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Recombinant influenza viruses hold promise as vectors for vaccines to prevent transmission of mucosal pathogens. In this study, we generated a recombinant WSN/TatΔ 51–59  virus in which Tat protein lacking residues 51 to 59 of the basic domain was inserted into the N-terminus of the hemagglutinin (HA) of A/WSN/33 virus. The TatΔ 51–59  insertion into the viral HA caused a 2-log reduction in viral titers in cell culture, compared with the parental A/WSN/33 virus, and severely affected virus replication  in vivo . Nevertheless, Tat-specific antibodies and T cell responses were elicited upon a single intranasal immunization of BALB/c mice with WSN/TatΔ 51–59  virus. Moreover, Tat-specific immune responses were also detected following vaccine administration via the vaginal route. These data provide further evidence that moderately large HIV antigens can be delivered by chimeric HA constructs and elicit specific immune responses, thus increasing the options for the potential use of recombinant influenza viruses, and their derivatives, for prophylactic and therapeutic vaccines.

biomed research international

Induction of Antibodies and T Cell Responses by a Recombinant Influenza Virus Carrying an HIV-1 Tat<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msub><mml:mi mathvariant="bold-italic">Δ</mml:mi><mml:mrow><mml:mtext>51–59</mml:mtext></mml:mrow></mml:msub></mml:mrow></mml:math>Protein in Mice

Induction of Antibodies and T Cell Responses by a Recombinant Influenza Virus Carrying an HIV-1 TatΔ51–59Protein in Mice