Improved vaccine protection against retrovirus infection after co-administration of adenoviral vectors encoding viral antigens and type I interferon subtypes

Bayer, Wibke LSF; Lietz, Ruth; Ontikatze, Teona; Johrden, Lena; Tenbusch, Matthias; Nabi, Ghulam; Schimmer, Simone; Groitl, Peter; Wolf, Hans; Berry, Cassandra M.; Überla, Klaus; Dittmer, Ulf LSF; Wildner, Oliver

Background: Type I interferons (IFNs) exhibit direct antiviral effects, but also distinct immunomodulatory properties. In this study, we analyzed type I IFN subtypes for their effect on prophylactic adenovirus-based anti-retroviral vaccination of mice against Friend retrovirus (FV) or HIV.
Results: Mice were vaccinated with adenoviral vectors encoding FV Env and Gag proteins alone or in combination with vectors encoding IFNα1, IFNα2, IFNα4, IFNα5, IFNα6, IFNα9 or IFNβ. Only the co-administration of adenoviral vectors encoding IFNα2, IFNα4, IFNα6 and IFNα9 resulted in strongly improved immune protection of vaccinated mice from subsequent FV challenge infection with high control over FV-induced splenomegaly and reduced viral loads. The level of protection correlated with augmented virus-specific CD4⁺ T cell responses and enhanced antibody titers. Similar results were obtained when mice were vaccinated against HIV with adenoviral vectors encoding HIV Env and Gag-Pol in combination with various type I IFN encoding vectors. Here mainly CD4⁺ T cell responses were enhanced by IFNα subtypes.
Conclusions: Our results indicate that certain IFNα subtypes have the potential to improve the protective effect of adenovirus-based vaccines against retroviruses. This correlated with augmented virus-specific CD4⁺ T cell and antibody responses. Thus, co-expression of select type I IFNs may be a valuable tool for the development of anti-retroviral vaccines.

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Bayer, W., Lietz, R., Ontikatze, T., Johrden, L., Tenbusch, M., Nabi, G., Schimmer, S., Groitl, P., Wolf, H., Berry, C.M., Überla, K., Dittmer, U., Wildner, O., 2018. Improved vaccine protection against retrovirus infection after co-administration of adenoviral vectors encoding viral antigens and type I interferon subtypes. https://doi.org/10.1186/1742-4690-8-75
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