Abstract
Most patients with advanced breast cancer develop osteolytic bone metastases, which have numerous complications. Because current therapies are not curative, new treatments are needed. Conditionally replicating adenoviruses (CRAds) are anticancer agents designed to infect and lyse tumor cells. However, in spite of their promise as selective cancer therapeutics, replicating adenoviruses have shown limited efficacy in the clinical setting. We hypothesized that a CRAd armed with osteoprotegerin (OPG) would eradicate bone metastases of breast cancer both directly, by oncolysis, and indirectly, by inhibiting osteoclastic bone resorption, and thus reducing the tumor burden. We constructed an armed CRAd (Ad5-Δ24-sOPG-Fc-RGD) by replacing viral E3B genes with a fusion of the ligand-binding domains of OPG and the Fc portion of human IgG1. Conditional replication was conferred by a 24-base pair deletion within E1A (Δ24), which prevents the binding of E1A to the retinoblastoma tumor suppressor/cell cycle regulator protein and limits replication in normal cells. Enhanced infection of cells expressing low levels of the primary Ad5 receptor was conferred by incorporating an arginine-glycine-aspartic acid (RGD) peptide sequence into the fiber knob to mediate binding to αv integrins. After characterization of the armed CRAd, we demonstrated that infection of breast cancer cells by Ad5-Δ24-sOPG-Fc-RGD both killed the infected cells by oncolysis and inhibited the formation of osteoclasts in an in vitro co-culture model. In a murine model of osteolytic bone metastases of breast cancer, the CRAd armed with shortened OPG (sOPG)-Fc reduced tumor burden in the bone and inhibited osteoclast formation more effectively than an unarmed CRAd.
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Acknowledgements
This study was supported by NIH Grants R01 CA108585, T32 CA075930, P30 AR046031, P50 CA089019, DOD Grants DAMD17-03-1-0256 and W81XWH-04-1-0800, Susan G Komen Breast Cancer Foundation Grant BCTR0100406, and Haley's Hope Memorial Support Fund for Osteosarcoma Research at the University of Alabama at Birmingham, USA.
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JT Douglas holds equity in VectorLogics.
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Cody, J., Rivera, A., Lyons, G. et al. Arming a replicating adenovirus with osteoprotegerin reduces the tumor burden in a murine model of osteolytic bone metastases of breast cancer. Cancer Gene Ther 17, 893–905 (2010). https://doi.org/10.1038/cgt.2010.47
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DOI: https://doi.org/10.1038/cgt.2010.47
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