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Effective Gene-Viral Therapy for Telomerase-Positive Cancers by Selective Replicative-Competent Adenovirus Combining with Endostatin Gene

¹ Laboratory of Viral and Gene Therapy, Eastern Hepatobiliary Surgery Hospital, Second Military Medical University, Shanghai, China; ² Department of General Surgery, Changhai Hospital, Second Military Medical University, Shanghai, China; ³ Department of Clinical Oncology, University of Hong Kong, Hong Kong, China; and ⁴ Institute of Biochemistry and Cell Biology, Chinese Academy of Sciences, Shanghai, China

Gene-viral therapy, which uses replication-selective transgene-expressing viruses to manage tumors, can exploit the virtues of gene therapy and virotherapy and overcome the limitations of conventional gene therapy. Using a human telomerase reverse transcriptase-targeted replicative adenovirus as an antiangiogenic gene transfer vector to target new angiogenesis and making use of its unrestrained proliferation are completely new concepts in tumor management. CNHK300-mE is a selective replication transgene-expressing adenovirus constructed to carry mouse endostatin gene therapeutically. Infection with CNHK300-mE was associated with selective replication of the adenovirus and production of mouse endostatin in telomerase-positive cancer cells. Endostatin secreted from a human gastric cell line, SGC-7901, infected with CNHK300-mE was significantly higher than that infected with nonreplicative adenovirus Ad-mE in vitro (800 ± 94.7 ng/ml versus 132.9 ± 9.9 ng/ml) and in vivo (610 ± 42 ng/ml versus 126 ± 13 ng/ml). Embryonic chorioallantoic membrane assay showed that the mouse endostatin secreted by CNHK300-mE inhibited angiogenesis efficiently and also induced distortion of pre-existing vasculature. CNHK300-mE exhibited a superior suppression of xenografts in nude mice compared with CNHK300 and Ad-mE. In summary, we provided a more efficient gene-viral therapy strategy by combining oncolysis with antiangiogenesis.

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