Abstract
Intratumoral injection of recombinant adenoviral type 5 (Ad5) vectors that carry prodrug-activating enzymes like DT-diaphorase (DTD) could be used to selectively target tumor cells for chemotherapy. To demonstrate the feasibility of this approach, Ad5 vectors were constructed, which express human DTD minigenes for both wild-type and mutant (C-to-T change in nucleotide 609 in DTD cDNA) DTD under the control of the cytomegalovirus (CMV) promoter. HT29 human colon carcinoma cells express wild-type DTD, whereas BE human colon carcinoma cells express mutant DTD, have low to undetectable DTD activity, and are 4- to 6-fold more resistant to mitomycin C (MMC) than HT29 cells. A test of the ability of Ad5 to infect these cells (using a β-galactosidase CMV-driven minigene) indicated that 90–100% of BE cells were infected at a multiplicity of infection (MOI) of 100, whereas only 15–40% of HT29 cells were infected at this MOI. Infection of BE cells in vitro with recombinant Ad5 carrying a minigene for wild-type DTD at MOIs of 3–100 resulted in a progressive increase in DTD activity and a maximal 8-fold increase in sensitivity to MMC as measured by a colony-forming assay. HT29 cells were sensitized 2- to 3-fold following treatment with Ad5.DTD at an MOI of 100. These results indicate that adenovirus-mediated gene transfer and expression of wild-type DTD can sensitize resistant tumor cells to MMC and that this therapeutic strategy may exert a significant bystander effect.
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Misra, V., Klamut, H. & Rauth, A. Expression of the prodrug-activating enzyme DT-diaphorase via Ad5 delivery to human colon carcinoma cells in vitro. Cancer Gene Ther 9, 209–217 (2002). https://doi.org/10.1038/sj.cgt.7700430
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DOI: https://doi.org/10.1038/sj.cgt.7700430