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Eradication of hepatoma and colon cancer in mice with Flt3L gene therapy in combination with 5-FU

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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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Correspondence to Yajun Guo.

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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

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