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Bacterial deoxyribonucleoside kinases are poor suicide genes in mammalian cells

Claire Hébrard1, Emeline Cros-Perrial, Anders Ranegaard Clausen

  • 1INSERM U590, Laboratoire de Cytologie Analytique, Faculte de Medecine Rockefeller, Universite Claude Bernard Lyon I, Lyon, France.

Nucleosides, Nucleotides & Nucleic Acids
|February 26, 2010
PubMed

Insights

Bacterial deoxyribonucleoside kinases (dNKs) were investigated for sensitizing human cancer cells to gemcitabine. Results showed bacterial dNKs were poorly active in human cells, limiting their therapeutic potential.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Deoxyribonucleoside kinases (dNKs) are crucial enzymes in nucleoside metabolism.
  • Transferring dNKs into cancer cells can enhance the efficacy of nucleoside analogue drugs.
  • Bacterial dNKs have shown potential in sensitizing bacteria to nucleoside analogues.

Purpose of the Study:

  • To evaluate the potential of bacterial deoxyadenosine kinases (dAKs) for sensitizing human cancer cells to gemcitabine.
  • To assess the expression and activity of bacterial dNKs in mammalian cells.

Main Methods:

  • Stable and transient transfection of human cells with bacterial dNK genes.
  • Assay of dNK activity in transfected mammalian cells.
  • Fusion of Bacillus cereus dAK with green fluorescent protein (GFP).

Main Results:

  • Bacterial dNKs exhibited significantly lower activity in human cells compared to human and fruitfly dNKs.
  • Fusion of bacterial dAK with GFP resulted in only modest sensitization of cancer cells to gemcitabine.
  • Bacterial dNKs appeared to be poorly expressed or unstable in the mammalian cell environment.

Conclusions:

  • Bacterial dNKs are not efficiently expressed or are unstable in human cancer cells.
  • The limited activity of bacterial dNKs in mammalian cells restricts their use for sensitizing cancer cells to gemcitabine.
  • Further research is needed to overcome expression and stability issues for potential therapeutic applications.

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