Inhibition effect of vascular endothelial growth factor antisense oligodeoxynucleotides on C6 glioma

Abstract

Objective: To explore the probability of vascular endothelial growth factor (VEGF) antisense oligodeoxynucleotides as a developing new therapeutic strategy for glioma. Methods: VEGF protein expression was detected by S-P immunohistochemical technique. Tumor cell apoptosis was observed by TUNEL method. Results: Compared with control, VEGF protein expression was inhibited by antisense oligodeoxynucleotides in vitro. And the inhibitory effects increased with the increasing concentration. VEGF positive rate was 82.10% in control group, while in 2.5, 5, 10 µmol/L AODN groups, they were 70.00%, 57.85%, 53.20% respectively. No inhibition effect was found in the cell lines treated with missense and sense oligodeoxynucleotides. In vivo, antisense oligodeoxynucleotides therapy also inhibited VEGF protein expression and induced the increase of apoptotic tumor cells. However, it has no effect on tumor cell proliferation. Conclusion: It is hopeful that VEGF antisense oligodeoxynucleotides may be a new gene therapy method to glioma through its antiangiogenesis effect by inhibition of VEGF.