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Vaccine. 2007 Apr 20;25(16):3018-21. Epub 2007 Jan 19.

Anti-cancer activity of plant-produced HPV16 E7 vaccine.

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  • 1ENEA, Italian National Agency for New Technologies, Energy and the Environment, BAS BIOTEC GEN, C.R. Casaccia, Via Anguillarese 301, 00123 Rome, Italy.

Abstract

The E7 oncoprotein from Human Papilloma Virus (HPV) is an attractive candidate for anti-cancer vaccine development. In this study, we engineered HPV16 E7 coding sequence (wild type or mutagenized sequence, E7GGG) as fusions to beta-1,3-1,4-glucanase (LicKM) of Clostridium thermocellum and produced in Nicotiana benthamiana plants using a transient expression system. Target antigens were purified and evaluated in mice for their potential as prophylactic and therapeutic vaccine candidates. Both fusion proteins induced E7-specific IgG and cytotoxic T-cell responses and protected mice against challenge with E7-expressing tumor cells. Furthermore, when administered after challenge, these plant-produced antigens prevented tumor development.

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