alexa Adenovirus-mediated combined suicide gene and interleukin-2 gene therapy for the treatment of established tumor and induction of antitumor immunity.
Pharmaceutical Sciences

Pharmaceutical Sciences

Journal of Clinical & Experimental Pharmacology

Author(s): Ju DW, Wang BM, Cao X

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Abstract The antitumor effect of the combined transfer of a suicide gene and a cytokine gene was evaluated in the present study. Adenoviruses expressing Escherichia coli cytosine deaminase (AdCD) and adenoviruses expressing murine interleukin-2 (AdIL-2) were utilized for the treatment of established tumors. The mice were inoculated s.c. with FBL-3 erythroleukemia cells and 3 days later received an intratumoral injection of AdCD in the presence or absence of AdIL-2 followed by intraperitoneal 5-fluorocytosine (5-FC) administration. The results demonstrated that tumor-bearing mice treated with AdCD/5-FC in combination with AdIL-2 showed more potent inhibition of tumor growth and survived much longer than did mice treated with AdCD/5-FC, AdIL-2, adenovirus expressing beta-galactosidase/5-FC or phosphate-buffered saline. The tumor mass showed obvious necrosis and inflammatory cell infiltration, and more CD4+ and CD8+ T cells infiltrating the tumor after combined therapy. The splenic natural killer and cytotoxic T lymphocyte activities increased significantly in the mice after combined therapy with AdCD/5-FC/AdIL-2. Our results demonstrate that therapy combining a suicide gene and IL-2 gene can inhibit the growth of established tumors in mice significantly and induce antitumor immunity of the host efficiently.
This article was published in J Cancer Res Clin Oncol and referenced in Journal of Clinical & Experimental Pharmacology

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