Subunit Recombinant Vaccine Protects against Monkeypox

作者：Jean‐Michel Héraud, Yvette Edghill‐Smith, Victor I. Ayala, Irene Kalisz, Janie Parrino, Vaniambadi S. Kalyanaraman, Jody F. Manischewitz, Lisa R. King, Anna Hryniewicz, Christopher Julius Trindade, Meredith Hassett, Wen-Po Tsai, David J. Venzon, Ayşegül Nalça, Monica Vaccari, Peter M. Silvera, Mike Bray, Barney S. Graham, Hana Golding, Jay W. Hooper, Genoveffa Franchini · 发表于：The Journal of Immunology · 年份：2006 · DOI：10.4049/jimmunol.177.4.2552 · 被引用次数：188 · 研究领域：Poxvirus research and outbreaks、Bacillus and Francisella bacterial research、Herpesvirus Infections and Treatments

The smallpox vaccine Dryvax, a live vaccinia virus (VACV), protects against smallpox and monkeypox, but is contraindicated in immunocompromised individuals. Because Abs to VACV mediate protection, a live virus vaccine could be substituted by a safe subunit protein-based vaccine able to induce a protective Ab response. We immunized rhesus macaques with plasmid DNA encoding the monkeypox orthologs of the VACV L1R, A27L, A33R, and B5R proteins by the intradermal and i.m. routes, either alone or in combination with the equivalent recombinant proteins produced in Escherichia coli. Animals that received only DNA failed to produce high titer Abs, developed innumerable skin lesions after challenge, and died in a manner similar to placebo controls. By contrast, the animals vaccinated with proteins developed moderate to severe disease (20-155 skin lesions) but survived. Importantly, those immunized with DNA and boosted with proteins had mild disease with 15 or fewer lesions that resolved within days. DNA/protein immunization elicited Th responses and binding Ab titers to all four proteins that correlated negatively with the total lesion number. The sera of the immunized macaques recognized a limited number of linear B cell epitopes that are highly conserved among orthopoxviruses. Their identification may guide future efforts to develop simpler, safer, and more effective vaccines for monkeypox and smallpox.