Abstract
Purpose
Colorectal cancer is the third most frequent cancer in industrial nations. Therapeutic strategies to treat metastatic disease and prevent recurrence are needed. Anti-tumor immunity can be induced by dendritic cells. Dendritic cells can be expanded by the fms-like tyrosine kinase 3 ligand (Flt3L) in vivo. The aim of this study was to develop an adenoviral-based immune-gene therapy of colorectal cancer with Flt3L in a BALB/c mouse model.
Methods
A new Flt3L-encoding adenoviral vector (pAdFlt3L) was administered in two approaches in a CT26 colon cancer model in female BALB/c mice. In the therapeutic approach, pAdFlt3L was injected into the tail vein or directly into subcutaneous CT26 colon carcinoma tumors in BALB/c mice. In the vaccination protocol, mice were vaccinated with CT26 cell lysate and pAdFlt3L subcutaneous prior to subcutaneous application of vital CT26 cells.
Results
Application of pAdFlt3L led to high levels of Flt3L in vitro and in vivo. Significant expansion of dendritic cells after application of pAdFlt3L in vivo was confirmed by the use of CD11c and CD11b surface markers in immunohistochemistry and flow cytometry (p = 0.019). In the therapeutic approach, neither intravenous nor intratumoral treatments with pAdFlt3L lead to regression of CT26 tumors. In the vaccination protocol, vaccination completely prevented tumor growth and resulted in superior survival compared to control mice (p < 0.001).
Conclusions
Our results demonstrate that immunostimulatory therapy with pAdFlt3L is effective to prevent tumor development through vaccination and may represent a therapeutic tool to prevent metastatic disease.
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Abbreviations
- BSA:
-
Bovine serum albumin
- CT26 cells:
-
Colon carcinoma cell line
- DC:
-
Dendritic cells
- DMEM:
-
Dulbecco’s modified Eagle medium supplemented with 10 % heat-inactivated fetal bovine serum
- Flt3L:
-
Fms-like tyrosine kinase 3 receptor ligand
- FCS:
-
Heat-inactivated fetal bovine serum
- FITC:
-
Fluorescein isothiocyanate
- FACS:
-
Fluorscence activated cell sorter flow cytometry
- GM-CSF:
-
Granulocyte macrophage colony stimulating factor
- GFP:
-
Green fluorescent protein (GFP)
- HEK-293 cells:
-
Human embryonic kidney cell line
- MOI:
-
Multiplicity of infection
- pAdFlt3L:
-
Replication-deficient adenoviral vector encoding for Flt3L and GFP
- pAdGFP:
-
Replication-deficient adenoviral vector encoding for GFP
- PBS:
-
Phosphate-buffered saline
- RIPA-buffer:
-
50, 150 mM sodiumchloride, 1 % Nonidet p-40, 0.5 % sodiumdeoxycholate, 1 % sodium dodecyl sulfate
- Rpm:
-
Runs per minute
- SDS:
-
Sodium dodecyl sulfate-plyacrylamide
- TBS:
-
Tris-buffered saline
- TBS Tween:
-
TRis-biffered saline Tween
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Acknowledgments
The authors thank Stefan Urban and Anke Lonsdorf for helpful discussion. We also thank Ulrike Protzer for kindly providing pAdGFP and Sabine Tuma and Jasmin Geib for their excellent technical assistance.
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Riediger, C., Wingender, G., Knolle, P. et al. Fms-like tyrosine kinase 3 receptor ligand (Flt3L)-based vaccination administered with an adenoviral vector prevents tumor growth of colorectal cancer in a BALB/c mouse model. J Cancer Res Clin Oncol 139, 2097–2110 (2013). https://doi.org/10.1007/s00432-013-1532-z
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DOI: https://doi.org/10.1007/s00432-013-1532-z