may provide a basis for an efficient targeting of melanoma.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenoviridae / genetics*
  • Adenoviridae / physiology
  • Adenovirus E1A Proteins / metabolism
  • Apoptosis*
  • Cell Line, Tumor
  • Doxycycline / pharmacology
  • Fas Ligand Protein / genetics*
  • Fas Ligand Protein / metabolism
  • Gene Expression Regulation, Neoplastic / drug effects
  • Gene Expression Regulation, Viral / drug effects
  • Genetic Therapy*
  • Genetic Vectors
  • Humans
  • Melanoma / metabolism
  • Melanoma / pathology
  • Melanoma / therapy*
  • Plasmids
  • Skin Neoplasms / metabolism
  • Skin Neoplasms / pathology
  • Skin Neoplasms / therapy*
  • Virus Replication / physiology*

Substances

  • Adenovirus E1A Proteins
  • Fas Ligand Protein
  • Doxycycline