Intranasal vaccination with a helper-dependent adenoviral vector enhances transgene-specific immune responses in BALB/c mice

Helper-dependent adenoviral (HDAd) vectors were developed primarily for genetic disease therapy by deleting all coding regions for attenuating the host cellular immune response to adenovirus (Ad) and long-lasting gene expression Recently Harur et al. reported that HDAd Vaccine could stimulate superior transgene-specific cytotoxic T lymphocyte (CTL) and antibody responses via the intraperitoneal route. compared to first-generation adenoviral (FGAd) vaccine This prompted LIS to explore the potential of HDAd as a vaccine vector administrated intranasally. In this study. we prepared HDAd and FGAd vectors expressing enhanced green fluorescent protein (EGFP). respectively. and compared then efficacy in mice Mice were immunized intranasally with 5 x 10(9) vp HDAd or FGAd vector particles Despite stimulating similar anti-Ad antibody responses with FGAd vaccine in the prime-boost strategy, HDAd vector expressing EGFP displayed superior transgene-specific serum IgG. mucosal IgA and cellular immune response, with the characterization of balanced or mixed Th1/Th2 CD4+ T-cell responses. Meanwhile, a single dose of intranasal (i.n.) vaccine of HDAd-EGFP Induced a serum IgG response with more efficacy than FGAd-EGFP In addition, i.n boost Immunization enhanced transgene-specific humoral and cellular responses, compared to single i.n. HDAd-EGFP Immunization Our results Suggest that HDAd has potential for a mucosal vaccine vector via i.n. route. which will be useful for the development of vaccines against respiratory viruses. such as respiratory syncytial virus and influenza virus (C) 2009 Elsevier Inc All rights reserved