Abstract
Pancreatic carcinoma is relatively resistant to chemotherapy and cell death induced by replication of adenoviruses (Ad) can be one of the therapeutic options. Transduction efficacy of conventional type 5 Ad (Ad5) is however low and the cytotoxic mechanism by replication-competent Ad was not well understood. We constructed replication-competent Ad5 of which the E1A promoter region was replaced with a transcriptional regulatory region of the midkine, the survivin or the cyclooxygenase-2 gene, all of which were expressed at a high level in human tumors. We also prepared replication-competent Ad5 that were activated with the same region but had the type 35 Ad-derived fiber-knob region (AdF35) to convert the major cellular receptor for Ad infection from the coxsackie adenovirus receptor to CD46 molecules. Replication-competent AdF35 that were activated with the exogenous region produced cytotoxic effects on human pancreatic carcinoma cells greater than the corresponding Ad5 bearing with the same regulatory region. Cells infected with the AdF35 showed cytopathic effects and increased sub-G1 fractions. Caspase-9, less significantly caspase-8 and poly (ADP-ribose) polymerase, but not caspase-3 was cleaved and expression of molecules involved in autophagy and caspase-independent cell death pathways remained unchanged. Nevertheless, H2A histone family member X molecules were phosphorylated, and N-acetyl-l-cystein, an inhibitor for reactive oxygen species, suppressed the AdF35-mediated cytotoxicity. These data indicated a novel mechanism of Ad-mediated cell death and suggest a possible clinical application of the fiber-knob modified Ad.
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Abbreviations
- Ad:
-
Adenoviruses
- Sur:
-
Survivin
- MK:
-
Midkine
- COX-2:
-
Cyclooxygenase-2
- Ad5:
-
Type 5 adenoviruses
- CAR:
-
Coxsackie adenovirus receptor
- AdF35:
-
Type 5 adenoviruses bearing type 35-derived fiber-knob region
- ROS:
-
Reactive oxygen species
- CMV:
-
Cytomegalovirus
- GFP:
-
Green fluorescent protein
- Lac:
-
β-galactosidase
- Vp:
-
Virus particles
- MOI:
-
Multiplicity of infection
- NAC:
-
N-acetyl-l-cysteine
- PARP:
-
Poly (ADP-ribose) polymerase
- H2AX:
-
H2A histone family member X
- IC50 :
-
Half maximal inhibitory concentration
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Acknowledgments
This study was supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan, the Grant-in-Aid for Research on seeds for Publicly Essential Drugs and Medical Devices from the Ministry of Health, Labor and Welfare of Japan, and a Grant-in-aid from the Nichias Corporation.
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Yamauchi, S., Kawamura, K., Okamoto, S. et al. Replication-competent adenoviruses with the type 35-derived fiber-knob region achieve reactive oxygen species-dependent cytotoxicity and produce greater toxicity than those with the type 5-derived region in pancreatic carcinoma. Apoptosis 20, 1587–1598 (2015). https://doi.org/10.1007/s10495-015-1171-8
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DOI: https://doi.org/10.1007/s10495-015-1171-8