Abstract
We developed a recombinant defective adenovirus with an insert of gene encoding extracellular domain of mouse Flt3L (Ad-mFlt3L) under control of cytomegalovirus promoter to investigate the biological efficacy of Flt3L in combination with chemotherapeutical drug, 5-FU, in eliciting an effective anti-cancer immunity in mouse hepatoma and colon cancer model systems. The constructed Ad-mFlt3L efficiently infected hepatoma and colon cancer cells both in vitro and in vivo, leading to a high production of mFlt3L proteins in association with accumulation of DCs, NK cells and lymphocytes in local tumor tissues. Administration of Ad-mFlt3L can protect bone marrow injury caused by 5-Fu and stimulates proliferation and maturation of lymphocytes, APCs and NKs. Intratumoral injection of Ad-mFlt3L followed by an intraperitoneal administration of 5-Fu significantly inhibited tumor growth and cured established tumors. Adenovirus mediated Flt3L gene therapy synergies with chemotherapeutic drug, 5-Fu, in elicitation of long-lasting antitumor immunity. The tumor specific immunity can be adoptively transferred into naïve animals successfully by transfusion of CD3+CD8+ T cells from the treated mice. The data suggests that adenovirus mediated Flt3L gene therapy in combination with 5-Fu chemotherapy may open a new avenue for development of anti-cancer chemogenetherapy.
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Abbreviations
- Flt3L:
-
Fms-like tyrosine kinase 3 ligand
- NK:
-
Natural killer
- HCC:
-
Hepatocellular carcinoma
- 5-Fu:
-
5-Fluorouracil
- MEM:
-
Minimal essential medium
- Ad-mFL:
-
Adenovirus with an insert of gene encoding extracellular domain of mouse Flt3L
- MTT:
-
3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- FBS:
-
Fetal bovine serum
- CMV:
-
Cytomegalovirus
- EFU:
-
Expression-forming unit
- CFU:
-
Colony-forming unit
- BFU:
-
Burst-forming unit
- MOI:
-
Multiplicity of infection
- IHC:
-
Immunohistochemistry
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Acknowledgments
This work was supported in part by the grants from National Natural Science Foundation of China, Shanghai Commission of Science and Technology, E-Institutes of Shanghai Universities Immunology Division and Ministry of Science and Technology of China (973 and 863 projects) as well as a special grant from Shanghai Pudong Bureau of Science and Technology of China.
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Sheng Hou, Geng Kou, and Xiaoqiang Fan are contribute equally to this paper.
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Hou, S., Kou, G., Fan, X. et al. Eradication of hepatoma and colon cancer in mice with Flt3L gene therapy in combination with 5-FU. Cancer Immunol Immunother 56, 1605–1613 (2007). https://doi.org/10.1007/s00262-007-0306-3
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DOI: https://doi.org/10.1007/s00262-007-0306-3