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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Single oral immunization with replication deficient recombinant adenovirus elicits long-lived transgene-specific cellular and humoral immune responses.

Oral-gastric delivery of vaccines is a preferred route of immunization and is particularly relevant to the development of vaccine-vector systems. We have investigated the ability of a replication deficient (E1-deleted) adenovirus construct (RAd68), which efficiently expresses the measles virus nucleocapsid (N) protein under the control of the strong HCMV IE promoter, to elicit antibody and cytotoxic T cell (CTL) responses in mice following intragastric administration. Measles virus N protein-specific CTL memory and serum antibody responses were analyzed in a total of 140 mice at time points 2-51 weeks after immunization either with a single dose of 10(8) pfu RAd68 or with a fivefold higher dose. Of the 20 animals analyzed in the first 4-week period following low-dose immunization, 6 mounted low-level splenic CTL responses while 13 animals had CTL in the mesenteric lymph nodes. Splenic CTL responses were largely undetectable at later times. Only 23% of low-dose-immunized mice made serum antibody responses and these were generally of low magnitude and frequently of short duration. In contrast, the majority of animals immunized orally with 5 x 10(8) pfu RAd68 mounted splenic CTL responses (70%) and/or antibody responses (89%). Notably, these responses were stronger and of greater duration than those seen following immunization at the lower dose. Gut mucosal immunization with replication deficient adenoviruses is a promising approach, not only for the development of complementary measles vaccine strategies which may be required for measles virus eradication, but also generally for vaccination against other infections.[1]


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