The antitumor efficacy of IL-24 mediated by E1A and E1B triple regulated oncolytic adenovirus

Lian Li Xiao, Yu Mei Wu, Jing Qian, Yuan Tan, Guo Liang Xie, Kang Jian Zhang, Yi Gang Wang, Xiao Yuan Jia, Xin Yuan Liu
Cancer Biology & Therapy 2010 August 1, 10 (3): 242-50

BACKGROUND: IL-24 (interleukin-24) is a promising, multi-functional anti-cancer agent able to selectively induce tumor cell apoptosis while sparing normal cells. Additionally, IL-24 can enhance the immune response to tumors and suppress tumor angiogenesis. In this study, we introduced IL-24 into the oncolytic adenovirus, Ad·sp·E1A((Δ24))·E1B((Δ55))·IL-24. in which E1A was engineered to target Rb (retinoblastoma) deficient or dysfunctional tumors. The survivin promoter (sp), was used to drive expression of IL-24, thereby allowing it to target most tumors. Finally, the 55 KDa gene of E1B was also deleted, thereby preventing replication in normal cells.

RESULTS: Ad·sp·E1A((Δ24))·E1B((Δ55))·IL-24 showed enhanced antitumor effects over the E1, singly regulated oncolytic adenovirus, ONYX-015, in in vitro experiments. Furthermore, Ad·sp·E1A((Δ24))·E1B((Δ55))·IL-24 could effectively inhibit the progression of NCI-H460 lung carcinoma xenografts in nude mice.

METHODS: The antitumor effect of Ad·sp·E1A((Δ24))·E1B((Δ55))·IL-24 was assessed by MTT assay and crystal violet staining in a panel of tumor cells. Cell staining and western blotting for caspase activation were used to assess apoptosis. We assessed the antitumor effects of Ad·sp·E1A((Δ24))·E1B((Δ55))·IL-24 in a xenograft model.

CONCLUSION: This is the first study to use an E1A and E1B triple regulated oncolytic adenovirus vector carrying IL-24 to treat large tumors. We attained efficient antitumor effects both in vitro and in vivo, which provides an experimental foundation for clinical cancer therapy.

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