Reduction of Immunosupression Induced by Tumor and Improvement of Anti-Tumor Effect of IL-2 through Adinovirus Mediated Antisense VEGF / 中国肿瘤生物治疗杂志

ABSTRACT

Objectives: Use antisense VEGF to reduce the immunosuppression induced by tumor and enhance the antithumor effect of IL-2. Methods: After the MMT45.Li murine liver cancer cells were modified with antisense VEGF alone, or antisense VEGF combined with IL-2 gene, the tumorigenesis of modified MM45T.Li was studied. The apoptosis of cancer cell induced by antisense VEGF and IL-2 gene in vivo was also studied. The tumors were cryosmeared 3 weeks after the mice bearing tumor were treated correspondingly with Ad-antiVEGF or Ad-Il-2 or Ad-antiVEGF/IL-2 or Ad-lacZ, the immunohistochemical analysis of CD4 + , CD8 + was performed.Results: The tumorigenesis of MM45T. Li was reduced by antisense VEGF, and the number of CD4 + , CD8 + cell was increased in tumor tissue, and the immunosupression was also reduced; At the same time antisense VEGF also enhanced the antithumor effect of IL-2 gene.Conclusions: Antisense VEGF not only can inhibit the neovascularization, but also can reduce the immunosupression induced by tumor, and improve lymphocyte infiltration toward tumor site;when it was combined with Il-2,anti VEGF can enhance the antitumor effect greatly.